1 School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China 2 State Key Laboratory of Green Building in Western China, Xi’an University of Architecture and Technology, Xi’an 710055, China
Abstract: Reinforced concrete structures in marine environment suffer from chloride erosion for a long time, which leads to the decline of durability on structures. Therefore, the resistance ability of materials to chloride ion erosion plays an important role in the durability of concrete structures. As a nondestructive testing technology, the resistivity can be used to characterize the chloride penetration resistance of concrete. In this study, the resistivity of coral aggregate concrete (CAC) and ordinary concrete (OC) were measured by improved alternating current test method, and the porosity of CAC with different mineral admixtures was measured, so as to obtain the mechanism that mineral admixtures could improve the chloride penetration resistance of CAC. The results show that fly ash, silica fume and slag affect the resistivity of CAC and improve the anti-chloride ion permeability of CAC. When the content of admixture in CAC is 10%, the resistivity of CAC with silica fume is 3.71 times and 2.02 times that of fly ash and slag. At the same content of admixture, silica fume has the greatest influence on the CAC resistivity, followed by slag and fly ash. Under the same strength, the CAC resistivity is less than that of OC, about 0.6 times that of OC. The porosity of CAC is 2.0—3.1 times that of OC. According to the CAC resistivity in 365 days, temperature, humidity, water-binder ratio and admixtures were considered, and the resistivity model of modified CAC was finally established.
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2022, Vol. 36 
