Capping stabilized layer with fly ash and portland cement in transportation infrastructure construction

Abstract

Currently, traditional pavement subgrade materials, such as selected soil used for road construction in the southern region. Many key infrastructure projects have been delayed because no suitable replacement materials for river sand and crushed stone aggregate could be found for pavement base construction. This article presents the results, utilizing red sand and bottom ash as substitutes for river sand and selected soil to form rigid subgrade layers is a promising solution. This paper presents the research findings on the composition of fly ash, bottom ash and red sand aggregates sourced from various locations in the southern region for use as pavement base materials. The research results indicate that key technical criteria, such as compressive strength, splitting tensile strength and elastic modulus, meet the necessary requirements of current standards for use in subgrade layers of pavements. Furthermore, the proposed solution of using red sand, bottom ash and fly ash can reduce construction costs and ensure timely material supply, helping maintain project schedules.

Keywords: Bottom ash, fly ash, red sand, pavement subgrade, road construction.