Subgrade Soil Stabilization Using Bitumen and Locally Available Admixture (RHA)

Abstract

The primary factor in ensuring a stable and durable structure is the stability and strength of its foundation or subgrade. The condition of pavement structures is greatly affected by the properties of the soil layer beneath it. Soils that are either weak or expansive can cause problems for pavement, requiring appropriate stabilization techniques. The stability of the soil beneath the pavement is essential for improving the durability and lifespan of the road surface. This research examines how using bitumen and locally available admixture (RHA) can Enhance the stability of subgrade soils and contribute to the sustainability of local construction projects. In order to study the behavior of weak subgrade soil experiments were carried out on untreated and treated soil samples with different percentages of these materials (2%, 4%, 6%, 8%,10% of bitumen and locally available admixture (RHA) with curing period of 7, 14, 21, 28 days) after compaction test. The primary finding of this study highlighted the importance of bitumen and locally sourced admixture (RHA) to improve the stability of subgrade soil. As a result, this will improve the sustainability, strength of the subgrade soil.