Stabilization of Recycled Concrete Aggregate Using High Calcium Fly Ash Geopolymer as Pavement Base Material

Sermsak Tiyasangthong; Piyathida Yoosuk; Kitsada Krosoongnern; Ratchanon Sakdinakorn; Wisitsak Tabyang; Worawit Phojan; Cherdsak Suksiripattanapong

doi:10.3390/infrastructures7090117

Infrastructures (Sep 2022)

Stabilization of Recycled Concrete Aggregate Using High Calcium Fly Ash Geopolymer as Pavement Base Material

Sermsak Tiyasangthong,
Piyathida Yoosuk,
Kitsada Krosoongnern,
Ratchanon Sakdinakorn,
Wisitsak Tabyang,
Worawit Phojan,
Cherdsak Suksiripattanapong

Affiliations

Sermsak Tiyasangthong: Infrastructure and Rail Transportation Technologies Research Unit, Department of Civil Engineering, Faculty of Engineering and Technology, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand
Piyathida Yoosuk: Infrastructure and Rail Transportation Technologies Research Unit, Department of Civil Engineering, Faculty of Engineering and Technology, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand
Kitsada Krosoongnern: Infrastructure and Rail Transportation Technologies Research Unit, Department of Civil Engineering, Faculty of Engineering and Technology, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand
Ratchanon Sakdinakorn: Infrastructure and Rail Transportation Technologies Research Unit, Department of Civil Engineering, Faculty of Engineering and Technology, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand
Wisitsak Tabyang: Department of Civil Engineering, Faculty of Engineering, Rajamangala University of Technology Srivijaya, Songkhla 90000, Thailand
Worawit Phojan: Department of Civil Engineering, Faculty of Engineering, Northeastern University, Khon Kaen 40000, Thailand
Cherdsak Suksiripattanapong: Infrastructure and Rail Transportation Technologies Research Unit, Department of Civil Engineering, Faculty of Engineering and Technology, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand

DOI: https://doi.org/10.3390/infrastructures7090117
Journal volume & issue: Vol. 7, no. 9
p. 117

Abstract

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This research investigated high calcium fly ash geopolymer stabilized recycled concrete aggregate (RCA-FAG) as pavement base material. The effect of recycled concrete aggregate (RCA):high calcium fly ash (FA) ratios, sodium silicate (Na2SiO3):sodium hydroxide (NaOH) ratio, and curing time on the unconfined compressive strength (UCS) and scanning electron microscope (SEM) properties of RCA-FAG samples were evaluated. The maximum dry unit weight of the RCA-FAG sample was 20.73 kN/m3 at RCA:FA ratio of 80:20 and Na2SiO3:NaOH ratio of 60:40. The 7-d UCS of RCA-FAG samples increased as the FA content and Na2SiO3:NaOH ratio increased. The 7-d UCS of the RCA-FAG sample was better than that of the RCA with no FA because FA particles filled in RCA particles, resulting in a dense matrix. The 7-d UCS of RCA-FAG samples passed the 7-d UCS requirement for the low-traffic road. All ingredients met the 7-d UCS requirement for the high-traffic road except the sample with RCA:FA of 100:0 and Na2SiO3:NaOH of 50:50 and 60:40. The 7-d SEM images indicated that spherical FA and RCA particles are bonded together, resulting in the dense matrix for all Na2SiO3:NaOH ratios. The proposed equation for predicting the UCS of RCA-FAG offered a good coefficient of correlation, which is useful in designing pavement base material from RCA-FAG material.

Published in Infrastructures

ISSN: 2412-3811 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology
Website: http://www.mdpi.com/journal/infrastructures

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