掺粉煤灰混凝土绝热温升速率特征及模型研究  

Characteristics and Modelling of Adiabatic Temperature Rise Rate of Medium-volumed Fly-Ash Concrete

作　　者：权娟娟[1] 傅少君[2] 杨如东 陈健 张凯峰 QUAN Juan-juan;FU Shao-jun;YANG Ru-dong;CHEN Jian;ZHANG Kai-feng(Shaanxi Key Laboratory of Safety and Durability of Concrete Structure,Xijing University,Xi’an 710123,China;School of Civil Engineering,Wuhan University,Wuhan 430072,China;China West Construction North Co.,Ltd.,Xi’an 710065,China)

机构地区：[1]西京学院陕西省混凝土结构安全与耐久性重点实验室,西安710123 [2]武汉大学土木建筑工程学院,武汉430072 [3]中建西部北方有限公司,西安710065

出　　处：《长江科学院院报》2023年第4期134-140,共7页Journal of Changjiang River Scientific Research Institute

基　　金：陕西省科技厅自然科学基金项目(2023-JC-YB-482);国家自然科学基金青年基金项目(51902270)。

摘　　要：绝热温升速率是影响混凝土绝热温升的关键因素,通过对3种初始温度、5个水胶比的35%掺量粉煤灰混凝土开展绝热温升室内模型试验,研究初始温度和水胶比对绝热温升及绝热温升速率曲线的影响规律,提出绝热温升速率加速期、减速期和衰速期三阶段的划分标准,建立考虑水胶比、初始温度的粉煤灰混凝土绝热温升速率三阶段模型,可以预测各个龄期的绝热温升速率,对大体积混凝土温控具有一定的参考价值。Adiabatic temperature rise rate is the key factor affecting the adiabatic temperature rise of concrete.Indoor adiabatic temperature rise test was carried out on fly-ash(content 35%)concrete.The test was controlled with three initial temperatures and five water-binder ratios.The influence rules of initial temperature and water-binder ratio on the adiabatic temperature rise and the rise rate were examined.The standard of dividing three stages of adiabatic temperature rise rate was put forward.A three-stage model of adiabatic temperature rise rate of medium-volumed fly ash concrete was established.The model takes into consideration water-binder ratio,initial temperature and age,and predictes accurately the adiabatic temperature rise rate at each age.The results can provide reference for temperature adiabatic controlling of mass concrete.

关 键 词：绝热温升 绝热温升速率 粉煤灰混凝土 初始温度 水胶比 三阶段模型 

分 类 号：TV41[水利工程—水工结构工程]