{"title":"Characterization of organic–inorganic interfaces in silanized cementitious thin spray-on liners","authors":"Lianjun Chen, Jinlong Teng, Guoming Liu, Zhaoxia Liu, Xiangfei Cui, Shizheng Bu","doi":"10.1007/s10853-025-10688-x","DOIUrl":null,"url":null,"abstract":"<div><p>Thin spray film formed by cementitious thin spray-on liner (TSL) has a wide range of applications in tunnel support. In order to improve the compatibility of the organic–inorganic interface in cementitious TSLs, silane coupling agents were used to modify the TSLs. In this study, four cementitious TSLs were configured, which were based on styrene-acrylic emulsions and vinyl acetate-ethylene copolymerized adhesive powders (EVA powders), respectively, and silanized with silane coupling agent of type KH-550. Macroscopically, the fresh flowability, compressive strength and flexural strength of TSLs were measured. Microscopic experiments were carried out with the aid of Leica microscope and scanning electron microscope. Thermogravimetric analysis (TGA), X-ray diffraction test (XRD) and low-field nuclear magnetic resonance test (NMR) were also carried out. The macroscopic results revealed that silanization decreased the fresh flowability of TSLs, but improved their compressive and flexural strengths. Microscopically, silanization significantly reduced polymer flocculation and improved the densification of the material. The silane and its derivatives bonded to the inorganic interface and captured polymer molecules, thereby promoting polymer film formation and inhibiting polymer agglomeration. The organic–inorganic interface after silanization exhibited higher strength. TGA showed that in styrene-acrylic emulsions modified cementitious TSL (STSL), silanization led to an increase in CH content, which enhanced the self-repair potential of STSL. In vinyl acetate-ethylene copolymerized adhesive powders modified cementitious TSL (VTSL), silanization consumed additional CH, which was attributed to the fact that the SiO<sub>2</sub> structure formed by polycondensation of silanes could pass through the polymer membrane in VTSL and react with the CH.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":645,"journal":{"name":"Journal of Materials Science","volume":"60 9","pages":"4211 - 4241"},"PeriodicalIF":3.5000,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Science","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s10853-025-10688-x","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Thin spray film formed by cementitious thin spray-on liner (TSL) has a wide range of applications in tunnel support. In order to improve the compatibility of the organic–inorganic interface in cementitious TSLs, silane coupling agents were used to modify the TSLs. In this study, four cementitious TSLs were configured, which were based on styrene-acrylic emulsions and vinyl acetate-ethylene copolymerized adhesive powders (EVA powders), respectively, and silanized with silane coupling agent of type KH-550. Macroscopically, the fresh flowability, compressive strength and flexural strength of TSLs were measured. Microscopic experiments were carried out with the aid of Leica microscope and scanning electron microscope. Thermogravimetric analysis (TGA), X-ray diffraction test (XRD) and low-field nuclear magnetic resonance test (NMR) were also carried out. The macroscopic results revealed that silanization decreased the fresh flowability of TSLs, but improved their compressive and flexural strengths. Microscopically, silanization significantly reduced polymer flocculation and improved the densification of the material. The silane and its derivatives bonded to the inorganic interface and captured polymer molecules, thereby promoting polymer film formation and inhibiting polymer agglomeration. The organic–inorganic interface after silanization exhibited higher strength. TGA showed that in styrene-acrylic emulsions modified cementitious TSL (STSL), silanization led to an increase in CH content, which enhanced the self-repair potential of STSL. In vinyl acetate-ethylene copolymerized adhesive powders modified cementitious TSL (VTSL), silanization consumed additional CH, which was attributed to the fact that the SiO2 structure formed by polycondensation of silanes could pass through the polymer membrane in VTSL and react with the CH.
期刊介绍：
The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
