期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 53, 期 -, 页码 503-510出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2013.12.003
关键词
Geopolymer; Metakaolin; Nano-SiO2; SiO2/Na2O molar ratio; Compressive strength; Microstructure
资金
- National Science Council of the Republic of China, Taiwan [NSC 99-2622-E-197-003-CC, 101-2923-I-011-001-MY4]
An alkali-activating solution plays an important role in dissolving Si and Al atoms to form geopolymer precursors and aluminosilicate material. This study explores the effects of the SiO2/Na2O molar ratio (1.0-2.0) on the properties of nano-SiO2 metakaolin-based geopolymers. The setting time, compressive strength, mercury intrusion porosimetry (MIP), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) are investigated to study the properties of the geopolymers. The results show that the compressive strength increased, and that the products of geopolymerization filled pores with curing time, causing the microstructure to become dense. Moreover, a nano-SiO2 metakaolin-based geopolymer sample with a SiO2/Na2O ratio of 1.5 exhibited more strength, higher density, and less porosity. Applying the nano-SiO2 to a geopolymer enhances compactness, improves uniformity, and increases strength. (C) 2013 Elsevier Ltd. All rights reserved.
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