There are millions of kilometers of unsealed roads around the world, managed by a variety of road authorities as well as private owners. Unacceptable levels of dust, poor riding quality, and impassability in wet weather are experienced on much of this global unsealed road network. The use of so-called non-traditional additives (i.e. additives other than cement, lime and bitumen) is one management practice than can be considered to improve unsealed roads until they can be upgraded to a sealed standard. This paper provides a review of the research undertaken on these non-traditional road additives over the last fifty and more years, the effectiveness of that research in terms of the current status of the use of the additives, as well recommendations on the research that needs to be undertaken and the institutional changes that need to be considered before they are more widely used. (a) For the covering entry of this conference, please see ITRD abstract no. E220164.
Samenvatting