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Materials 2013, 6(11), 5069-5076; doi:10.3390/ma6115069
Article

Influence of Curing on the Strength Development of Calcium-Containing Geopolymer Mortar

* ,
 and
*
School of Civil Engineering, Harbin Institute of Technology, Harbin 150006, China
* Authors to whom correspondence should be addressed.
Received: 12 September 2013 / Revised: 23 October 2013 / Accepted: 29 October 2013 / Published: 7 November 2013
(This article belongs to the Section Advanced Composites)
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Abstract

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 °C and RH 95% (C); (2) steam curing at 60 °C for 24 h (S); (3) steam curing at 60 °C for 6 h (S6); and (4) oven curing at 60 °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.
Keywords: geopolymer mortar; fly ash; calcium; curing conditions; strength development geopolymer mortar; fly ash; calcium; curing conditions; strength development
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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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.

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