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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/3508

Title: Bagasse ash as a cement replacing material
Authors: HAILU, BIRUK
Advisors: PROF. DR. - ING. ABEBE DINKU
Keywords: Sugarcane bagasse ash
cement replacing material
Copyright: Dec-2011
Date Added: 28-Jul-2012
Abstract: Sugarcane bagasse ash is a byproduct of the sugar factories found after burning sugarcane bagasse which itself is found after the extraction of all economical sugar from sugarcane. The disposal of this material is already causing environmental problems around the sugar factories. Due to the boost of the construction activity in the country, a huge shortage is created in most of the construction materials especially cement, resulting in steady increase of price. This research was therefore, conducted to examine the potential of bagasse ash as a cement replacing material. Initially, bagasse ash samples were collected from Wonji sugar factory and its chemical properties were investigated. The bagasse ash were then ground until the particles passing the 63 μm reaches about 85%, which is similar to that of ordinary Portland cement. Ordinary Portland cement and Portland pozzolana cement were replaced by ground bagasse ash. Normal consistency and setting time of the pastes containing ordinary Portland cement and bagasse ash from 5% to 30% replacement were investigated. The compressive strength of mortars containing ordinary Portland cement and Portland pozzolana cement with bagasse ash from 5% to 30% replacements were also investigated. Four different concrete mixes with the bagasse ash replacing 0%, 5%, 15% and 25% of the ordinary Portland cement were prepared for 35MPa concrete with water to cement ratio of 0.55 and 350kg/m3cement content. The properties of these mixes have then been assessed both at the fresh and hardened state. The results of the mortar work have shown that, up to 10% replacement of the ordinary Portland cement by bagasse ash achieved a higher compressive strength at all test ages i.e. 3, 7 and 28 days, whereas the 15% replacement of the cement by bagasse ash in the concrete have shown a slightly lower compressive strength at 56 days. The water penetration depth was found to increase as the bagasse ash content increases and all the blended concretes showed a higher maximum penetration depth than the control concrete. It can therefore be concluded that 10% replacement of cement by bagasse ash results in a similar concrete properties and higher replacement could also be used with a slight reduction in the performance of the concrete.
URI: http://hdl.handle.net/123456789/3508
Appears in:Thesis - Civil Engineering

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