研制了新的具有球形凹面的混凝土试块及相应模具,实现了混凝土碳化试块的非破坏测试;选择了茜素黄R作为酸碱指示剂,合理地确定了检测时的碳化界面.进行了混凝土碳化深度的长龄期(≥120 d)碳化实验,并用回归方法得出了相应碳化方程.利用灰色系统理论,研究了混凝土碳化的时依性规律,确定了该混凝土碳化方程的动态模型,该模型将为服役混凝土结构的耐久性评估提供更为科学的依据.
By analysing the concrete equation x=at~b,it is confirmed that the time-dependent exponent b of a certain kind concrete is an undetermined constant.A new concrete specimen mold was manufactured which provided the specimen with spherical concave shape and a smooth test surface,and made nondestructive test of the concrete carbonation specimen possible.In order to determine the carbonation interface properly,Alizarin yellow R is chosen as the acid base indicator.Long period tests of concrete carbonation depth were conducted(more than 120 d),from which the equation of carbonation was established.At last,by utilizing the gray system theory and studying the time dependent rule of concrete carbonation,a dynamic model of carbonation equation is established that may provide a more scientific basis for estimation of structural endurance of in-service concrete.
