Effects of delay time and curing temperature on compressive strength and porosity of ground bottom ash geopolymer mortar

Authors

  • Nattapong MAKARATAT Department of Civil and Environmental Engineering Technology, College of Industrial Technology, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
  • Sumrerng RUKZON Department of Civil Engineering, Faculty of Engineering, Rajamangala University of Technology Rattanakosin Thailand
  • Prinya CHINDAPRASIRT Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand

DOI:

https://doi.org/10.55713/jmmm.v31i3.1186

Keywords:

Bottom ash, Geopolymer material, No-delay and delay times of curing, Heat curing, Porosity, Compressive strength

Abstract

This research investigated development of ground bottom ash (GBA) for a new geopolymer material. The compressive strength and porosity of the geopolymer mortar containing GBA were tested. The GBA-based geopolymer mortar mixtures were designed by control liquid to GBA ratio for all tests. Extra water was also used to maintain the workability of geopolymer mortar. The sodium hydroxide (NaOH) concentrations of 10 M and 15 M were used. Furthermore, sodium silicate (Na2SiO3) to sodium hydroxide (NaOH) ratios by mass such as 0.50, 1.50 and 2.50 were also used as alkali activator solutions. Effects of delay time and no-delay time, heat curing as well as the concentrations of NaOH and Na2SiO3 to NaOH ratios on compressive strength and porosity of the GBA geopolymer mortar were investigated. It was found that the increasing of NaOH concentration and Na2SiO3 to NaOH ratio reduce the workability of GBA geopolymer mortar. The high concentration of NaOH at 15 Molar gave the compressive strength at 1 day higher than that of GBA geopolymer mortar with low NaOH of 10 M. Furthermore, the GBA geopolymer mortar with high Na2SiO3 to NaOH ratio at 2.5 gave the highest compressive strength. 15 M-2.5 Si/Na mortar with delay time before heat curing at 75℃ gave the highest compressive strength of 23.0 MPa at 1 day. Moreover, the porosity of GBA geopolymer mortar was related to its compressive strength. The GBA binder is a new geopolymer material with good properties for concrete work. 

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Published

2021-09-28

How to Cite

[1]
N. MAKARATAT, S. RUKZON, and P. CHINDAPRASIRT, “Effects of delay time and curing temperature on compressive strength and porosity of ground bottom ash geopolymer mortar”, J Met Mater Miner, vol. 31, no. 3, pp. 134–142, Sep. 2021.

Issue

Vol. 31 No. 3 (2021)

Section

Original Research Articles

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