温度匹配养护对大掺量粉煤灰混凝土强度的影响  

Effect of Temperature-matched Maintenance on Strength of Concrete with High-volume Fly Ash

作　　者：宋博涵 田景松 王雷 王宇欣 章鹏 Song Bohan;Tian Jingsong;Wang Lei;Wang Yuxin;Zhang Peng(Beijing Gaoqiang Concrete Co.,Ltd.,Beijing 101102,China)

机构地区：[1]北京市高强混凝土有限责任公司,北京101102

出　　处：《市政技术》2024年第12期101-108,136,共9页Journal of Municipal Technology

摘　　要：温度匹配养护是一种针对大体积混凝土的同步养护方法,旨在使试件的养护温度与混凝土结构内部的温度历程相匹配,从而更真实地反映混凝土结构的强度。通过变温条件下的胶砂强度试验,证明了温度对于掺粉煤灰的水泥胶砂强度影响显著。大掺量粉煤灰混凝土的标准养护强度试验和绝热温升试验表明,掺入40%~60%的粉煤灰可以显著降低混凝土的绝热温升,其强度也能满足大体积混凝土的施工需求。通过混凝土构件试验,确定50%粉煤灰混凝土构件的截面临界厚度为0.45 m;低温环境下,该厚度应增加到0.80 m,同时采用绝热温升高的混凝土并增加保温措施。通过工程案例证明了大掺量粉煤灰混凝土的温度匹配养护强度超过同期标准养护强度,表现出良好的早期强度性能,这为大掺量粉煤灰混凝土的应用提供了指导。Temperature matching maintenance is a synchronous curing method for mass concrete,which aims to match the curing temperature of the specimen with the temperature history inside the concrete structure,so as to more truly reflect the strength of the concrete structure.Through the mortar strength test under variable temperature,it is proved that the temperature has significant effect on the strength of cement mortar mixed with fly ash.The standard curing strength test and adiabatic temperature rise test of concrete with large amount of fly ash show that adding 40%~60%fly ash can significantly reduce the adiabatic temperature rise of concrete,and its strength can also meet the construction requirements of mass concrete.Through the test of concrete members,the critical thickness of 50%fly ash concrete members is determined 0.45 m;In the low temperature environment,the thickness should be increased to 0.80 m.At the same time,concrete with adiabatic temperature rise and thermal insulation measures should be added.By the engineering case,that the temperature matching curing strength of high volume fly ash concrete exceeds the standard curing strength in the same period,showing good early strength performance,which provides guidance for the application of high volume fly ash concrete.

关 键 词：温度应力 大掺量粉煤灰 温度匹配养护 截面临界尺寸 早期强度 

分 类 号：TU528[建筑科学—建筑技术科学]