IMPROVING THE SUBGRADE SOIL STABILITY BY ADDING LIME GYPSUM AND BRICK BALLAST

Abstract

Weak subgrade soils pose a significant challenge to the continuity and stability of road structure due to their low strength and high malleability. This study evaluates the enhancement of subgrade soil stability by incorporating lime, gypsum, and slipup cargo in different blend rates (6:2.5:10), (8:5:20), and (10:7.5:30). Laboratory tests, including Atterberg limits, Modified Proctor Test, unrestrained Compressive Strength (UCS), and California Bearing rate (CBR), were conducted to assess the effectiveness of these stabilizers. The results indicate a substantial improvement in soil parcels. The liquid limit dropped from 39.05 to, while the plastic limit increased from 11.9 to 19.6, reflecting bettered soil thickness. The UCS bettered from 0.8 KN to 1.41 KN, and the CBR increased from 4 to 11, demonstrating a significant increase in cargo- bearing capacity. likewise, the Maximum Dry Density (MDD) bettered, indicating better contraction characteristics. Among the tested rates, the blend of (10:7.5:30) handed the stylish stabilization results. This study concludes that the addition of lime, gypsum, and slipup cargo effectively stabilizes weak subgrade soil, reducing malleability while enhancing strength and contraction parcels. This stabilization fashion presents a sustainable and cost-effective result for perfecting road subgrades, thereby adding pavement life and performance.