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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1411

Authors: Shewaferaw, Dinku
Advisors: Dr. –Ing. Abebe Dinku
Keywords: aggregate,
compressive strength
manufactured sand
Copyright: 2006
Date Added: 13-Oct-2008
Publisher: Addis Ababa University
Abstract: ABSTRACT Manufactured sand is a term used for aggregate materials less than 4.75mm and which are processed from crushed rock or gravel. Due to booming of construction activities in our country, natural sand resources are increasingly depleted and its cost is becoming increasingly high. This research was, therefore, conducted to study the influence that manufactured sand have in compressive strength of concrete, to compare the cost of different mix compositions and to assess the prospects of using manufactured sand as replacement of natural sand in Ethiopia. Initially, different natural and manufactured sand samples to be used in the concrete mixes were collected and their physical properties were studied. Fifteen different concrete mixes having five mix proportions for both natural and manufactured sand (i.e. 100%NS+ 0%MS; 75%NS+25%MS; 50%NS+50%MS; 25%NS+75%MS and 0%Ns+100%MS) were prepared for normal strength, intermediate strength and high strength concrete using a water cement ratio and cement contents of 0.54, 370kg/m3; 0.39, 460kg/m3; 0.30, 520kg/m3 respectively. The properties of these mixes have then been assessed both at the fresh and hardened state. In addition, comparison of costs for each concrete mixes based on the price of the concrete material collected from Addis Ababa, Nazareth, Awassa, Mekelle and Jimma towns were made. The results of the hardened properties of the mixes have shown that concrete mixes with partial proportions of manufactured and natural sand achieved a higher compressive strength at all test ages. The cost comparisons results also have shown that using manufactured sand in partial or full replacement to natural sand doesn’t cause any significant cost variation. It has been found also that use of manufactured sand is more suitable for high strength concrete production. It can therefore, be concluded from the findings of this research that when the availability of natural sand is scarce or in cities where the price of natural sand is as expensive as manufactured one, manufactured sand concrete mix is a viable and better alternative to the use of natural sand.
Description: A thesis submitted to the School of Graduate Studies of the Addis Ababa University in partial fulfillment of the requirements for the degree of Master of Science in Civil Engineering
URI: http://hdl.handle.net/123456789/1411
Appears in:Thesis - Civil Engineering

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