Abstract

In the recent year researcher are more focusing and working on flexible pavement by using CBR (California Bearing Ratio) Methods. Flexible pavements are constructed of several thicknesses of asphalt or bituminous concrete layers overlying a base of granular material on a prepared subgrade. Periodic evaluation of low-volume urban roads is expected in a developing country like India to prioritise the order of maintenance and reconstruction of the road network. The construction of highways and pavements is crucial in DPR projects. Pavement design is an essential component of the comprehensive engineering analysis. The majority of Indian roads are currently flexible pavements with bituminous layers. Due to a lack of cement in the past, India opted for lightweight pavements with bituminous toppings. The California Bearing Ratio (CBR) test is a penetration test used to evaluate the subgrade strength of roads and pavements. This is the most commonly used approach for flexible pavement design. The CBR value determines the thickness of the various elements that make up a pavement. The present paper is focusing on review study of flexible pavement using CBR methods. It has been observed by the author that CBR is play very important role to design the flexible pavement and also CBR values for the design purpose of flexible pavement as per guidelines of IRC: SP: 37-2001 is taken by many researchers. Author also find that this penetration test that is CBR has been applied on the different structure design. which have diverse properties. The details literature review has been provided by the authors in the present paper.