Unravelling determining role of recycled powder adsorbing polycarboxylate ethers in recycled cement paste dispersion

被引：0
作者：
Yang, Ken [1 ]
Liu, Sijia [1 ]
Liu, Yisong [1 ]
Wu, Kai [1 ]
Duan, Zhenhua [2 ]
Xiao, Jianzhuang [2 ]
Xu, Linglin [1 ]
机构：
[1] Tongji Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Adv Civil Engn Mat, Shanghai 201804, Peoples R China
[2] Tongji Univ, Coll Civil Engn, Dept Struct Engn, Shanghai 200092, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2025年 / 485卷
关键词：
Recycled powder; Polycarboxylate-ether; Adsorption; Dispersing performance; Capillary water; MOLECULAR-STRUCTURE; DEMOLITION WASTE; SUPERPLASTICIZERS; ADSORPTION; CONSTRUCTION; PERFORMANCE; CONCRETE; BEHAVIOR;
D O I：
10.1016/j.conbuildmat.2025.141535
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Integration of recycled powder (RP) from waste concrete into Portland cement paste always results in loss of workability, underscoring the necessity for high-performance superplasticizers. This study systematically investigates the interaction between RP and synthesized polycarboxylate ethers (PCE) with different functional groups, by means of low-field 1H NMR, total organic carbon and zeta potential tests. Results reveal an inverse relationship between the dispersion performance of cement pastes incorporating RP and the PCE adsorption percentage onto RP. Specifically, as the adsorption percentage of PCE on RP increases, there is a concomitant decline in water absorption of RP. This decline enhances retention of capillary water but compromises dispersion performance. This work would offer valuable insights for the design of superplasticizers applied in recycled mortar and recycled concrete.
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页数：11
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