Open Access

ARTICLE

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

Tao Li^1,2,*, Sheliang Wang², Fan Xu^2,*, Binbin Li³, Bin Dang¹, Meng Zhan⁴, Zhiqi Wang⁵

1 College of Urban, Rural Planning and Architectural Engineering, Shangluo University, Shangluo, 726000, China
2 School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China
3 Key Laboratory of Structure Engineering and Earthquake Resistance, Ministry of Education (XAUAT), Xi’an University of Architecture and Technology, Xi’an, 710055, China
4 College of Architecture Engineering, Huanghuai University, Zhumadian, 463000, China
5 China Construction Third Engineering Bureau Green Industry Investment Co., Ltd., Wuhan, 430070, China

* Corresponding Authors: Tao Li. Email: ; Fan Xu. Email:

(This article belongs to this Special Issue: Recycled Concrete Towards a Sustainable Society)

Journal of Renewable Materials 2021, 9(8), 1413-1432. https://doi.org/10.32604/jrm.2021.012744

Received 11 July 2020; Accepted 26 January 2021; Issue published 08 April 2021

Abstract

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 microscopically. Firstly, according to the experimental data, the damage constitutive and related damage parameters of TRC were theoretically established by Weibull probability distribution function. Secondly, the comprehensive damage parameter b under different working conditions was studied. Finally, the damage mechanism was formed by EDS and SEM. The results showed that the damage constitutive model based on Weibull probability distribution function was in good agreement with the experimental results. Under each carbonization period, the b first decreased and then rose with the increase of tailings content. When 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 RAC. The 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 density. Therefore, 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.

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