Testing and Evaluation on the Chloride Ion Penetrability of Concrete under Compressive Stress

Abstract

Chloride ion penetrability of concrete under and after compressive stress was tested in the paper. Four stress level (the ratio of the pressure load and ultimate load) was set: 20%, 40%, 60% and 80%. Chloride ion penetrability of concrete was tested using a rapid test method of electric flux. The results indicated that the electric flux of concrete under compressive stress was influenced by stress level, and the electric flux of concrete was first decreased and then upward with stress level increasing. The electric flux of concrete of different strength grade was sensitivity to compressive stress differently, and the lower the strength grade of concrete, the high sensitivity to compressive stress. The electric flux of concrete after compressive stress was related with crack recovery, and there was a significant effect of only more than 60% stress level on the electric flux of concrete. The evaluation of chloride ion penetrability of concrete structure should take into account the loads.

Study on the deterioration characteristics of aeolian sand concrete under the coupling effect of multiple factors in harsh environments

“…Studied the multi-scale analysis theory of concrete diffusion coefficient under mechanical stress, proposed a multi-scale analysis model, predicted the chloride ion diffusion rate of concrete under mechanical stress, and evaluated the quantitative relationship between the apparent diffusion coefficient of concrete and mechanical stress (here is volume strain), as well as the current porosity of cement paste and ITZ; the research on the characteristics of ultrasonic wave velocity of concrete under the action of Ling Zhang [ 9 ] and other stresses points out that under the same loading conditions, the ultrasonic velocity has an increasing trend with the increase of age for C10 and C20 concrete samples, but for C30, C35, C40 and C45 concrete samples, the overall growth trend of velocity is not obvious; Guo Jun liu et al [ 10 ]. Studied the failure criterion of concrete under multiaxial stress, analyzed its limitations, and proposed the research direction of concrete strength failure criterion; Yu Chuan Jiang et al [ 11 ]. Tested and evaluated the chloride permeability of concrete under compressive stress, pointing out that the electric flux of concrete under compressive stress is affected by the stress level.…”