Effect of Polycarboxylate Superplasticizer Modified by Sodium Hypophosphite on the Properties of -Calcium Sulfate Hemihydrate
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 1
Abstract
In this study, sodium hypophosphite (SHP) was used to modify polycarboxylate superplasticizer (P-PCE), and the properties of P-PCE on -calcium sulfate hemihydrate () were systematically investigated. The results showed that P-PCE could exhibit better fluidity and more retarding effect compared with the conventional polycarboxylate superplasticizer (C-PCE). The reason might be ascribed to the higher adsorption ability of P-PCE because of its stronger complexing capacity with calcium ion, which was induced by the phosphonate and phosphinate groups in the P-PCE molecule. Additionally, PCE played an important function in hindering the calcium sulfate dehydrate (DH) crystallization instead of the dissolution of , resulting in the retarding effect. This new type of PCE can show great potential in gypsum engineering.
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Data Availability Statement
The data that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was financially supported by the Taishan Scholars Program, Case-by-Case Project for Top Outstanding Talents of Jinan and the National Natural Science Foundation of China (Grant Nos. 51778269 and 51672106).
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Journal of Materials in Civil Engineering
Volume 35 • Issue 1 • January 2023
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© 2022 American Society of Civil Engineers.
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Received: Dec 14, 2021
Accepted: Apr 22, 2022
Published online: Oct 19, 2022
Published in print: Jan 1, 2023
Discussion open until: Mar 19, 2023
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