Abstract:
Major parts of the eastern and northern province of Sri Lanka are covered cohesionless soil. Utilization of locally available soil for the construction of the subbase of the roads will optimize the cost and reduce the adverse environmental impact. Recently cracks settlements and sandy soils. It is suspected that the usage of locally available soil would have caused this failure.
Objective of the study is to assess the quality of the cohesionless soil as a highway construction
material . Futher the applicability and validity of the currently used specifications for use of
cohesion ess so' as a highway construction material are also evaluated. To accomplish the above
tasks, the experience of the construction industry in this regard was gathered through site visits, case
studies, interviews with relevant personel. Based on the collected information, a comprehensive
laboratory test program was formulated to investigate the interrelationships between the soil
properties such as grading, maximum dry density, CBR value, plasticity’ index, and liquid limit by
mixing different types of clays with pure coarse sand. Laboratory test results and data collected from
road construction project were analysed. Final results were reviewed by the senior consultant at RDA
and NBRO.
Citation:
Suvetha, B., Tharaka, D.G.S., Ranasinghe, J.A.C.L., Mampearachchi, W.K., & Thilakarisi, S. (2011). Study on the possible improvements if ICTAD specification for cohesionless soil to be used as a highway construction material. In N. Ratnayake (Ed.), Proceedings of the Civil Engineering Research for Industry Symposium 2011 (pp. 79-82). Department of Civil Engineering, University of Moratuwa.