Mechanical performance of Fly Ash based Geopolymer (FAG) as road base stabilizer
Journal
Materials
ISSN
1996-1944
Date Issued
2022
Author(s)
Andrei Victor Sandu
Gheorghe Asachi Technical University of Iasi
Thanongsak Imjai
Walailak University
Petrica Vizureanu
Gheorghe Asachi Technical University of Iasi
Mohd Rosli Mohd Hasan
Mohammad Almadani
King Abdulaziz University
Ikmal Hakem Ab Aziz
DOI
10.3390/ma15207242
Handle (URI)
Abstract
This study examines the strength development of fly ash-based geopolymer (FAG) as a stabilizer for road base material for pavement construction. In the last decade, there has been a rapid development of conventionally treated bases, such as cement-treated bases. However, a major problem with this kind of application is the shrinkage cracking in cement-treated bases that may result in the reflection cracks on the asphalt pavement surface. This study explores the effects of FAG on base layer properties using mechanistic laboratory evaluation and its practicability in pavement base layers. The investigated properties are flexural strength (FS), unconfined compressive strength (UCS), shrinkage, and resilient modulus (RM), as well as indirect tensile strength (ITS). The findings showed that the mechanical properties of the mixture enhanced when FAG was added to 80–85% of crushed aggregate, with the UCS being shown to be a crucial quality parameter. The effectiveness of FAG base material can have an impact on the flexible pavements’ overall performance since the base course stiffness directly depends on the base material properties. As a stabilizing agent for flexible pavement applications, the FAG-stabilized base appeared promising, predicated on test outcomes.
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