Information on the feasibility of using ENS roads within a range of Cambodian environments is presented. Existing knowledge is reviewed. Data is collected and analyzed on a range of roads with natural surfaces or unsealed surfaces of poor quality materials.
This review is primarily concerned with the basic behaviour of the 'pavement' itself, defined in this context as the road surfacing and the layers of natural insitu materials in the zone below the surface. The review also concentrates on the use of \"earth\" materials; or those materials whose quality could be categorised as below that which is normally acceptable for use as an unsealed gravel wearing course. Within this definition the overall objective of Task 2 in the SEACAP 19 programme is to define the conditions under which an earth surface is a reasonable choice of road surface type to use. Thus it is assumed that along the route water crossings are adequate for all-year access and that, provided the earth surface is sufficiently durable and socially acceptable, then such a solution can be viable. The purpose of this review is to identify all the principal factors on which the performance of an earth road depends so that a field survey of actual performance in Cambodia can be designed to record values of the important variables and to help define critical limits.
SEACAP 19 Technical Paper No 2, 26 pp.