等强度条件下矿物掺合料对混凝土热学性能的影响

摘要

在等强度(C45、C60)条件下,分别利用了水化热测定仪和混凝土绝热温升双曲线表达式研究了矿物掺合料对混凝土中胶凝材料水化热及对混凝土绝热温升的影响,研究结果表明:掺入大掺量的矿物掺合料可以有效的降低混凝土中胶凝材料的水化热和混凝土的绝热温升,从降低水化热的效果上来看,降低水化热的效果排序则为:单掺粉煤灰＞复掺粉煤灰与矿粉＞单掺矿粉;在28 d时,C60混凝土的绝热温升从整体上高于C45混凝土,但是混凝土绝热温升减小的幅度(分别不超过9.6％、6.1％和10.6％)不是很明显.%In the same intensity,C45,C60,conditions,the effects of mineral admixtures on the hydration heat of cementitious materials in concrete and the adiabatic temperature rise of concrete were studied respectively by using hydration calorimeter and concrete adiabatic temperature rise hyperbolic expression.The results of the study shows that:the incorporation of high content of mineral admixture effectively reduces the heat of cementitious material hydration heat and concrete adiabatic temperature rises,reducing the effect of hydration heat from the effect of reducing heat of hydration The effect order is as follows:single mixed fly ash ＞ double mixed fly ash and mineral powder ＞ single mixed mineral powder;,at 28 days,the adiabatic temperature rise of C60 concrete is generally higher than that of C45 concrete,but the decrease of concrete adiabatic temperature rise,ess than 9.6 ％,6.1％ and 10.6 ％ respectively,is not obvious.