碳纤维混凝土高温冷却后动态压缩性能试验研究  

Experimental Study on Dynamic Compressive Behaviors of Carbon Fiber Reinforced Concrete After High Temperature Cooling

作　　者：杜刚 李亮[1] 王子晨 吴俊[2] 杜修力[1] DU Gang;LI Liang;WANG Zichen;WU Jun;DU Xiuli(Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China;School of Civil Engineering,Shanghai Normal University,Shanghai 201418,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]上海师范大学土木工程学院,上海201418

出　　处：《材料导报》2025年第6期99-104,共6页Materials Reports

基　　金：国家自然科学基金面上项目(52278474,52078288);北京市自然科学基金面上项目(8212001)。

摘　　要：碳纤维混凝土(CFRC)是一种新型高性能混凝土材料,具有高抗拉强度和耐久性,在工程领域具有广阔的应用前景。然而,混凝土材料可能遭受爆炸、火灾等极端荷载,导致材料性能退化。因此,通过研究CFRC在高温后的动态压缩性能,可以更全面地了解材料在极端条件下的力学响应,为其在实际工程中的应用提供可靠依据。本研究利用直径为75 mm的分离式霍普金森压杆装置(SHPB),对具有不同纤维体积含量(0%、1%和2%)的碳纤维混凝土在经历不同目标温度(200℃、400℃、600℃和800℃)后自然冷却至室温的情况下进行了动态压缩性能试验。试验结果表明,在经历不同目标温度再冷却后,三类混凝土试件均呈现明显的应变率效应。随着碳纤维掺量的增加,试件的破坏程度逐渐减轻,动态峰值应变逐渐减小。此外,随着目标温度的升高,试件的动态峰值应力逐渐减小,而峰值应变增加,破坏程度逐渐加重。Carbon fiber reinforced concrete(CFRC)represents a novel high-performance construction material characterized by exceptional tensile strength and durability,thus holding significant potential for various engineering applications.Nevertheless,concrete materials,which may face extreme conditions like explosions and fires,will lead to the deterioration of their properties.Therefore,exploring the dynamic compressive behaviors of CFRC after exposure to high temperatures allows for a comprehensive understanding of material responses under extreme condi-tions,thus establishing a dependable basis for practical engineering applications.This research employed a split Hopkinson pressure bar(SHPB)with a 75 mm diameter to analyze the dynamic compression characteristics of CFRC with varying fiber volume ratios(0%,1%,and 2%)after being subjected to different target temperatures(200℃,400℃,600℃,and 800℃)and subsequently cooled to room temperature.The results indicate that all types of concrete specimens exhibit an obvious strain rate effect following cooling at various target temperatures.Notably,as the carbon fiber content increases,the damage degree of the specimen gradually decreases,along with a corresponding reduction in dynamic peak strain.Moreover,elevating target temperatures corresponds to a decrease in dynamic peak stress,an increase in peak strain,and intensi-fied specimen failure.

关 键 词：碳纤维混凝土(CFRC) 高温冷却 动态压缩性能 应力峰值前韧度 

分 类 号：TU502[建筑科学—建筑技术科学]