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| dc.contributor.author | ERMIAS, PETROS DEGSEW | |
| dc.date.accessioned | 2021-10-21T06:44:51Z | |
| dc.date.available | 2021-10-21T06:44:51Z | |
| dc.date.issued | 2019-09 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/12828 | |
| dc.description.abstract | Making a good quality concrete which satisfies both strength and durability requirements needs great care starting from ingredient selection. The ingredients selected should fulfill the requirements stated in standards. Mixing water is one of the ingredients used and should be suitable for making concrete. In Bahir Dar, there has not been any research made on mixing water and it is not a common practice to test mixing water for the purpose of concrete work. Considering this, a study focusing on mixing water quality is undertaken on active construction projects in Bahir Dar. The research is conducted by collecting data from construction sites using questionnaires and field observations. The sources of water for concrete construction are identified and water samples were collected from the water sources and were tested based on standard lab procedures to identify the constituents. Then, tests on cement setting time were conducted using the identified water sources and from site storages. Besides concrete cubes for a class of concrete of C-30 were prepared using the water sources, site stored water and were tested for compressive strength on their third, seventh and twenty-eighth-day ages. The results of the questionnaire survey showed that there are four main water sources used as mixing water: Abay River, municipal water (potable), groundwater (hand-dug well), and Lake Tana. The impurities found in the water sources were within the specified limit as per the ASTM C94. The tests conducted on the initial and final setting time of cement using each water source and on-site stored water showed an insignificant deviation from the control water source (municipal water). The compressive strength test results on the seventh-day mark indicated that concrete cubes cast using Abay River and groundwater (hand-dug well) had strength less than 90% of the control. Also, for strength test of cubes using onsite stored water shows all water sources had strength below 90% of the control. The compressive strength test results at 28 days mark show that municipal water has the highest strength with 40.6MPa followed by Abay River water with 39.28MPa, ground water 1 with 32.78 MPa, ground water 2 with 37.92 MPa, ground water 3 with 32.08 MPa and Lake Tana water with 33.04MPa. Accordingly, the findings indicate to use municipal and Abay River water sources for concrete construction works. The compressive strength test results of concrete cube made using storage water on the 28th-day mark show municipal water have the highest strength with 41.41 MPa followed by Abay River water with 39.33 MPa, ground water 1 with 33.02 MPa, ground water 2 with 37.33 MPa, ground water 3 with 37.40 MPa and water from Lake Tana with 31.61 MPa. For making concrete construction works in Bahir Dar City the research finding asserts to use Abay River from the source, Abay river and municipal water sources on the construction site for concrete production and curing for the specific projects. | en_US |
| dc.language.iso | en_US | en_US |
| dc.subject | CIVIL AND WATER RESOURCE ENGINEERING | en_US |
| dc.title | SOURCE OF MIXING WATER AND ITS EFFECT ON COMPRESSIVE STRENGTH OF CONCRETE THE CASE OF BAHIR DAR | en_US |
| dc.type | Thesis | en_US |
