Utilization of Low CBR Soil for Flexible Pavements for Low Volume Roads with Robosand Stabilization

Many rural areas in developing countries like India lack adequate and affordable access to transport infrastructure and services. The problem is more persistent in low volume and low CBR value sub-grades. The objective of this project is to evaluate the required flexible pavement for very low volume traffic roads with very low CBR values with practically very low traffic of not more than 30-40 vehicles mostly comprising passenger cars where the level of serviceability is very high. The IRC recommended pavement composition is for unpaved gravel roads in rural areas with low volume traffic. There are various disadvantages associated with construction of the road using gravel like dust generation, and gravel loss over a period of time due to passage of vehicles and inaccessibility during rains and the quality of serviceability is unsatisfactory. Problems with sub grade having low CBR values are stability and large deformations or settlements. A project has been taken up where the CBR of sub grade soil is less, the soil is improved by mechanical stabilization with an additive of robosand. The emphasis of the project is ‘Utilization of low CBR soil for flexible pavements for low volume roads with robosand stabilization’.