养护环境对预损伤纤维混凝土自愈合行为及微观结构的影响  

Influence of Maintenance Environment on Self-healing Behavior and Microstructure of Pre Damaged Fiber Reinforced Concrete

作　　者：杨飞 汪精云 郭鹏斐 肖东 YANG Fei;WANG Jing-yun;GUO Peng-fei;XIAO Dong(Henan Technical College of Construction,Zhengzhou 450064,China;Sichuan Railway Intelligent Operation and Maintenance Engineering Research Center,Chengdu 610218,China)

机构地区：[1]河南建筑职业技术学院,河南郑州450064 [2]四川省轨道交通线路智能运维工程研究中心,四川成都610218

出　　处：《水电能源科学》2025年第4期120-123,共4页Water Resources and Power

基　　金：国家自然科学基金项目(51108170)。

摘　　要：为研究混凝土在水养护及冻融环境下自愈合行为,以钢纤维增强混凝土为例,设置2组预损伤水平,开展了单轴拉伸及SEM试验,分析预损伤程度和冻融环境对混凝土拉伸力学性能及微观结构的影响和演化规律。结果表明,经水养和冻融循环后,混凝土均表现出拉伸应变硬化行为。其中,经水养后试件的初裂强度和抗拉强度基本恢复至初始状态;试件在水养后质量增长,预损伤程度越大,质量增加幅度越大;远离预损伤位置(尤其是纤维-基体界面)存在大量孔隙和微孔洞,结构疏松,而靠近裂缝处由于二次水化产物生成和堆积,导致结构更加致密,混凝土耐久性增强。To study the self-healing behavior of concrete under water curing and freeze-thaw environments,basalt fiber reinforced concrete was taken as the research object.Two sets of pre damage levels were set,uniaxial tensile and SEM experiments were carried out to analyze the impact and evolution law of pre damage degree and freeze-thaw environment on the mechanical properties and microstructure of concrete.The results show that after water curing and freezethaw cycles,concrete exhibits tensile strain hardening behavior.After water curing,the initial crack strength and tensile strength of the specimens have basically returned to their initial state;The mass of the specimen increases after water curing,and the greater the degree of pre damage,the greater the magnitude of mass increase;There are a large number of pores and micropores far from the pre damage location(especially at the fiber matrix interface),resulting in a loose structure.However,near the crack,due to the accumulation of secondary hydration products,the structure becomes denser,and concrete durability enhances.

关 键 词：钢纤维混凝土 预损伤程度 养护环境 愈合行为 SEM 

分 类 号：TV431.3[水利工程—水工结构工程]