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Volume 42 Number 5 Volume 42 Number 6

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Research articles

ScienceAsia 42(2016): 407-414 |doi: 10.2306/scienceasia1513-1874.2016.42.407

Bioactivity enhancement of calcined kaolin geopolymer with CaCl2 treatment

Saengsuree Pangdaenga, Vanchai Satab, J.B. Aguiarc, F. Pacheco-Torgalc, Jarin Chindaprasirtd, Prinya Chindaprasirtb,*

ABSTRACT:     This paper reports that surface treatment with CaCl2 enhances the bioactivity of a calcined kaolin geopolymer. Calcined kaolin, NaOH solution, sodium silicate solution, and heat curing were used to form geopolymer pastes. A soaked-treatment method was applied to the geopolymer samples using CaCl2 solution as the ion exchange agent. The bioactivity of the material was determined by the simulated body fluid (SBF) in vitro testing method. Scanning electron microscope images showed a dense apatite formation on the treated geopolymer surface after SBF immersion for only 3 days. The CaCl2 treatment promoted compressive strength and enhanced bioactivity by accelerating apatite precipitation and slowing down the rise in pH.

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a Division of Civil Engineering, Faculty of Engineering, Nakhon Phanom University, Nakhon Phanom 48000 Thailand
b Sustainable Infrastructure Research and Development Centre, Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002 Thailand
c C-TAC Research Centre, Department of Civil Engineering, University of Minho, Campus of Azurém, 4800-058, Guimarães, Portugal
d Department of Internal Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002 Thailand

* Corresponding author, E-mail: prinya@kku.ac.th

Received 25 Sep 2015, Accepted 29 Jan 2017