摘要
研究了水胶比、高效减水剂、矿物掺合料对高性能混凝土中胶结材浆体水化热的影响 .结果表明 :当水胶比降低时 ,胶结材浆体的水化热也随之下降 ;缓凝高效减水剂并不降低总水化热 ,但它推迟水化放热进程 ,加快后期的水化放热速率 ;矿物掺合料的加入可明显降低水化热、水化放热速率 ,推迟达到最高温度的时间 ,尤其是双掺、三掺时降低效果更为显著 .利用这三个因素的作用———减小水化热或延迟水化放热进程 ,可以降低因高性能混凝土水泥用量多及标号高所造成的早期高水化热的程度 ,缓解温差应力的影响 ,提高混凝土的耐久性 .
The influences of water binder ratio, superplasticizer and mineral blend on the hydration heat of the binder paste were studied by means of hydration heat experiments. The results show that the hydration heat decreases with decrease of water binder ratio of binder paste. The total hydration heat will not decrease with the addition of superplasticizer which contains retarding composite, however the hydration exothermic process is delayed and the later stage hydration is accelerated. Mineral blend can markedly reduce the hydration heat and the hydration exothermic rate, and postpone the arrival time of the highest temperature, particularly the double adding and tri adding. The influence of these three factors on hydration heat will counteract the deficiency of high hydration heat at early stage due to high content and high strength cement. In this way, the influence of temperature stress is alleviated and the durability of concrete is enhanced.
出处
《建筑材料学报》
EI
CAS
CSCD
2000年第3期202-206,共5页
Journal of Building Materials
关键词
胶结材浆体
水胶比
高性能混凝土
高效减水剂
binder paste
water binder ratio
superplasticizer
mineral blend
hydration heat
