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Study on Carbonation damage Constitutive Curve and Microscopic damage Mechanism of Tailing Recycled Concrete

Journal of Renewable Materials 2021年第8期9卷 1413-1432页

作者： Tao Li Sheliang Wang Fan Xu Binbin Li Bin Dang Meng Zhan Zhiqi Wang College of Urban Rural Planning and Architectural EngineeringShangluo UniversityShangluo726000China School of Civil Engineering Xi’an University of Architecture and TechnologyXi’an710055China Key Laboratory of Structure Engineering and Earthquake Resistance Ministry of Education(XAUAT)Xi’an University of Architecture and TechnologyXi’an710055China College of Architecture Engineering Huanghuai UniversityZhumadian463000China China Construction Third Engineering Bureau Green Industry Investment Co. Ltd.Wuhan430070China

To improve the resource utilization of recycled aggregate concrete(RAC)and make use of the unique pozzolanic activation characteristics of iron ore tailing(IOT),the constitutive curves of tailing recycled concrete(TRC)before and after carbonization were analyzed theoretically,experimentally and ***,according to the experimental data,the damage constitutive and related damage parameters of TRC were theoretically established by Weibull probability distribution ***,the comprehensive damage parameter b under different working conditions was ***,the damage mechanism was formed by EDS and *** results showed that the damage constitutive model based on Weibull probability distribution function was in good agreement with the experimental *** each carbonization period,the b first decreased and then rose with the increase of tailings *** its content was 30%,the b values of TRC were minimized,which were 22.14%,20.99%,25.39%lower than those of NAC,and 41.09%,34.89%,35.44%lower than those of RAC,indicating that IOT had a relatively good optimization effect on the constitutive curve of *** microscopic analysis results also proved that the IOT addition with a proper amount would improve the matrix structure of RAC and increased its compactness,but when the content was higher,it would also cause harmful cracks in its matrix structure and reduced its ***,the optimal tailing content was about 30%.This paper provided a new method for damage constitutive calculation and analysis of TRC before and after carbonization.

关键词： Tailings recycled concrete carbonation damage constitution damage mechanism

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