Journal
MATERIALS
Volume 6, Issue 11, Pages 5069-5076Publisher
MDPI
DOI: 10.3390/ma6115069
Keywords
geopolymer mortar; fly ash; calcium; curing conditions; strength development
Categories
Funding
- National Natural Science Foundation of China [51378158]
- Water Resources Key Program of Heilongjiang [HSKY200904]
- Heilongjiang Province Natural Science Foundation [E201157]
- China Postdoctoral Science Foundation [2013M541385]
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This paper investigated the curing effects on the mechanical properties of calcium-containing geopolymer mortar. Three precursors are used: Class C fly ash, Class F fly ash plus calcium hydroxide and Class F fly ash plus slag. Curing conditions included: (1) standard curing at 20 +/- 3 degrees C and RH 95% (C); (2) steam curing at 60 degrees C for 24 h (S); (3) steam curing at 60 degrees C for 6 h (S6); and (4) oven curing at 60 degrees C for 24 h (O), then the latter three followed by the standard curing. Under the standard conditions, the flexural strength and compressive strength of Class C fly ash geopolymer mortars developed quickly until the age of 7 days, followed by a gradual increase. Specimens with Class F fly ash plus Ca(OH)(2) showed slow increase till the age of 28 days. Under these non-standard conditions (2-4), all specimens showed higher 3-day strength, while later strengths were either higher or lower than those in standard conditions, depending on the type of the precursor.
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