Civil Engineering
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Item EVALUATION OF MICRO AND SMALL ENTERPRISES PERFORMANCE IN 20/80 CONDOMINUM HOUSING CONSTRUCTION: THE CASE OF GULELE SUB-CITY, ADDIS ABABA(Hawassa University, 2019-10-17) ZERIHUN ALEMAYEHU TEKAEthiopia has embarked on a long term development strategy which aimed at achieving sustainable development with all pre-requisites for a middle income country by the year 2025. The poor and deteriorated state of the construction industry with poor performance has detrimental effects to the developments of the industry. Thus, makes construction industry end product encountered many problems in terms of quality, delivery time and cost. Therefore the aims of this study also evaluation on micro and small enterprises that were engaged in 20/80 condominium housing construction at Addis Ababa in terms of quality, delivery time and cost. To achieve the proposed objectives, data were collected through the case study; questionnaire survey and site observation then making detailed discussion and analysis of problems and constraints that were hampering the performance of them. The finding of this research indicates MSEs on the average 67.6% MSEs couldn‟t delivered their activities on the required time, 75.7% MSEs couldn‟t deliver quality product output and 54.05% housing construction project office saves its cost by participating MSEs than that of contractors. On the other hand, on average according to the respondent 78.37% critical challenges were that hamper the performances of MSEs in 20/80 condominium housing construction projects at Addis Ababa. Factors causing delay in delivery of activities for MSEs are: delay in delivery of materials, contractor improper planning and skill shortage whereas factors which affect their quality include poor project management, low quality of materials and lack of experience. On the other hand major factors that cause cost overrun for MSEs in rendering activities are delay in material supply, poor project management and lack of skill. This study contributes to the advance knowledge in the area of enhancing and improving the performance of micro and small enterprises on 20/80 condominium housing construction. And also, its output will be used as a primary input for the government body during amendment and introducing of the new policies on the issues like, challenges that hampers the performance of MSEs and the solutions to overcome those problemsItem INVESTIGATION ON THE PRODUCTION PROCESS AND QUALITY OF AGGREGATES AND HOLLOW CONCRETE BLOCK: A CASE STUDY OF GEDEO ZONE(Hawassa University, 2019-12-16) TINSAE MENGISTU YIMERIn order to produce Aggregates and hollow concrete blocks with good quality which satisfy strength and durability requirements, great care have to be taken for their production starting from ingredient selection to finished product. In addition to this, every production process should follow proper scientific procedures. Considering this, investigation focusing on production process and quality of Aggregates and HCB has been conducted in various Aggregate and HCB production sites located in Gedeo Zone. The research is carried out by observing the production process, collecting information on method of production through interviews and performing different tests in the laboratory to evaluate the quality of the products. Based on the findings, conclusions are drawn and recommendations are forwarded. The findings of the investigation have shown that in most of Aggregate production site process of production is not modern and scientific. From the investigated crushing sites the Wenago and Golla crushing sites follows the best production process and also the quality of aggregates produced also better than the Waleme and the Mechisho crushing sites, especially the grading requirement was not satisfactory and the aggregates are coarser in Waleme and Mechisho Aggreagtes. All fine aggregate sources investigated in this research were natural sand excavated from river bed and the Gidabo and the Gollelicha sands were unsatisfied in grading requirement, Kilkile sand was better grading and also it passes the organic impurity test and the other two did not. Based on their quality C-30 concrete mix was prepared and the compressive strength test was performed. The mix prepared using Wenago aggregate and Kilkile sand achieved 34.85MPa 28th days compressive strength and the other mix prepared using the Waleme aggregate and Gollelicha sand achieved 28.40MPa. In HCB production sites laboratory tests were not conducted for all ingredients used for production of hollow concrete blocks and they use nominal mixing proportion, no mix design is drown based on materials property. The main products in all production sites is class C and it does not fulfill the standard provided in its compressive strength and block density. In addition to this, handling of those ingredients was very poor, and production process also not conducted properly as specified in the recommended standards.Item EFFECT OF DESIGN BID BUILD PROJECT DELIVERY METHOD ON PERFORMANCE OF BUILDING PROJECTS IN SOUTHERN ETHIOPIA(Hawassa University, 2019-10-17) REDIET EMIRU MULATUConstruction projects in Ethiopia are usually completed within a period longer than what is agreed upon by the contracting parties and with greater cost differences from contract amount. A project is regarded as successful, if the project is delivered at the right time, at the appropriate price; quality standards and providing the client with a high level of satisfaction. These problems are related with project delivery methods employed by the organizations. Construction industries employ different project delivery methods. Design bid build (DBB) method is one of them and it is widely employed in different countries. This method involves three role players in the project delivery process, the owner, the consultant and the contractor traditionally which involves competitively bid and lump sum construction contracts. The issue is common in developing countries like Ethiopia, where the magnitude of variation between originally contracted amount, time and quality are different with actually executed. By using descriptive survey study design data was obtained from clients, consultants and contractors by using open and close ended self reported questionnaires and interviews. Descriptive statistics was reported as Mean ± SD, frequency and percentages. Also to compare performance of the projects with budget used to date independent sample t-test was employed. The performance of DBB projects with regard to timely on cost and quality completion is analyzed in this study. Thus, the mean percentage of the projects‘ current progress (54.41±17.36) compared to mean percentage of costs incurred to date from planned budget (68.41±13.60) indicated a significant difference (p<0.000) higher cost incurred with lowest progress. The challenges and role of client, consultant and contractor on timely, quality and on cost completion of projects are discussed. From the study, it was found that DBB projects is poor in cost and time but it is better in maintaining quality whereas DB projects perform much better than in cost and time. The contribution of this study is giving awareness about effect of delivery method on performances of building project and to identify and evaluate favorable condition to apply DBB delivery method