Suitability of Demolished Concrete Waste in Hot Mix Asphalt Concrete for Local Roads in Sri Lanka

抄録

The higher cost incurred for materials is a prime concern for the absence of popularity for HMA in upgrading local roads. In the sense, Demolished Concrete Waste (DCW) could be a feasible alternative to fulfill the requirement of virgin aggregate in Hot Mix Asphalt (HMA). Hence, this study focused on inspecting whether the properties of HMA, modified by DCW, meets the specifications for local roads in Sri Lanka. Accordingly, Marshall Mix design was conducted for selected replacement percentages of coarse aggregates and the results indicated that although the Marshall stability reduces with the addition of DCW, the value is within the acceptable range of the local specifications. Moreover, despite the Marshall Flow increases with the addition of DCW as coarse aggregate, it does not exceed the specified limits. Hence, it seems that DCW is a feasible option to replace the coarse aggregate in HMA. Nevertheless, this study should be furthered to evaluate the performance factors of HMA with DCW, such as skid resistance, in order to ensure safety and durability.