A Proposed Framework for Optimised Utilisation of Materials for Low Volume Roads Using the Dynamic Cone Penetrometer

Document pages: 23 pages

Abstract: In order to minimise the cost of constructing lowvolume roads (LVRs), it is essential that optimum use is made of locallyavailable, naturally occurring materials. However, conflicts often arisebetween material acceptability, as defined by conventional test methods andspecifications, and material suitability in terms of actual engineeringperformance as a “fit-for-purpose” road construction material. To avoid suchconflicts, it is crucial to adopt appropriate test methods and specificationsfor selecting construction materials. This paper presents a materialsevaluation framework for optimizing the utilisation of materials in LVRpavements based on the use of the Dynamic Cone Penetrometer (DCP). Thisapproach enables materials to be selected on the basis of their“fitness-for-purpose”. It avoids suitable materials from being rejected basedon one or other of the traditionally specified parameters not being compliedwith, even though their strength, as measured by the DCP penetration rate (DNvalue in mm blow) of the soil, may be adequate. Investigations of theproperties of a wide range of locally available materials that have been usedsuccessfully in the construction of LVRs have confirmed the validity of thematerials evaluation framework.