羟乙基甲基纤维素改性水泥砂浆的物理力学性能和孔隙率

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Abstract In order to study the influence of different hydroxyethyl methyl celluloses (HEMCs) on the properties of cement mortar, three kinds of HEMCs were used to prepare modified cement mortar in this paper. Those HEMCs are high, low substitution degree and polyacrylamide (PAAm) modified HEMC. The influence of the HEMCs on cement mortar was compared from the mechanical properties, porosity and pore size distribution. The results show that the addition of HEMCs can improve the water retention rate and consistence of fresh cement mortar, increase the tensile bond strength, but decrease the compressive strength and flexural strength. The substitution degree and PAAm have minor influence on the water retention rate and flexural strength. Compared to HEMC with low substitution degree, HEMC with higher substitution degree have higher consistence, tensile bond strength and dry shrinkage rate. PAAm significantly decreases the consistence of HEMC-modified cement paste and decreases the tensile bond strength too. The result of mercury intrusion porosimeter (MIP) shows that the small pores of mortar are reduced by the addition of HEMCs, meanwhile a considerable number of micro-sized macropores are introduced, and the porosity of cement mortar also are increased; but no significant difference observed among the HEMC-modified mortars.

Key words： hydroxyethyl methyl cellulose degree of substitution cement mortar physical and mechanical properties porosity

Published: 08 January 2021

CLC number:

TU526

Fund:This work was financially supported by the National Natural Science Foundation of China (51872203, 51572196) and Sino-German Science Foundation (GZ 1290).

About author:: Shaokang Zhang received his bachelor's degree in June 2016 from China University of Mining and Technology. Now, he studies for his master's degree at Tongji University, focusing on the research of polymer modified cement mortar. Ru Wang received her Ph.D. degree in materials science from Sichuan Univdersity in 2003. She conducted postdoctoral research in 2003—2005 at Tongji University and 2005—2006 at Vienna University of Technology, Austria, and is a visitor in 2010—2011 in Columbia University in the city of New York, USA. She is currently a professor and doctoral supervisor of Tongji University, and the vice-president of International Congress on Polymers in Concrete. She has published more than 100 academic papers, most of which were included by SCI and EI. She has published some books including “Progress in Polymers in Concrete” and “Testing methods for raw materials and product of dry mixed mortar”. Her research interests are the basic theory and application of polymer cement-based composites.

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	ZHANG Shaokang
	WANG Ru
	XU Linglin
	ZHONG Shiyun
	ZHANG Guofang
	WANG Peiming

Cite this article:

ZHANG Shaokang,WANG Ru,XU Linglin, et al. Physical and Mechanical Properties and Porosity of Cement Mortar Modified by Hydroxyethyl Methyl Cellulose[J]. Materials Reports, 2020, 34(Z2): 607-611.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2020/V34/IZ2/607

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