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Soaked Cbr Value Determination from Laboratory Dcp Test for Addis Ababa Red Clay Soil

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dc.contributor.advisor Tadesse, Samuel (PhD)
dc.contributor.author Mulugeta, Ashenafi
dc.date.accessioned 2018-06-20T06:22:04Z
dc.date.available 2018-06-20T06:22:04Z
dc.date.issued 2016-06
dc.identifier.uri http://localhost:80/xmlui/handle/123456789/1946
dc.description.abstract The CBR test is the most widespread method of determining the bearing strength of pavement materials and is fundamental to pavement design. Almost all road construction manuals of Ethiopia recommend CBR tests for flexible pavement constructions. However, most of low volume roads such as roads built under Universal Rural Road Access Program (URRAP) have been designed, constructed and maintained without performing the required CBR tests. One of the cited reason is that CBR is an expensive test. Hence, this thesis is aimed to introduce the simplest and cheapest way of determining the required CBR values indirectly using DCP tests. In this study DCPI values obtained from the laboratory prepared samples were correlated with soaked CBR values for Addis Ababa red clay soils. In laboratory both CBR and DCP tests were conducted on soil samples remolded in standard CBR molds. The tests were performed for both soaked and un-soaked conditions. Besides, the appropriate soil index tests were conducted for all of the samples. The data analysis was made using a statistical software called SPSS, and a good correlation was obtained between soaked CBR and soaked DCP values and change in moisture content. Using a multiple linear regression for 21 samples, the following empirical equation was developed with 72.9% coefficient of determination. S_CBR = -0.53(CH_DCP_moist) - 0.22(S_DCP) + 19.49 -where; S_CBR and S_DCP are to mean that Soaked CBR and Soaked DCP respectively, and CH_DCP_moist is the difference between the water contents of the sample before & after soaking the remolded sample for DCP tests. en_US
dc.description.sponsorship Addis Ababa University en_US
dc.language.iso en en_US
dc.publisher Addis Ababa University en_US
dc.subject Civil Engineering en_US
dc.title Soaked Cbr Value Determination from Laboratory Dcp Test for Addis Ababa Red Clay Soil en_US
dc.type Thesis en_US

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