Variation Pattern of the Elastic Modulus of Concrete under Combined Humidity and Heat Conditions

被引：6

作者：

Li, Ping ^{[1
]}

Zhang, Yanru ^{[1
]}

Duan, Shiwei ^{[1
]}

Huang, Ruiyuan ^{[2
]}

Gu, Jiming ^{[1
]}

机构：

[1] Anhui Univ Technol, Sch Mech Engn, Maanshan 243032, Peoples R China

[2] Fuzhou Univ, Coll Civil Engn, Fuzhou 350116, Peoples R China

来源：

MATERIALS | 2023年 / 16卷 / 15期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

concrete elastic modulus; temperature effect; water effect; humidity-heat coupling factor; MOISTURE; TEMPERATURE; STRENGTH; BEHAVIOR;

D O I：

10.3390/ma16155447

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The coupling effect of moisture content and temperature on the elastic modulus of concrete is experimentally investigated. The elastic modulus of dry concrete exhibits a clear temperature-weakening effect, while the elastic modulus of wet concrete exhibits a water-strengthening effect at room temperature. Under humidity-heat conditions, the elastic modulus of wet concrete declines with the temperature rise. When the temperature is 20 & DEG;C, 200 & DEG;C, 400 & DEG;C, 520 & DEG;C, and 620 & DEG;C, the humidity-heat coupling factors of the elastic modulus change rate DIF with moisture content are 0.08, 0.07, 0.04, 0.01, and -0.03, respectively, and the declining rate increases with the rise of moisture content. The relation between the humidity-heat coupling factor DIF, moisture content, and temperature was established; The equivalent relation between the water-strengthening effect and the temperature-weakening effect of the elastic modulus was obtained. The temperature range of the strengthening effect and "apparent weakening effect" of water stored inside concrete before heating on elastic modulus was determined; The evolutionary mechanism of the competition between the microcrack expansion and healing of concrete under combined humidity and heat conditions was revealed.

引用

页数：16

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