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Tytuł:
Assessment of Slurry Transport Efficiency after Applying Deflocculant in the Lime Production Process
Autorzy:
Jaworska-Jóźwiak, Beata J.
Powiązania:
https://bibliotekanauki.pl/articles/27324205.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
efficiency
lime production process
deflocculant
friction factor
energy savings
Opis:
The paper presents a method for improving the lime production process by increasing the efficiency of the lime slurry transport that occurs in it. The aim of the study was to reduce the energy demand of the pump installed in the discharge line. The presented solution consists of applying an additive called deflocculant to the transported slurry in order to reduce its viscosity while increasing the concentration of solids content. The deflocculant applied to the slurry is composed of waste material from the lime slaking process and an environmentally neutral chemical substance in the form of sodium-water glass. The rheological studies conducted confirm the positive effect of the selected deflocculant on the properties of the slurry tested. As a result of the analysis, it has been shown that the proposed solution has a substantial effect on reducing the friction factor of the transported slurry, thus reducing the energy consumption in the investigated process.
Źródło:
Management and Production Engineering Review; 2023, 14, 4; 48--55
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved of Mechanical Characteristics of Gargar Mud by Mineral Additives
Autorzy:
Mokhtari, Fouzia B. Z.
Youcefi, Abdelkader
Driss, A.A.E.
Ghrici, Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/27314865.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
Gargar dam
mud
lime
pozzolana
mineral additives
tama Gargar
błoto gargarowe
wapno
pucolana
dodatki mineralne
Opis:
The operational dams in Algeria lose 32 million m 3 of water storage capacity each year, and fifteen of these dams are threatened by siltation. This investigation forms a component of a management strategy for dredged silt in the Gargar Dam, the third-largest dam in Algeria with considerable sedimentation. This paper comprises two main axes: a detailed experimental study based on the studied dam mud's physico-chemical, rheological, and mechanical analysis. The second part is based on the study of the valorization of Gargar mud to be acceptable for use in road civil engineering. In order to obtain this goal, the Gargar mud was treated with lime (0-6%), sand (20%), and natural pozzolana (20%). Test results show that the properties of Gargar mud are significantly improved after treatment, and the soil becomes more friable and more resistant; it can therefore be used as a foundation layer in road civil engineering.
Źródło:
Civil and Environmental Engineering Reports; 2023, 33, 4; 73--94
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kanał Augustowski – niezwykła historia budowli hydrotechnicznej z 1. połowy XIX wieku
The Augustów Canal – the interesting history of a hydro-technological structure dating from the first half of the nineteenth century
Autorzy:
Rymsza, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/21151089.pdf
Data publikacji:
2023
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
Kanał Augustowski
sztuczne wapno hydrauliczne
sztuczne spoiwo hydrauliczne
cement portlandzki
cement augustowski
Augustów Canal
artificial hydraulic lime
artificial hydraulic binding agent
Portland cement
Augustów cement
Opis:
Wprowadzenie przez Królestwo Prus w 1821 roku wysokich ceł za tranzyt polskich towarów przez swoje terytorium, po Wiśle do bałtyckich portów spowodowało powstanie koncepcji budowy śródlądowej drogi wodnej omijającej Prusy. Zadanie wybudowania kanału, nazwanego później Augustowskim, powierzono polskiej armii, natomiast do realizacji został przyjęty projekt techniczny kanału wykonany przez ppłk. Ignacego Prądzyńskiego (1792–1850). Pod jego nadzorem w ciągu niespełna sześciu lat wybudowano kanał – od rozpoczęcia wznoszenia śluz w czerwcu 1825 roku do wstępnego uruchomienia kanału przed wybuchem powstania listopadowego (29 listopada 1830 roku). Budowę śluz nadzorowali polscy oficerowie, których średnia wieku wyniosła 29 lat. Większość z nich odegrała znaczące role w powstaniu. Z pewnością największa rola przypadła projektantowi i kierującemu budową kanału – Ignacemu Prądzyńskiemu, który w stopniu generała był wodzem naczelnym powstania. Kolejnym ważnym budowniczym był por. Feliks Pancer (1798–1851), który do wznoszenia budowli hydrotechnicznych kanału zastosował wykonane według własnej koncepcji sztuczne spoiwo o lepszych właściwościach niż cement portlandzki opatentowany w 1824 roku w Wielkiej Brytanii. Budowa kanału miała wpływ na powstanie polskiej cywilnej kadry inżynierskiej oraz wzmocnienie cywilnej kadry inżynierskiej w Europie. Z budową kanału jest związane powstanie pierwszych ośrodków polskiego przemysłu cementowego i bitumicznego oraz zakładanie osad wiejskich, a także powstanie idei turystyki wodnej. Kanał Augustowski jest wyjątkowo cennym obiektem hydrotechnicznym, zachowanym w niepowtarzalnej technicznej, historycznej i krajobrazowej formie, i jako taki wart jest wpisania na Listę światowego dziedzictwa UNESCO.
The introduction by the Kingdom of Prussia of high customs duties for the transit of Polish goods through its territory, along the Vistula River to the Baltic seaports in 1821 gave rise to the concept of building an inland waterway that would bypass Prussia. The task of building the canal, later called the Augustów Canal, was entrusted to the Polish army, while the technical design of the canal approved for implementation was conceived by Lieutenant Colonel Ignacy Prądzyński (1792–1850). Under his supervision, the canal was built in less than six years – from the start of the construction of the locks in June 1825 to the initial launch of the canal before the outbreak of the November Uprising (29 November 1830). The construction of the locks was supervised by Polish officers, whose average age was 29. Most of them had significant roles in the uprising. Certainly, the designer and supervisor of the canal’s construction, Ignacy Prądzyński, played the key role – in the rank of general, he was commander-in-chief of the uprising. Another important builder was Lieutenant Feliks Pancer (1798–1851), who used an artificial binder made according to his own conception, which had better properties than the Portland cement patented in Britain in 1824, for the construction of the canal’s hydrotechnological structures. The canal’s construction contributed to the emergence of a corps of Polish civil engineers and the strengthening of the civil engineering cadre in Europe. Also associated with the construction of the canal is the appearance of the first centres of the Polish cement industry and bitumen products, the establishment of rural settlements, as well as the emergence of the idea of water tourism. The Augustów Canal is an exceptionally valuable hydro-technological object, preserved in a unique form that embraces its technological aspects as well as its history and landscape, and as such is worthy of being inscribed on the UNESCO World Heritage List.
Źródło:
Ochrona Zabytków; 2023, 1; 255-283
0029-8247
2956-6606
Pojawia się w:
Ochrona Zabytków
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Legal regulations regarding the admission of raw minerals to the market in the form of agents improving soil properties or liming agents
Regulacje prawne w zakresie dopuszczania surowcowych kopalin do obrotu w postaci środków poprawiających właściwości gleb lub środków wapnujących
Autorzy:
Antonkiewicz, Jacek
Skuta, Ireneusz
Pożyczka, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/31342983.pdf
Data publikacji:
2023
Wydawca:
Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:
surowce mineralne
kopaliny
wapno
polepszacz glebowy
regulacje prawne
mineral resources
minerals
lime
soil improver
legal regulations
Opis:
The Act on Fertilizers and Fertilization and the Regulations to the Act allow for the marketing of new fertilizers, developed on the basis of natural minerals, mineral raw materials as well as mineral and organic waste, which meet specific requirements in terms of chemical impurities (e.g. heavy metals – Cr, Cd, Ni, Pb, Hg, As) and biological contaminants (live eggs of intestinal parasites: Ascaris sp., Trichuris sp., Toxocara sp., Salmonella bacteria). Fertilizers agents based on mineral raw materials, e.g. calcium, may be placed on the market, provided that the minimum amount of nutrients is maintained and the limits of heavy metals such as cadmium (Cd) and lead (P b), arsenic (As) are observed. The analysis of the chemical composition should show that mineral raw materials in the form of a fertilizer and liming agent are not a potential source of heavy metals for the soil. Fertilizers agents are safe for the environment and, after a positive opinion issued by IUNG-PIB in Puławy, may lose the status of a waste material. These raw materials can then be placed on the market in the form of a soil improver or liming agent.
Ustawa o nawozach i nawożeniu oraz rozporządzenia do ustawy pozwalają na wprowadzenie do obrotu nowych środków nawozowych, opracowanych na podstawie naturalnych kopalin, surowców mineralnych oraz odpadów mineralnych i organicznych, które spełniają określone wymagania w zakresie zanieczyszczeń chemicznych (np. metale ciężkie – Cr, Cd, Ni, Pb, Hg, As) oraz zanieczyszczeń biologicznych (żywych jaj pasożytów jelitowych: Ascaris sp., Trichuris sp., Toxocara sp., bakterii z rodzaju Salmonella). Środki nawozowe otrzymywane na bazie surowców mineralnych, na przykład o charakterze wapniowym, mogą być wprowadzone do obrotu, pod warunkiem zachowania minimalnej ilości składników pokarmowych oraz przy zachowaniu limitów metali ciężkich i innych pierwiastków potencjalnie toksycznych, takich jak kadmu (Cd) i ołowiu (Pb), czy arsenu (As). Z analizy składu chemicznego powinno wynikać, że surowce mineralne w postaci środka nawozowego, wapnującego, nie stanowią potencjalnego źródła metali ciężkich dla gleby. Środki nawozowe są bezpieczne dla środowiska i po pozytywnej opinii wydanej przez IUNG-PIB w Puławach mogą utracić status materiału odpadowego. Następnie surowce te mogą być wprowadzone do obrotu w postaci środka poprawiającego właściwości gleby lub środka wapnującego.
Źródło:
Górnictwo Odkrywkowe; 2023, 64, 2; 50-56
0043-2075
Pojawia się w:
Górnictwo Odkrywkowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The comparative studies of the properties of joint sealants produced by manufacturers and in laboratory conditions with the use of highly modified bitumen
Badania porównawcze właściwości mas zalewowych wytwarzanych przez producentów i w warunkach laboratoryjnych z wykorzystaniem asfaltu wysokomodyfikowanego
Autorzy:
Stepień, Justyna
Iwański, Mateusz M.
Remišová, Eva
Decký, Martin
Briliak, Dušan
Powiązania:
https://bibliotekanauki.pl/articles/27322566.pdf
Data publikacji:
2023
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
hot-applied joint sealant
highly modified bitumen
expansion joint
hydrated lime
crumb rubber
zalewa szczelin na gorąco
asfalt wysokomodyfikowany
szczelina dylatacyjna
wapno hydratyzowane
odpady gumowe
Opis:
Joint sealants produced on the basis of modified bitumen are an effective mean for protection of expansion joints on bridges and for repair of cracks in various road surfaces. A comparative study was performed to evaluate seven hot-applied joint sealants obtained commercially and three joint sealants produced in laboratory conditions with different contents of highly modified asphalt binder (40 to 100%). The basic properties of the joint sealants and asphalt binders were evaluated, including penetration, softening point, breaking point and elastic recovery. Additionally, Fourier infrared spectroscopy (FTIR) method was used to evaluate the chemical composition of the asphalt binders. The variability of the basic properties of joint sealants was estimated in the range from -77.1% to 43.6% in relation to the base asphalt binder. It has been established that the addition of crumb rubber, hydrated lime and rapeseed oil may be viable in controlling the parameters of the joint sealants.
Zalewy szczelin produkowane na bazie asfaltów modyfikowanych są skutecznym rodzajem zabezpieczenia przerw dylatacyjnych na obiektach mostowych oraz naprawy uszkodzeń różnych typów nawierzchni drogowych. Badaniami porównawczymi objęto siedem mas zalewowych stosowanych na gorąco, wytworzonych przez krajowych i zagranicznych producentów, oraz trzy masy zalewowe wytworzone w warunkach laboratoryjnych o różnej zawartości wysokomodyfikowanego lepiszcza asfaltowego (40 do 100%). Ocenie poddano podstawowe cechy lepiszczy asfaltowych oraz parametry wyprodukowanych na ich bazie mas zalewowych, obejmujące: penetrację w 25°C, temperaturę mięknienia, temperaturę łamliwości Fraassa i nawrót sprężysty. Dodatkowo, do porównania składu chemicznego lepiszczy asfaltowych wykorzystano metodę spektroskopii fourierowskiej w podczerwieni (FTIR). Oszacowano procentowy zakres zmienności podstawowych właściwości mas zalewowych w relacji do bazowego lepiszcza asfaltowego w granicach od -77,1% do 43,6% w relacji do bazowego lepiszcza asfaltowego. Ustalono, że istotnym regulatorem parametrów mas zalewowych mogą być dodatki odpadów gumowych, wapna hydratyzowanego oraz oleju rzepakowego.
Źródło:
Structure and Environment; 2023, 15, 4; 227--243
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The depression mechanism on pyrite in a low-alkaline system with combined depressants : Experiment, HSC, DFT and ToF–SIMS studies
Autorzy:
Li, Suqi
Yuan, Jiaqiao
Ding, Zhan
Li, Jie
Yu, Anmei
Wen, Shuming
Bai, Shaojun
Powiązania:
https://bibliotekanauki.pl/articles/24085821.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
pyrite
calcium hypochlorite
lime
depression
low alkaline system
Opis:
Depression of pyrite in a low-alkaline system has sparked soaring interests for the multi-metal sulfide minerals flotation recently. This study investigates effects of combined depressants (Ca(ClO)2 and CaO) on pyrite flotation with butyl xanthate (KBX). Micro-flotation experiments indicate that the addition of 200 mg/L combined depressants (a mass ratios of CaO to Ca(ClO) 2 of 2:3) and 1.0×10−3 mol/L KBX at pH 9.5 can effectively depresses the flotation of pyrite, and a minimum pyrite recovery rate of 12.5% is obtained. Basic thermodynamic evaluation results confirm the participation of Ca(ClO) 2 significantly decrease the negative Gibbs free energies of pyrite oxidation reaction. Besides, the calcium species (Ca(OH) 2, Ca2+ and Ca(Cl) 2) will spontaneously transform into CaCO3,and it is the ultimate dominant calcium species in the CO32- system. Density functional theory (DFT) results indicate that CaCO3 can chemically adsorb onto the pyrite surface with an adsorption energy of –671.13 kJ/mol. The O1 and Ca atoms mainly contribute to the bonding process and are responsible for the stable adsorption of CaCO3. ToF-SIMS results provide strong evidence that the combined depressants increase the amount of hydrophilic species and decrease dixanthogen adsorption onto the pyrite surface. The thickness of the whole formed hydrophilic species is approximately 50 nm. Semiquantitative amounts of hydrophilic species follow the order of hydroxy calcium>iron carbonyl>calcium carbonate. Overall, hydrophilic species repulse adsorption of dixanthogen and significantly reduce the flotation performance of pyrite.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168454
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrasonic P- and S-Wave Reflection and CPT Soundings for Measuring Shear Strength in Soil Stabilized by Deep Lime/Cement Columns in Stockholm Norvik Port
Autorzy:
Lindh, Per
Lemenkova, Polina
Powiązania:
https://bibliotekanauki.pl/articles/31339810.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
civil engineering
soil stabilization
compressive strength
cement
lime
seismic waves
Opis:
In this research project, the measurements of the ultrasonic P- and S-waves and seismic cone penetration testing (CPT) were applied to identify subsurface conditions and properties of clayey soil stabilized with lime/cement columns in the Stockholm Norvik Port, Sweden. Applied geophysical methods enabled to identify a connection between the resistance of soil and strength in the stabilized columns. The records of the seismic tests were obtained in the laboratory of Swedish Geotechnical Institute (SGI) through estimated P- and S-wave velocities using techniques of resonance frequency measurement of the stabilized specimens. The CPT profiles were used to evaluate the quality of the lime/cement columns of the reinforced soil by the interpretation of signals. The relationship between the P- and S-waves demonstrated a gain in strength during soil hardening. The quality of soil was evaluated by seismic measurements with aim to achieve sufficient strength of foundations prior to the construction of the infrastructure objects and industrial works. Seismic CPT is an effective method essential to evaluate the correct placement of the CPT inside the column. This work demonstrated the alternative seismic methods supporting the up-hole technology of drilling techniques for practical purpose in civil engineering and geotechnical works.
Źródło:
Archives of Acoustics; 2023, 48, 3; 325-346
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wapienie jurajskie ze złóż w rejonie Działoszyna – wykształcenie litologiczne i obecne kierunki wykorzystania
Jurassic limestones from deposits in the Działoszyn region – lithology and directions of applications
Autorzy:
Guzik, Katarzyna
Figarska-Warchoł, Beata
Skuta, Ireneusz
Powiązania:
https://bibliotekanauki.pl/articles/31342971.pdf
Data publikacji:
2023
Wydawca:
Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:
wapienie
górna jura
właściwości
zastosowanie
wapienie zalesiackie
przemysł wapienniczy
przemysł cementowy
limestones
Upper Jurassic
properties
applications
Zalesiaki Limestones
lime industry
cement industry
Opis:
W artykule scharakteryzowano górnojurajskie wapienie ze złóż w rejonie Działoszyna, udokumentowane dla potrzeb przemysłu cementowego, wapienniczego i do produkcji kamienia budowlanego. Przedstawiono najważniejsze parametry chemiczne oraz fizyczne i mechaniczne wapieni z eksploatowanych złóż oraz dane na temat wielkości wydobycia i dostępnych zasobów. Wśród kompleksów skalnych oksfordu, charakteryzujących się zróżnicowanym udziałem wapieni, wapieni marglistych i margli, szczególne znaczenie ma odmiana wapieni zalesiackich. Skały te poddane zostały szczegółowej charakterystyce w zakresie wykształcenia litologicznego, parametrów jakościowych oraz kierunków gospodarczego wykorzystania.
The paper presents the characteristics of the Jurassic limestones from deposits in the Działoszyn area, recognized as a rock minerals for the cement and lime industry and for the production of construction stone. The most important chemical, physical and mechanical parameters of limestone from exploited deposits as well as data on the mining output volume and available resources are presented. Among the Oxford rock complexes, comprises of limestones, marly limestones and marls that occurs in various proportions, the type of Zalesiaki limestones is of particular importance. These rocks were subjected to detailed analyses in terms of variability of lithological features, quality parameters and directions of economic use.
Źródło:
Górnictwo Odkrywkowe; 2023, 64, 2; 57-66
0043-2075
Pojawia się w:
Górnictwo Odkrywkowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An innovative flotation technology for the lime-depressed pyrite recovery from copper sulphide ore via acid mine drainage (AMD) activation
Autorzy:
Yuan, Jiaqiao
Ding, Zhan
Bi, Yunxiao
Li, Jie
Wen, Shuming
Bai, Shaojun
Powiązania:
https://bibliotekanauki.pl/articles/2175438.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
copper sulfide ore
acid mine drainage (AMD)
lime-depressed-pyrite
activator
hydrophilic species
Opis:
In this study, an innovative flotation technology consisted of Cu differential flotation with high alkali lime and pyrite recovery with acid mine drainage (AMD) activation was investigated for the cleaner beneficiation of the copper sulfide ore. Flotation test results showed that H2SO4 -CuSO4 and AMD could effectively activate the pyrite flotation with SBX collector. Moreover, the recovery of S concentrate is increased by 5.33% in the AMD system. Adsorption amount results of SBX collector indicated that the hydrophilic species (Ca2+, CaOH+ and FeOOH) were formed on the pyrite surfaces in the high alkali lime craft (pH=11.3) and degraded the interaction between SBX and pyrite surfaces. AMD can effectively clear off the hydrophilic calcium species and the copper ions originated from the AMD absorb onto the pyrite surfaces, facilitating the SBX collector adsorption. Composition analysis results of tailings water confirmed that the tailing water obtained by the AMD flotation system was more desirable to be recycled in the Cu differential flotation due to its higher pH value (8.7). The present study provides a novel approach for the treatment of AMD, and has the vital practical significance for the emission reduction of AMD and the increase of beneficiation profits.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 152609
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
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:
Effects of Hydrated Lime on Moisture Susceptibility of Asphalt Concrete
Autorzy:
Al-Marafi, Mohammad Nour Ibrahim
Powiązania:
https://bibliotekanauki.pl/articles/2024016.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
indirect tensile strength
modified asphalt mixture
nano hydrated lime
tensile strength ratio
moisture damage
Opis:
Moisture damage is one of the most critical distresses affecting asphalt pavement. The use of mineral fillers such as hydrated lime can increase the moisture resistance of the asphalt mixtures. In this study, the effects of hydrated lime (HL) and nano hydrated lime (NHL) were investigated on the moisture susceptibility of modified asphalt mixtures. The asphalt mixtures were modified using HL and NHL with varying percentages of each additive. The indirect tensile strength (ITS) test was performed to investigate moisture susceptibility. This test was carried out with three types of asphalt mixtures including, normal asphalt mixture without additives, modified asphalt mixture with HL, and modified with NHL. The results showed that the addition of HL and NHL as mineral fillers enhanced the performance of the mixtures against moisture damage. The highest increase in ITS value under dry conditions was observed in the modified mixtures with 20% HL and 20% NHL, and under wet conditions it was observed at 30% HL and 20% NHL. The results also indicated that the addition of 20% HL and 30% NHL increased the value of tensile strength ratio (TSR) by 78.6% and 70.6%, respectively.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 2; 13-17
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of zeolites and hydrated lime on volumetrics and moisture resistance of foamed warm mix asphalt concrete
Autorzy:
Chomicz-Kowalska, Anna
Maciejewski, Krzysztof
Iwański, Mateusz Marek
Janus, Karolina
Powiązania:
https://bibliotekanauki.pl/articles/2173599.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
WMA
foamed bitumen
zeolite
hydrated lime
bitum spieniony
zeolit
wapno hydratyzowane
Opis:
The paper concerns the utilization of hydrated lime and zeolites as additives in warm mix asphalt produced with foamed bitumen. The mentioned additives were added to the mixtures in exchange for specific quantities of mineral filler, which amounted to 0.4% and 1.2% of hydrated lime or 0.4% of water-modified and 1.0% of air-dry zeolites in mineral mix. The study investigated warm-produced mixtures with 4.5% and 4.8% binder content and production and compaction temperatures set at 120⁰C and 100⁰C respectively. Additionally, reference hot and warm mixtures were evaluated. The testing included: air void content, indirect tensile strength in dry state and after one freeze-thaw cycle as well as the resulting resistance to moisture and frost damage index. The mixtures incorporating hydrated lime and lower bitumen content of 4.5% exhibited increased air voids and mostly unchanged mechanical performance when compared to the reference warm mix. Increased bitumen content has resulted in significantly improved performance in moisture resistance and compactability which could be compared to that of the reference hot-produced mixture. On the other hand, the incorporation of zeolites in the foamed bitumen mixtures resulted in all cases in increased air void content in the samples. This has apparently led to decreased indirect tensile strength, in both the dry state and after the freeze-thaw cycle. Based on the results it was concluded that the production temperature of the zeolite-bearing mixtures was too low for the zeolite water to significantly improve the mix’ workability and therefore positively affect its mechanical parameters.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; art. no. e136731
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of zeolites and hydrated lime on volumetrics and moisture resistance of foamed warm mix asphalt concrete
Autorzy:
Chomicz-Kowalska, Anna
Maciejewski, Krzysztof
Iwański, Mateusz Marek
Janus, Karolina
Powiązania:
https://bibliotekanauki.pl/articles/2090731.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
WMA
foamed bitumen
zeolite
hydrated lime
bitum spieniony
zeolit
wapno hydratyzowane
Opis:
The paper concerns the utilization of hydrated lime and zeolites as additives in warm mix asphalt produced with foamed bitumen. The mentioned additives were added to the mixtures in exchange for specific quantities of mineral filler, which amounted to 0.4% and 1.2% of hydrated lime or 0.4% of water-modified and 1.0% of air-dry zeolites in mineral mix. The study investigated warm-produced mixtures with 4.5% and 4.8% binder content and production and compaction temperatures set at 120⁰C and 100⁰C respectively. Additionally, reference hot and warm mixtures were evaluated. The testing included: air void content, indirect tensile strength in dry state and after one freeze-thaw cycle as well as the resulting resistance to moisture and frost damage index. The mixtures incorporating hydrated lime and lower bitumen content of 4.5% exhibited increased air voids and mostly unchanged mechanical performance when compared to the reference warm mix. Increased bitumen content has resulted in significantly improved performance in moisture resistance and compactability which could be compared to that of the reference hot-produced mixture. On the other hand, the incorporation of zeolites in the foamed bitumen mixtures resulted in all cases in increased air void content in the samples. This has apparently led to decreased indirect tensile strength, in both the dry state and after the freeze-thaw cycle. Based on the results it was concluded that the production temperature of the zeolite-bearing mixtures was too low for the zeolite water to significantly improve the mix’ workability and therefore positively affect its mechanical parameters.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136731, 1--9
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evidence of amorphous Ca-phosphate precipitate caused by bio mineralisation in 4-5th CE lime plasters of the previously submerged east coastal monument of Salvankuppam
Autorzy:
Singh, Manager R.
Kumar, S. Vinodh
Ganaraj, Kuntikana
Powiązania:
https://bibliotekanauki.pl/articles/2086560.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
Amorphous Ca-phosphate
16S rRNA
Bio-mineralization
calcite
lime plasters
Opis:
The lime plasters of the excavated monument of Salvankuppam, previously submerged and exposed by the Tsunami occurred in the Indian Ocean on 26th December 2004 was studied with different analytical techniques. The temple is dated 4-5th century CE. The XRF, XRD, FTIR, NMR, SEM-EDX analysis of the lime plasters evidenced particular occurrence of phosphatised bacterial remains in saline conditions. The formation of amorphous Ca-phosphate by bio mineralization was identified in the plasters by the analyses. The plasters are made of air-lime with coarse aggregates and seashells inclusion as confirmed by the thermal and chemical analysis. The microstructure and morphological investigations of mineralized microbial structures by SEM-EDX indicated the formation of amorphous Ca-phosphate. The unordered and fibrous spherulites have hardened and reduced porosity of the plaster by bio mineralization as observed through MIP analysis. The 16S rRNA sequencing has identified the Pseudomonas strains mainly responsible for the clustering of amorphous Ca-phosphate particles around the bacterial colony.
Źródło:
Mineralogia; 2021, 52, 1; 19--30
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy Metals and Metalloids Leachability from Composite Ground Materials Peat – Fly Ash – Lime
Autorzy:
Brzeziński, Bartłomiej
Iskra-Świercz, Dominika
Powiązania:
https://bibliotekanauki.pl/articles/2069894.pdf
Data publikacji:
2021
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
leachability
heavy metals
metalloid
peat
fly ash
hydrated lime
pH value
Opis:
This publication presents the test results of heavy metals and metalloids leachability from ground composite materials. The components of the obtained composites are peat and stabilizing binders in the form of fly ash and hydrated lime. The composites were designed to be used to stabilize low-bearing organic soil in the Lake Druzno basin in the area of Żuławy Elbląskie. The results of the leachability studies show that as the lime hydrated in the composition of the composite increases, the leachability of heavy metals and metalloids decreases. The decrease in the leachability of these elements is also influenced by the increase in the pH value. The results of heavy metals and metalloids leachability from composites as well as the obtained pH values make it possible to conclude that they are neutral to the ground environment and can be used in engineering practice under specific conditions in the area of Żuławy Elbląskie.
Źródło:
Rocznik Ochrona Środowiska; 2021, 23; 513--523
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 154

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