摘要
针对多数水泥基材料自修复技术在渗漏水条件下修复物质被冲走、裂缝自修复效果难以达到预期且可修复裂缝宽度较窄的问题,本工作结合物理膨胀修复和化学反应修复的优点,以螯合处理的高吸水性树脂(Chelation super absorbent polymer,C-SAP)为物理修复剂,以反应修复剂(Reactive healing agents,RHA)和高性能混凝土膨胀剂(High performance calcium sulpho aluminate,HCSA)为化学修复剂,设计并制备了一种能在渗漏水条件下快速、高效修复裂缝的自修复颗粒,并改进了自制裂缝水渗透实验装置,开展了自修复颗粒修复效果的事前快速评价,最后采用X射线衍射分析方法分析了修复产物的物相组成。结果表明:自制裂缝水渗透实验装置能在将自修复颗粒应用于水泥基材料前有效且快速地评价颗粒的自修复效果,从而实现自修复颗粒组成的快速优选。当自修复颗粒中m(C-SAP)∶m(RHA)∶m(HCSA)=7.5∶32.5∶60,颗粒掺量为20%和30%时,其能够在672 h时完全封堵0.5 mm的裂缝;颗粒中的m(C-SAP)∶m(RHA)∶m(HCSA)=10∶30∶60且颗粒掺量为30%时,其能够在1008 h时完全封堵0.6 mm的裂缝。在裂缝修复早期,C-SAP解螯合并吸水膨胀,快速封堵裂缝,降低水流量;随后,化学修复物质通过化学反应生成白云石、钙矾石和方解石等结晶产物,从而将裂缝修复。
Under leakage condition,for most self-healing technologies of cement-based materials,the healing products in cracks will be washed away,and the healing of cracks will be less effective than expected.In this study,by combining the advantages of physical and chemical healing,a type of novel self-healing particle that can quickly and efficiently repair the cracks under the leakage condition was prepared and designed,using chelation super absorbent polymer(C-SAP)as physical healing agent and reactive healing agents(RHA),high performance calcium sulpho aluminate(HCSA)as chemical healing agents.Moreover,home-made water penetration experimental device was modified,the healing efficiency of self-healing particles was evaluated in advance.Finally,X-ray diffraction analysis was performed to detect the composition of healing products.The results showed that the home-made water penetration experimental device can effectively evaluate the self-healing efficiency of the particles before using in cement-based materials,which can quickly optimize the composition of self-healing particles.When m(C-SAP)∶m(RHA)∶m(HCSA)=7.5∶32.5∶60 in the self-healing particles,and the volume content of self-healing particles were 20%and 30%,the cracks with a width at 0.5 mm can be completely blocked at 672 h;when m(C-SAP)∶m(RHA)∶m(HCSA)=10∶30∶60 and the volume content of self-healing particles were 30%,crack with a width at 0.6 mm can be completely blocked at 1008 h.In early ages of crack healing,the C-SAP de-chelated and then absorbed water and expanded,thus quickly blocked the cracks and reduced water flow.Subsequently,the chemical healing products,such as dolomlite,ettringite and calcite,were generated by chemical reactions to healing the cracks.
作者
顾春平
双雨竹
马俊涛
周勇
杨杨
刘金涛
金城阳
GU Chunping;SHUANG Yuzhu;MA Juntao;ZHOU Yong;YANG Yang;LIU Jintao;JIN Chengyang(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Zhejiang Key Laboratory of Civil Engineering Structures&Disaster Prevention and Mitigation Technology,Hangzhou 310023,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第15期146-151,共6页
Materials Reports
基金
浙江省重点研发计划(2021C01060)
浙江省自然科学基金(LY22E080014,LY21E080016)
浙江省博士后基金(ZJ2021126)。
关键词
自修复
反应修复剂
高吸水性树脂
高性能混凝土膨胀剂
渗水装置
self-healing
reactive healing agents
super absorbent polymer
high performance calcium sulpho aluminate
water penetration test device
