Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 175, Issue -, Pages 277-285Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.04.181
Keywords
Nanomaterials; Compressive strength; Hydration reaction; Paste-aggregate interface; Calcium hydroxide crystal
Categories
Funding
- National Natural Science Foundation of China [41230630, 41471063]
- Key Research Program of Frontier Sciences of Chinese Academy of Sciences [QYZDY-SSW-DQC015]
- 100-Talent Program of the Chinese Academy of Sciences
- Program of the State Key Laboratory of Frozen Soil Engineering [SKLFSE-ZT-23]
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The compressive strengths of concrete containing different contents of nano-SiO2 and nano-TiO2 have been investigated at ages of 3, 7, 21 and 28 days. Scanning electron microscopy and X-ray diffraction are used to evaluate the hydration products and paste-aggregate interface. The results indicate that both nano-SiO2 and nano-TiO2 can act as crystallization centers of calcium hydroxide and as fillers in the empty space, reduce the size of crystal at the interface and improve the compressive strength at 28 days. Also, both of them can react with calcium hydroxide, but only nano-SiO2 can produce C-S-H and enhance the early strength. (C) 2018 Elsevier Ltd. All rights reserved.
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