文献类型：期刊文献

英文题名：Reusing recycled powder as eco-friendly binder for sustainable GGBS-based geopolymer considering the effects of recycled powder type and replacement rate

作者：Liu, Miao[1];Wang, Changqing[2,4];Wu, Huixia[3];Yang, Dingyi[1];Ma, Zhiming[1,4]

机构：[1]Yangzhou Univ, Coll Civil Sci & Engn, Yangzhou 225127, Peoples R China;[2]Shanghai Univ, Dept Civil Engn, Shanghai 200444, Peoples R China;[3]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[4]Tongji Univ, Dept Struct Engn, Shanghai 200092, Peoples R China

年份：2022

卷号：364

外文期刊名：JOURNAL OF CLEANER PRODUCTION

收录：SCI-EXPANDED(收录号：WOS:000821828100003)、、EI(收录号：20222512255506)、Scopus(收录号：2-s2.0-85132217038)、WOS

基金：The authors gratefully acknowledge substantial support of ongoing projects titled National Natural Science Foundation of China (52008364) and Natural Science Foundation of Jiangsu Province (BK20200957) and Postgraduate Research & Practice Innovation Pro- gram of Jiangsu Province (KYCX22_3485) .

语种：英文

外文关键词：Recycled powder; Sustainable geopolymer; Micro-characteristics; Shrinkage performance; Mechanical and transport properties

外文摘要：Utilizing recycled powder (RP) as binder for geopolymer reduces the construction waste and contributes to the development of sustainable geopolymer materials, but the effects of RP type and replacing rate on the characterization of sustainable geopolymer with RP received less consideration in previous investigations. Therefore, this investigation showed the upcycling of various RPs as an eco-friendly binder for sustainable GGBS-based geopolymer, and the micro-characteristics, mechanical strength and transport performance of geopolymer containing RP up to 100% were measured. The results indicated that RP from various construction waste mainly consisted of hydrated products, un-hydrated cement particle, quartz and calcite. Incorporating high-volume RP enlarged the pore structure of GGBS-based geopolymer, and substituting RP for 100% GGBS resulted in relatively loose micro-structure of sustainable geopolymer. Incorporating RP decreased the autogenous shrinkage of GGBSbased geopolymer, but the mix of high-volume RP increased the drying shrinkage of GGBS-based geopolymer. The mechanical strength and resistance to water ingress of GGBS-based geopolymer decreased as the RP replacing rate was increased, and substituting RP for 100% GGBS led to a significant reduction of mechanical strength and water absorption resistance. However, the mechanical strength of geopolymer with 100% RP from hardened cement paste waste was much better relative to geopolymer with 100% RP from mortar waste or concrete waste, because hydrated cement particle in RP has relatively high polymerization activity. Optimizing RP type and replacing rate can prepare sustainable geopolymer with good performance, and the upcycling of 100% RP for fully recycled geopolymer is feasible and sustainable.