Comparative study on RCC and post tensioning slab considering cost and time Effect in case of Addis Ababa

Abstract

At the present in construction industry the post tensioning method used widely due to its advantages compare to previous time. In developing countries like Ethiopia the benefit of post tensioning slab are yet to be recognized. By using post tensioning method we can achieve the most economical and safe design for residential as well as commercial buildings. This paper deals with the study of comparison of reinforced and post tension slab with respect to cost estimate and project time consumption. The cost was analyzed by using unit rate analysis. For this application of cost estimation a commercial building is consider as a case study. The plan of the commercial building (G+6) and above is considered. The results indicate that PT slab has cost better than that of RC slab system. The main tools for the collection of data included questionnaires, interviews and site visit were used to identify the various efforts that have been made in the past to evaluate and examine the cost and time impact of post tensioning on selected building projects. Simple statistical analysis involving tables and percentages were used in analyze the results from the questionnaire. Secondary sources of data were obtained from relevant literature that covered research, publication on the subject matter. The results from analysis ranked from the first to third position by contractors, consultants and owners that the most significant factors causing post tensioning construction on building construction projects are:-cost factors, time factors and Operations factors respectively. The results of this study recommend to the government there is a need to establish post tensioning department, establish laws and policies that toward managing and application of post tensioning construction at all levels in a construction projects, The study recommended the clients who involved in the construction industries to take the post tensioning history of the post tensioning contractors and as a criterion in awarding contracts and Taking training on new technology which is afford the construction cost and good applicable on our country to participate and invest on it. The study recommended the consultants to give attention to new technology that is affordable and applicable.