The Effects of Ester and Ether Polycarboxylate Superplasticizers on the Fluidity and Setting Behavior of Alkali-Activated Slag Paste

被引:0
|
作者
Kim, Yong Jic [1 ]
Choi, Sung [2 ]
Oh, Sung Rok [3 ]
机构
[1] Daejin Univ, Div Smart Construct & Environm Engn, Pochon 11159, South Korea
[2] Kyungdong Univ, Dept Civil Engn, Yangju 11458, South Korea
[3] Newjust Co Ltd, R&D Team, Gwangmyeong 14348, South Korea
关键词
alkali-activated slag; ester polycarboxylate superplasticizer; ether polycarboxylate superplasticizer; fluidity; setting time; ADMIXTURES; MECHANISMS; RHEOLOGY; STRENGTH; BINDERS; CEMENT;
D O I
10.3390/ma17204951
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This study aims to investigate the comparative performance of ester- and ether-based polycarboxylate superplasticizers in maintaining the fluidity and controlling the setting time of alkali-activated slag (AAS) paste. The experiments employed rheological tests, mini-slump tests, ultrasonic pulse velocity (UPV) measurements, and gel permeation chromatography (GPC) analysis. The results indicate that ether-based superplasticizers maintain fluidity approximately 25% longer than their ester-based counterparts and extend the setting time by about 30%. The enhanced performance of ether-based superplasticizers is attributed to their superior molecular stability in highly alkaline environments, which mitigates early polymer degradation. Additionally, the Na2O/SiO2 ratio was maintained at 1:1 throughout the experiments to ensure consistency in the activation process. The relationship between fluidity loss and the onset of setting occurs more rapidly in AAS paste than in conventional cement-based systems. These findings provide valuable insights for the development of environmentally friendly construction materials by optimizing the use of superplasticizers in alkali-activated systems.
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页数:16
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