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| dc.contributor.author | Tesfaye, Mulugeta | |
| dc.date.accessioned | 2020-03-16T07:51:15Z | |
| dc.date.available | 2020-03-16T07:51:15Z | |
| dc.date.issued | 2020-03-15 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/10312 | |
| dc.description.abstract | When African modern construction system establish with the colonization by Europe, it starts with soil investigation trend of western sedimentary soil which is different from African tropical residual soils. Ethiopian soil, as a country located in tropical region needs to be investigated in a tropical weathered residual soil concern than simply adopted sedimentary soil investigation trend. Providing the basic engineering properties of the Tropically Weathered Residual (TWR) soil will lead the government organizations, consulting and contracting firms to accept and practicing the contracting, design and construction works with respect to TWR soils concern. In this study, After site visit, disturbed sample with its natural moisture content were taken in to laboratory. Index properties, compaction and CBR tests have been carried out in the laboratory by altering deterministic parameters and keeping the necessary standard and requirements which is recommended for investigation of tropically weathered residual soils. Besides geochemical tests have been done at Ethiopian geological survey laboratory. Based on modified testing procedures and treatements, the TWR soils basing USCS categorized majority of the soils under group name Elastic Silt while the soils from test pit D only are silty sands; and AASHTO classification system classified soils from test pit A, B, C and E under group classification A-7-5 with Group Index > 20, which are referred as poor subgrade material; while soils from test Pit D-1.5 and D-4.0 are classified as A-7-5 and A-2-7 with group index values 10 and 0 respectively, which are good to be subgrade materials. Using the geochemical test analysis (silicate analysis) result, the soil are laterites and lateritic with a Silica-Sesquioxides Ratio less than two and Wesley’s classification system vii classified the soil as Group-C (c) under a group of soils strongly influenced by clay minerals found only in residual soils. From the laboratory results it is observed that compaction is greatly affected by the compactive effort applied and the slightly affected by depth (laterization). CBR values for fine grained Elastic Silt Soil ranges from 2.49% to 3.80% which is weak and insufficient to bear loads, and the soaked CBR for coarse grained silty sand, taken from test Pit D, ranges from 15.92% to 35.87%. The soils from Test Pit D can be used for subgrade or for embankement construction and can be used as sub base construction material as a laterites, bear in mind that the results and the classifications presented here would have been diffirent if we have used the steps and methods recommended from ERA pavement materials specification manuals. | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Geotechnical Engineering | en_US |
| dc.title | COMPACTION PROPERTIES FOR TROPICAL RESIDUAL SOILS TARGETING IMPROVEMENTS IN ERA HIGHWAY MATERIALS SPECIFICATIONS ALTERNATIVE, CASE IN BURE TOWN | en_US |
| dc.type | Thesis | en_US |
