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为了研究粉煤灰掺量和温度对水泥水化的影响,测试了粉煤灰掺量0~60%的水泥-粉煤灰水化体系,在温度20、24和28℃下的凝结时间及2 d内的电阻率发展及抗压强度,发现凝结时间与电阻率发展速率曲线的第一峰值点对应时间遵循线性关系.在同一温度下,2 d的抗压强度和电阻率值显示出良好的正相关线性关系——温度越高,斜率越小,表明电阻率比强度对温度变化更加敏感.扫描电镜结果论证了粉煤灰在2 d内尚未参与水化反应,主要起填充和稀释作用.因此,可借助电测法估算和预测变温条件下水泥-粉煤灰水化体系的抗压强度及凝结时间.
In order to study the influence of fly ash content and temperature on the hydration of cement, the cement-fly ash hydration system with 0 ~ 60% fly ash content was tested. The coagulation time at 20, 24 and 28 ℃ The resistivity and compressive strength were found within 2 days, and it was found that the corresponding time of the first peak of the curve of the setting time and the rate of resistivity follows a linear relationship. At the same temperature, the compressive strength and resistivity at 2 d showed good The higher the temperature is, the smaller the slope is, indicating that the resistivity is more sensitive to temperature than the intensity.The scanning electron microscopy results show that the fly ash has not participated in the hydration reaction within 2 days, and mainly plays the role of filling and dilution Therefore, the compressive strength and setting time of cement-fly ash hydration system can be estimated and predicted by electrical measurement method.