ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 67, (4) 458 - 467 (2023)

Ning Wei 1, Ding Yahong 2, Lv Xiuwen 1, Zhang Meixiang 3
1 School of Traffic Engineer, Huanghe Jiaotong University, Jiaozuo, 454950, China
2 School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China
3 School of Architectural Engineering Xinyu University, Xinyu, Jiangxi,338004, China

Keywords: Recycled fine aggregate, Accelerated carbonation, CO₂ mass absorption rate, Water absorption, Flowability, Compressive strength

To solve the problem of performance degradation of recycled fine aggregate (RFA), this paper adopted accelerated carbonation with saturated lime water solution (CH) pre-soaking, the crushing value, water absorption rate and apparent density were investigated. The carbonation products and microstructure were characterised by thermal analysis (TG), X-ray diffraction, and scanning electron microscopy (SEM). The results indicate that the calcite produced by the accelerated carbonation is closely packed and filled in the microcracks in the RFA, which reduces its water absorption and crushing value, and increases its apparent density; the RFA pre-treated with the CH solution had a higher CO₂ mass absorption rate. Accelerated carbonation can effectively improve the compressive strength of recycled mortar, but it will reduce the flowability of recycled mortar.

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doi: 10.13168/cs.2023.0045
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