Assessment of Deflection and In-Situ California Bearing Ratio (CBR) of Clayey Subgrade of Flexible Pavement Reinforced with Waste Tyre Scrap Material
| International Journal of Civil Engineering |
| © 2024 by SSRG - IJCE Journal |
| Volume 11 Issue 1 |
| Year of Publication : 2024 |
| Authors : Sujoy Sarkar, Sumit Kumar Biswas, Saibal Chakraborty |
10.14445/23488352/IJCE-V11I1P103
How to Cite?
Sujoy Sarkar, Sumit Kumar Biswas, Saibal Chakraborty, "Assessment of Deflection and In-Situ California Bearing Ratio (CBR) of Clayey Subgrade of Flexible Pavement Reinforced with Waste Tyre Scrap Material," SSRG International Journal of Civil Engineering, vol. 11, no. 1, pp. 18-30, 2024. Crossref, https://doi.org/10.14445/23488352/IJCE-V11I1P103
Abstract:
This study evaluated the deflection and field or in-situ California Bearing Ratio (CBR) of subgrades in flexible pavements, comparing normal soil subgrades with tyre scrap-modified subgrades. It involved laboratory tests (modified proctor compaction and CBR) for assessing load-bearing capacity and strength and field studies using the Dynamic Cone Penetration Test (DCPT), and Falling Weight Deflectometer (FWD) for in-situ CBR and structural capacity evaluation. DCPT provided in-situ CBR values correlated with those for cohesive soils, while FWD focused on measuring subgrade deflection using the Lower Layer Index (LLI). Results indicated a 37.5% reduction in deflection with the tyre scrap-modified subgrade, demonstrating its potential in road construction for improved durability, cost savings, and waste utilization. This finding suggests the viability of tyre scrap in enhancing road infrastructure sustainably and efficiently.
Keywords:
CBR, DCPT, Deflection, FWD, Subgrade.
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