Abstract
The durability damage of concrete structures in the actual engineering environment is often the result of the interaction of the load and the environment, climate and other multiple factors. In this paper, the test researches were carried out on the concrete mass and dynamic elastic modulus under the effects of sustained loading, sulfate attack and dry-wet circulation, and the test phenomenon and results were discussed and analyzed. Then this paper proposed the durability damage model of the concrete under the effects of sustained loading, sulfate attack and dry-wet circulation considering the compressive stress level, the sulfate solution concentration and the age of corrosion as test factors, and the rationality of the model was discussed.
Highlights
Neville [1] considered that it needs to recognize the importance of the interaction of multiple factors in the concrete durability theoretical research and practical engineering application
Tixier et al.[2,3] established the model to calculate the expansion of concrete which was under sulfate attack applying the physical and chemical mechanics
Kuhl et al.[7,8] considered the precipitation of calcium in the concrete as chemical damage variable and combined with the concrete mechanical damage, and established the chemical mechanical damage model to calculate the deterioration of mechanical properties.But a large number of unknown parameters needed to be identified in these models, and these key material parameters were determined empirically in the past
Summary
Neville [1] considered that it needs to recognize the importance of the interaction of multiple factors in the concrete durability theoretical research and practical engineering application. One method is that the damage models were established considering chemical ion corrosion, and the required parameters were determined through the analysis of test results. The mathematical statistical method about the evolution of concrete durability damage based on the test results is widely applied.Schneider and Chen [9] conducted the compressive strength tests of the concrete members in different bending stress levels which were in the ammonium sulfate and ammonium nitrate solution with different solubility, through the regression analysis of the test data, they supposed the model of concrete time varying compressive strength considering the load and sulfate attacks. This paper conducted experimental study on the concrete damage under different experimental conditions, providing the basis for proposing a concrete damage calculation model under the effects of sustained loading, sulfate attack and dry-wet circulation
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