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Liu J.,Nanjing Southeast University | Deng J.,Nanjing Southeast University | Qin H.,Nanjing Southeast University | Zhang P.,Jiangsu Key Laboratory of Civil Engineering Materials | And 2 more authors.
Materials Research Innovations | Year: 2015

Marine concrete with excellent salt corrosion resistance was cast, followed by ultrasonic testing technology, chemical analysis of free chloride ion and calculation of the chloride ion diffusion coefficient to investigate the degradation of the marine concretes subjected to wetting-drying cycles and bending loads during their exposure to a marine environment. Additionally, an indoor accelerated corrosion test was conducted. The effects of the water-to-binder ratio, mineral admixtures, bending loads and other factors on the durability of the marine concrete were investigated, and initial primary correlation between marine exposure conditions and the indoor accelerated corrosion test was established based on the diffusion coefficient of chloride ions. © W. S. Maney & Son Ltd 2015. Source


Yan X.,Nanjing Southeast University | Yan X.,Jiangsu Key Laboratory of Civil Engineering Materials | Zhang P.,Nanjing Southeast University | Zhang P.,Jiangsu Key Laboratory of Civil Engineering Materials | And 6 more authors.
Advances in Science and Technology of Water Resources | Year: 2016

In order to study the influence of concrete strength grade, volumes of fly ash and slag powder, and air-entraining content on the frost-salt resistance of concrete, an accelerated freeze-thaw test of concrete in salt solution was carried out. The correlation between the air-entraining contents of fresh concrete and hardened concrete was validated through measurement of bubble parameters of hardened concrete. The variation of surface characteristics, relative dynamic modulus of elasticity, and cumulative amount of spalling of concrete with the number of freeze-thaw cycles were investigated. The influence of concrete strength grade, volumes of fly ash and slag powder, and air-entraining content on the frost-salt resistance of concrete was examined. The results shows that a higher concrete strength does not always improve the frost-salt resistance, the air-entraining content is the decisive factor influencing the frost-salt resistance of medium-and low-strength grade concrete, and the volumes of fly ash and slag powder should be controlled within an appropriate range. © 2016, Editorial Board of Advances in Science and Technology of Water Resources, Hohai University. All right reserved. Source

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