Optimization of Fly Ash and Granulated Blast Furnace Slag (FA-GBFS) Mixes for Flexible Pavements

Year : 2025 | Volume : 12 | Issue : 02 | Page : 14 19
    By

    Piyush Kumar Pandey,

  • Harsh Rathore,

Abstract

This study investigates the compaction, strength, and permeability characteristics of fly ash (FA) stabilized with granulated blast furnace slag (GBFS) to determine the optimal mix proportions for geotechnical applications. Standard Proctor compaction, unconfined compressive strength (UCS), California Bearing Ratio (CBR), and permeability tests were conducted on FA-GBFS mixtures, with GBFS content varying from 10 to 50% by dry weight. The results indicate that increasing GBFS content enhances the maximum dry unit weight (MDU) and UCS up to 40%, after which further addition leads to a decline. The highest UCS value of 164.51 kN/m² and a peak soaked CBR of 44.72% were observed at a 60% FA and 40% GBFS mix. Permeability values increased with GBFS content but remained below the required threshold for drainage layers. The findings suggest that FA-GBFS mixtures are best suited for use as separation or filtration layers in the lower sub-base of pavement structures, as per IRC 37-2018 and MoRTH specifications. Future research should focus on field validation and long-term durability assessments.

Keywords: Fly ash, granulated blast furnace slag, compaction characteristics, unconfined compressive strength, California bearing ratio, permeability, pavement sub-base

[This article belongs to Journal of Geotechnical Engineering ]

How to cite this article:
Piyush Kumar Pandey, Harsh Rathore. Optimization of Fly Ash and Granulated Blast Furnace Slag (FA-GBFS) Mixes for Flexible Pavements. Journal of Geotechnical Engineering. 2025; 12(02):14-19.
How to cite this URL:
Piyush Kumar Pandey, Harsh Rathore. Optimization of Fly Ash and Granulated Blast Furnace Slag (FA-GBFS) Mixes for Flexible Pavements. Journal of Geotechnical Engineering. 2025; 12(02):14-19. Available from: https://journals.stmjournals.com/joge/article=2025/view=222973


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Regular Issue Subscription Original Research
Volume 12
Issue 02
Received 23/03/2025
Accepted 02/05/2025
Published 07/05/2025
Publication Time 45 Days
104

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