大体积粉煤灰混凝土实际强度的评价研究

Study on real strength of mass fly ash concrete

在大体积底板工程的混凝土上、中、下三层预埋热电耦 ,设置多个分区、几十个测温点 ,直接测试混凝土的内部平均温度 ,按实测温度控制混凝土养护箱 ,使之接近混凝土内部的实际环境 ,测试了同种配比条件下、不同龄期的大体积粉煤灰混凝土强度 ,评价结果表明 ,大体积粉煤灰混凝土各龄期的实际强度远远高于同种配合比的标准养护强度 ,3d强度高 30 5 % ,6d强度高 71 5 % ,2 8d强度高 42 1% ,与基准混凝土强度相比 ,6d以后的各龄期强度明显高于基准混凝土的强度。

In baseplate of mass concrete,the thermocoupes are embedded at the top,the middle part and the bottom.Many zone and temperature measurement points by scores are set up.The average temperature of internal cncrete is tested.According to the real temperature,concrete curing box is controlled,as internal concrete environment,The strength of mass fly ash concrete of the same mix proportion and different ages.These preliminary results indicate that the strength of mass fly ash concrete far exceeds the strength of same mix proportion by standard curing every ages,and the strength after 6 days is far higher as compared with plain concrete.