Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 191, Issue -, Pages 330-341Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.10.037
Keywords
High strength geopolymer; Microstructure; Mechanical properties; Room temperature; Pre-conditioning drying method
Categories
Funding
- National Key Research and Development Program of China [2016YFC0701400]
- Science and Technology Program of Guangzhou, China [201704030057]
- Opening Project of State Key Laboratory of Green Building Materials
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High strength fly ash (FA)-based geopolymer pastes containing slag were characterized by means of X-ray diffraction (XRD), thermogravimetry (TGA), and environmental scanning electron microscopy (ESEM). Various ratios of FA were replaced with ground granulated blast furnace slag (GGBS) to enhance the early strength development of the geopolymers cured at room temperature. Compressive and flexural strength tests were conducted to determine the mechanical properties, and mercury intrusion porosimetry (MIP) measurements were carried out to investigate the microstructure of the hardened geopolymers. A new pre-conditioning drying method for MIP investigations was applied and its effects on the GPs' microstructure were evaluated. The comparison of results showed that freeze-drying by using liquid nitrogen could be a great alternative to the conventional drying methods for geopolymers. The compressive and flexural strengths of geopolymers containing slag reached up to around 100 MPa and 10 MPa, respectively. The decreasing porosity of the geopolymers correlated well with the obtained increasing values of the compressive strength. However, neither of them noticeably improved when over 50% of FA was replaced by GGBS, while a further increase in the flexural strength was observed. (C) 2018 Elsevier Ltd. All rights reserved.
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