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Wyszukujesz frazę "flexural strength" wg kryterium: Temat


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:
Mechanical Properties of Polypropylene Composites with Different Reinforced Natural Fibers – A Comparative Study
Autorzy:
Simamora, Pintor
Simanjuntak, Josua
Sinulingga, Karya
Laksono, Andromeda Dwi
Powiązania:
https://bibliotekanauki.pl/articles/27323811.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
polypropylene
natural fibre
tensile strength
modulus young
flexural strength
Opis:
Developing environmentally friendly and recyclable natural fiber-reinforced polymer composites has recently attracted researchers’ attention and interest. Herein, a comparative study was conducted to compare the mechanical properties of polypropylene (PP) composites with different natural fiber reinforcement, including palm fiber (Arenga pinnata), rice straw (Oryza sativa), coconut husk (Cocos mucifera), old world forked fern leaves (dicranopteris linearis), and snake plant (Sansevieria trifasciata). This study aimed to compare the influence of the five natural fiber materials on the tensile strength and flexural strength of PP composites. The natural fibers were chemically treated with a 5% NaOH solution for 2.5 hours. In the preparation of composites, polypropylene as the matrix is heated to 300 °C and mixed randomly with natural fibers. The test results indicate that the composite with the highest tensile strength (38% higher than the lowest) and flexural strength (102% higher than the lowest) is obtained using the PP composite with reinforced rice straw fiber. In contrast, the PP composites with palm fiber have the lowest tensile strength (72% from the highest tensile strength) and the lowest flexural strength (UFSmin) (62% from the highest flexural strength) corresponds to the PP composites with coconut fiber. This study revealed that the flexural strength of all composite samples was greater than that of pure PP.
Źródło:
Journal of Ecological Engineering; 2023, 24, 7; 311--317
2299-8993
Pojawia się w:
Journal of Ecological 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:
Flexural Properties of Thin Fly Ash Geopolymers at Elevated Temperature
Autorzy:
Ng, Yong-Sing
Liew, Yun Ming
Heah, Cheng Yong
Abdullah, Mohd Mustafa Al Bakri
Ng, Hui-Teng
Chan, Lynette Wei Ling
Powiązania:
https://bibliotekanauki.pl/articles/2134117.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thin geopolymer
fly ash
elevated temperature
flexural strength
Opis:
This paper reports on the flexural properties of thin fly ash geopolymers exposed to elevated temperature. The thin fly ash geopolymers (dimension = 160 mm × 40 mm × 10 mm) were synthesised using 12M NaOH solution mixed with designed solids-to-liquids ratio of 1:2.5 and Na2SiO3/NaOH ratio of 1:4 and underwent heat treatment at different elevated temperature (300°C, 600°C, 900°C and 1150°C) after 28 days of curing. Flexural strength test was accessed to compare the flexural properties while X-Ray Diffraction (XRD) analysis was performed to determine the phase transformation of thin geopolymers at elevated temperature. Results showed that application of heat treatment boosted the flexural properties of thin fly ash geopolymers as the flexural strength increased from 6.5 MPa (room temperature) to 16.2 MPa (1150°C). XRD results showed that the presence of crystalline phases of albite and nepheline contributed to the increment in flexural strength.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 1145--1150
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancing the flexural load capacity of the reinforced concrete simply supported slabs using damaged tires strips (DTS)
Autorzy:
Ali, Saba
Alalikhan, Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/35556446.pdf
Data publikacji:
2022
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
flexural strength
reinforced concrete slabs
damaged tires strips
Opis:
Damaged tires or ended-life tires represent a difficult problem due to their ability to sustain for a long time which are not able to be dissolved easily. Present study focuses on the ability of using the damaged tires strips (DTS) in the field of structural engineering as an innovative reinforcing material used additionally with the main reinforcement. The adopted technique in the present work represents a clean solution to reuse and recycle DTS to increase the ultimate flexural capacity of the reinforced concrete one-way and two-way slabs used in structural systems satisfying clean environment and economic considerations. The tests were conducted upon eight specimens of reinforced concrete one-way slabs (RCOWS) and two specimens of reinforced concrete two-way slabs (RCTWS) reinforced by the DTS as an additional reinforcement. Experimentally obtained results exhibited enhancement for the ultimate flexural load capacity of the RCOWS and RCTWS models reinforced by the DTS in the range of 16–80 and 14.28% respectively, compared to the original reference specimens.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2022, 31, 2; 101-112
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Material Configuration of Fibre-Metal Laminates with Alumina Core on Flexural Strength
Autorzy:
Frankiewicz, Mariusz
Karoluk, Michał
Dziedzic, Robert
Timmel, Tristan
Scholz, Peter
Powiązania:
https://bibliotekanauki.pl/articles/24201172.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
fibre-metal laminates
flexural strength
fatigue
composite materials
Opis:
Fibre metal laminates (FMLs) consisting of layers made of PA6 polyamide prepregs reinforced with glass and carbon fibres and an aluminium alloy core are the new variant of the other types used by aerospace FML materials such as GLARE or CARALL. By using a thermoplastic matrix, they can be shaped by stamping processes, which allows for a more efficient production process than classical laminating methods such as vacuum bagging. In addition to the improved impact energy absorption efficiency, the metallic core can be utilised to effectively bond the composite part to adjacent metallic structures. This article presents the influence of the material configuration of fibre-metal laminates consisting of continuous fibre-reinforced thermoplastic outer layers integrated with a layer of metallic aluminium alloy inserts - a number of layers, type and direction of reinforcing fibres - on the static and fatigue flexural properties. In this study, eight laminate configurations were prepared using a one-step variothermal consolidation process. The results showed that in the three-point flexural fatigue test, the samples exceeded 106 cycles at stresses <30% of the static bending strength. Laminates with predominantly longitudinally reinforced layers showed the highest fatigue strength among the FML samples analysed. The type of reinforcing fibres and the number of layers were less affected on the analysed mechanical properties.
Źródło:
Fatigue of Aircraft Structures; 2022, 14; 18--28
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
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:
Preparation and performance evaluation of jute and glass composites of epoxy resin of (2E,6E)-2,6-bis (4-hydroxy benzylidene)-4-methylcyclohexanone
Autorzy:
Chopda, Jalpa V.
Sankhavara, Dharmesh B.
Patel, Jignesh P.
Parsania, P. H.
Powiązania:
https://bibliotekanauki.pl/articles/1075481.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Composites
Diffusivity
Electric strength
Flexural strength
Photosensitive epoxy resin
Tensile strength
Volume resistivity
Water uptake
Opis:
Jute and glass composites were prepared by compressing molding technique at 150C for 3h under 20 MPa pressure. J-EMBHBC-DDS, J-EMBHBC-THPA, G-EMBHBC-DDS and G-EMBHBC-THPA showed 15, 15.1, 58.3 and 18.7 MPa tensile strength, respectively. J-EMBHBC-DDS and J-EMBHBC-THPA showed 22.9 and 19.4 MPa flexural strength, respectively. J-EMBHBC-DDM and G-EMBHBC-DDM showed 1.6×109 and 1.2×1012 ohm cm volume resistivity, respectively. J-EMBHBC-DDM and G-EMBHBC-DDM showed 2.8 and 11.2 kVmm-1, respectively. Water uptake in the composites was carried out in pure water and 10% each of aqueous HCl, H2SO4, HNO3, NaOH, KOH and NaCl solutions at 35 C as well as in boiling water. Composites showed high water uptake tendency and longer equilibrium time in different environments. High water uptake in the composites is due to presence of hydroxyl groups in celluloses and resins and also due to formation of micro cracks. Nature of the electrolytes also played an important role on water uptake behavior and diffusivity in the composites. Drastic reduction in equilibrium water uptake time was observed in boiling water.
Źródło:
World Scientific News; 2019, 129; 23-39
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation and Reverse Engineering of Eco-Friendly Historical Mortar: Qasr Tuba, Desert Castles in Jordan
Autorzy:
Ghrair, Ayoup M.
Said, Adi J.
Aldaoud, Naela
Miqdadi, Riham
Ahmad, Ahmad A. L.
Powiązania:
https://bibliotekanauki.pl/articles/1839137.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
mortar
grog
lime
gypsum
Qasr Tuba
compressive strength
flexural strength
eco-friendly
historical restoration
Opis:
The purpose of this study was to investigate the mineral composition of the historical mortars of Qasr Tuba and to re-produce them for the restoration process. The mortar samples were collected from the foundation and walls of Qasr Tuba. The chemical and mineral composition of the mortar was determined using several techniques. In addition, the quantitative minerals content was recalculated for the mortar samples utilizing the material balances equation. Moreover, 12 mixtures of mortar were prepared and tested for fresh and hardened properties, according to their respective national and international standards. The results revealed that two types of mortar were used: (i) the lime-based mortar was used for the foundation and joint mortars in the lower parts of the building walls with a gypsum-hydrated lime ratio of 1:3; and (ii) the gypsum-based mortar was used as joint mortar in the upper parts of the building walls for baked bricks at a gypsum-hydrated lime ratio of 4:1. A pozzolanic reaction in the Qasr Tuba mortar produced a new formation of Xonotlite, Stratlingite, and calcium aluminium hydrate as a secondary cementing mineral. In conclusion, the use of hydraulic lime mortar was considered for building an environment for capturing the CO2 gas.
Źródło:
Journal of Ecological Engineering; 2021, 22, 3; 121-134
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Durability of hybrid fiber reinforced concrete at various environmental media
Autorzy:
Elhawary, Eslam Ibrahim Nasr
Elsafoury, Ashraf Hassan
Ahmad, Seleem Saleh Elsayed
Powiązania:
https://bibliotekanauki.pl/articles/35555212.pdf
Data publikacji:
2022
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
durability
hybrid fiber concrete
steel fiber
polypropylene fibre
compressive strength
splitting tensile strength
flexural strength
Opis:
Fiber’s addition to concrete mixture attracts researchers to determine the effect of fiber type on durability properties of hybrid performance concrete. In the present work, steel and polypropylene fibers are used in hybrid form in the experimental program. The objective of this paper is to investigate the mechanical properties of hybrid fiber reinforced concrete subjected to four various media: air, water, sodium chloride, and magnesium sulphate with a 7% concentration. The results showed that using hybrid fibers which consist of 1% steel fiber and 0.3% polypropylene fiber improved the compressive strength, splitting tensile strength, and flexural strength for different media for up to 360 days.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2022, 31, 2; 88-100
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł

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