The Use of Natural Pozzolana (Volcanic Ash) to Stabilize Cinder Gravel for a Road Base (Along Modjo - Ziway Route)
| dc.contributor.advisor | Tadesse, Samuel (PhD) | |
| dc.contributor.author | Teshome, Thomas | |
| dc.date.accessioned | 2018-06-27T11:42:52Z | |
| dc.date.accessioned | 2023-11-11T12:51:35Z | |
| dc.date.available | 2018-06-27T11:42:52Z | |
| dc.date.available | 2023-11-11T12:51:35Z | |
| dc.date.issued | 2015-11 | |
| dc.description.abstract | In road construction using locally available materials plays a significant role in cost and time saving of road construction projects. Cinder gravel is abundantly available in different parts of Ethiopia. However, its use has been to limited purposes due to its light weight, rough surfaces and high porosity. In this study two types of Natural Pozzolana‟s were collected from Ziway Area. One was Pumice (coarser) and the other was volcanic ash (Pumicite). Pozzolanicity test was conducted on both samples using strength activity index test. For the Pumice the strength activity index value was 89.17% while for the volcanic ash (Pumicite) it was 76.43%. Since the volcanic ash (Pumicite) satisfies the minimum requirement for pozzolanicity and is finer, it was used as a stabilizer. From the unconfined compression test conducted on two specimens of the volcanic ash (Pumicite), the average UCS value increases from 84.65 kPa to 266.63 kPa for 3 and 7 curing days, respectively. The cinder gravel is blended with 0, 4, 8, 12, 16, 20, and 24% by mass of volcanic ash (Pumicite). Compaction, California Bearing Ratio, Gradation, Atterberg limit, Los Angeles Abrasion, Aggregate Crushing Value, Ten Percent Fines Value, Absorption and Specific gravity tests were conducted in the laboratory. From the laboratory test results of moisture content vs. density relationship, it has been observed that the optimum amount of natural pozzolana (volcanic ash) is 20% by mass proportion at a density of 1.76g/cc. Air curing technique was used for the soaked and unsoaked condition where the stabilized samples were covered with a polyethylene sheet and kept in a normal air temperature and out of water intrusion during the a curing period of zero, three, seven, fourteen and twenty eight days. For the optimum blending proportion; the range of soaked CBR increases from 98% to 245% whereas for the unsoaked condition the CBR increases from 118% to 307%, for 0 to 28 days curing. Key Words: Air Curing, CBR, Cinder Gravel, Compaction, Natural Pozzolana, Unconfined Compression | en_US |
| dc.description.sponsorship | Addis Ababa University | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/4158 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Air Curin; CBR;Cinder Gravel; Compaction;Natural Pozzolana;Unconfined Compression | en_US |
| dc.title | The Use of Natural Pozzolana (Volcanic Ash) to Stabilize Cinder Gravel for a Road Base (Along Modjo - Ziway Route) | en_US |
| dc.type | Thesis | en_US |