水泥基修补材料微观结构定量表征分析  

Quantitative Characterization of the Microstructure of Cementitious Repair Materials

作　　者：杨光[1,2] 滕梦丹 罗薇 井文强 YANG Guang;TENG Mengdan;LUO Wei;JING Wenqiang(School of Human Settlements and Civil Engineering,Xi’an Eurasia University,Xi’an 710065,China;Engineering Research Center of Urban Intelligent Construction,Universities of Shaanxi Province,Xi’an 710065,China)

机构地区：[1]西安欧亚学院人居环境学院,陕西西安710065 [2]城市智慧建造陕西省高校工程研究中心,陕西西安710065

出　　处：《粉煤灰综合利用》2024年第6期6-13,共8页Fly Ash Comprehensive Utilization

基　　金：2022年陕西省大学生创新创业项目(S202212712001);西安欧亚学院技术服务专项项目(OYGJS-2021007);西安欧亚学院科研创新团队(2021XJD01);西安欧亚学院科研平台(2022XJPT01)。

摘　　要：该研究旨在探究纳米二氧化硅(NS)和聚乙烯醇纤维(PVA)对水泥基三元修补材料流动性及力学性能的影响,并利用计算机断层扫描(CT)技术与DRAGONFLY图像处理平台对修补材料的孔隙结构进行三维重建和定量表征。研究选用普通硅酸盐水泥(OPC)、铝酸盐水泥(CAC)和二水石膏(CS)作为胶凝材料,通过改变NS和PVA的掺量,分析其对修补材料性能的影响。结果表明:NS的最佳掺量为3%,此时修补材料的28 d抗压强度较三元体系提高了9.4%,而PVA的最佳掺量为0.75%,能显著提升修补材料的抗折和抗压强度。CT扫描和三维重建揭示了不同掺量下试件内部孔隙结构的空间分布特征,其中NS的加入显著降低了孔隙率,而PVA的加入则增加了孔隙率。本研究为水泥基修补材料的优化提供了实验依据,并对理解材料内部结构与宏观性能的关系提供了新视角。The aim of this study is to investigate the effects of nanosilica(NS)and polyvinyl alcohol fiber(PVA)on the flow and mechanical properties of cementitious ternary repair materials,and to reconstruct the pore structure of the repair materials in three dimensions and quantitatively characterize them using computed tomography(CT)technology and DRAGONFLY image processing platform.Ordinary silicate cement(OPC),cement aluminate(CAC)and gypsum dihydrate(CS)were selected as cementitious materials for the study,and their effects on the properties of the repair materials were analyzed by changing the dosage of NS and PVA.The results showed that the optimal dosage of NS was 3%,at which the 28 days compressive strength of the repair material increased by 9.4%compared with the ternary system,while the optimal dosage of PVA was 0.75%,which could significantly improve the flexural and compressive strength of the repair material.CT scanning and three-dimensional reconstruction revealed the spatial distribution characteristics of the internal pore structure of the specimens under different dosages,in which the addition of NS significantly reduced the porosity,while the addition of PVA increased the porosity.The addition of NS significantly decreased the porosity,while the addition of PVA increased the porosity.This study provides an experimental basis for the optimization of cementitious repair materials and a new perspective for understanding the relationship between the internal structure and macroscopic properties of materials.

关 键 词：修补材料 纳米二氧化硅 聚乙烯醇纤维 CT扫描 定量表征 

分 类 号：TU528.59[建筑科学—建筑技术科学]