Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "compressive strength" wg kryterium: Temat


Tytuł:
The Effect of Using Naphthalene and Local Soil with Concrete Mixture on Thermal Conductivity, Case of Mafraq City – Jordan
Autorzy:
Alzoubi, Hussain H.
Al-Olaimat, Duha J.
Powiązania:
https://bibliotekanauki.pl/articles/125324.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
naphthalene
thermal conductivity
compressive strength
silica
Opis:
This study explores the effect of direct incorporation of different ratios of naphthalene with soil into the concrete used in Mafraq-Jordan on the thermal conductivity of concrete mixtures. The methodology involved testing 72 concrete cube samples. The basic samples were prepared only from a mixture of water, silica sand, and cement without additives. The additives of local soil and naphthalene of different ratios: 2.5%, 5%, 7%, 10% and 15%, were added to the tested samples. The samples were classified into two groups in terms of size and dimensions; 36 cubes with 5×5×5 cm were tested only for thermal conductivity, and 36 cubes with 3×3×3 cm were tested for compressive strength and thermal conductivity. All samples were tested after 28 days of casting, according to the concrete standards. The results show that adding naphthalene and soil to the cementitious mixtures substantially decreases the thermal conductivity of concrete elements. A reasonable reduction in thermal conductivity was achieved compared with the basic case samples. However, the compressive strength of samples remained within the acceptable values from the stand point of structural engineering. This enhancement in the thermal properties of concrete can be applied in building systems as concrete blocks used in internal and external walls.
Źródło:
Journal of Ecological Engineering; 2019, 20, 4; 42-53
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of the compressive strength of environmentally friendly concrete using artificial neural network
Autorzy:
Kulisz, Monika
Kujawska, Justyna
Aubakirova, Zulfiya
Zhairbaeva, Gulnaz
Warowny, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/38432692.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
ANN
compressive strength
RCA
MLP
RBF
Opis:
The paper evaluated the possibility of using artificial neural network models for predicting the compressive strength (Fc) of concretes with the addition of recycled concrete aggregate (RCA). The artificial neural network (ANN) approaches were used for three variable processes modeling (cement content in the range of 250 to 400 kg/m3, percentage of recycled concrete aggregate from 25% to 100% and the ratios of water contents 0.45 to 0.6). The results indicate that the compressive strength of recycled concrete at 3, 7 and 28 days is strongly influenced by the cement content, %RCA and the ratios of water contents. It is found that the compressive strength at 3, 7 and 28 days decreases when increasing RCA from 25% to 100%. The obtained MLP and RBF networks are characterized by satisfactory capacity for prediction of the compressive strength of concretes with recycled concrete aggregate (RCA) addition. The results in statistical terms; correlation coefficient (R) reveals that the both ANN approaches are powerful tools for the prediction of the compressive strength.
Źródło:
Applied Computer Science; 2022, 18, 4; 68-81
1895-3735
2353-6977
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of incorporating granite powder in the mechanical properties of concrete
Autorzy:
Muñoz Pérez, Socrates Pedro
Atoche Zamora, Jorge Jr.
Powiązania:
https://bibliotekanauki.pl/articles/36061575.pdf
Data publikacji:
2023
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
concrete
granite powder
compressive strength
flexural strength
workability
Opis:
This study analyzes the effects of the incorporation of the granite powder (GP) as a partial replacement of the sand in the concrete in percentages of 10%, 15%, 20% and 30% to carry out a mix design of 210 kg·cm–2. Seeking to find an optimal proportion to increase its mechanical properties where the geotechnical characteristics of the aggregates were identified, workability, temperature, beams and concrete specimens were elaborated. The results of bending and compression tests were compared after 7, 14 and 28 days from setting between the standard concrete and the concrete incorporated with the GP. It is concluded that the optimal result was at 20% GP with 268.6 kg·cm–2, where the compressive strength increases by 13%, while its flexural property rupture modulus of 35 kg·cm–2 and workability are in an optimal range according to the stipulated parameters, thus allowing an important application for this waste in the construction industry, therefore contributing to recycling, environmental quality and the development of the usage of new materials.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2023, 32, 1; 18-33
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lightweight Geopolymer Made of Pumice with Various Aluminum Powder Ratios
Autorzy:
Çetınkaya, S.
Kurt, H.
Kütük, N.
Powiązania:
https://bibliotekanauki.pl/articles/1031665.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
lightweight geopolymers
pumice
compressive strength
aluminum powder
Opis:
In this work, a lightweight geopolymer was prepared using various mass proportions of extra fine aluminum powder and pumice stone that is durable to heat and sound-proof. The effect of NaOH concentration, aluminum mass ratio, the curing temperature and the curing time of the mixture on the compressive strength of the lightweight geopolymers were examined. The concentration of NaOH was found to be 2 M while the mass proportion of Na₂SiO₃/NaOH was found to be 17.5 on the lightweight geopolymers that have the highest compressive strength and the best workability in experiments. The lightweight geopolymer attained the best compressive strength with 1.6 MPa on the 28th day of curing process at 40°C. The mass proportion of aluminum used in the lightweight geopolymer was 2.5% as the density of the lightweight geopolymer obtained was 0.9 g/cm³. Their properties were examined using the Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 544-545
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilization of Slags from Foundry Process
Autorzy:
Pribulová, A.
Futáš, P.
Bartošová, M.
Petrík, J.
Powiązania:
https://bibliotekanauki.pl/articles/106935.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
melting
metallurgical furnace
slag
hydraulicity
compressive strength
Opis:
The melting of steel or cast iron is one step of the foundry process. The foundry industry uses different types of furnaces, and metallurgical slags are products of the pyrometallurgical processes defecting in these furnaces. Furnace slag is a non-metallic by-product that consists primarily of silicates, alumina silicates, and calcium-alumina-silicates. As a by-product of the melting process, furnace slags vary considerably in form depending on the melted metal furnace types, and slag cooling method used. Most quantity of slags from the foundry processes are created in a cupola furnace that is used for cast iron production. An electric arc furnace is usually used for steel production, but it can be used for cast iron production as well. Universal use features an electric induction furnace. Slags from the melting processes in a foundry can be in the form of gravel, or the slag from a cupola furnace can be granulated. The utilization of slags from foundry processes is very delimited in Slovakia because of their quantity. This article deals with the possibility of using foundry slag as a binder in civil engineering. A basic property of a binder in civil engineering is its hydraulicity, which can be given by compression strength. Four metallurgical slags were tested. The values of the compressive strength of the slags were low, but addition cement to the slags resulted in a strong increase in the value of the compressive strength.
Źródło:
Journal of Casting & Materials Engineering; 2017, 1, 4; 103-109
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural, mechanical and pozzolanic characteristics of metakaolin-based geopolymer
Autorzy:
Abiodun, Yetunde Oyebolaji
Sadiq, Obanishola Muftau
Odeosun, Samson Oluropo
Powiązania:
https://bibliotekanauki.pl/articles/184351.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
metakaolin
geopolymer concrete
compressive strength
flexural strength
reinforced concrete
Opis:
The use of cement contributes to global CO2 emission and this leads to the depletion of ozone layer, causing global warming. The quest to reduce or eliminate this problem has resulted in the discovery of metakaolin-based geopolymer as an alternative to the use of cement in construction work. In this study, metakaolin obtained as a result of kaolin calcination from some deposits in Nigeria; Ogun (Imeko), Edo (Okpela), Ondo (Ifon) and Ekiti (Isan-Ekiti) were characterized and used to determine the compressive and flexural strength of metakaolin-based geopolymer concrete (Mk-GPC). Cubes of 150 × 150 × 150 mm were used for the compressive strength test and reinforced concrete beams of size 150 × 250 × 2160 mm were produced to test for flexural strength. A water-absorption test was also carried out on Mk-GPC and the effect of ball-milling was assessed on the strength properties. The results from the various tests showed that 800°C for 1 hour of calcination of kaolin gives best combination of performance properties due to the presence of amorphous silica in metakaolin. Mk-GPC gave higher compressive strength and at an early age than ordinary Portland cement (OPC) concrete. The water absorption capacities of Mk-GPC were higher than the control samples. In the flexural strength test, the reinforced beams failed in flexural-shear mode and the shear capacities at 28-, 56- and 90-day curing age of the beams were between 0.656 and 0.938 MPa for Mk-GPC beams and between 0.563 and 0.844 MPa for the control beams. The moment capacities for the beams were between 19.25 and 33.25 (×10³ kgm²/s²) for Mk-GPC beams and were between 22.75 and 28.0 (×10³ kgm²/s²) for the control beams. The study has revealed that metakaolin-based geopolymer can serve as an alternative to cement for sustainable construction in the Nigerian construction industry.
Źródło:
Geology, Geophysics and Environment; 2020, 46, 1; 57-69
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Analysis of Physical-Mechanical Properties of Natural and Recycled Aggregate Concretes
Autorzy:
Sadowska-Buraczewska, Barbara
Kujawska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/2024050.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
sustainable development
compressive strength
tensile strength
recycled aggregate concrete
Opis:
Research on the use of construction and demolition waste as recycled aggregate for the production of new concrete has confirmed that they are environmentally friendly and constitute an alternative method of waste management. However, contrary to conventional concrete, no large applications of concrete made with recycled concrete have been made and there is still the literature studies of recycled aggregate properties are different, which indicates the need for further research on the properties of cements from waste. This paper presents and compares the results of a laboratory study on the properties of ordinary concrete (BZ), high-strength concrete (BWW), recycled aggregate concrete (REC). The tensile and compressive strength, modulus of elasticity of these concentrates were marked. The research results proved that the compressive strength of the concrete with recycled aggregate, compared with high-performance concrete, is much lower, but only slightly lower than for ordinary concrete. In turn, the tensile strength of the concrete with recycled aggregate is lower than that of high-performance concrete and ordinary concrete. These values, in the case of the compressive strength are as follows: REC – 52MPa; BWW – 68MPa; BZ – 25MPa, whereas for the tensile strength, they reach: REC – 4 MPa, BWW – 6 MPa, BZ – 5.1 MPa. Statistical analysis showed that the given parameters of the analysed concretes are indeed statistically different. Obtained results indicate that recycled aggregate may be aggregate of standard value and good mechanical properties, even better than of ordinary concrete. The application of recycled aggregate is considered to be a new approach in balanced construction and a superb solution to protect the environment.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 2; 18-29
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of liquid-nitrogen freezing of gas-bearing shale rocks on their compressive strength
Autorzy:
Borek, Kinga
Powiązania:
https://bibliotekanauki.pl/articles/127596.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
hydraulic fracturing
black shales
freezing
compressive strength
modelling
Opis:
Any definable relation between falling temperature and the compressive strength of shale rocks should provide a useful predictive tool aiding optimization of the results of hydraulic fracturing. In this research, an automeasuring hydraulic press, a thermo-camera and the Fluent ANSYS software were used. The results of laboratory simulations, and the effects of experiments conducted on shale rocks to determine permanent changes in compressive strength, are presented. As both frozen rocks and rocks returned to room temperature show diminished compressive strength. It is suggested that prior freezing of rocks can increase the efficiency of fracturing.
Źródło:
Mineralogia; 2018, 49, 1/4; 7-16
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concentric Vs. Eccentric Loading on Different Shapes of CFST Columns: A Theoretical Investigation on Axial Compressive Strength According to AISC Guidelines
Autorzy:
Rubieyat, Bin Ali
Islam, Md. Mofizul
Powiązania:
https://bibliotekanauki.pl/articles/1177805.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Confinement effect
bearing capacity and axial compressive strength
Opis:
The Steel-concrete composite column can be an effective solution for any type of civil engineering construction instead of bare concrete or bare steel column because of having a good confinement effect between steel and concrete. Four types of shapes (square, rectangular, circular and elliptical) are chosen to find out their bearing capacity and axial compressive strength according to AISC (2010) guidelines. It is tried to make differences between these shapes. And it is also tried to keep the same cross-sectional dimension in the area of each shape. The main features which are found from this investigation are that circular shape has a good confinement effect and cost-effective than other shapes. Though the capacity of the square shape of CFST column is better than circular but it loses its confinement effect because of having sharp edges. And a square type of shape is suitable for easy connection. On the other hand, rectangular shape is better than elliptical shape.
Źródło:
World Scientific News; 2018, 99; 119-132
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency comparison of mixture formulations in the stabilisation/solidification of the loess silt contaminated with zinc in terms of mechanical properties
Autorzy:
Lal, Agnieszka
Fronczyk, Joanna
Franus, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/27314384.pdf
Data publikacji:
2023
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
loess silt
alternative binder
activator
unconfined compressive strength
Opis:
The effectiveness of various types of binders in stabilizing/solidifying (S/S) contaminated soils is strongly dependent on the type of soil and contaminants present. The literature abounds with studies of stabilisation/solidification of clayey soils, which provides a background for initial assumptions in design of the method application for contamination of this type of soil. However, studies on the stabilisation/solidification of loess silt contaminated with heavy metals are not available. Filling this deficiency is important in order to ensure the rapid adoption of the most effective remedies in case of contamination and their immediate implementation in the subsoil. This paper has enabled the determination of the most effective mixture among the examined for the remediation of loess silt contaminated with zinc in terms of compressive strength. Strengths were determined with the implementation of 30% Portland cement (2.63 MPa), 30% of fly ash-cement mixture (2.21 MPa), an incinerated sewage sludge ash-cement mixture (0.93 MPa) and mixtures in which cement was replaced by an MgO activator (0.18 MPa for fly ash and 0.63 MPa for incinerated sewage sludge ash). In addition, the determination of strength was carried out for samples containing a mixture of fly ash, activator and cement (0.26 MPa) and incinerated sewage sludge ash, activator and cement (0.26 MPa), with weight ratios of 5:4:1 respectively. In summary, fly ash and cement in a 2:1 ratio can be considered the most effective binding mix in terms of unconfined compressive strength increase.
Źródło:
Budownictwo i Architektura; 2023, 22, 1; 25--35
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of thermoplastic waste from production on the strength of cement mortars
Autorzy:
Pietrzak, Alina
Powiązania:
https://bibliotekanauki.pl/articles/29521074.pdf
Data publikacji:
2023
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
cement mortar
thermoplastic wastes
flexural strength
compressive strength
polymer waste
Opis:
This paper presents study results on the effect of the addition of polymeric waste on selected mechanical properties (flexural and compressive strength) of cementitious composites with a special emphasis on cement mortars. This research focuses on cement mortars, commonly used in construction applications such as seaports and quays. Here, post-production waste from the production of automobile floor mats is ground to a fraction of 0–2 mm and used in the amounts of 5%, 7.5%, and 10% by weight of cement as an additive or substitute for sand. All the presented tests are conducted in accordance with PN-EN 197-1. The purpose of these tests is to determine the possibility of using thermoplastic waste as an aggregate substitute or additive in cement mortars. The conducted research confirmed the possibility of using the mentioned waste in cement mortar production technology in the amount of 5% as a substitute for sand.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2023, 75 (147); 42-48
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of microfillers in shaping the sulphur concrete performance
Autorzy:
Ciak, N.
Jankowski, D.
Ciak, M. J.
Powiązania:
https://bibliotekanauki.pl/articles/298290.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
sulphur concrete
fly ash
microsilica
zeolite
compressive strength
tensile strength
abrasion
Opis:
The article presents the research results of sulphur concrete - the material that is created at high temperature as a mixture of a sulphur binder with aggregate and microfillers. While it has very interesting properties, it is not as appreciated as it should be. The aim of this paper is also to encourage a deeper insight into the presented material, and the use of its hidden potential. Sulphur concrete is not new a product of modern technology - it has been known for decades, but new applications are still being found. The paper focuses mostly on the impact of the microfillers used on some properties of the concrete. In the research, the microfillers used were: fly ash, microsilica and zeolite. The article presents the microfillers’ influence on the growing kinetics of compressive and flexural strength and the effects of abrasion on the sulphur concrete. The lab tests were carried out after 3, 7 and 28 days. The most noticeable was the positive influence of the fly ash on concrete performance. The microfillers that influenced the material’s microstructure were also presented.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2015, 18(3); 171-178
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on the workability and compressive strength of concrete by using bagasse ash from sugar mill
Autorzy:
Safayat, Mahmud
Islam, Md. Imamul
Rubieyat, Bin Ali
Islam, Md. Mofizul
Hasan, Md. Mahadi
Powiązania:
https://bibliotekanauki.pl/articles/1178003.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Sugarcane bagasse ash (SCBA)
pozzolanic material and compressive strength
Opis:
The materials which are useless and unwanted is called waste product and this waste product is a burden and harmful to the environment. Sugarcane bagasse ash (SCBA) is one kind of waste which can be termed as the residue left over from burning sugar cane bagasse. The utilization of this waste may be very economical and can also solve the environmental problem. Silica and alumina are the main element of SCBA which is used as a pozzolanic material. This recycling procedure of SCBA reduces environmental pollution and this is also considered the cost-effective material. In this paper, SCBA replaces the cement as a weight of 5%, 10% and 15% which is considered. After completing the compressive strength test, the result shows that the compressive strength increases when 5% cement is replaced by sugarcane bagasse ash and this is the correct replacement of cement.
Źródło:
World Scientific News; 2018, 96; 191-201
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Świadectwo identyczności dostawy betonu - paszportem, wystawionym przez wykonawcę robót budowlanych
Evidence of identity issued by contractor - as passport of concrete delivery to construction site
Autorzy:
Kohutek, Z. B.
Powiązania:
https://bibliotekanauki.pl/articles/348997.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
beton
wytrzymałość na ściskanie
identyczność
concrete
compressive strength
identity
Opis:
W niniejszym artykule po raz pierwszy - poza normą - użyto sformułowania "identyczność" w odniesieniu do dostawy betonu. Uzasadniono celowość oceny identyczności. Omówiono zakres, procedury oraz kryteria. Kryterium dla uśrednienia rozbudowano korzystając z rozwiązania niemieckiego. Podano przykład liczbowy testu identyczności dostawy betonu, wytworzonego pod zakładową kontrolą produkcji - z certyfikatem i bez certyfikatu zewnętrznej jednostki notyfikowanej. Bazą są wyniki badania wytrzymałości na ściskanie. Wg normy EN 206-1 - ocenę zgodności prowadzi producent betonu [7, 8], zaś ocenę identyczności - wykonawca robót budowlanych, dla którego jest ona wiążąca. Ocenę identyczności można traktować jako niezależne uzupełnienie oceny zgodności.
In this article the notion of "identity" has been used for first time in relation to delivery of concrete (except for having used this notion in the norm). Advisability of the assessement of identity has been motivated. The criterion of average have been broadened basing on German solution. The article includes also numerical example of the identity test of delivery of concrete made under production control - with and without certificate of notification body. The base constitute the results of compressive strength inquiry. According to EN 206-1 norm - evaluation of conformity is realized by the concrete producer, and the evaluation of identity - by the contractor; this evaluation is binding on him. The evaluation of identity can be treated as an autonomous supplement of evaluation of conformity.
Źródło:
Górnictwo i Geoinżynieria; 2010, 34, 2; 381-388
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Bioceramics Reinforced Aluminium Matrix Composites
Autorzy:
Bhuvaneswari, V.
Rajeshkumar, L.
Saravanakumar, R.
Balaji, D.
Powiązania:
https://bibliotekanauki.pl/articles/2174579.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal matrix composites
bioceramics
hardness
compressive strength
wear rate
Opis:
Current work attempts to fabricate aluminium alloy AA2219 metal matrix composite (AMC) reinforced with natural bio-based sea shell powder (SSP) which is a ceramic material, in view of improving the mechanical and tribological properties. SSP was characterized by X-Ray Diffraction (XRD) to assess its chemical constituents and particle size. Stir casting route was adopted for fabricating AMCs reinforced with 1, 2 and 3 wt.% of SSP. Energy Dispersive X-ray Spectroscopy (EDS) was used to analyse the formation of secondary elements during casting and scanning electron microscopy (SEM) was used analyze the surface morphology of the composite specimen before and after tribological tests. Hardness, Compressive strength and tribological properties were evaluated using appropriate tests and corresponding ASTM standards. Characterization methods revealed that the formation of secondary elements was very low at 3 wt.% of SSP when compared with other compositions. Hardness and compressive strength was found to be maximum for 3 wt.% of SSP while the specific wear rate and coefficient of friction values were found to be lesser for the same composite when compared with the unreinforced alloy and were on par with the AA2219 composites containing synthetic reinforcements.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1217--1226
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Rice Husk Ash as Partial Replacement of Cement in Sandcrete Blocks
Autorzy:
Wajid, Khan
Fahim, Muhammad
Zaman, Saeed
Khan, Sajjad Wali
Badrashi, Yasir Irfan
Khan, Fayaz
Powiązania:
https://bibliotekanauki.pl/articles/2023978.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
compressive strength
Rise husk ash
sandcrete blocks
masonry unit
pozzolanic
Opis:
This paper presents the outcome of a research study aimed at the performance evaluation of rice husk ash as partial replacement of cement in sandcrete blocks used as masonry units. Rice husk from rice cultivated in the North of Pakistan was used in the study. It was first combusted in a locally manufactured incinerator to convert it into rice husk ash (RHA) and then finely ground to powder form for use with cement. Blocks of size 305 mm×203 mm×152 mm were molded with 0, 10, 30, 40 and 50 % replacement of cement with RHA to find compressive strength at 3, 7, 14 and 28 days age of curing. The results showed that water requirement for the required workability of the sandcrete increased with increase in RHA content whereas compressive strength decreased with increase in RHA content. However, the comparison of compressive strengths of RHA sandcrete blocks with the strength of commercial concrete blocks available in the market and used as masonry units in Pakistan showed that sandcrete blocks having sand to binder ratio of 1:8 and using up to 40% of RHA as replacement of cement gave larger compressive strength than that of commercial concrete blocks and only marginally lower strength for 50% replacement.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 2; 101-107
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelirovanie dinamiki izmenenia energeticeskogo potenciala pod vlianiem tehnologiceskih faktorov
Autorzy:
Bobko, T.
Powiązania:
https://bibliotekanauki.pl/articles/2068407.pdf
Data publikacji:
2009
Wydawca:
Politechnika Częstochowska
Tematy:
beton
wytrzymałość na ściskanie
mrozoodporność
concrete
compressive strength
frost resistance
Opis:
V nastoasej stat'e rassmatrivaetsa metod modelirovania vzaimosvazi mezdu osnovnymi faktorami, vliausimi na nabor procnosti betona pri ponizennyh i otricatel'nih temperaturah naruznogo vozduha.
W niniejszym opracowaniu omówiono metodę i algorytm modelowania współzależności pomiędzy głównymi czynnikami procesu uzyskania przez beton wytrzymałości na ściskanie, zapewniającej odporność mrozową w temperaturach obniżonych i zimowych za pomocą ciepła uwodnienia cementu.
Źródło:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2009, 15 (165); 97-106
0860-7214
Pojawia się w:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural basis of compressive extension and shearing mechanisms in the Carpathian flysch rocks
Strukturalne uwarunkowania mechanizmów rozciągania i ścinania w skałach fliszu karpackiego
Autorzy:
Pinińska, J.
Powiązania:
https://bibliotekanauki.pl/articles/282057.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
rocks
structure
macrofractures
microfractures
deformation curve
acoustic emission
compressive strength
Opis:
According to uniaxial compression tests, variable fracturing, i.e. intragranular, intergranular or transgranular is strictly related to mineral composition and fabric of a rock. Basing on their analysis, deformation characteristics as well as the course of acoustic emission, it is possible to assess whether the resulting defects are caused by processes of extension, shearing or both of them.
W skałach fliszu karpackiego poddanych procesowi jednoosiowego ściskania obserwowano zróżnicowane procesy pękania intragranularnego, intergranularnego i transgranularnego. Mechanizmy tych procesów były ściśle zależne od składu mineralnego, struktury i uziarnienia badanej skały. Interpretacji tych powiązań dokonano na podstawie charakterystyk przebiegu ścieżki deformacji, przebiegów emisji akustycznej oraz analizy mikroskopowej spękań w każdej z próbek badawczych. Rezultatem badań jest rozpoznanie czy powstający pod obciążeniem defekt jest wywołany procesem rozciągania, ścinania czy obu tych procesów.
Źródło:
Journal of Theoretical and Applied Mechanics; 2004, 42, 2; 315-323
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of sub-zero temperature and initial set time on the properties of hardened concrete
Wpływ temperatury ujemnej i czasu wstępnego dojrzewania na właściwości stwardniałego betonu
Autorzy:
Kotwa, A.
Powiązania:
https://bibliotekanauki.pl/articles/402424.pdf
Data publikacji:
2011
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
odporność na ściskanie
temperatury ujemne
compressive strength
sub-zero temperature
Opis:
This study covered the issues of concreting in low temperatures. The analysis concerned the effect of gradual cooling of fresh concrete on compressive strength drops after 28 days of maturing. The investigations were conducted for specimens of class C20/25 concrete prepared from cements: CEM I 32.5R, CEM I 42.5R, CEM II/B-V 42.5R and dolomite aggregate. The linear relationship between the concrete volume gain and strength drop was determined.
Źródło:
Structure and Environment; 2011, 3, 2; 11-17
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Salt and precipitating agent effect on the specific surface area and compressive strength of alumina catalyst support
Autorzy:
Mahmoudian, M.
Hemmati, A.
Hashemabadi, H.
Ghaemi, A.
Shahhosseini, S.
Powiązania:
https://bibliotekanauki.pl/articles/778022.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Alumina
Catalyst Support
Sol Gel
Specific Surface Area
compressive strength
Opis:
Nowadays, catalyst supports are extensively used to decrease the costs and increase the contact surface area in chemical reactions. Specific surface area, compressive strength, pore volume and pore size are some of the most important characteristics of a catalyst support. In this work, Sol-gel and peptization methods were applied to produce alumina catalyst support. Also the roles of aluminum salts and precipitating agents on the specific surface area and compressive strength of alumina catalyst support were investigated. In addition, various additives and common methods in the increasing surface area, compressive strength and adjusting the porosity and pore size are used in this study. The results show that using caustic soda as precipitating agent and aluminum chloride salt yields catalyst supports with the best compressive strength. Also, using aluminum nitrate and ammonia as precipitating agent produced alumina catalyst support with the highest specific surface area.
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 3; 35-40
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural jute laminate for the improvement of strength properties of concrete specimen
Autorzy:
Zulfikar, Achmad Jusuf
Yaakob, Mohd Yuhazri
Umarfaruq, Hel Mee
Syah, Rahmad
Powiązania:
https://bibliotekanauki.pl/articles/38912467.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
natural fiber composite
jute fabric
compressive strength
splitting tensile strength
vacuum bagging.
Opis:
In the last decade, the exploration and investigation of natural ingredients as alternative materials for metal substitutes have been continuously conducted to produce eco-friendly products with sufficiently good strength. The climate and geography of countries like Indonesia provide that such materials are available abundantly and can be easily replanted. Thus, these materials have considerable potential for application in various products. The purpose of this study is to analyze the compressive and tensile strength of a cylindrical column concrete structure reinforced externally with laminate composite materials derived from jute fabric sheets. The specimen manufacturing method uses a vacuum bagging technique with the specimen size specified in the ASTM C39 test standard. After manufacturing, the specimens underwent the treatment of immersion in clean water for 28 days, followed by drying at room temperature for additional 28 days. The column concrete specimens were wrapped with laminate composite materials with variations in several layers of jute fabric. Compressive strength and splitting tensile tests were conducted according to ASTM C39 and ASTM C496 test standards, respectively. The test results showed that applying laminate composite sheaths on the outer surface of the column concrete structure resulted in an increase in strength of up to 100% for both compressive strength and splitting tensile strength. The magnitude of such an increase in strength is reported in this article.
Źródło:
Engineering Transactions; 2023, 71, 4; 507-518
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obtaining lightweight concrete using colemanite waste and acidic pumice
Autorzy:
Erdogan, Y.
Yasari, E.
Gamage Ranjith, P.
Powiązania:
https://bibliotekanauki.pl/articles/109990.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
lightweight concrete
colemanite waste
acidic pumice
density
uniaxial compressive strength
Opis:
This paper presents some results of ongoing laboratory work to design a lightweight concrete using colemanite waste and pumice. Hisarcik and Espey colemanite wastes, acidic pumice aggregate as well as normal Portland cement were used to produce lightweight concrete with economic and environmental advantages. Two different groups and twenty different prescriptions were tried to produce lightweight concrete. The effect of colemanite waste on workability and strength of lightweight concrete were analysed by fresh and hardened concrete tests. The properties of materials examined include slump, air content, density and uniaxial compressive strength of the mortar. The results obtained were compared with control concrete properties and Turkish standard values. The examined tests results showed that lightweight concrete can be produced by the use of acidic pumice aggregate and colemanite waste. Furthermore, the colemanite waste can be used as cement additives and can reduce the cost and environmental pollution with using natural stone aggregate.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 35-43
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation the Effect of Adding Oil Shale Ash on the Compressive Strength of Concrete
Autorzy:
Gougazeh, Mousa
Powiązania:
https://bibliotekanauki.pl/articles/2201819.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
oil shale ash
compressive strength
compaction pressure
combustion
construction
sustainable
Opis:
In the present study, the effect of cementing properties of oil shale ash on the compressive strength of the concrete mixtures produced from oil shale ash, cement, sand, and water was investigated. The used shale ash was produced by direct combustion at 830oC in a laboratory muffle furnace of the El-Lajjun oil shale. Based on the chemical composition of shale ash (OSA), it was concluded that this material consists of a high percentage of CaO which forms the properties of cement materials as well as the contents of SiO2, Al2O3, and Fe2O3 form the properties of pozzolanic materials. Oil shale ash (OSA) materials have diverse applications as alternative materials for the construction industry and construction technology to reduce environmental risks and achieve sustainability. The results showed that the pressed specimen with 40 wt. % OSA content, 50 wt. % sand content and 30% MW obtained the highest compressive strength of about 9.1 MPa after 28 days of hardening. The highest value of 28 days compressive strength for a compacted specimen containing 35 wt. % OSA and 35% MW were achieved with 12 MPa at a compaction pressure of between 25 and 30 MPa. High compressive strength values were found to be achieved in the compressed specimens by controlling mixing water. It is also indicated that the compressive strength increases as OSA content in the compressed specimen increases and increases as compaction pressure increases.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 4; 130--137
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hemp Shive-Based Bio-Composites Bounded by Potato Starch Binder: The Roles of Aggregate Particle Size and Aspect Ratio
Autorzy:
Pundiene, Ina
Vitola, Laura
Pranckeviciene, Jolanta
Bajare, Diana
Powiązania:
https://bibliotekanauki.pl/articles/2027828.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
potato starch binder
hemp shives
biocomposite
compressive strength
thermal conductivity
Opis:
According to European regulations, the construction industry supports and strives to save non-renewable natural resources, increases the share of reusable resources in production and attempts to use renewable natural resources as much as possible by creating alternative building materials, such as bio-composites. Various building materials containing hemp shives (HS) are relatively popular and are often used in practice. The properties of these materials vary widely due to the usage of significantly different binders and because the parameters of the HS can significantly affect the properties of the bio-composite. Potato starch (PS), the properties of which have not been studied extensively in the past, was used as a binder in this study. Depending on the type of manufacturing process and technology employed for hemp fibre production, the HS particle shape and size can vary widely, which leads to the following statement: the properties of bio-composites produced by using the same method, but with different HS, may differ significantly. In order to investigate the effects of HS on the properties of bio-composites, including the hydro-thermal properties, an in-depth study was conducted to examine the structure, the physical properties and the particle size of HS. It was discovered that in order to obtain a material of higher compressive strength, the HS with smaller dimensions should be used; however, if enhanced thermal properties are required, the HS with longer particles should be used.
Źródło:
Journal of Ecological Engineering; 2022, 23, 2; 220-234
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of ground waste glass addition on concrete prepared with their participation properties
Autorzy:
Jeleniewicz, Katarzyna
Rutkowska, Gabriela
Żółtowski, Mariusz
Kula, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/29521052.pdf
Data publikacji:
2023
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
sustainable development
glass waste
concrete
properties
frost resistance
compressive strength
Opis:
Caring for the environment, in accordance with the principles of sustainable development, as well as the increase in the standard of living of society, introduces the need to conduct proper waste management. Construction is an industry with great potential for the management of glass waste as part of material recycling. The construction sector is characterized by high material consumption, with a limited amount of natural resources, meaning that research is constantly being performed on the possibility of replacing them with other common ingredients. A feature of the building materials industry is also the pursuit of continuous improvement of the properties of manufactured materials. The paper presents the research results on the impact of the partial replacement of Portland cement and aggregate with glass waste on strength parameters and frost resistance. For the purpose of experimental work, a concrete mix based on the C20/25 standard concrete with CEM I 42.5R Portland cement, in which from 0 to 20% of the cement or aggregate weight is replaced with glass waste (i.e., glass flour and glass cullet), is designed. In the test range, the glass flour slightly affected the deterioration of the compressive strength, while the glass cullet had no effect on the compressive strength after 56 days of maturation. Moreover, the addition of glass flour increases the bending strength, while the addition of glass cullet maintains a comparable bending strength compared to the reference concrete. The obtained concretes are frost-resistant concrete F150.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2023, 73 (145); 46-53
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies