水泥砂浆弹性模量随温度的演化规律

doi:10.11896/cldb.201902010

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Abstract As a crucial performance parameter and structural design parameter of the cement mortar, the elastic modulus is of great importance to ensure safety and reliability of the cement-based components in service. Aiming at conquering the technical problem that the elastic modulus of cement mortar under low and high temperature service conditions cannot be measured accurately, an innovative method (named as the relative modified split ring method) combining the modified split ring method and the relative method was employed in this study, the elastic modulus of Portland cement mortar at -70—800 ℃ was successfully measured. Besides, the evolution law of elastic modulus of water-saturated and dry mortar samples as a function of temperature is investigated. The results indicated that there was a 32.67% increase of elastic modulus of water-saturated mortar, in the range from ambient temperature to -70 ℃, owing to the filling effect and gluing effect of the ice, and the growth rate of modulus increased gradually with the drop of test temperature. While the modulus of the dry piece remained unchanged in the process of cooling, thanks to its low water content. Due to the dehydration and decomposition of the hydration products and the microstructure degradation at high temperature, the elastic modulus of the water-saturated and dry samples declined by 93.78% and 83.51%, respectively, with the increasing temperature from room temperature to 800 ℃. And the modulus decreasing velocity was gradually reduced with increase of test temperature.

Key words： modified split ring method relative method cement mortar elastic modulus low temperature high temperature

Published: 31 January 2019

CLC number:

TU502+.6

Fund:This work was financially supported by the Natural Science Foundation of China (51472227), National High Technology Research and Development Program of China (863 Program)(2015AA034204), the National Key Research and Development Program of China (2017YFB0310400).

About author:: Yiwang Bao received his PhD. Degree in materials from China Building Materials Academy in 1990. He is currently a professor in China Building Materials Academy and a chief scientist in China Building Material Test & Certification Group Co., Ltd. His research interests are new technologies for determining mechanical properties of inorganic materials in extreme environments. He has published more than 120 SCI papers, more than 180 EI papers, applied more than 50 national invention patents and 6 of them were established as standards, and published 2 books.

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	NIE Guanglin
	BAO Yiwang
	TIAN Yuan
	WAN Detian

Cite this article:

NIE Guanglin,BAO Yiwang,TIAN Yuan, et al. Evolution of Elastic Modulus of Cement Mortar as a Function of Temperature[J]. Materials Reports, 2019, 33(2): 251-256.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.201902010 OR http://www.mater-rep.com/EN/Y2019/V33/I2/251

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