文献类型：期刊文献

英文题名：Damping performance of structural concrete incorporating emulsion-impregnated lightweight aggregates after freeze-thaw damage

作者：Chen, Hanlong[1];Hou, Shaodan[1];Mo, Kim Hung[2];Wang, Shunxiang[1];Lei, Bin[3];Gao, Yueqing[1];Liang, Chaofeng[1,4]

机构：[1]Shaoxing Univ, Coll Civil Engn, Shaoxing 312000, Peoples R China;[2]Sunway Univ, Sch Engn & Technol, Dept Engn, Selangor 47500, Malaysia;[3]Nanchang Univ, Coll Infrastruct Engn, Nanchang 330031, Peoples R China;[4]Shaoxing Univ, State Key Lab Intelligent Deep Met Min & Equipment, Shaoxing 312000, Peoples R China

年份：2025

卷号：111

外文期刊名：JOURNAL OF BUILDING ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001551058700001)、、EI(收录号：20253018845623)、Scopus(收录号：2-s2.0-105011391817)、WOS

基金：The authors greatly acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 52479129 and 52302026) , the Natural Science Foundation of Zhejiang Province (LGF22E080035) , the General Research Project of Zhejiang Provincial Education Department (Grant No. Y202351884) , and the Science and Technology Plan Project of Shaoxing City (Grant No. 2023B43003) .

语种：英文

外文关键词：Emulsion impregnation; Lightweight aggregate concrete; Frost resistance; Damping property; Damping mechanism

外文摘要：Developing materials with simultaneously enhanced frost resistance and damping performance is crucial for railway infrastructure subjected to frost erosion and dynamic loading. However, the damping property of cementitious materials suffering from freeze-thaw damage has been rarely explored. This study proposes a structurally competent concrete (EIAC) incorporating emulsion-impregnated lightweight aggregates (EIA). The frost resistance of EIAC was evaluated, and its damping performance after experiencing different freeze-thaw cycles (FTCs) was assessed through bending free vibration tests. The evolution mechanism of damping properties was further analyzed based on the internal micromorphology and porosity test after FTCs. Results show that all EIAC formulations met the C30 compressive strength requirement. Increasing the EIA substitution rate markedly improved frost resistance and damping capacity of concrete. The EIAC incorporating EIA impregnated with pure acrylic emulsion, exhibited excellent freeze-thaw resistance, retaining 84.0 % of its relative dynamic modulus after 200 FTCs. Compared to the natural concrete, the damping ratio of EIAC increased by up to 15.3 %-221.6 %. Moreover, freeze-thaw damage enhanced the damping properties of EIAC, with maximum increases of 135.2 % in the damping ratio and 70.2 % in loss modulus after 200 FTCs. The improved damping performance of concrete under freeze-thaw damage is primarily attributed to Coulomb damping resulting from microcrack friction and mechanical hysteresis induced by porosity. This study provides new insights into the design of high-damping and frost-resistant concrete for railway infrastructure applications in severe cold regions.