Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 267, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.120731
Keywords
Calcium silicate hydrate; Hydroxyl-terminated polydimethylsiloxane; Organic modification; Microstructure; Nuclear magnetic resonance
Categories
Funding
- National Natural Science Foundation of China [51772212, 51468002, 51108341]
- National Key R&D Program of China [2016YFC0700807]
- Fundamental Research Funds for the Central Universities
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Calcium silicate hydrate (C-S-H) is the main hydration product of cement, and its micro-nano-structure significantly affects the properties of cement-based materials. Modifying the structure of C-S-H with PDMS can improve connectivity and morphology, leading to enhanced water contact angles and overall performance of the materials.
Calcium silicate hydrate (C-S-H) is the main hydration product of cement, and its micro-nano-structure has an important influence on the properties of cement-based materials. The disadvantages of cement-based materials are related to the micro-nano-structure defects of C-S-H. The modification of the C-SH structure by silane can make up the defects of C-S-H. Here, we studied the structure of C-S-H modified by a straight-chain silane containing silicon hydroxyl groups at both ends. Calcium silicate hydrate (C-S-H) gel particles modified by hydroxyl-terminated polydimethylsiloxane (PDMS) were synthesized by the sol-gel method. The influence of this organic modification on the structure of C-S-H was investigated by XRD, FTIR, NMR, SEM, TG-DTG and water contact angles techniques. The results show that various sizes of C-S-H gel particles are connected with PDMS via covalent bond. PDMS acts as a bridge between C-S-H particles. The introduction of PDMS changes the morphology of stacked spherical particles to cauliflower-like and increases water contact angle of C-S-H. In addition, various sizes of C-S-H gel particles are also coated by PDMS. This research explains the methods for affecting the stacking process of C-SH gel particles. (C) 2020 Elsevier Ltd. All rights reserved.
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