Опубликована: Янв. 1, 2025
Язык: Английский
Journal of Cleaner Production, Год журнала: 2023, Номер 419, С. 138205 - 138205
Опубликована: Июль 21, 2023
The decomposition of organic waste going to landfills produces methane gas, which is 21 times worse than CO2 in its global warming potential. Spent coffee grounds (SCG) are one type that makes up a significant proportion the landfills. Therefore, it becomes imperative look for recycling solution transform this into valuable resource. concrete industry has potential contribute significantly increasing rate material. However, due high content, unsuitable be used directly structural concrete. experimental project looks at pyrolysing different temperatures (350 and 500 °C) identify suitability improving physicochemical mechanical properties raw pyrolysed forms SCG were as replacement fine aggregates (FA; sand) 5, 10, 15 20% volume levels. X-ray fluorescence (XRF), Carbon, Hydrogen, Nitrogen, Sulfur (CHNS) analysis, laser diffraction particle size (XRD), scanning electron microscopy (SEM) compressive strength tests undertaken investigate material their performance blended composites. results show leaching compounds from hinders hydration reaction cement particles, thereby hampering SCG-blended 350 °C led improvement properties, resulted 29.3% enhancement composite with biochar.
Язык: Английский
Процитировано
48
Journal of Sustainable Cement-Based Materials, Год журнала: 2024, Номер 13(6), С. 865 - 887
Опубликована: Апрель 1, 2024
This research introduces an innovative approach to developing carbon-negative Ultra-High-Performance fiber-reinforced Concrete (UHPC) by incorporating substantial quantities of biochar, both as a binder and aggregate, replacing up 25% weight Ordinary Portland Cement (OPC) quartz sand (QS). The study examines the impact biochar on cement hydration processes, microstructure evolution, various other performance metrics in modified UHPC. Samples were formulated with 3% double-hooked steel fibers ranging from 5 substitutes for OPC QS. investigation included assessments changes rheological properties, strength metrics, long-term shrinkage, resistance sulfate attacks, freeze-thaw durability, analysis, cost-benefit evaluation. Test results indicated that biochar-incorporated samples exhibited 20% increase heat evolution end seventh day plastic energy at 28 days rose 32.14% compared control biochar-augmented versions. Shrinkage reduction varied between 58 69% 210 biochar. Specifically, mix containing (G2-M5-BC-20) significantly improved 90-day compressive flexural 8.9 9.3%, 30.6 36.8%, respectively, while further inclusion showed no marked enhancement metrics. G2-M5-BC-20 also demonstrated excellent attacks cycles, exhibiting least mass loss highest residual strength. An initial revealed biochar-enhanced UHPC could offer compelling financial benefits. Given its mechanical behavior, potential harmful CO2 emissions, economic viability, emerged most promising formulation, potentially generating overall profit $36 per cubic meter.
Язык: Английский
Процитировано
10
Materials Circular Economy, Год журнала: 2025, Номер 7(1)
Опубликована: Янв. 21, 2025
Язык: Английский
Процитировано
1
Results in Engineering, Год журнала: 2025, Номер unknown, С. 104613 - 104613
Опубликована: Март 1, 2025
Язык: Английский
Процитировано
1
Emergent Materials, Год журнала: 2025, Номер unknown
Опубликована: Март 27, 2025
Язык: Английский
Процитировано
1
Industrial Crops and Products, Год журнала: 2023, Номер 204, С. 117335 - 117335
Опубликована: Авг. 24, 2023
Язык: Английский
Процитировано
20
Construction and Building Materials, Год журнала: 2023, Номер 408, С. 133658 - 133658
Опубликована: Окт. 6, 2023
An all-encompassing effort has been performed to utilize waste tire rubber particles for replacing binders and conventional aggregates in concrete, very little work found the current literature on structural lightweight concrete (SLWC) complete replacement of traditional by rubber. Notably, there is no available study addressing microstructure, thermal performance, carbonation resistance SLWC with 100 % coarser content. Therefore, this investigated conductivity, carbonation, X-ray CT scan, extensive microstructural properties novel substitute aggregate first time. Different variables, such as large smaller particles, normal compressed samples, steel fibers, were introduced. Maximum compressive strength 18 MPa a density 2115 kg/m3 satisfied prerequisite prescribed ACI 213R. Non-destructive tests, including electrical resistivity ultra-pulse velocity conducted identify soundness concrete. The properties, i.e., energy dispersive spectroscopy, scanning electron microscopy, evaluated demonstrate effectiveness casting method. conductivity 0.29 W/m.k indicated excellent insulation performance SLWC, denoted ASTM C332. Carbonation was also considerably improved. results show that potential both non-structural applications.
Язык: Английский
Процитировано
18
Construction and Building Materials, Год журнала: 2024, Номер 437, С. 137043 - 137043
Опубликована: Июнь 12, 2024
Язык: Английский
Процитировано
6
Materials, Год журнала: 2024, Номер 17(5), С. 1068 - 1068
Опубликована: Фев. 26, 2024
With the increasing accumulation of alkaline industrial solid waste, mineralization CO2 using waste has broad application prospects. Carbide slag is highly and contains a large amount calcium elements, making it an excellent material for mineralization. Our idea was to acquire qualified products fast kinetics by integrating carbide utilization carbon reduction. The reaction route divided into two steps: extraction carbonization. In order achieve efficient utilizable calcium, we selected NH4Ac as agent, which advantage buffer protection environmental friendliness due being acetate radical. efficiency exceeded 90% under conditions L/S 20:1 NH4+/Ca2+ 2:1. carbonization process, crystal forms CaCO3 synthesized direct carbonation, acid extraction, ammonium salt were characterized. formation mechanism vaterite in solution influence impurities (Al3+, Mg2+) on transformation revealed. This study provides technical support prepare high-purity vaterite. Therefore, can be efficiently sustainably utilized through
Язык: Английский
Процитировано
6
Energy, Год журнала: 2024, Номер 302, С. 131858 - 131858
Опубликована: Май 30, 2024
Язык: Английский
Процитировано
6