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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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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cited_by cdi_FETCH-LOGICAL-a267t-2dee7de2b46b8c421c99b839e160bc4b40fd4f49b86ce70f508d18cbda07668f3
cites cdi_FETCH-LOGICAL-a267t-2dee7de2b46b8c421c99b839e160bc4b40fd4f49b86ce70f508d18cbda07668f3
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container_title Journal of materials in civil engineering
container_volume 35
creator Zhang, Ming
Wang, Luyan
Zhang, Xiuzhi
Mi, Xiangyun
Sun, Fengmeng
Fang, Zhenzhen
Pei, Meishan
description 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.
doi_str_mv 10.1061/(ASCE)MT.1943-5533.0004529
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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. 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source ASCE美国土木工程师学会电子期刊和会议录
subjects Building materials
Calcium ions
Calcium sulfate hemihydrate
Civil engineering
Crystallization
Dehydration
Gypsum
Phosphonates
Retarding
Sodium
Superplasticizers
Technical Papers
title Effect of Polycarboxylate Superplasticizer Modified by Sodium Hypophosphite on the Properties of β-Calcium Sulfate Hemihydrate
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