Influence of size‐classified and slightly soluble mineral additives on hydration of tricalcium silicate (original) (raw)

2019, Journal of the American Ceramic Society

As the production and use of ordinary Portland cement (OPC) continues to increase globally, 1 pressure is mounting on the cement industry to discover alternate manufacturing processes and resources to mitigate CO 2 emission associated with OPC manufacturing. 1-4 A potential solution, currently being extensively explored and optimized by researchers, is partial replacement of OPC with CO 2-efficient pozzolanic mineral additives (eg, metakaolin) and filler materials (eg, limestone and quartz). Since OPC-based systems (ie, pastes, mortars, and concretes) are complex, comprising of numerous anhydrous (ie, reactants) and hydrated (ie, reaction products) phases at any given instant of time, researchers have prioritized the examination of pure, single-phase synthetic cementitious compounds such as tricalcium silicate (written as C 3 S in cement chemistry notation, where C = CaO; S = SiO 2 ; A = Al 2 O 3 ; and H = H 2 O) 5-14 instead of OPC. C 3 S, which embodies 50%-70% mass of OPC, is the phase most representative of OPC's early-age hydration (ie, reaction with water)