复配渗透结晶材料对防水砂浆自愈合性能的研究  

Study on self-healing properties of waterproof mortar by composite permeable crystalline materials

作　　者：安雪晖[1] 朱超 姚国友 AN Xuehui;ZHU Chao;YAO Guoyou(Tsinghua University,Beijing 100084,China;JiaGushi New Materials Co.Ltd.,Suzhou 215100,China)

机构地区：[1]清华大学,北京100084 [2]佳固士新材料有限公司,江苏苏州215100

出　　处：《新型建筑材料》2024年第12期1-4,12,共5页New Building Materials

基　　金：国家重点研发计划项目(2022YFC3801600)。

摘　　要：为了研究具有自愈合性能的防水砂浆,在高抗渗性防水砂浆的基础上,掺入复配的渗透结晶材料,通过抗渗试验研究硅灰对防水砂浆抗渗性能的影响,通过抗压强度恢复率和相对渗水系数研究不同配比渗透结晶材料对防水砂浆的自愈合性能影响,通过扫描电镜观察防水砂浆裂缝的结晶状态。结果表明:硅灰替代部分水泥可以显著提高砂浆的抗渗性,当硅灰掺量为20%,1.5 MPa水压下,砂浆的7、28 d渗水高度较空白组分别降低61.0%、58.3%;复配比例为m(氢氧化钙)∶m(氟硅酸镁)∶m(EDTA)=2.0∶3.0∶1.5的渗透结晶材料自愈合性能最好,在5%掺量下,相对渗水系数较空白组降低31.0%,抗压强度恢复率比空白组提高15.3个百分点;相比空白组,掺加复配渗透结晶材料的防水砂浆试件裂缝处会产生体积更小、晶体结构更密集的块状或絮状结晶体。In order to study waterproof mortar with self-healing properties,based on high-impermeability waterproof mortar,this paper mixed with a composite penetrant crystal material,studied the influence of silica ash on the impermeability of waterproof mortar through impermeability pressure test,and studied the influence of different proportions of penetrant crystal material on the self-healing properties of waterproof mortar through compressive strength recovery rate and relative permeability coefficient.The crystal state of waterproofing mortar cracks was observed by scanning electron microscope.The results show that the permeability resistance of mortar can be significantly improved by replacing part of cement with silica fume.When the replacement amount of silica fume reaches 20%,the seepage height of mortar at 7 days decreases by 61.0%compared with the blank group at 1.5 MPa pressure.The seepage height of 28 d was 58.3%lower than that of blank group.The self-healing performance of the permeable crystalline material with the ratio of Ca(OH)2∶MgSiF6∶EDTA=2.0∶3.0∶1.5 is the best,and the relative water permeability coefficient is reduced by 31.0%and the compressive strength recovery rate is increased by 15.3 percent point compared with the blank group at 5%.Compared with the blank group,the cracks of the waterproofing mortar specimens with composite permeable crystalline materials will produce smaller volume and denser crystal structure,bulk or flocculent crystals.

关 键 词：渗透结晶 抗渗性能 自愈合 微观形貌 

分 类 号：TU578.1[建筑科学—建筑技术科学]