吸水性微胶囊对砂浆早期抗裂性的影响  

Effect of Water-absorbing Microcapsule on Crack Resistance of Mortar in Early Stage

作　　者：韩磊[1,2] 毛倩瑾[1,2] 伍文文[1,2] 张璐 李润丰 王子明[1,2] 崔素萍[1,2] 

机构地区：[1]北京工业大学材料与制造学部,北京100124 [2]新型功能材料教育部重点实验室,北京100124 [3]北京建筑材料科学研究总院有限公司固废资源化利用与节能建材国家重点实验室,北京100041

出　　处：《混凝土世界》2022年第6期10-15,共6页China Concrete

基　　金：北京市自然科学基金-市教委联合资助项目(KZ202010005013)。

摘　　要：通过赋予自修复微胶囊吸水-释水能力,从而使微胶囊改善混凝土的早期开裂问题。本文通过平板开裂试验测试了环氧/海藻酸钙吸水性微胶囊在不同条件下对砂浆早期抗裂性的影响,采用XRD、NMR等手段分析了微胶囊的微观作用机理。结果表明:吸水性微胶囊具有吸水-保水-释水功能,在砂浆基体中发挥了内养护作用,其释水行为可以有效降低砂浆平板的开裂指数。吸水性微胶囊加快了水泥的水化进程,促进了水泥矿物的水化反应,增加了基体中的C-S-H凝胶。By endowing the ability of water absorption and water release to self-healing microcapsules,the early cracking problem of concrete can be improved by microcapsules.In this paper,the effects of epoxy/calcium alginate hydroabsorbent microcapsules on the early cracking resistance of mortar under different conditions were tested by plate cracking test,and the microscopic mechanism of microcapsules was analyzed by XRD,NMR and other means.The results show that the water-absorbing microcapsules have the functions of water-absorbing,water-retaining and water-releasing,and play an internal curing role in the mortar matrix,and the water-releasing behavior can effectively reduce the cracking index of the mortar plate.The hydrophobic microcapsules accelerate the hydration process of cement,promote the hydration reaction of cement minerals,and increase the C-S-H gel in the matrix.

关 键 词：水泥基材料 吸水性微胶囊 早期抗裂性 自修复 

分 类 号：TU528[建筑科学—建筑技术科学]