Abstract
To study the influence of different water–binder ratios on the corrosion, permeability, and freezing properties of concrete, we produced different strengths of concrete with respective water–binder ratios of 0.32, 0.38, 0.50, and 0.66. The corrosion resistance of the concrete was studied via three corrosion methods: full immersion, half immersion, and dry and wet cycles. The impermeability and frost resistance of concrete with different water–binder ratios were tested and analyzed. The test results show that the corrosion modes in order from strong to weak were dry and wet cycles, half soaking, and full soaking. The relative dynamic elasticity modulus and freeze–thaw index were used to evaluate the frost resistance of concrete based on the analysis of three indices of frost resistance. To study the internal mechanism of corrosion of concrete with different water–binder ratios, microscopic pore structure testing of the concrete was conducted using a Micromeritics AutoPore IV 9500 Series instrument. The porosimeter studies show that the smaller the water–binder ratio, the more small pores and the denser the concrete. The smaller the water–binder ratio, the higher the strength and the better the corrosion, permeability, and frost resistance.
Highlights
Due to the different levels of importance of engineering structures and service life, the strength grades of concrete structures are different in actual projects
Research results from Dehwah et al (2002) showed that the rate of chloride-induced reinforcement corrosion in concrete specimens exposed to sodium chloride plus magnesium sulfate solutions was higher than that in concrete specimens exposed to sodium chloride plus sodium sulfate solutions
The relative dynamic elastic modulus and freeze– thaw index were very sensitive to the frost resistance of concrete
Summary
Due to the different levels of importance of engineering structures and service life, the strength grades of concrete structures are different in actual projects. Experimental results from Hai-long et al (2012) showed that damage to concrete is caused by the expansion of chemical reaction products and crystallization of sodium sulfate under a sodium sulfate and wet–dry cycle environment. Liangxue et al (2016) reported that the final strengths were only 82.84% and 90.22% in specimens which were kept in a normal environment and immersed in distilled water after aging for 360 days, respectively.Many studies have researched concrete expansion and cracking due to sulfate exposure (Aye and Oguchi 2011; Gao and Zou 2015; Rozière et al 2009), but due to the different research objectives and the different test environments, different test schemes and evaluation indices have been selected to study the performance of concrete subjected to sulfate attack (El Maaddawy and Soudki 2007). The inner influence mechanism of corrosion/permeability/frost was determined by analyzing the microstructure
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