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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1470

Copyright: 2007
Date Added: 17-Oct-2008
Publisher: Addis Ababa University
Abstract: ABSTRACT This research is intended to provide detailed technical and economic information on the production of compressed cement stabilised earth blocks. These include information on suitable soil types, local stabilisers, stabilisation techniques, production of compressed stabilised earth blocks and their economical value and potential. Critical review of related literatures show that soil types, proportions between soil and stabiliser and compaction pressure applied to the moist soil mix affects the quality of the compressed earth block. Since soil in the Kara area of Addis Ababa is mainly used to compressed stabilised earth block production, this area was the prime target for the investigation and testing. Laboratory tests conducted on Kara area soil provided more precise and detailed information on the soils grading, plasticity, chemical composition and the result proved the soil’s suitability for block production. Using two types of cements manufactured in Ethiopia as stabiliser and soil sample from Kara area of Addis Ababa, three different series of tests were prepared based on literature recommendations. Tests were conducted on soil blocks performance like compressive strength and water absorption on which the durability of the blocks depend. The effects of compaction pressure on the quality of the soil blocks, the optimum cement content for stabilisation and cost comparison with hollow concrete blocks are prepared. The performance characteristics of local stabilisers are evaluated and comparisons are made. The investigation has revealed that from the blocks produced at the varying cement contents from 4% in increments of 2% up to 12% at constant compressive pressure of 10MPa, all the blocks except blocks produced by 4% cement have 56th day wet compressive strength values well above most of the recommended minimum values for use in structural work. Thus 6% cement is taken as optimum cement content for stabilisation of Kara area soil for block production. Further increasing cement content results in an increase in the compressive strength value and a decrease in the absorption capacity of the soil block. Increment of the compaction pressure also improves the compressive strength of soil cement block. Comparisons of the effects of local cement stabilisers, Mugher PPC and x Messobo PPC showed that Mugher PPC has shown better stabilisation effect based on the 56th day compressive strength of blocks. The cost comparison with the conventional walling making material, hollow concrete blocks, has revealed that compressed cement stabilised soil block is preferred because it is more economical walling material in itself and permits the use of economical building techniques.
Description: A thesis submitted to The Schools of Graduate Studies of Addis Ababa University in partial fulfillment of the requirements for the Degree of Master of Science in Construction Technology and Management
URI: http://hdl.handle.net/123456789/1470
Appears in:Thesis - Civil Engineering

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