The use of Dynamic Cone Penetrometer resulted in an estimated ratio of
soil strength. Dynamic cone penetrometer can also be used as an indicator of
changes in soil moisture in situ testing in accordance through the soil profile.
Research in this study is laboratory test at the Department of Civil Engineering,
Faculty of Engineering, University of Atma Jaya Yogyakarta and DCP test field
(along the Selokan Mataram Road Maguwo - Babarsari to obtain a minimum of
15 samples). The purpose of this research is to find the correlation value of CBR
(California Bearing Ratio) and DCP (Dynamic Cone Penetrometer). The research
divided into two tests, first for the DCP test in order to find the DCP value (mm /
blow). The second test is CBR laboratory test to find the CBR value. CBR and
DCP values are plotted on a graph and then look for the value of its correlation
with a linear regression methods. After correlation CBR - DCP resulting equation
Log CBR = 1.175494 - 0.011362 Log (DCP), the CBR value (%) of each DCP
test locations can be searched by this equation. CBR and DCP correlation values
in this study at location 1 close to the correlation of previous studies by NCDOT
(1998) with the equation log (CBR) = 2.60 – 1.07 log (DCP), and at location 2 to
10 close to the correlation of previous studies by Livneh et . al. (1992) with the
equation log (CBR) = 2.45 – 1.12 log (DCP). From the correlation obtained,
laboratory CBR value can be correlated with value of DCP in the field. From this
correlation obtained the DCP test value every location at the field closed to the
CBR laboratory value with the real condition.