Modulating Water Absorption of Hardened Gypsum Plaster with Enhanced Mechanical Strengths by Molecular Modification of Polyvinyl Alcohol

AbstractIn general, polymers that enhance the mechanical strength of gypsum plaster simultaneously decrease its water absorption capability. In this research, starting from polyvinyl acetate (PVAc) and polyvinyl alcohol (PVA), respectively, two groups of PVA-derived polymers were, partially hydrolyz...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2019-11, Vol.31 (11)
Main Authors: An, Zhuan-zhuan, Zhou, Zhuo-yu, Xia, Yong-mei, Xin, Di, Hu, Xue-yi, Fang, Yun
Format: Article
Language:English
Subjects:
Acetates
Building materials
Ceramics industry
Civil engineering
Construction materials
Gypsum
Gypsum plaster
Hydration
Hydrolysis
Mechanical properties
Morphology
Optimization
Polyvinyl acetates
Polyvinyl alcohol
Strength
Technical Note
Technical Notes
Water absorption
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Summary:AbstractIn general, polymers that enhance the mechanical strength of gypsum plaster simultaneously decrease its water absorption capability. In this research, starting from polyvinyl acetate (PVAc) and polyvinyl alcohol (PVA), respectively, two groups of PVA-derived polymers were, partially hydrolyzed polyvinyl acetates (PHPVAs) and polyvinyl alcohol sulfates (PVAS). The modulation of mechanical strength and water absorption of gypsum plaster with PHPVA and PVAS was studied. Their structure–property relationship was investigated. Except for morphology, the influence of product structure on the mechanical properties of the hardened gypsum plaster was studied, including mechanical strengths, dynamic water absorption, hydration degree, and hydration temperature. The mechanical strength initially increased with increasing hydrolysis or sulfonation degree but eventually decreased. The water absorption capability was proportional to the hydrolysis degree but was not significantly related to sulfonation degree. PVAS are the optimum candidate for modeling material, whereas PHPVA is optimal for construction materials. By molecular modification of PVA, highly enhanced mechanical strength can be realized with modulatable water absorption of the hardened gypsum plaster.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)MT.1943-5533.0002915