Performance Enhancement of Recycled Concrete Aggregates through Carbonation
Performance Enhancement of Recycled Concrete Aggregates through Carbonation
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DOI：
10.1061/(asce)mt.1943-5533.0001296
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发表时间：
2015-11
影响因子：
3.2
通讯作者：
Jiake Zhang;C. Shi;Yake Li;Xiaoying Pan;C. Poon;Zhaobin Xie
中科院分区：
文献类型：
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作者：
Jiake Zhang;C. Shi;Yake Li;Xiaoying Pan;C. Poon;Zhaobin Xie
摘要 附着在天然骨料上的水泥浆体对再生混凝土骨料（RCA）的质量具有显着影响，因为它通常比天然骨料具有更高的孔隙率和更低的强度。这项工作试图通过附着的水泥浆的碳化来提高 RCA 的质量。在碳酸化反应过程中，CO2与Ca(OH)2和水合硅酸钙(C─S─H)反应生成CaCO3和硅胶，填充了附着的水泥浆体的孔隙。因此，碳酸化增加了 RCA 的密度，并降低了吸水率和破碎值。因此，它提高了再生骨料砂浆的流动性和抗压强度，并降低了干燥收缩。
AbstractThe cement paste attached to natural aggregates has a significant effect on the quality of recycled concrete aggregates (RCAs) because it usually has higher porosity and lower strength than natural aggregates. This work attempted to improve the quality of RCAs through carbonation of the attached cement paste. During carbonation reactions, CO2 reacted with Ca(OH)2 and calcium silicate hydrate (C─S─H) to form CaCO3 and silica gel, which filled the pores in the attached cement paste. Thus, carbonation increased the density, and decreased the water absorption and crushing values of the RCAs. It, thus, increased the flowability and compressive strength and decreased drying shrinkage of the recycled aggregate mortars.