CO<sub>2</sub>养护煤矸石粗骨料性能研究

doi:10.11896/cldb.23030104

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Abstract The disadvantage of coal gangue coarse aggregate (CGCA) such as high crushing index, high water absorption and poor interface adhesion with concrete matrix limit its application in civil engineering.Improving the performance of CGCA is the premise of increasing its application rate. CO₂ curing is to improve the structure of cement paste by the reaction of CO₂ with cement hydration product Ca(OH)₂, which can reduce energy consumption and improve the properties of aggregate. In this work, the effects of curing temperature (20°C/40°C), CO₂ concentration (65%/95%) and curing time (2 h/4 h/6 h) on the apparent density, water absorption, crushing index and firmness of CGCA wrapped by cement-based materials and cement + epoxy resin materials were studied. And the chemical composition and interface transition zone morphology were analyzed. Moreover, the carbon fixation rate of CGCA after CO₂ curing was measured. A high strength shell is formed on the surface of the wrapped CGCA by CO₂ curing, and the CGCA performance is improved. Increasing the curing temperature, CO₂ concentration and curing time, the apparent density can be increased by 0.04%—3.24%, and the water absorption can be reduced by 6.51%—14.29%. The crushing index and firmness index of wrapped CGCA can be improved from grade II to grade I aggregate standard. After CO₂ curing, the carbon fixation rate can reach up to 20.07%, which improves the aggregate performance and reduces the CO₂ emission. Due to the high content of Ca(OH)₂ in the cement wrapped layer, the interface is tightly bonded after CO₂ curing, and the microstructure is more compact. Therefore, the improvement effect of cement wrapping is the most significant. As a comparison, the improvement effect of cement + 5% silica fume is weak, and the improvement of cement + 10% fly ash and cement + epoxy resin is the worst.

Key words： coal gangue,CO₂ curing,crushing index,firmness index,interfacial transition zone CO₂ uptake ratio

Published: 25 July 2024 Online: 2024-08-12

CLC number:

TU528

Fund:National Natural Science Fund for Excellent Young Scholars (52222806), National Natural Science Foundation of China (52078414), Shaanxi Province Science Fund for Distinguished Young Youths (2022JC-20), Key Project of Scientific Research Program of Shaanxi Provincial Education Department (20JY037), Study on the Mechanism of Salt Corrosion and the Application of Key Technology to Improvement the Performance of Concrete Covered Structures in Caverns (No.5), Key Project of Innovation Fund for Doctoral Students in Xi'an University of Architecture and Technology (2021XYBPY004).

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	Articles by authors
	CAO Mengyuan
	YU Suhui
	YUAN Jian
	WANG Wei
	ZHANG Shaohui
	WANG Yan

Cite this article:

CAO Mengyuan,YU Suhui,YUAN Jian, et al. Research on Properties of Coal Gangue Coarse Aggregate Cured by CO₂[J]. Materials Reports, 2024, 38(14): 23030104-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23030104 OR http://www.mater-rep.com/EN/Y2024/V38/I14/23030104

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