粉煤灰混凝土早期碳化规律研究

Experimental analysis on early carbonization rule of fly ash concrete

选取粉煤灰掺量为0、10%、20%和30%,混凝土强度为C30、C40和C50的粉煤灰混凝土为研究对象,通过试验得到了粉煤灰混凝土浇筑后300天内自然条件下的碳化发展规律,分析研究了养护时间及不同浇筑面早期碳化发展的差异,建立了粉煤灰混凝土早期碳化深度的计算模型.结果表明:粉煤灰混凝土的早期碳化深度增长随养护时间的延长而减慢,碳化深度随粉煤灰掺量的增加而增大;浇筑顶面的碳化深度最大而底面的碳化深度最小.

The fly ash concrete with fly ash mixing quantity being accurately 0,10%,20% and 30%,as well as concrete strength being C30,C40 and C50,as study object,the carbonization development law of fly ash concrete within 300 days under the natural condition is established through some experiments,and the early carbonization development differences among different curing time and construction surface are analyzed.The results show that： along with the extended curing time,the early carbonization depth growth speed of fly ash concretes reduces.Along with the increased mixing quantity of fly ash,the carbonized depth of concrete increases.The carbonized depth of construct top surface is the biggest while bottom surface is the smallest.