Faculty of Science and Technology, Thammasat University, Pathumthani, 12120, Thailand; National Metal and Materials Technology Center, National Science and Technology Development Agency, Pathumthani, 12120, Thailand; Research Unit in Sustainable Materials and Circular Economy, Thammasat University, Patumthani, 12120, Thailand
Type
Article
Source Title
Journal of Metals, Materials and Minerals
ISSN
8576149
Year
2025
Volume
35
Issue
2
Open Access
All Open Access; Hybrid Gold Open Access
Publisher
Chulalognkorn University
DOI
10.55713/jmmm.v35i2.2182
Abstract
This research aimed to study the effect of asphalt emulsion (AE) on the properties of fly ash based geopolymers. Solid waste materials used for the production of geopolymer were coal fly ash (FA) 70 wt% and bagasse ash (BA) 30 wt%. Alkaline solution used for the geopolymerization reaction was the mixture of 10 M NaOH and Na2SiO3 with the ratio of 1:2. The liquid and solid (L/S) ratios of 0.6, 0.7 and 0.8 were prepared. The AE of 1 wt%, 3 wt% and 5 wt% were added into the raw materials mixtures. Then, the mixed slurry was casted into a mold for the further tests. The setting time was determined using VICAT. After ageing of 7 day, 14 day, and 28 day, the compressive strength and modulus of rupture (MOR) samples were measured. The results of the study revealed that the sample with the L/S ratio of 0.7 had the best mechanical properties. The additional of AE up to 3 wt% led to an improvement of mechanical properties where the 1 wt% of AE gave the highest compressive strength, Young’s modulus and MOR. Bulk density and %water absorption, were determined. Phase structures, chemical structures and microstructures were observed using XRD, FTIR and SEM techniques, respectively. Copyright (c) 2025 Journal of Metals, Materials and Minerals. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
