New insights into the improvement of volume stability: Plant polyphenol modified calcium silicate hydrate (C-S-H)

IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Minghui Jiang , Xiao Liu , Shiyu Li , Yurui Xu , Simai Wang , Lei Lu , Xinxin Li , Xinru Sun , Chunlei Xia , Ziming Wang , Suping Cui
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Abstract

The internal water migration within calcium silicate hydrate (C-S-H) in dry environments is considered to be the primary factor affecting the volume stability of cementitious materials. In this research, the in-situ polymerization product of plant polyphenol tannic acid (TA) was applied to modify C-S-H based on an organic-inorganic composite modification method. The chemical structure, microstructure, composition, dimensional changes and water migration characteristics of modified C-S-H were analyzed. Experimental results showed that TA improved the polymerization degree of siloxane chains in the C-S-H nanostructure, with a maximum improvement of 80.70%, and increased the interlayer spacing in the C-S-H structure, confirming the modification of C-S-H at the nanoscale, exhibited by 29Si Nuclear Magnetic Resonance (NMR), X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM). This modification by TA optimized the C-S-H nanostructure and microscopic pores, and increased the interlayer and gel pore water content, especially gel pore water increased by 56.53% compared to that of the unmodified C-S-H, revealed by nitrogen adsorption and 1H LF-NMR. In the dry environment, the blocking and cladding effects of TA on C-S-H effectively inhibited the gel water loss and reduced the drying shrinkage, especially at low TA concentration. This research aims to improve the volume stability of C-S-H by in-situ polymerization product of plant polyphenol, which provides new insights into improving the volume stability of cementitious materials.

Abstract Image

植物多酚改性水合硅酸钙(C-S-H)提高体积稳定性的新认识
干燥环境下水化硅酸钙(C-S-H)内部水分迁移被认为是影响胶凝材料体积稳定性的主要因素。本研究以植物多酚单宁酸(TA)为原位聚合产物,采用有机-无机复合改性方法对C-S-H进行改性。分析了改性C-S-H的化学结构、微观结构、组成、尺寸变化及水迁移特性。实验结果表明,TA提高了C-S-H纳米结构中硅氧烷链的聚合度,最大提高了80.70%,并增加了C-S-H结构的层间间距,证实了C-S-H在纳米尺度上的修饰,通过29Si核磁共振(NMR)、x射线衍射(XRD)和透射电子显微镜(TEM)进行了表征。氮吸附和1H LF-NMR结果表明,经TA修饰后的C-S-H纳米结构和微观孔隙均得到优化,层间和凝胶孔隙含水量均有所提高,其中凝胶孔隙含水量较未修饰的C-S-H提高了56.53%。在干燥环境下,TA对C-S-H的阻断包覆作用有效抑制了凝胶水分的流失,降低了干燥收缩率,特别是在低TA浓度下。本研究旨在通过植物多酚原位聚合产物提高C-S-H的体积稳定性,为提高胶凝材料的体积稳定性提供新的思路。
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来源期刊
Cement and Concrete Research
Cement and Concrete Research 工程技术-材料科学:综合
CiteScore
20.90
自引率
12.30%
发文量
318
审稿时长
53 days
期刊介绍: Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.
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