聚乙烯醇对水泥砂浆流变性能的影响。

Effect of Polyvinyl Alcohol on the Rheological Properties of Cement Mortar.

机构信息

Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi'an 710123, China.

School of Civil Engineering, Dalian University of Technology, Dalian 116023, China.

出版信息

Molecules. 2020 Feb 10;25(3):754. doi: 10.3390/molecules25030754.

DOI:10.3390/molecules25030754

PMID:32050522

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7037168/

Abstract

Polyvinyl alcohol (PVA) is a kind of water-soluble polymer, which has been widely used in different industries due to its excellent mechanical and chemical properties. In this paper, the effects of polyvinyl alcohol with different hydrolysis and polymerization degrees on the rheological properties of cement mortar are studied. The results show that the rheological properties of PVA-modified cement mortar can be described by the modified Bingham model. The yield stress of modified cement mortar is less than that of unmodified mortar when the degree of polymerization and the content of PVA are small. With the increase of polyvinyl alcohol content and polymerization degree, the yield stress and plastic viscosity of modified cement mortar increase sharply, which are larger than those of the unmodified cement mortar. However, the effect of hydrolysis degree of PVA on yield stress and plastic viscosity of modified cement mortar is not obvious.

摘要

聚乙烯醇（PVA）是一种水溶性聚合物，由于其优异的机械和化学性能，已被广泛应用于不同的行业。本文研究了不同水解度和聚合度的聚乙烯醇对水泥砂浆流变性的影响。结果表明，PVA 改性水泥砂浆的流变性可用修正宾汉模型来描述。当聚合度和 PVA 含量较小时，改性水泥砂浆的屈服应力小于未改性水泥砂浆。随着聚乙烯醇含量和聚合度的增加，改性水泥砂浆的屈服应力和塑性粘度急剧增加，大于未改性水泥砂浆。然而，PVA 的水解度对改性水泥砂浆的屈服应力和塑性粘度的影响并不明显。