Abstract
Bottom ash waste is a residual material produced by incinerating Municipal Solid Waste. In this study, an experimental programme was undertaken to investigate the influence of enzyme treatment on the behaviour of bottom ash and limestone blends for use as foundation layers in flexible pavement structures. The research focused on evaluating the blends' resilient modulus, which is the most sought after property in analytical pavement design. Cyclic triaxial compression tests were adopted to determine the materials' resilient moduli. Emphasis was on examining the effect of various parameters, such as bottom ash content, enzyme content, moisture content and curing time on the resilient characteristics of the investigated blends and the parameters' impact on the resulting design of a typical pavement structure. Results showed that the bottom ash blends gave favourable performance as foundation layers in comparison with the control limestone blend.