Effect of Polycarboxylate Superplasticizer Modified by Sodium Hypophosphite on the Properties of β-Calcium Sulfate Hemihydrate

AbstractIn this study, sodium hypophosphite (SHP) was used to modify polycarboxylate superplasticizer (P-PCE), and the properties of P-PCE on β-calcium sulfate hemihydrate (β-HH) were systematically investigated. The results showed that P-PCE could exhibit better fluidity and more retarding effect c...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2023-01, Vol.35 (1)
Main Authors: Zhang, Ming, Wang, Luyan, Zhang, Xiuzhi, Mi, Xiangyun, Sun, Fengmeng, Fang, Zhenzhen, Pei, Meishan
Format: Article
Language:English
Subjects:
Building materials
Calcium ions
Calcium sulfate hemihydrate
Civil engineering
Crystallization
Dehydration
Gypsum
Phosphonates
Retarding
Sodium
Superplasticizers
Technical Papers
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Summary:AbstractIn this study, sodium hypophosphite (SHP) was used to modify polycarboxylate superplasticizer (P-PCE), and the properties of P-PCE on β-calcium sulfate hemihydrate (β-HH) 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 β-HH, resulting in the retarding effect. This new type of PCE can show great potential in gypsum engineering.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)MT.1943-5533.0004529