Modulating Water Absorption of Hardened Gypsum Plaster with Enhanced Mechanical Strengths by Molecular Modification of Polyvinyl Alcohol
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 11
Abstract
In 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.
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Acknowledgments
Financial support from the Key Project of the National 12th Five Year Research Program of China (2011BAE30B02 and 2014BAE03B00) is acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 11 • November 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Sep 7, 2018
Accepted: May 29, 2019
Published online: Aug 29, 2019
Published in print: Nov 1, 2019
Discussion open until: Jan 29, 2020
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