![]() The drying operation in this test may withdraw the free water that is mechanically held in concrete, and some of the water from the colloidal cementitious gel. The applied load performed a more important role on the service life prediction of concrete structure. This Standard sets out the procedure for determining the immersed absorption (Ai) and, if required, boiled absorption (Ab) and apparent volume of permeable voids (AVPV) in hardened concrete. These results provide important new insights into the permeability of concrete under a coupling effect. MIP results confirmed that stress played an important role in the water absorption and chloride penetration of concrete under the coupling effect. ![]() Outside part of concrete showed higher permeability and chloride content than inside part. Water and chloride ions penetration increased sharply when freeze–thaw cycles was over 100 times, which is different with samples without load. Concrete samples with 0.3 f c showed the best water and chloride penetration resistance under the coupling effect, followed by samples with 0.5 f c and 0 f c, which is consistent with the conclusion that under load only. In this study, ordinary cube concretes (C30 and C50, while w/c = 0.53 and 0.35 respectively) underwent a coupling effect of pressure load with stress ratio of 0, 0.3 and 0.5 and freeze–thaw cycles, following by capillary water absorption test and chloride penetration test. In cold coastal area, the destruction mechanism of reinforced concrete structures is mainly governed by a combination of factors such as self-loading, freeze–thaw and chloride erosion.
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