摘要
为获得水泥砂浆更优的自愈性能,通过试验研究提出了一种水泥砂浆自修复的新方法。试验以水泥熟料为自愈材料,将聚乙烯吡咯烷酮(PVP)作为外包膜,采用硅烷偶联剂(KH550)为两者连接桥,在乙醇环境中组合为可自溶解的类细胞体。通过场发电子显微镜及能谱仪确认水泥熟料外表覆盖PVP薄膜形成类细胞体外观结构。使用激光粒度仪确定类细胞体粒径级配以及PVP外包膜厚度,类细胞体粒径级配符合国家规范,外包膜随PVP添加量增加逐渐增大,在3.82~9.3μm之间变化。试验结果表明,含有类细胞体试样的抗压强度恢复量均大于普通试样,养护28 d时,最大高出普通试样22%。损伤度在类细胞体加入后也出现了更大的下降,类细胞体试样的最优恢复期随外包膜厚度增加而逐渐推迟,添加类细胞体试样较普通试样内部孔隙组成也更加优化。
In order to obtain better self-healing properties of cement mortar,a new method for ce⁃ment-based mortar self-repairing is proposed through experimental study.In the experiment,cement clinker was used as the self-healing material,taking polyvinylpyrrolidone(PVP)as the outer membrane,and si⁃lane coupling agent(KH550)as the bridge between the two materials,which can be combined into a self-dissolving cell-like body in an ethanol environment.A field electron microscope and an energy spec⁃trometer were used to confirm that the surface of the cement clinker was covered with a PVP film to form a cell-like appearance structure.A laser particle size analyzer was used to determine the cell-like body par⁃ticle size gradation and the thickness of the PVP outer envelope.The cell-like body particle size gradation conformed to the national standard,and the outer envelope gradually increased with the addition of PVP,varying from 3.82μm to 9.3μm.The experimental results show that the compressive strength recovery of sam⁃ples containing cell-like bodies is greater than that of ordinary samples,and the maximum is 22%higher after 28 days of curing.The degree of damage also showed a greater drop after the addition of cell-like bodies.The optimal recovery period of the sample with the addition of cell-like bodies is gradually delayed as the thickness of the outer envelope increases.The internal pore composition of the added cell-like sam⁃ple is more optimized than the ordinary sample.
作者
郭皓隆
李昊
张园
张卓森
孙常伟
GUO Haolong;LI Hao;ZHANG Yuan;ZHANG Zhuosen;SUN Changwei(College of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China;Inner Mongolia Technical College of Construction,Hohhot 010070,China)
出处
《水利学报》
EI
CSCD
北大核心
2021年第11期1332-1339,共8页
Journal of Hydraulic Engineering
基金
内蒙古自然科学基金项目(2021MS05045)
内蒙古教育厅重点项目(NJZZ18044)
内蒙古农业大学博士启动费(RZ1900002013)。
关键词
自修复
水泥熟料
聚乙烯吡咯烷酮
粒径级配
类细胞体
self-healing
cement clinker
polyvinylpyrrolidone
particle size grading
cell-like body
