文献类型：期刊文献

英文题名：The impact of industrial waste on hydration behavior, mechanical performance, and water resistance of magnesium oxychloride cement

作者：Feng, Yun[1,3] Alves, Zelia[2] Peng, Limin[1] Novais, Rui M.[2]

第一作者：Feng, Yun

通信作者：Peng, LM[1];Novais, RM[2]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Univ Aveiro, Aveiro Inst Mat, Dept Mat & Ceram Engn, CICECO, Campus Univ Santiago, P-3810193 Aveiro, Portugal;[3]Beijing Forestry Univ, Coll Mat Sci & Technol, Beijing 100083, Peoples R China

年份：2025

卷号：489

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：;EI(收录号：20252518628158);Scopus(收录号：2-s2.0-105008178848);WOS:【SCI-EXPANDED(收录号:WOS:001514213300002)】；

基金：This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020) , UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020) & LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020) , financed by national funds through the FCT/MCTES (PIDDAC) .

语种：英文

外文关键词：Red mud; Biomass fly ash; Magnesium oxychloride cement; Isothermal calorimetry; Water resistance

摘要：Magnesium oxychloride cement (MOC) is a low-carbon alternative to traditional Portland cement, however its poor water resistance limits practical application. This study investigates the use of massively produced industrial waste materials: red mud, biomass fly ash, and copper slag, as supplementary cementitious materials (SCM) to improve the water resistance of MOC. A commercial precursor, metakaolin, was included for comparison. This work reports, for the first time, the systematic exploration of these underutilized SCM, particularly biomass fly ash, to synergistically enhance both mechanical strength and water resistance of MOC composites. The hydration behavior, reaction kinetics, and microstructural evolution were comprehensively analyzed via isothermal calorimetry, XRD, SEM, and TG. Results reveal that the incorporation of 20 wt% biomass fly ash optimizes hydration reactions, leading to a compressive strength of 44.29 MPa after 7 days of curing. The softening coefficient of MOC with 30 % biomass fly ash is 45 %. Metakaolin exhibited comparable performance, with even greater water resistance at higher dosages. The formation of secondary M-S-H gel phases and densified microstructures were found to be key mechanisms behind the compressive strength and water resistance. These findings provide new insights into sustainable MOC formulation using industrial by-products, offering a practical strategy for improving material performance while supporting circular economy and carbon reduction in the construction sector.