Improving Engineering Properties of Expansive Soils of Addis Ababa by Blending with Pozzolanic Sand Found around Meki Town
| dc.contributor.advisor | Samuel, Tadesse (PhD) | |
| dc.contributor.author | Wolde, Ketema | |
| dc.date.accessioned | 2021-10-01T04:40:54Z | |
| dc.date.accessioned | 2023-11-11T12:51:20Z | |
| dc.date.available | 2021-10-01T04:40:54Z | |
| dc.date.available | 2023-11-11T12:51:20Z | |
| dc.date.issued | 2020-12 | |
| dc.description.abstract | Black Cotton Soils exhibit high swelling and shrinking when exposed to changes in moisture content and are most troublesome soils leading to failure of civil engineering structures constructed on such soils. The purpose of this study is to investigate the effect of pozzolanic sand on improving the engineering properties of expansive soil collected from Addis Ababa around Koyefeche condominium site. In this research, pozzolanic sand found around Meki Town was used to treat problematic expansive soil. The pozzolanic sand used for treating the expansive soil was pulverized to pass certain sieve sizes. In this particular research, to consider the size effect of pozzolanic sand on treating the expansive soil, pozzolanic sand passing 150μm and 75μm sieve size were used to treat the expansive soil. The pozzolanic sand crushed to a size less than 150μm was blended to the soil up to 25% at 5% percentage increments whereas the pozzolanic sand crushed to a size less than 75μm was blended with soil to a maximum of 15% at 2.5% percentage increments by dry weight of the soil. Soil treated with the pozzolanic sand showed improvements to plasticity, strength and swelling. As soil is treated with pozzolanic sand the plasticity of the soil decreased, the dry density of the soil increased, the optimum moisture content decreased and the swelling pressure also decreased. Besides, the compressive strength of the soil increased as the percentage of pozzolanic sand is increasing. For the sizes of pozzolanic sand considered the pozzolanic sand crushed to a size less than 75μm improved the engineering properties of expansive soil than the pozzolanic sand crushed to a size less than 150μm when blended with the expansive soil. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/28023 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Expansive Soil | en_US |
| dc.subject | Pozzolanic Sand | en_US |
| dc.subject | Soil Improvement | en_US |
| dc.subject | Atterberg Limit | en_US |
| dc.subject | Compaction | en_US |
| dc.subject | Swelling Pressure | en_US |
| dc.subject | UCS | en_US |
| dc.subject | Free Swell Value | en_US |
| dc.title | Improving Engineering Properties of Expansive Soils of Addis Ababa by Blending with Pozzolanic Sand Found around Meki Town | en_US |
| dc.type | Thesis | en_US |