The cementitious composites using calcium silicate slag as partial cement
The cementitious composites using calcium silicate slag as partial cement
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以硅酸钙渣为部分水泥的胶凝复合材料
DOI：
10.1016/j.jclepro.2020.120514
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发表时间：
2020-05-20
影响因子：
11.1
通讯作者：
Yang, Zhijie
中科院分区：
文献类型：
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作者：
Yan, Changwang;Zhao, Hongwei;Yang, Zhijie
硅酸钙渣（CSS）是从高铝粉煤灰中提取氧化铝而产生的工业废渣。CSS与水泥一起被用作水泥材料，以减少土地污染并有效利用工业废物。研究了CSS替换率和龄期对胶凝复合体系抗压强度和水化程度的影响，并建立了预测胶凝复合体系抗压强度的模型。结果表明：随着CSS替代率的增加，胶凝复合材料的强度和水化程度略有下降；当替代率不超过50%时，胶凝复合材料的强度仍可达到32.5 MPa标准。显微组织分析表明，无定形C-(A)- s - h、片状CH和少量棒状钙矾石（如AFt）使样品结构致密。采用响应面法（RSM）对胶凝复合材料的抗压强度进行了计算，结果表明响应面法能较准确地预测胶凝复合材料的抗压强度。本研究表明，CSS可以作为水泥的替代品，从而为CSS的大规模利用提供了一种有效的方法。(C) 2020 Elsevier Ltd.版权所有。
Calcium silicate slag (CSS) is an industrial waste residue produced by the extraction of Al2O3 from highalumina fly ash. CSS, along with cement, is used as a cementing material to reduce land pollution and to utilize industrial waste effectively. The effects of the replacement rate and age of CSS on the compressive strength and hydration degree of the cementitious composite system are examined, and a model for predicting compressive strength is constructed. Results show that the strength and hydration degree of the cementitious composites decrease slightly with the increase in the replacement rate of CSS. When the replacement rate did not exceed 50%, the strengths of the cementitious composites could still reach the 32.5 MPa standard. Microstructural analysis indicated that amorphous C-(A)-S-H, flaky CH, and a small amount of rod-like ettringite (e.g., AFt) made the sample structure compact. The compressive strengths of the cementitious composites were calculated using the response surface method (RSM), and the results show that RSM could predict the compressive strength of cementitious composites accurately. This study shows that CSS can be used as a substitute for cement, thereby providing an effective method for the large-scale utilization of CSS. (C) 2020 Elsevier Ltd. All rights reserved.