微胶囊粒径对水工自修复混凝土力学性能的影响研究  

Effect of Microcapsule Particle Size on Mechanical Properties ofHydraulic Self-repairing Concrete

作　　者：袁金峰[1] 张丽梅[1] 王忠 董广昊[1] 王斐[1] YUAN Jin-feng;ZHANG Li-mei;WANG Zhong;DONG Guang-hao;WANG Fei(Jilin Provincial Institute of Water Resources Science,Changchun 130022,Jilin Province,China)

机构地区：[1]吉林省水利科学研究院,吉林长春130022 [2]吉林省水利厅重点项目建设管理办公室,吉林长春130028

出　　处：《中国农村水利水电》2025年第2期193-200,共8页China Rural Water and Hydropower

基　　金：吉林省科技发展计划项目(20210203212SF)。

摘　　要：微胶囊自修复技术是解决混凝土劣化、提升耐久性的有效方法,近年来研究者对毫米级和百微米级自修复微胶囊的研究揭示了微胶囊的自修复作用,但都造成了基体混凝土力学性能的减低。通过控制搅拌速率等措施合成了粒径40μm和粒径8μm的微胶囊,并对混凝土的力学性能影响进行了研究,结果表明:(1)两种粒径微胶囊化学结构稳定,热稳定性较好,加入混凝土在搅拌后大粒径微胶囊有破碎现象,小粒径微胶囊表面变得粗糙。当混凝土受损出现裂缝时,微胶囊会及时破裂,囊芯材物质会流出对混凝土进行修复。(2)40μm的微胶囊掺入混凝土后,均造成混凝土抗压强度和抗折强度的下降;8μm的微胶囊掺入混凝土后,在4%以下掺量时混凝土抗压强度和抗折强度逐渐上升,超过4%以后开始下降。(3)40μm和8μm的微胶囊均对混凝土抗压和抗折造成的损伤具有修复作用,40μm的微胶囊混凝土最大抗压、抗折强度恢复率为110.2%、113.0%,8μm的微胶囊混凝土最大抗压、抗折强度恢复率为115.6%、114.7%。但当掺量增加到一定量时会到达拐点,然后修复效果开始降低。水工混凝土应用可通过控制微胶囊粒径,能够有效改善混凝土力学性能,且在混凝土受到破坏损伤时及时自我修复。Microcapsule self-repairing technology is an effective method to solve the deterioration of concrete and improve its durability.In recent years,researchers have revealed the self-repairing function of microcapsule by studying the self-repairing microcapsule on millimeter-scale and hundred-micrometer-scale.However,the mechanical properties of matrix concrete are reduced.The microcapsules with particle size of 40μm and 8μm were synthesized by controlling the mixing rate and other measures,and the effects of the microcapsules on the mechanical properties of concrete were studied.Results show that:①The thermal stability of the two particle sizes of microcapsules is good,the large-size microcapsules are broken after adding concrete,and the surface of small-size microcapsules becomes rough;When concrete is damaged and cracks appear,microcapsules will rupture in a timely manner,and the core material will flow out to repair the concrete.②The compressive strength and flexural strength of concrete decrease with the addition of 40μm microcapsules,while the compressive strength and flexural strength of concrete increase with the addition of 8μm microcapsules when the content is less than 4%and begin to decrease after exceeding 4%;③Both 40μm and 8μm microcapsules can repair the damage caused by compression and bending of concrete.The maximum recovery rates of compressive and flexural strength of 40μm microencapsulated concrete are 110.2%and 113.0%respectively,and those of 8μm microencapsulated concrete are 115.6%and 114.7%,respectively.However,when the amount of microcapsules is increased to a certain extent,it will reach an inflection point,and then the repair effect begins to decrease.The application of hydraulic concrete can effectively improve the mechanical properties of concrete by controlling the particle size of microcapsules,and timely self repair when the concrete is damaged.

关 键 词：微米级微胶囊 自修复 抗压强度 抗折强度 损伤恢复率 

分 类 号：TV861[水利工程—水利水电工程]