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Mechanical Property Deterioration Model for Concrete in Environment with Freezing-thawing

ZHU Jin-peng1,LI Shu-cai1,LIU Xian-bo2,LIU Min2 (1.Geotechnical and Structural Engineering Research Center,Shandong University,Jinan 250061,Shandong,China;2.Shandong Road & Bridge Construction Co.,Ltd.,Jinan 250014,Shandong,China)  
Based on the freezing-thawing test and micro-mechanics of concrete,the mechanical properties of concrete after freezing-thawing were studied,and the strength reduction model and elastic modulus reduction model were built with the changes of freezing-thawing cycles of concrete.In aspects of freezing-thawing test,the compressive tests of concrete specimens and mortar specimens which were made according to the ratio of concrete suffering 100,200 and 300 cycles of freezing-thawing were completed.Using the large static-dynamic triaxial test system for concrete,the influences of cycles of freezing-thawing on the compressive strength of concrete,elastic moduli and stress-strain relationships were tested.In aspects of micro-mechanics,examination of the concrete specimen was numerically simulated.To consider the non-uniformity of the various components,the nature of the material of the various components was assigned in accordance with the Weibull distribution.In order to reflect the impact of freezing-thawing to concrete,the strength and elastic modulus of mortar specimens were both assigned according to the results of mortar freezing-thawing test.The results show that this method can offer references for further research on deterioration mechanism and calculation model of reinforced concrete structures in actions of freezing-thawing cycles.
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