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• W4309520620 endingPage "105586" @default.
• W4309520620 startingPage "105586" @default.
• W4309520620 abstract "As one of the most typical mineral phases in the mine tailings (MTs), the reactivity of quartz has a remarkable influence on the hydration properties of MTs based cementitious materials. In this study, the pure quartz powder (QP) through the alkali-hydrothermal activation was used as an alkaline source for producing one-part Ca-rich slag based cementitious materials (OPM), and the activation mechanism of QP, compressive strength, hydration heats, hydration reactants, and microstructure of OPM samples were investigated, which contributes to evaluate the performance of MTs-based cementitious materials. The reactivity of crystalline QP was enhanced via an alkali-hydrothermal treatment at 200–300 °C in the presence of NaOH. Sodium silicate reactant in the activated QP can dissolve in water to release OH− and Si species, making it an alkaline source for the OPM preparation. Just like cement, OPM samples were synthetized by only adding water to the mixture of activated QP and Ca-rich slag. Appropriate ratios of starting materials were beneficial for the increase in hydration rate, generation of numbers of hydration products, and refinement of microstructure of OPM samples. When the weight ratio of activated QP and slag was 40:60, the OPM sample showed a 28-day strength of 47.6 MPa. Based on the Chinese GB/T 175–2007 standard, this strength development reaches the requirement of 42.5 cement and exhibits the possibility that the OPM sample may be applied in the general construction field." @default.
• W4309520620 created "2022-11-28" @default.
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• W4309520620 date "2023-04-01" @default.
• W4309520620 modified "2023-09-26" @default.
• W4309520620 title "Use of activated quartz powder as an alkaline source for producing one-part Ca-rich slag based cementitious materials: Activation mechanism, strength, and hydration reaction" @default.
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• W4309520620 doi "https://doi.org/10.1016/j.jobe.2022.105586" @default.
• W4309520620 hasPublicationYear "2023" @default.
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