摘要
对12个设计强度等级为C20、C30、C40、C50、C60、C70和C80的高性能混凝土结构实体构件进行了龄期为14 d、28 d、60 d、90 d、740 d和14年的碳化深度试验,分析了混凝土强度和龄期对高性能混凝土碳化深度的影响规律;通过构件碳化深度的直方图绘制和皮尔逊拟合优度检验,得出了碳化深度在显著水平为0. 05时服从正态分布;考虑混凝土立方体抗压强度标准值和环境因子的变异影响,分别给出了碳化深度平均值和碳化深度标准差的计算模型,建立了长龄期高性能混凝土碳化深度预测的随机计算模型。
The carbonation depth tests of 12 high performance concrete specimens were conducted.The design strength grade of specimens included C20,C30,C40,C50,C60,C70 and C80,and the design age included 14 d,28 d,60 d,90 d,740 d and 14 a respectively.The influence of concrete strength and concrete age on the carbonation depth was analyzed.Through the histogram and the Pearson fitting goodness test,it is shown that the carbonation depth of structural specimens obeys normal distribution at 0.05 significant level.Considering the influence of the concrete cubic compressive strength standard value and the environmental factor,the calculation models of the average carbonation depth and the carbonation depth standard deviation are all given,and the random calculation model for predicting the carbonation depth of high performance concrete is established.
作者
陈萌
李学稼
刘乐庆
CHEN Meng;LI Xuejia;LIU Leqing(School of Civil Engineering,Zhengzhou University,Zheegzhou 450002,China)
出处
《四川建筑科学研究》
2018年第5期80-84,共5页
Sichuan Building Science
基金
国家自然科学基金(50578148)
关键词
长龄期
高性能混凝土
碳化深度
立方体抗压强度标准值
环境因子
long-age
high performance concrete
carbonation depth
cubic compressive strength standard value
environmental factor
