Abstract
Many tropical countries have areas which are sandy and arid in which there is an increasing demand for roads capable of carrying medium to heavy traffic. This development in traffic over the last decade has given rise to problems for the highway engineer, especially when there is a lack of conventional road building materials such as rock and gravel. In many cases, the bituminous stabilisation of sands is the only practicable method of constructing road-bases but little guidance is available to engineers regarding the design and construction of suitable road-bases and only limited information is available on the behaviour of these materials under stress. This thesis reviews methods of mix-design used in current practice and suggests an alternative method of design judged to be more suitable for sand-bitumen mixes, an indication being given of the manner in which laboratory test results are related to road performance.