冻融循环作用下橡胶混凝土能量耗散及微观结构试验研究  

Experimental Study on Energy Dissipation and Microstructure of Rubber Concrete under Freeze-thaw Cycle

作　　者：张玲玲 ZHANG Linging(School of Transportation and Civil Engineering,Hefei Professional College of Economic and Technical,Hefei 230031,China)

机构地区：[1]合肥经济技术职业学院交通与建筑工程学院,合肥230031

出　　处：《安阳工学院学报》2025年第2期106-112,共7页Journal of Anyang Institute of Technology

基　　金：安徽省高校科研自然科学类(2023AH053118)。

摘　　要：为探究冻融作用下素混凝土及橡胶混凝土损伤程度及能量耗散变化规律,通过声波检测、静态单轴压缩试验及电镜扫描获取试件物理力学性能及微观结构,分析在不同冻融循环次数(0、30、60、90、120、150)下试件损伤程度、峰值应力、能量耗散规律及内部微观结构。结果表明:冻融循环作用会降低试件纵波波速,且循环次数越多试件损伤程度越显著。冻融作用会降低试件抵抗外荷载能力,试件峰值应力与冻融循环次数间呈二次函数负相关,橡胶混凝土应力降幅明显小于素混凝土。橡胶的掺入能够极大增强混凝土试件的延性及吸能效果,降低冻融循环作用下试件裂纹裂缝扩展程度,使得混凝土材料抗冻性得到显著提升。To explore the variation of damage degree and energy dissipation of plain concrete and rubber concrete under freeze-thaw action,the physical mechanical properties and microstructure of the specimens were obtained through acoustic wave detection,static uniaxial compression test and scanning electron microscopy(SEM).The damage degree,peak stress,energy dissipation pattern and internal microstructure of specimens were analyzed under different numbers of freeze-thaw cycles(0,30,60,90,120,150).Findings reveal that the longitudinal wave velocity of the specimens is decreased by freeze-thaw cycles.Specifically,the damage degree of the specimens becomes more pronounced as the number of cycles increases.The freeze-thaw action reduces the specimens ability to resist external loads.The peak stress of the specimens exhibits a negative quadratic function correlation with the number of freeze-thaw cycles,while the stress reduction of rubber concrete is significantly smaller than that of plain concrete.The incorporation of rubber significantly enhances the ductility and energy absorption effect of concrete specimens,reduces the crack propagation degree of specimens under freeze-thaw cycles,and remarkably improves the frost resistance of concrete materials.

关 键 词：冻融循环 橡胶混凝土 损伤度 峰值应力 能量耗散 电镜扫描 

分 类 号：TU528.57[建筑科学—建筑技术科学]