Journal Published Online: 27 August 2019
Volume 49, Issue 4

Effect of Degree of Hydrolysis of Polyvinyl Alcohol on Adhesive Properties of Cement Mortar

CODEN: JTEVAB

Abstract

Polyvinyl alcohol (PVA) is widely used in the building industry to improve the fresh and hardened properties of cement composites. In this article, the effect of partially and fully hydrolyzed PVA on physical and adhesive properties of fresh and hardened cement mortar was investigated. Results showed that both partially and fully hydrolyzed PVA could significantly improve the adhesive properties of cement mortar. The mode of rupture changed from mostly interfacial rupture without PVA in cement mortar to mixed-mode interfacial-cohesive rupture with 1.5 wt.% PVA. Partially hydrolyzed PVA-modified cement mortars had smaller bulk density and higher fluidity compared with fully hydrolyzed PVA. X-ray powder diffraction, thermal analysis, mercury intrusion porosimetry, and scanning electron microscopy were used to investigate cement hydration and microstructure of PVA-modified cement composites. As a result, fully hydrolyzed PVA was more conducive to promote cement hydration and had smaller impact on crystal structure and content of calcium hydroxide (Ca(OH)2) compared with partially hydrolyzed PVA. Besides, the addition of both partially and fully hydrolyzed PVA affected the morphology and the oriented growth of Ca(OH)2 in cement composites. Furthermore, PVA-modified mortar had finer pore size distribution and higher porosity than unmodified mortar.

Author Information

Wang, Baomin
School of Civil Engineering, Dalian University of Technology, Dalian, Liaoning, P.R. China
Xing, Yunqing
School of Civil Engineering, Dalian University of Technology, Dalian, Liaoning, P.R. China
Pages: 14
Price: $25.00
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Details
Stock #: JTE20190036
ISSN: 0090-3973
DOI: 10.1520/JTE20190036