文献类型：期刊文献

英文题名：Upcycling of construction spoil powder as partial cement replacement for sustainable cement-based materials: Properties and modification

作者：Wu, Huixia[1,2];Yao, Pengpeng[3];Yang, Dingyi[3];Wang, Changqing[4];Shen, Jiaxin[3];Ma, Zhiming[3]

机构：[1]Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China;[2]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[3]Yangzhou Univ, Coll Architectural Sci & Engn, Yangzhou 225127, Peoples R China;[4]Shanghai Univ, Dept Civil Engn, Shanghai 200444, Peoples R China

年份：2022

卷号：369

外文期刊名：JOURNAL OF CLEANER PRODUCTION

收录：SCI-EXPANDED(收录号：WOS:000841081300002)、、EI(收录号：20223312561192)、Scopus(收录号：2-s2.0-85135712075)、WOS

基金：The authors gratefully acknowledge substantial support of ongoing projects titled National Natural Science Foundation of China (52008364) , Natural Science Foundation of Jiangsu Province (BK20200957) and Key Research and Development Program of Jiangsu Province (BE2022776) .

语种：英文

外文关键词：Construction spoil; Waste spoil powder; Sustainable cement -based materials; Properties evaluation; Performance modification

外文摘要：Construction spoil accounts for the main part of construction and demolition waste, the effective recycling of which has been paid less attention to by previous investigations. This work investigated the feasibility of utilizing waste spoil powder (WSP) ground from construction waste as partial cement replacement for preparing sustainable mortar, and a 800-1200 degrees C heat treatment was employed to modify the properties of WSP. The WSP with an irregular particle shape contains massive inert quartz, anorthite and kaoline, and mixing WSP reduces the hydration reaction and enlarges the pore structure of cement-based materials. However, new metakaolin and amorphous components are generated in heat-treated WSP, and heat-treated WSP has higher activity than untreated WSP; besides, the paste with heat-treated WSP has finer pore size than the paste with untreated WSP. The drying shrinkage of mortar increases by intermixing WSP; but the mix of heat-treated WSP reduces the drying shrinkage, and the maximum shrinkage of mortar with 30% WSP after 1200 degrees C treatment is 25.0% lower than that of plain mortar. Incorporating WSP reduces the mechanical strength and meanwhile increases the water absorption of mortar, but the mortar including heat-treated WSP has higher strength and lower water absorption than the mortar with untreated WSP. Decreasing WSP particle size further improves the properties of WSP blended mortar. It is noticed that incorporating heat-treated WSP together with active mineral admixture can prepare sustainable mortar with similar mechanical strength and lower water absorption than plain mortar without WSP.