Abstract: For the design of flexible pavement, the sub-grade soil strength is estimated with California Bearing Ratio test IS 2720part (IRC-37-2001). In 1929, this test was developed by California Division of Highway and is used to evaluate the suitability of sub grade and the materials used in sub base and base course. This test can be done in the laboratory as well as in the field. But this conventional CBR testing has low repeatability. It is an expensive and time consuming test. Moreover, it is very difficult to mould the sample at desired insitu density in the laboratory. Therefore, to overcome these problems, the other method (Dynamic Cone Penetrometer) is used in this study. This is an instrument used to evaluate insitu strength of pavement base, sub base and sub grade materials. The CBR values are obtained by conventional method and with the help of Dynamic Cone Penetrometer (DCP) and both the values are correlated to find the conventional CBR value by using DCP in the field. So, with the help of this relationship, it will be easy to get information about the strength of sub grade over the length of road.
Author: Er. Younis Farooq, Prof. Ajay K Duggal, Asif Farooq
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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