Abstract
High belite-calcium sulfoaluminate (HBCSA) cement has been developed as an eco-friendly building material, as it emits up to 35% less CO2 into the atmosphere and consume around 25% less energy in production compared with ordinary Portland cements. However, the hydraulic reactivity of C2S is low. Hence, the clinker of HBCSA activated by P2O5, B2O3, BaO, and ZnO, respectively, was studied in this paper to establish a methodology to clarify the activation mechanism. X-ray powder diffraction, scanning electron microscope, and infrared spectroscopy were used to identify the mineralogical changes in the microstructure. The results showed that the stabilizers varied a lot in the effect on microstructures of minerals. Its sequence of the effect on lattice stress of HBCSA clinker as a whole is Ba2+ > P5+ > Zn2+ > reference > B3+, the same to β-C2S mineral and cement strength at 28 days. But, there is a little difference for the sequence of their effect on , P5+ > Ba2+ > Zn2+ > Reference > B3+. The minor ionic doping activates the two minerals of β-C2S and , which are caused by disorder and defects in mineral lattice at high temperature.
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