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Materials 2019, 12(3), 526; https://doi.org/10.3390/ma12030526

Effects of Reactive MgO on the Reaction Process of Geopolymer

1
College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou 510642, China
2
Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510635, China
*
Author to whom correspondence should be addressed.
Received: 30 December 2018 / Revised: 20 January 2019 / Accepted: 1 February 2019 / Published: 10 February 2019
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Abstract

In order to compensate for the shrinkage of geopolymer pastes uniformly, reactive MgO powders are evenly dispersed in the geopolymer. The deformation performance, mechanical properties, microstructure and components of geopolymer pastes with reactive MgO are characterized. The effects of the content and the activity of MgO are discussed. The results indicate that the chemical shrinkage, autogenous shrinkage and drying shrinkage decrease with the addition of reactive MgO. MgO reacted with water, and fine Mg(OH)2 crystals forms as a geopolymer paste. Mg(OH)2 produces uniform expansion, which refines the pore size of pastes and the compressive strength increases. The shrinkage of the geopolymer pastes is thus effectively compensated. View Full-Text
Keywords: reactive MgO; geopolymer; shrinkage; reaction process reactive MgO; geopolymer; shrinkage; reaction process
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Li, Z.; Zhang, W.; Wang, R.; Chen, F.; Jia, X.; Cong, P. Effects of Reactive MgO on the Reaction Process of Geopolymer. Materials 2019, 12, 526.

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