在役结构混凝土强度与碳化水平的调研分析

Investigation on compressive strength and carbonation for on service concretes

基于深圳市部分在役结构的随机取样,分别测试了混凝土芯样的抗压强度和碳化深度并分析了抗压强度、自然碳化深度和服役年限三者之间的相关关系。研究表明:所取混凝土芯样的抗压强度处于25~35 MPa,且抗压强度呈逐年增长趋势;碳化深度的平均值为5.15 mm,而碳化深度值小于10 mm的芯样占比达92%,表明在役结构混凝土的碳化水平不高;抗压强度与碳化系数两者的相关系数仅为0.03,相关性较弱。

Concrete samples from different on service structures in Shenzhen were extracted.The compressive strength and degree of carbonation were determined and their correlation with service life was analysed.Results show that the compressive strength increases with service life and has an average compressive strengths of 25-35 MPa.The degree of carbonation was at a relatively low level,with the mean carbonation depth of the samples of 5.15 mm and 92% samples were lower than 10 mm.The correlation between compressive strength and carbonation index is weak, with a value of 0.03.