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Advances in Materials Science and Engineering
Volume 2013, Article ID 764180, 9 pages
Research Article

Development and Performance Evaluation of Very High Early Strength Geopolymer for Rapid Road Repair

1Department of Civil Engineering, Prince of Songkla University, HatYai, Songkhla 90112, Thailand
2Department of Mining and Materials Engineering, Prince of Songkla University, HatYai, Songkhla 90112, Thailand

Received 23 February 2013; Revised 11 July 2013; Accepted 13 July 2013

Academic Editor: Dachamir Hotza

Copyright © 2013 Abideng Hawa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


High early strength is the most important property of pavement repair materials to allow quick reopening to traffic. With this in mind, we have experimentally investigated geopolymers using low cost raw materials available in Thailand. The geopolymer mortar was metakaolin (MK), mixed with parawood ash (PWA, rubberwood ash) or oil palm ash (OPA) as binder agent. Rubberwood is often used as raw material for biomass power plants in Thailand, especially at latex glove factories and seafood factories, and burning rubberwood generates PWA. Both PWA and OPA are therefore low cost residual waste, locally available in mass quantities. The geopolymer samples were characterized for compressive strength, drying shrinkage, and bond strength to Portland cement mortar with slant shear test. The experimental design varied the contents of PWA and OPA and the heat curing time (1, 2 and 4 h) after hot mixture process. The hot mixture process resulted in very high early strength. In addition, we achieved high compressive strengths, low drying shrinkage, and very significant bond strength enhancement by use of the ashes.