期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 356, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2022.129293
关键词
Poly-TA; Flexural strength; Compressive strength; Cement hydration product; S-S bond hydrolysis
资金
- National Science Fund for Distinguished Young Scholars [51825203]
- National Natural Science Foundation of China [52208250, 22172070]
- Shandong Provincial Natural Science Foundation [ZR2022QE006, ZR2020KE002]
- Youth Innovation Project for Colleges of Shandong Province [2019KJA021]
Using organic/inorganic nanocomposites to optimize the microstructures of cement hydration products can improve the mechanical properties of cement-based materials. A novel nanohybrid material modified by a self-healing polymer was synthesized and used as a cement paste improvement agent. This material effectively improves the flexural strength of cement-based materials without negatively affecting their compressive strength.
Using organic/inorganic nanocomposites to optimize the microstructures of cement hydration products at the micro/nanometre scale is a promising method for improving the mechanical properties of cement-based mate-rials. One type of novel nanohybrid material modified by the flexible autonomous healing polymer poly-TA (thioctic acid) was synthesized and used as a highly efficient mechanical improvement agent for cement paste. The nanohybrids linear LNTS-1 and bulk CNTS-2 were synthesized from silane-coupled nanosilica and alpha thioctic acid. Due to the existence of hydrogen bonds, coordination bonds and dynamic covalent S-S bonds, this type of linear poly-TA with a certain amount of calcium content exhibited good self-healing prop-erties. Linear LNTS-1 can effectively improve the macro flexural strength of cement-based materials without a negative effect on their compressive strength. The flexural strength of cement pastes with 1.0 parts per thousand LNTS-1 increased by 11.9%, 15.6%, and 16.9% after curing for 3, 7, and 28 d compared with the control cement paste. The results of adsorption experiments show that nanohybrid LNTS-1 has strong adsorption on calcium ions, which affects the formation of cement hydration products.
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