Study on Corrosion and Destroy Mechanism of Concrete under Acidic Conditions
Z. G. Yu, R. R. Chen, B. Mtei
†School of Architecture Engineering, Chongqing Vocational Institute of Engineering, Chongqing 402260, China,
‡School of Civil Engineering, Chongqing University, Chongqing 400045, China
§Basic Construction Command, Chongqing Medical University, Chongqing 400016, China
††The Nelson Mandela African Institution of Science and Technology, Arusha, Tanzania
ABSTRACT: In this research, the concrete specimens were prepared from C20 to C60, coupled effects of sulfate madefaction and dry-wet cycle were used to accelerate the rate of sulfate attack, and compressive strength of each specimen was tested. The results showed that, compared to the same age of water curing specimens, the strength of the dry-wet cycle specimens increased 4%~10% within 30 days. After 30 days, with the age increased, strength began to decrease. In 120 days, C20 decreased 16.3%, C30 decreased 23.1% and C40 decreased 18.9%, C50 and C60 decreased about 7%. The higher strength grade of concrete is, the better the performance of concrete in sulphate corrosion is.
Keywords : Dry-wet cycle; Sulfate; Coupling; Compressive strength
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