California Bearing Ratio (CBR) Value for Expansive Soil Subgrade Stabilized Using Brick Dust-Lime Mixtures
DOI:
https://doi.org/10.65419/albahit.v5i2.136Keywords:
Soil stabilization, Brick Dust, Lime, Compaction, California Bearing RatioAbstract
Expansive clayey soils are widely distributed in the southern semi-arid regions of the world. This study focuses on improving the strength of locally available expansive clayey soil using waste brick dust as a stabilizer and lime (CaO) as an activating agent. This approach provides a practical solution for recycling brick dust while mitigating environmental impacts. To determine the optimal lime content for soil stabilization, Atterberg limits, Modified Proctor, and California Bearing Ratio (CBR) tests were conducted, with 10% brick dust identified as the optimal proportion. To assess its effect on the physical and mechanical properties of expansive soil, varying proportions of brick dust (5%, 10%, 15%, and 20%) were mixed with the natural soil, along with a constant 5% lime content as a source of calcium oxide. The plasticity index results showed that the swell potential of the expansive soil decreased from very high to low when treated with the optimum mixture of 10% brick dust and 5% lime. In contrast, using 15% or 20% brick dust alone reduced the swell potential only from very high to medium. Furthermore, the addition of 10% BD and 5% L increased the CBR value of the natural soil from 4.71% to 22% within one day. Similar improvements were observed when 10% BD and 5% L were added separately. The optimum mixture of 10% BD with 5% L produced even greater results. The CBR value increased significantly after 14 and 28 days of curing. These results demonstrate the suitability of lime and brick dust as effective agents for the stabilization of expansive soil. Based on these results, it can be said that stabilization of expansive soils with brick dust is an effective method, making it suitable for improving the geotechnical parameters.
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