Abstract
An experimental study on the uniaxial tensile property of concrete exposed to the acid rain environment was carried out. Acid rain with pH level of 1.0 was deposed by the mixture of sulfate and nitric acid solution in the laboratory. Dumbbell-shaped concrete specimens were immersed in the simulated acid rain completely. After being exposed to the deposed mixture for a certain period, uniaxial tensile test was performed on the concrete specimens. The results indicate that elastic modulus, tensile strength, and peak strain have a slight increase at the initial corrosion stage, and with the extension of corrosion process, elastic modulus and tensile strength decrease gradually, while the peak strain still increases. It is found that the compressive strength is more sensitive than the tensile strength in aggressive environment. Based on the experimental results, an equation was proposed to describe the ascending branch of the stress-strain curve of the concrete corroded by acid rain.
Highlights
Acid rain has become an issue of widespread concern in Asia, and it was first recognized as a potential environmental pollution problem in the late 1970s and early 1980s
The critical value of the compressive strength degradation ratio is larger than that of the tensile strength degradation ratio, and Dfc showed greater decline than Dft, this indicates that the compressive strength is more sensitive to aggressive environment than the tensile strength, but this conclusion needs to be further validated due to limited number of specimens in this paper
At the initial stage, the 3 major mechanical property indexes, uniaxial tensile strength, peak strain, and elastic modulus increase gradually, with the increasing of corrosion duration, the uniaxial tensile strength and elastic modulus decrease, but the peak strain continues to increase, which shows that the damage increases with the corrosion duration
Summary
Acid rain has become an issue of widespread concern in Asia, and it was first recognized as a potential environmental pollution problem in the late 1970s and early 1980s. It was an increasing problem in China during the last decades [1,2,3,4]; one third of China’s land mass was affected by acid rain. Some ways have been used to reduce acid rain, the acid rain region in China even continue to expand, the property of the corroded concrete have become to be a critical issue and attracted a lot of researchers worldwide [6,7,8,9,10,11,12]. A series of tests, including weighing, compressive tests, and tensile tests were conducted at different conditioned stages to determine mass loss, compressive strength, and tensile properties
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