Unlock the full potential of ordinary Portland cement with hydration control additive enabling low-carbon building material
Research Square (Research Square)(2023)
摘要
Abstract Ordinary Portland cement (OPC) is the core ingredient of many construction materials. In 2022, 4.1 billion tons were used worldwide, contributing to approximately 8% of anthropogenic CO2 emissions (~3 Gt/year). There are alternatives to OPC such as aluminate cement and geopolymers, but due to the cost and availability of raw materials, their application is limited2. Thus, the use of OPC-based construction materials is expected to remain significant. Nevertheless, the complete strength-generating capacity of OPC remains unrealized due to the restricted conversion of aluminates to ettringite, caused by conventional hydration kinetics. In this study, we employ a hydration control additive that selectively modifies the hydration kinetics, thereby facilitating enhanced dissolution of aluminates in OPC, which promotes the formation of ettringite at a specific desired time. The increased ettringite content improves packing of the cement, resulting in ~50% higher specific strength thus enables cement reduction. The increased efficiency of strength development of OPC reduces the carbon footprint by at least ~30%. The use of this additive can be combined with methods such as reducing the amount of water and/or using supplementary cementitious materials (SCMs) to prepare building materials with significantly fewer CO2 emissions than those from conventional OPC.
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关键词
ordinary portland cement,portland cement,hydration control,building,low-carbon
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