矿渣对阿利特-硫铝酸钡钙水泥水化硬化过程的影响

Effect of GGBS on hydrating and hardening process of alite-barium calcium sulphoalu-minate cement

通过对水泥力学性能、水化速率和水泥硬化浆体孔结构的测定,结合XRD、SEM分析,研究了矿渣对阿利特-硫铝酸钡钙水泥水化硬化过程的影响。研究结果表明:掺入矿渣后,水泥的早期强度下降幅度较大,但后期强度下降幅度较小。在试验掺量范围内,当矿渣掺量为20%时,该水泥各龄期抗压强度下降幅度最小,其后期抗压强度接近纯熟料水泥;加入矿渣后,水泥水化热明显降低,矿渣在受到碱激发与硫铝酸盐双重激发作用下发生二次水化反应,使水泥水化速率有一定增加而出现第三个放热峰;矿渣二次水化反应有效地改善了硬化水泥浆体的孔结构,使水泥后期强度逐渐增加。

According to measurement of the mechanical property, hydration rate of cement and pore structure of hardened cement pastes, the effect of GGBS during hydrating and hardening process of alite-barium calcium sulphoaluminate cement were studied by XRD and SEM. The obvious and slight loss of early and later strength respectively had been observed while GGBS had been added, and would tend to minimums if the amount of GGBS approach to 20%, and the later compressive strength of the hardened pastes were close to that of pure clinker cement pastes. The heat of hydration reduced significantly after GGBS adding. The hydration rate of cement would be increased and the third exothermal peak would be appeared for the secondary hydrating reaction of GGBS that stimulated by alkali and sulfur aluminum salts. The pore structure of cement pastes would be improved by the secondary hydrating reaction and the latter strength of cement would be increased gradually.