ABSTRACT
Using Cold Recycled Bound Material (CRBM) is a sustainable technique that saves energy and raw material consumption. This technique is widely used in UK roads but its application in airfields is limited as there is no specific pavement design guidance for using CRBM. As part of the author’s research in the SUP&R ITN project this paper proposes appropriate design guidance for using CRBM in airfield pavements. With this aim an analytical approach using a multilayer elastic model (Kenlayer) was used to analyse different airfield pavements with conventional asphalt materials for specific loading and subgrade conditions. First, pavement designs obtained from Kenlayer were compared to those from an existing design guide, namely DMG 27 from Defence Estates, UK, to prove the suitability of the approach and inputs for airfield design purposes. After this, the software was used to analyse pavement structures where CRBM was substituted for asphalt concrete in the base layer. The material properties were assigned based laboratory testing and established design parameters. The results show that different asphalt concrete and CRBM layer thicknesses were needed for the same design conditions, due to the different material properties. This allowed an appropriate factor to be derived to increase the thickness given by DMG27 (or any conventional airfield pavement design method) to account for a CRBM base.
