掺合料对抗冲磨混凝土活化能的影响研究

Study on the effect of admixture on the activation energy of abrasion-resistant concrete

基于等强度的配合比设计原则,选定20、30、40、60℃四个养护温度。前后两次对活化能进行了测试,对ASTM C1074—04测试方法进行了改进:加密前期测试点和成型后的试件用保鲜膜密封。试验结果表明:温度将对胶材的反应造成直接影响,化学反应速率随着温度的升高而升高。养护温度较高时,早期水化程度或强度比养护温度较低时大,但从长期来看,强度则会小一些,甚至出现强度倒缩现象;抗冲磨混凝土强度开始发展所需最低温度在1~5℃之间;硅粉和膨胀剂对于提高混凝土的活化能具有一定促进作用。

Based on the equal strength of the design principles, selected four curing temperaatres-20 degrees, 30 degrees, 40 degrees and 60 degrees.The activation energy was tested before and after two times, and the test method of C 1074-04 ASTM was improved.The early test point was encrypted and the molding test piece were sealed with plastic wrap.The results showed that the reaction of the rubber was di- rectly affected by the temperature, and the reaction rate increased with the increase of the temperature.Curing temperature is high, the early hydration degree or strength is higher than curing temperature is lower, but in the long run, the strength will be smaller, and even the reduction phenomenon for strength.Abrasion resistant concrete strength began development required minimum temperature between 1 degrees to 5 degrees.Silica fume and expansion agent has a certain role in promoting activation energy for concrete.