The effect of asphalt emulsion on the properties of fly ash based geopolymers

Natcha PROMMITYAT; Chiravoot PECHYEN; Pitak LAORATANAKUL; Benya CHERDHIRUNKORN

doi:10.55713/jmmm.v35i2.2182

Authors

Natcha PROMMITYAT Materials Innovation and Technology Program, Faculty of Science and Technology, Thammasat University, Pathumthani, 12120, Thailand
Chiravoot PECHYEN Materials Innovation and Technology Program, Faculty of Science and Technology, Thammasat University, Pathumthani, 12120, Thailand
Pitak LAORATANAKUL National Metal and Materials Technology Center, National Science and Technology Development Agency, Pathumthani, 12120, Thailand
Benya CHERDHIRUNKORN Materials Innovation and Technology Program, Faculty of Science and Technology, Thammasat University, Pathumthani, 12120, Thailand; Research Unit in Sustainable Materials and Circular Economy, Thammasat University, Patumthani, 12120, Thailand

DOI:

https://doi.org/10.55713/jmmm.v35i2.2182

Keywords:

geopolymer, fly ash, Bagasse ash, asphalt emulsion, compressive strength

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 Na

₂

SiO

₃

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.

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