超高强混凝土用低水胶比浆体的水化热研究  

Research on the Hydration Heat of Paste in Ultra High Strength Concrete at Low Water-Binder Ratio

作　　者：刘建忠[1,2] 孙伟[1] 缪昌文[2] 刘加平[2] 

机构地区：[1]东南大学江苏省土木工程材料重点实验室,江苏南京211189 [2]江苏省建筑科学研究院有限公司,江苏南京210008

出　　处：《建筑材料学报》2010年第2期139-142,168,共5页Journal of Building Materials

基　　金：国家重点基础研究发展计划(973计划)项目(2009CB623200)

摘　　要：采用自行改进的水化热测定系统,研究了粉煤灰、矿渣粉和水胶比对超高强混凝土用低水胶比浆体水化热和水化进程的影响规律.结果表明:掺10%(质量分数,下同)粉煤灰或矿渣粉不影响低水胶比浆体的水化进程;掺30%,50%粉煤灰或矿渣粉均使低水胶比浆体的水化温升和水化放热速率峰值明显降低,并延缓这些峰值出现的时间,且粉煤灰对水化进程的延缓效果优于同等掺量的矿渣粉;提高水胶比只能略微推迟浆体的水化温升和水化放热速率峰值出现的时间,使水化放热速率峰值有所增大,不会改变浆体温升曲线和放热速率曲线的形状.The effects of fly ash,ground granulated blast-furnace slag and water-binder ratio（m_w/m_b） on the hydration heat and the hydration exothermic process of paste in ultra high strength concrete at low m_w/m_b were investigated by the test system of hydration heat.According to the experimental results,the hydration exothermic process of paste,with the replacement level of 10% fly ash or slag,is similar to that of the control.However,with the increasing addition of fly ash or slag to 30% or more,the highest hydration temperature and the highest hydration exothermic rate will markedly reduce,and the arrival time of the peak is postponed.Compared with slag,fly ash is more propitious to delay the hydration exothermic process of binder system with low m_w/m_b.Moreover,with the increase of m_w/m_b,the time of the highest hydration temperature and the highest hydration exothermic rate are slightly delayed,and the hydration exothermic peak is increased to a certain extent.In addition,m_w/m_b does not change the shape of the curves of temperature rise vs.time and exothermic rate vs.time.

关 键 词：超高强混凝土 水化热 低水胶比 

分 类 号：TQ172.11[化学工程—水泥工业]