【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.更多还原

【Abstract】 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.更多还原