Effects of Temperature Variation on Hot Mix Asphalt Concrete with Saw Dust Ash Used as Aggregates

Abstract

This study attempts to identify the sensitivity of modified Hot Mix Asphalt concrete for temperature variation. Saw dust ash was used as a partial replacement of the conventional filler used in contemporary road construction with Hot Mix Asphalt concrete. The samples were subjected to two different temperature conditions modelled by a 20-minute period in a hot temperature bath under the tested temperatures of 35°C and 60°C. The filler replacement was based on constant volume exchange and a saw dust ash weight of 30g was introduced to the mix. The Marshall Stability and Flow values of the modified Hot Mix Asphalt mixtures were recorded compared to two distinct control samples each tested under same temperatures as the saw dust ash added samples. According to the study, the saw dust addition will be highly vulnerable to malfunctioning under higher temperature conditions. However, saw dust ash could still be used as a partial filler replacement under low temperatures and for local roads with medium traffic.