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202413 · Ordinary Portland cement is a commonly used construction material but contributes to high carbon emissions. Here, a hydration control additive can modify the kinetics of ordinary Portland cement ...
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2023114 · Concrete hardens through the process of hydration, which occurs when water is mixed with cement. Hydration is a chemical reaction that transforms the cement particles into a solid, binding material. This reaction plays a vital role in determining the properties and strength of the resulting concrete. The hydration process begins …
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201148 · To optimize the hydration process of blended cement, cement clinker and supplementary cementitious materials (SCMs) were ground and classified into several fractions. Early hydration process of each cementitious materials fraction was investigated by isothermal calorimeter. The results show fine cement clinker fractions show very high …
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201171 · Abstract This paper is a keynote presentation from the 13th International Congress on the Chemistry of Cement. It discusses the underlying principles of hydration and recent evidence for the mechanisms governing this process in both Portland cements and other cementitious materials. Given the overriding imperative to improve the …
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20201012 · Understanding the complexity of the chemical and microstructural evolution of cement during hydration remains a controversial subject, and although numerous techniques have been used to assess this process, further insight is still needed. Alternating current impedance spectroscopy has been demonstrated to be a sensitive …
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2022927 · In the hydration process, the active constituents of metakaolin react with Ca (OH) 2 (a hydration product of cement) to form more hydration products. The gelling products, which are characterized by expansive properties, can fill the pores inside the cement and the gaps between the cement and aggregates to compact the overall …
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20231124 · The beginning of the setting was prolonged to 23 h. The influence of potassium methylsiliconate on the kinetics of cement hydration was investigated by isothermal calorimetry. The calorimetric results disclosed significant extension of induction period during Portland cement hydration with addition of potassium methylsiliconate as an …
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Abstract To ascertain the viability of utilizing lithium slag (LS) in the development of eco-friendly ultra-high performance concrete (UHPC), this paper provides a detailed analysis of the effects of LS on UHPC. Specifically, the hydration and microstructural changes in UHPC containing LS (LS-UHPC) were comprehensively examined.
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20211018 · Due to the prolongation of the Portland cement hydration process, the complex admixture of polycarboxylate ether plasticiser, carboxymethyl cellulose and carbon nanotubes causes a reduction in the total hydration heat emission by 72% after 24 h and by 26% after 48 h compared to Portland cement without admixtures.
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The hydration process of slag cement is more complicated than Portland cement. At first, the minerals in cement clinker react with water and generate calcium silicate hydrate, calcium aluminate hydrate, calcium ferrite hydrate and calcium hydroxide. Calcium hydroxide and gypsum mixed in cement are the alkali activator and the sulfate activator ...
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