文献类型：期刊文献

英文题名：Mechanical Properties and Microstructure of Polyvinyl Alcohol (PVA) Modified Cement Mortar

作者：Fan, Jie Li, Gengying Deng, Sijie Wang, Zhongkun

第一作者：范杰

通信作者：Li, GY[1]

机构：[1]Guizhou Inst Technol, Sch Civil Engn, Guiyang 515063, Guizhou, Peoples R China;[2]South China Agr Univ, Coll Water Conservancy & Civil Engn, Guangzhou 510642, Guangdong, Peoples R China

第一机构：贵州理工学院土木工程学院

通信机构：corresponding author), South China Agr Univ, Coll Water Conservancy & Civil Engn, Guangzhou 510642, Guangdong, Peoples R China.

年份：2019

卷号：9

期号：11

外文期刊名：APPLIED SCIENCES-BASEL

收录：;Scopus(收录号：2-s2.0-85067258925);WOS:【SCI-EXPANDED(收录号:WOS:000472641200006)】；

基金：This work is supported by the National Natural Science Foundation of PR China (No. 51708145, No. 51878299), the project of Natural Science Research Foundation of Guizhou Province (No. [2018]1064), and the Science and Technology Plan of Guangdong Province (2015A010105029).

语种：英文

外文关键词：polyvinyl alcohol; cement mortar; mechanical properties; microstructure

摘要：The mechanical properties of cement mortars with 0 similar to 2.0% (by mass) polyvinyl alcohol (PVA) were experimentally studied, and the effects of PVA incorporation on the hydration products and microstructure of the cement mortar were determined with differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The results show that the rational content of PVA formed evenly dispersed network-like thin films within the cement matrix, and these network-like films can bridge cracks in the cement matrix and improve the mechanical properties of the cement mortar. Over- incorporation of PVA may result in the formation of large piece polymer films that coat the cement particles, delay the hydration of the cement mortar and adversely affect its performance. The mechanical properties of the cement mortar show a significant increase and then decrease with a change in the PVA incorporation. When the PVA content was 0.6% and 1.0%, the mortar had the best compressive and flexural strengths, respectively. The compressive strength of the cement mortar increased by 12.15% for a PVA content of 0.6%, and the flexural strength of the cement mortar increased by 24.83% for a PVA content of 1.0%.