| Issue |
E3S Web Conf.
Volume 283, 2021
2021 3rd International Conference on Civil, Architecture and Urban Engineering (ICCAUE 2021)
|
|
|---|---|---|
| Article Number | 01048 | |
| Number of page(s) | 4 | |
| Section | Research on Civil Engineering and Geotechnical Hydrological Structure | |
| DOI | https://doi.org/10.1051/e3sconf/202128301048 | |
| Published online | 07 July 2021 | |
Dispersing Effect of Core Cross-linked Star Polycarboxylate Superplasticizers on the Cement Paste
1 Guangzhou Institute of Building Science Co., Ltd., Guangzhou, People’s Republic of China
2 Guangzhou Municipal Construction Group Co., Ltd., Guangzhou, People’s Republic of China
* Corresponding author: zhangjl117@126.com
* 42325231@qq.com
Researches on topological modification of polycarboxylate superplasticizers to improve the water-reducing or slump-retainning properties have been a hot topic in rencent years. Herein, a core crosslinked star polycarboxylate superplasticizers (SPCE) were synthesized by crosslinking the comb polycarboxylate superplasticizers (CPCE) in aqueous solution. Crosslinkers and spacing monomers were added into the polymerization to promote the formation of hydrophobic core. A larger molecular weight with 75% of yields of the SPCE were observed by gel permeation chromatography (GPC). The dispersing effect of SPCE on the cement paste was then investigated by varying the dosage of crosslinkers and spacing monomers. It was found that the dispersing ability of SPCE became weakened compared to the CPCE. More of the crosslinkers led to smaller flow spread, as revealed by cement paste experiments. Introduction of the spacing monomers contributed to the formation of SPCE. However, the dispersing ability was also weakened. Best conversion efficiency and water-reducing ability was obtained when the molar ratio of crosslinker and spacing monomer to CPCE was set as 3:5:1.
© The Authors, published by EDP Sciences, 2021
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