Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 247, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.118529
Keywords
Nano-silica; Chemical shrinkage; Volume shrinkage; Cement-based composites
Categories
Funding
- National Key Research and Development Program of China [2017YFB0309905, 2017YFE0120900]
- National Natural Science Foundation of China [51872120, 51702121, 61872419]
- National High-tech Research and Development Program of China (863program) [2015AA034701]
- 111 Project of International Corporation on Advanced Cement-based Materials [D17001]
- Shandong Province Science and Technology Major Project [2015ZDXX0702B01]
- Taishan Scholars Program
- Case Project for Top Outstanding Talents of Jinan
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Nano-materials modified cement-based materials have attracted wide attention due to their advantages of improving early strength and durability. However, few studies have been conducted on influence of nano-materials on chemical shrinkage of paste and volume shrinkage of concrete. Therein, the influence rules of nano-silica on chemical shrinkage of paste and volume shrinkage of concrete and its action mechanism have been explored and discussed. The result indicated that added nano-silica aggravated the chemical shrinkage of paste and volume shrinkage of the concrete. The paste chemical shrinkage and concrete volume shrinkage increased with the amount of nano-silica in particular as presented in early stage. The chemical shrinkage of cement at 3d and 28d increased by 93.7% and 57.5% respectively, when adding 1.2% nano-silica. Correspondingly, the 1d, 7d and 60d volume shrinkage of concrete increased by 82.1%, 66.7% and 16.7% respectively. The action mechanism of shrinkage intensification is mainly the pozzolanic effect, nucleation effect and acceleration hydration effect of nano-silica, which accelerated the cement hydration. (C) 2020 Elsevier Ltd. All rights reserved.
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