海洋环境混凝土耐久性无损检测指标及其控制标准

Nondestructive Testing Index of Durability of Concrete in Marine Environment and the Control Standard

本文分别采用RCM(Rapid Chloride Migration)快速离子迁移法、Permit离子迁移法和AUTOCLAM法开展了试验研究,同时考虑了水胶比、掺合料种类和用量及模板类型等因素的影响,建立了Permit法测得的混凝土氯离子扩散系数DPermit与规范中所采用的RCM法测得的氯离子扩散系数DRCM之间的关系并与AUTOCLAM法所测得的空气渗透性系数、水渗透性系数进行对比.研究表明,AUTOCLAM法所测得的空气渗透性系数、水渗透性系数,离散性均较大;RCM法和Permit法测试结果的变化规律基本相同,但Permit法测试氯离子扩散系数DPermit成功率更高,且数值更稳定.从测试过程的可操作性及测试结果的稳定性、准确性等方面综合分析,最终确定取Permit离子迁移法测得的氯离子扩散系数DPermit作为海洋环境混凝土耐久性无损检测的最优指标.在此基础上,进一步建立了混凝土耐久性无损检测指标控制标准,为海洋环境混凝土耐久性现场无损检测技术的应用和标准化研究提供了参考.

A durability study was conducted on RCM（Rapid Chloride Migration） method,Permit ion migration method and AUTOCLAM method,the influence of different water-cement ratios,admixtures and templates were taken into consider. The relationship between DPermitand DRCM measured by Permit method and RCM method respectively was established and compared with the coefficient of air permeability and water permeability measured by AUTOCLAM method.The results show that both air permeability coefficient and water permeability coefficient have large discreteness. The change rules of RCM method and Permit method are basically the same,but DPermithas higher successful rate and better numerical stability. From comprehensive analysis of the operability of test process and the stability and accuracy of test results,DPermitmeasured by Permit method was finally determined as the nondestructive testing optimum index of durability of concrete in marine environment. On the basis,the control standard of nondestructive testing index of durability of concrete is established,which provide reference for the application of nondestructive testing technology and standardization study of durability of concrete in marine environment.