摘要
为研究生石灰和硫铝酸钙类膨胀剂影响基体自修复能力的作用特点,通过测试裂缝宽度和透水性评估了3种砂浆试件的修复效果,并利用扫描电镜及能谱分析研究裂缝修复物质的微观形态和元素组成.结果表明:随着修复时间的增加,裂缝的修复程度逐渐增大,而试件透水性逐渐减小,且两者具有较好的相关关系;初始裂缝宽度越小,裂缝的自修复程度越高,材料基体的透水性降低越快;生石灰对龄期0~28 d内基体的自修复能力提升明显,但对28 d后的提升作用有限;膨胀剂对龄期7~28 d内基体的自修复能力有提升,但对龄期7 d前及28 d后基体的自修复能力却具有一定的负面作用;内掺生石灰试件的修复物质主要为碳酸钙,而内掺膨胀剂试件的修复产物包括碳酸钙、钙矾石、水化硅酸钙及水化硅铝酸钙.
To explore the effects of quicklime and calcium sulphoaluminate expansive agents on the self repairing ability of matrix,the repair effects of three kinds of mortar specimens were evaluated by testing the crack width and water permeability,and the micro-morphology and the element composition of crack repairing materials were studied by scanning electron microscope and energy-dispersive X-ray spectroscopy(SEM-EDS).The results show that,with the increase of healing time,the healing degree of the crack increases gradually,while the water permeability of the specimen decreases gradually,and they have a good correlation.Moreover,the smaller the initial crack width is,the higher the self-healing degree of the crack is,and the faster the water permeability of the material matrix decreases.Besides,the quicklime significantly improves the self-healing ability of matrix from the age of 0-28 d,but has a limited effect on that of the matrix after the age of 28 d;while expansive agent had a certain improvement on the self-healing ability of matrix from the age of 7-28 d,but had a certain negative effect on that of the matrix before the age of 7 d and after the age of 28 d.The calcium carbonate is the main repair material for the specimens with quicklime,while calcium carbonate,ettringite,calcium silicate hydrate,and calcium silicate aluminate hydrate are the repair products of the specimens with expansive agent.
作者
常洪雷
陈繁育
曲明月
程梦莹
王剑宏
刘健
Chang Honglei;Chen Fanyu;Qu Mingyue;Cheng Mengying;Wang Jianhong;Liu Jian(School of Qilu Transportation,Shandong University,Jinan 250002,China;School of Civil Engineering,Shandong University,Jinan 250061,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第6期1014-1022,共9页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51908327)
山东省自然科学基金资助项目(ZR2019QEE017)
山东大学基本科研业务费专项资金资助项目(31560078614117).
关键词
自修复
生石灰
膨胀剂
修复程度
透水性
self-healing
quicklime
expansive agent
healing degree
water permeability
