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J4  2012, Vol. 46 Issue (7): 1255-1261    DOI: 10.3785/j.issn.1008-973X.2012.07.016
Damage mechanism of concrete deteriorated by sulfate attack
in wet-dry cycle environment
WANG Hai-long1, DONG Yi-sen1,2, SUN Xiao-yan1, JIN Wei-liang1
1. Department of Civil Engineering, Zhejiang University, Hangzhou 310058,China;
2. Greentown Architectural Design Limited Company, Hangzhou 310027, China
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Some experiments were conducted to simulate the deterioration of concrete under sodium sulfate and wet-dry cycle environment in order to reveal the damage mechanism of sulfate attack. The damage development was evaluated by apparent characteristics of attacked concrete, weight changes over erosion time, profile of sulfate ions in concrete, erosion depth, degradation of compressive and splitting tensile strengths with erosion time, and deformation over attacked time. The parameters’ effects such as the mass fraction  of sulfate solution and the attacked time on the damage accumulation were analyzed. According to the SEM images, the damage mechanism was achieved by analyzing the microstructures of deteriorated concretes at different erosion periods. Experimental results show that the damage of concrete under sodium sulfate and wet-dry cycle environment is caused by the expansion of chemical reaction products and crystallization of sodium sulfate. The weight, strengths and ductility of concrete increase with the increase of erosion time due to the filling effect of crystals at the beginning periods. However, with the increase of erosion time, the combined expansions of ettringite, gypsum and crystal of sodium sulfate decahydrate (Na2SO4·10H2O) accelerate the evolution of damage, which results in a reduction of concrete strength and increases of weight loss and brittleness. Compared with the compressive strength, the tensile strength is more sensitive to the sulfate attacked damage due to the superimposed effect of tensile stress.

Published: 01 July 2012
CLC:  TU 528.1  
Cite this article:

WANG Hai-long, DONG Yi-sen, SUN Xiao-yan, JIN Wei-liang. Damage mechanism of concrete deteriorated by sulfate attack
in wet-dry cycle environment. J4, 2012, 46(7): 1255-1261.

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