1 A Sustainable Road Construction Material For Low Volume Roads W. K. Mampearachchi Senior Lecturer, Department of Civil Engineering, University of Moratuwa Email: wk.mampearachchi@gmail.com M. M. D. V. Gunatilake Postgraduate Research Student, Department of Civil Engineering, University of Moratuwa Email: dhanuvida@yahoo.com Abstract The need of spending highway investments more efficiently is greater than ever before, due to escalation of prices of the conventional paving materials (asphalt, concrete). Hence, the road designers are in the verge of using alternative materials for the road construction which brings sustainable living conditions. Thus, focus has been on “Concrete Block Paving (CBP)”, a road construction methodology which is based on ancient road construction technology “Stone Paving”. In general, the applications of CBP are categorized according to the traffic condition as non-traffic, light traffic, medium traffic and heavy & very heavy traffic. The results of the study indicate that the life cycle cost of CBP is lower than the other paving materials although the initial construction cost is slightly high. When the performance of the three types of paving materials are evaluated, in addition to the low life cycle cost, the ability of accommodating and maintaining utility services, thermal comfort, aesthetic appearance and environmentally friendly behaviour can be highlighted as the key advantages of CBP. Key words: Concrete Block Paving (CBP), Interlocking mechanism, Sustainable road construction materials Introduction The past century has revealed an intense process of urbanization which has resulted for the rapid construction of roads and the infrastructure development. Different materials have been used as the road surfacing in these rapidly constructed roads, since the surface of the road should have the strength to withstand the vehicle load and resistance to wearing. At the same time it should be durable. Asphalt is the road surfacing material which is widely used in every type of road. The viscous nature of the bitumen binder allows asphalt to withstand a certain amount of plastic deformation, although it is possible for fatigue failure due to repeated loading for a longer duration. Eventually, concrete also became a widespread road surfacing material for road construction. Concrete surfaces are created using a mix of cement, sand, coarse aggregates and water. Concrete roads became popular due to the higher strength and durability than asphalt roads. Higher construction cost could be stated as a drawback of this construction method.