石灰石粉对水泥基材料水化动力学的影响

利用TONI差分量热仪,测量了石灰石粉掺量分别为0,30%,50%(质量分数,下同)以及粉煤灰掺量为50%的水泥基材料水化放热速率和水化放热量曲线.运用动力学方法进行分析,得到了反应速率常数K,水化度α,反应级数N等动力学参数,并依此评价了石灰石粉对水泥基材料水化机理和水化过程的影响.结果表明,石灰石粉对水泥基材料的早期水化有促进作用,特别是当石灰石粉掺量为50%时,水化迅速由NG过程向I过程转变,影响尤为明显.

Effect of Limestone Powder on Hydration Kinetics of Cement-Based Composites

Hydration exothermic rate and quantity of cement-based composites containing 0,30% and 50% limestone powder and 50% fly ash were measured with TONI calorimeter.The reaction constant K,de-gree of hydration α and reaction exponent N can be calculated by using kinetic method,from which the mechanism of the hydration process can be known.The results show that limestone powder promotes early hydration of cement-based composites,especially when limestone powder content is 50%,hydration turns from NG progress to I progress rapidly.