多因素影响下混凝土绝热温升计算模型研究

混凝土绝热温升与混凝土的龄期、水胶比、粉煤灰掺量和温度等多种因素有关,目前缺乏综合考虑这些影响因素的混凝土绝热温升计算模型。通过对不同水胶比、粉煤灰掺量和入模温度条件下的混凝土开展绝热温升试验,分析了诸因素对混凝土绝热温升和温升速率的影响,提出了新的计算模型,并确定了特征参数及验证了模型的准确性。结果表明,新模型能采用统一的函数来描述不同配合比和温度历程下的混凝土绝热温升过程,且与混凝土绝热温升试验的实测数据吻合较好,可以较精确地预测混凝土结构温度变化,具有一定的实用价值。

Adiabatic temperature rise calculation model based on multiple factors

The adiabatic temperature rise of concrete depends on the age of concrete, water-binder ratio, fly ash content and temperature;however there is a dearth of adiabatic temperature rise calculation model that could consider all these factors. A se-ries of experiments with different initial conditions, namely different water-binder ratio, fly ash content and pouring tempera-ture, were carried out, and the influences of all these factors on adiabatic temperature rise and temperature rise rate are dis-cussed. A new method is given for adiabatic temperature rise calculation that takes into account of the four factors, the character-istic factors are determined and the presented model is verified. It indicates that the presented model can describe the adiabatic temperature under different proportion ratio and thermal history with a uniform function, and the calculated values are in agree-ment with experiment data, so it could predict the temperature variation of structures accurately.