Influence of Curing on the Strength Development of Calcium-Containing Geopolymer Mortar
Abstract
:1. Introduction
2. Experimental
2.1. Materials
Oxide | Percentage (wt %) | ||
---|---|---|---|
Class C fly ash | Class F fly ash | slag | |
SiO2 | 48.2 | 62.29 | 31.23 |
Al2O3 | 18.4 | 15.94 | 17.16 |
Fe2O3 | 3.7 | 6.24 | 1.88 |
CaO | 19.6 | 7.92 | 38.66 |
MgO | 1.1 | 1.57 | 8.6 |
SO3 | 1.7 | – | – |
f-CaO | 5.2 | – | – |
2.2. Design of Mix Proportion
Code | Mole ratio | Mass ratio | NaOH/Ash | ||||
---|---|---|---|---|---|---|---|
SiO2/Al2O3 | Na2O/Al2O3 | Na2O/SiO2 | CaO/SiO2 | H2O/Na2O | Ash/Sand | ||
CF35 | 5.38 | 0.71 | 0.13 | 0.46 | 15.14 | 0.5 | 0.058 |
CF40 | 5.38 | 0.71 | 0.13 | 0.46 | 17.31 | 0.5 | 0.058 |
FFC35 | 7.72 | 0.82 | 0.11 | 0.17 | 15.14 | 0.5 | 0.058 |
FFS35 | 7.31 | 0.82 | 0.11 | 0.17 | 15.14 | 0.5 | 0.058 |
2.3. Specimen Preparation
3. Results and Discussion
3.1. Strength Development of Class C Fly Ash Geopolymer Mortar
3.2. Strength Development of Class F Fly Ash Geopolymer Mortar
4. Conclusions
- (1)
- For the Class C fly ash geopolymers, the early-age (<7 days) strength of oven curing was the highest, followed by that from steam curing conditions at 60 °C for 24 h. Both high temperature curing conditions showed higher strength than standard curing conditions at early age. At later ages, however, standard curing showed comparable or higher mechanical strength.
- (2)
- Addition of slag addition and calcium hydroxide was indicated to improve the strength of Class F fly ash geopolymer at early ages under the standard curing conditions.
Acknowledgments
Conflicts of Interest
References
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Li, X.; Wang, Z.; Jiao, Z. Influence of Curing on the Strength Development of Calcium-Containing Geopolymer Mortar. Materials 2013, 6, 5069-5076. https://doi.org/10.3390/ma6115069
Li X, Wang Z, Jiao Z. Influence of Curing on the Strength Development of Calcium-Containing Geopolymer Mortar. Materials. 2013; 6(11):5069-5076. https://doi.org/10.3390/ma6115069
Chicago/Turabian StyleLi, Xueying, Zheng Wang, and Zhenzhen Jiao. 2013. "Influence of Curing on the Strength Development of Calcium-Containing Geopolymer Mortar" Materials 6, no. 11: 5069-5076. https://doi.org/10.3390/ma6115069