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《Sichuan Building Science》 2017-04
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Ultrasonic damage model of different types of concrete freeze-thaw cycles

CHEN Shengping;SU Zihao;School of Civil Engineering and Architecture,Hubei University of Technology;  
For ordinary concrete,steel fiber concrete and steel fiber reinforced concrete with slag and fly ash were fast freeze-thaw experiment,the effects of different types of concrete freeze-thaw damage apparent characteristics,analyzed the mechanism in the process of freezing and thawing of steel fiber and slag fly ash in concrete. By fitting analysis of experimental parameters was established the dynamic elastic modulus and ultrasonic wave velocity as the variables of concrete freeze-thaw damage model. The experimental results show that steel fiber can improve the concrete frost resistance; fly ash can improve the impermeability of concrete,slow in the process of freezing and thawing loss of its quality; by comparing the experimental data analysis the high precision of the damage model with ultrasonic velocity as the variable,the data detection is convenient and quick,and the specific dynamic elastic modulus method is more suitable for the evaluation of freeze-thaw damage in the actual work.
【Fund】: 湖北省自然科学基金(2012FFB00607)
【CateGory Index】: TU528
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