The Indexes for Durability Degradation of Concrete in Acidic Water Environment

【Author】

Beixing Li;Laohu Cai;Wei Wang;Ningning Wang;

【Abstract】

<正>To provide the quantitative evaluation criteria for concrete durability in acidic water environment,the theoretical research was carried out:Firstly,defined the acidification index and compressive strength degradation index of concrete;Secondly,Studied on the law of acidification;Lastly,calculated the mechanical properties data in failure limit state of concrete,in which the acidification depth attain to protection layer for steel bar, then,performance degradation index was obtained.Results show that the compressive strength degradation indexes for concrete durability failure limit in acid water and acid water-wet and dry cycles environments were 74%and 80%respectively;There was close relationship between durability degradation indexes of concrete and service environment. Originality Adopt a new method,carry out the research on the quantitative design about forst durability of concrete in acid water environment,which is based on the law of acidification.And corresponded to the acidification depth index,obtain the performance degradation index. The quantitative research on the durability degradation indexes of concrete is a complicated system,there was close relationship between durability degradation indexes of concrete and service environment.Most of the research did not consider the variability of environmental factors in the erosion process,only carrying out qualitative research on the durability degradation indexes of concrete.In order to carry out better research on the durability degradation indexes of concrete,this paper not only carrying out qualitative and quantitative research but also considering the variability of environmental factors. However,this method not only providing quanlitalive basis for life prediction of concrete,but also helping to make the transition from traditional strength design to service life design.

【Keywords】

concrete;;durability;;acidification index;;degradation index;;quantitative research

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