环境温度对快硬性水泥基修补材料性能的影响

Influence of Ambient Temperature on Properties of Fast Setting Cement-based Repair Materials

为研究环境温度对快硬性水泥基修补材料性能的影响,选用改性硅酸盐水泥基材料和磷酸盐水泥基材料2种常用修补材料,通过测试不同环境温度下修补材料的凝结时间、温升曲线、抗折强度和抗压强度,分析环境温度对凝结时间、内部温升峰值、峰值出现时间、内部温度变化速率、早期强度和后期强度的影响,并对环境温度和凝结时间进行相关性分析。结果表明,随着环境温度升高,水泥基修补材料的凝结时间逐渐减小,并且两者之间具有很好的线性相关性,相关系数R^(2)>0.9。环境温度升高可以提高早期强度,但会使后期强度降低。相比于3℃条件下的强度,30℃条件下的磷酸盐水泥基材料7 d龄期抗折强度减少了22.8%,抗压强度较少了8.7%;改性硅酸盐水泥基材料7 d龄期抗折强度减少了17.4%,抗压强度减少了1.0%。

In order to study the influence of ambient temperature on the properties of fast setting cement-based repair materials,two commonly used repair materials,modified Portland cement-based materials and phosphate cement-based materials,were selected to test the setting time,internal temperature rise curve,flexural strength and compressive strength of the repair materials under different ambient temperatures.The influence of ambient temperature on setting time,internal temperature rise peak,peak occurrence time,internal temperature change rate,early strength and late strength were analyzed,and the correlation between ambient temperature and setting time was analyzed.The results show that with the increase of ambient temperature,the setting time of cement-based repair materials gradually decreases.There is a good linear correlation between them,and the correlation coefficient is greater than 0.9.When the ambient temperature increases,the early intensity of high temperature increases,but the late intensity decreases.Compared with the strength at 3℃,the 7 d flexural strength of the phosphate cement-based material at 30℃decreased by 22.8%and the compressive strength decreased by 8.7%.The flexural strength of the modified Portland cement-based material decreased by 17.4%and the compressive strength decreased by 1.0%at 7 days.