Abstract
The influence of calcium compounds (CaO and Ca(OH)2) on the mechanical properties of fly ash based geopolymers has been studied. Calcium compounds were substituted in fly ash at 1, 2 and 3 wt%, respectively. Curing of the geopolymers was performed at ambient temperature (20 °C) and 70 °C. Addition of calcium compounds as a fly ash substitute improved mechanical properties for the ambient temperature cured samples while decreasing properties for the 70 °C cured samples. Seven days compressive strength of the ambient temperature cured samples increased from 11.8 (2.9) to 22.8 (3.8) MPa and 29.2 (1.1) MPa for 3% CaO and 3% Ca(OH)2 additions, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 82-88 |
| Journal | Journal of Hazardous Materials |
| Volume | Volume 167 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - 15 Aug 2009 |
| Externally published | Yes |
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