Speaker
Description
Abstract. Local road pavements are often comprised of thin marginal granu-lar material base courses with a thin bituminous surface. When these pave-ments require rehabilitation, new granular reconstruction is the standard historical approach. However, in recent times, stabilisation of the existing pavement has also become popular. This research calculated seven structur-ally equivalent pavement rehabilitations, including a new granular and two stabilised pavement options, each with sprayed seal and asphalt surface op-tions, as well as a full depth asphalt pavement. The social, financial and en-vironmental cost of each was estimated, and a triple bottom line value was calculated. It was concluded that stabilisation of the existing pavement structure consistently provided the lowest cost solution, whereas new granular pavement reconstruction was consistently the most expensive op-tion. It is recommended that existing pavement stabilisation be the pre-ferred existing pavement rehabilitation for local roads, except where other factors render stabilisation unviable.
