Journal
MATERIALS
Volume 6, Issue 4, Pages 1485-1495Publisher
MDPI AG
DOI: 10.3390/ma6041485
Keywords
geopolymer; class C fly ash; compressive strength; workability; microstructure
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Funding
- Water Resources Key Program of Heilongjiang [HSKY200904]
- Heilongjiang Province Natural Science Foundation [E201157]
- Fundamental Research Funds for the Central Universities [HIT.NSRIF.2010017]
- National Science & Technology Pillar Program [2011BAE14B05-03]
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This paper presents workability, compressive strength and microstructure for geopolymer pastes and mortars made of class C fly ash at mass ratios of water-to-fly ash from 0.30 to 0.35. Fluidity was in the range of 145-173 mm for pastes and 131-136 mm for mortars. The highest strengths of paste and mortar were 58 MPa and 85 MPa when they were cured at 70 degrees C for 24 h. In XRD patterns, unreacted quartz and some reacted product were observed. SEM examination indicated that reacted product has formed and covered the unreacted particles in the paste and mortar that were consistent with their high strength.
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