Physico-chemical and mechanical properties of fly ash based
2021.6.21 The authors synthesized fly ash-based geopolymer pastes with different SiO 2 /Na 2 O mass ratios (1.1, 1.3 and 1.5) and cured them at 60 and 90 °C. They
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Mechanical and microstructural performances of fly ash blended
2022.12.5 In this study, fly ash (FA) was used as a cement replacement at 10, 15, and 20 wt.% to overcome the CO 2-injecting caused negative impact. The effects of CO
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Fly ash properties, characterization, and applications: A review
2021.9.1 Fly ash (FA) is the principal industrial waste byproduct from the burning of solid fuels. FA is a powdery solid that is constituted mostly of unburned carbon (UC),
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Fresh mechanical and durability properties of alkali-activated fly
2021.12.1 Fly ash is a by-product of the pulverized coal from thermal power plants. Fly ash is classified into two types, i.e., Class C and Class F . Class C is a high calcium
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Physico-chemical and mechanical properties of fly ash based
2021.6.21 Physico-chemical and mechanical properties of fly ash based-geopolymer pastes produced from pre-geopolymer powders obtained by
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Influence of calcium compounds on the mechanical properties of
2009.8.15 The influence of calcium compounds (CaO and Ca (OH)) on the mechanical properties of fly ash based geopolymers has been studied. Calcium
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Mechanical properties and microstructure of magnesia–fly ash
This paper investigates the strength and hydration reaction of reactive MgO–fly ash blends at room temperature up to 90 days. The variation of compressive strength is studied by
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Mechanical, Structural and Microstructural Properties of CFB ...
2022.9.30 The mechanical, structural and microstructural properties of the CSGP were investigated based on orthogonal experiments (L16(45)). ... Ziyani L, Alehyen S (2021) Physico-chemical and mechanical properties of fly ash based-geopolymer pastes produced from pre-geopolymer powders obtained by mechanosynthesis. Constr Build
Charlar en LíneaFire Free Full-Text Silica Fume Enhances the
2023.5.30 The fireproof design of geopolymers through adjusting multi-component metallurgical solid wastes has attracted increasing attention, due to their potential low carbon emission, cost effectiveness,
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Chemical and Microstructural Properties of Fly Ash
2022.5.29 The micrographs of alkali-activated neat fly ash and 60%/40% fly ash/slag pastes are shown in Figure 5. The WG-based activator seems to allow a satisfactory dissolution of raw materials, not
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Influence of calcium compounds on the mechanical properties of fly ash ...
2009.8.15 The influence of calcium compounds (CaO and Ca(OH) 2) on the mechanical properties of fly ash based geopolymers has been studied.Calcium compounds were substituted in fly ash at 1, 2 and 3 wt%, respectively.Curing of the geopolymers was performed at ambient temperature (20 °C) and 70 °C.Addition of
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Effect of activator on rheological properties of alkali-activated slag ...
2022.2.14 The time-dependent rheological behaviors of alkali-activated cement (AAC) are expected to be precisely controlled, in order to meet the requirements of modern engineering practices. In this paper, the effects of activator, including the Na2O concentration and SiO2/Na2O (S/N) molar ratio, on the rheological behavior of alkali
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Effects of fineness and chemical activators on the hydration and ...
2022.7.1 1. Introduction. Fly ash (FA) is a by-product of coal power plants and is used to replace ordinary Portland cement (OPC) as a binder in cementitious materials for environmental purposes, such as CO 2 reduction [1].FA improves the long-term durability and mechanical performance of cementitious materials [[2], [3], [4], [5]].However,
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Fresh mechanical and durability properties of alkali-activated fly ash ...
2021.12.1 The flow of paste was halted around 30 min for 100% GGBFS pastes, while there was a constant flow of paste for 100% fly ash pastes because of the low reactivity of fly ash shown in Fig. 4. An addition of superplasticizers or extra water can be used to improve workability which may improve the applicability of alkali activated paste
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Hydration and Mechanical Properties of High-Volume Fly Ash
2022.9.23 Hydration and Mechanical Properties of High-Volume Fly Ash Concrete with Nano-Silica and Silica Fume. Byung-Jun Kim, Geon-Wook Lee, and Young ... Parthasarathy P., Ma H., Fan T., Li Z. Properties improvement of fly ash cenosphere modified cement pastes using nano silica. Cem. Concr. Compos. 2017; 81:35–48. doi:
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Modification of water absorption and pore structure of high-volume fly ...
2021.1.1 High-volume (>50%) fly ash (HVFA) is used to partially replace cement in concrete to reduce the greenhouse gas emission, which is beneficial to both cement industry and environment. However, one drawback of using high-volume fly ash cement (HVFAC) is the increase of the water absorption and the reduction of the durability of cement-based
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Mechanical and Dielectric Properties of Fly Ash
2022.3.12 the mixture and stirred by a mechanical blender at 285 rpm for 5 min. Subsequently, the Na2SiO3 solution was added and mixed for another 5 min at the same speed. The ratio of Na2SiO3 to NaOH was 1.0, and a liquid to ash ratio (L/A) of 0.45 was used. After that, the geopolymer paste was poured into a 2.5 32.5 2.5 cm acrylic mold for
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Fresh and Hardened Properties of Fly Ash–Slag Blended
2019.8.29 Influence of calcium compounds on the mechanical properties of fly ash geopolymer pastes. Journal of Hazardous Materials, 167(1), 82–88. Article Google Scholar Temuujin, J., Williams, R. P., Van Riessen, A. (2009b). Effect of mechanical activation of fly ash on the properties of geopolymer cured at ambient temperature.
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Microstructure and mechanical properties of fly ash blended cement pastes
2014.12.30 The elastic modulus of CH obtained in this study fell in its theoretical range. Finally, the average indentation modulus and hardness of CH in fly ash blended cement pastes were estimated as 47.9 ± 6.0 GPa and 1.94 ± 0.48 GPa, respectively. The values are higher than that in neat cement pastes (41.1 ± 7.7 GPa and 1.64 ± 0.48 GPa).
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The effect of activator concentration on the residual strength
2011.7.1 Fly ash blended Portland cement pastes have performed better at these temperatures than Portland cement alone since the fly ash reduced the amount of Ca(OH) 2 in the binder following hydration [32], [33]. In short, it is clear that enormous efforts were made throughout the 20th century to improve Portland cement concrete technology.
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The Effect of Mechanical Activation of Fly Ash on Cement-Based
2023.4.7 Due to increased fly ash reactivity from their mechanical activation, hardened cement paste with milled fly ash exhibited better compressive strength than cement paste with unmilled fly ash. After 28 days of curing, the sample with 5% cement replacement by UFA increased the strength of samples by 5.8%, and a further increase
Charlar en LíneaPolymers Free Full-Text Effect of Waste Ceramic Powder on
2021.11.2 This paper presents the effects of alkali-activated blast furnace slag and fly ash (AASF) paste added with waste ceramic powder (WCP) on mechanical properties, weight loss, mesoscopic cracks, reaction products, and microstructure when exposed to 300, 600, and 900 °C. Using waste ceramic powder to replace blast furnace slag and fly
Charlar en LíneaInfluence of calcium compounds on the mechanical properties of fly ash ...
2009.8.15 The influence of calcium compounds (CaO and Ca(OH) 2) on the mechanical properties of fly ash based geopolymers has been studied.Calcium compounds were substituted in fly ash at 1, 2 and 3 wt%, respectively.Curing of the geopolymers was performed at ambient temperature (20 °C) and 70 °C.Addition of
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Microstructure Properties of Popular Alkali-Activated Pastes Cured
2023.3.24 This paper reported on the micro-level properties of alkali-activated pastes cured in ambient conditions. The mechanisms influencing setting time and the microstructure development of fly ash, slag, and metakaolin were studied. The mortar compressive strength of the binders and their ultrasonic pulse velocity (UPV) were tested after 56 days
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Nanoindentation-probed Oliver-Pharr half-spaces in alkali
2.1. Materials, mixtures, and casting. In the present study, ground granulated blast furnace slag with a density of 2.92 g cm – 3 and fly-ash with a density of 2.32 g cm – 3 were used as the binder material, whereby the mass fractions of slag and fly ash amounted to 50% each. Their chemical composition was determined by X-ray fluorescence spectroscopy
Charlar en LíneaInvestigation on high-volume fly ash pastes modified with micro
2020.1.31 Portland cement (PC) containing high-volume fly ash (HVFA) is usually used to obtain economical and more sustainable merits, but these merits suffer from dramatically low compressive strength especially at early ages. In this work, the possibility of using micro-size metakaolin (MSK) particles to improve the compressive strength of
Charlar en LíneaPhysico-chemical and mechanical properties of fly ash based
2021.6.21 The authors synthesized fly ash-based geopolymer pastes with different SiO 2 /Na 2 O mass ratios (1.1, 1.3 and 1.5) and cured them at 60 and 90 °C. They detected that after geopolymerization and 28 days of thermal curing, the most significant band in raw fly ash at approximately 1100 cm −1 shifted to approximately 1023 cm −1.
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