Browsing by Author "Aregaw, Mengistu"
Now showing 1 - 1 of 1
Results Per Page
Sort Options
Item Investigation of Calcite and Volcanic Ash for their Utilizations as Cement Filling and Additive Materials(Addis Ababa Universty, 2010-06) Aregaw, Mengistu; Redi, Mesfin (PhD)The purpose of this study is to use calcite and volcanic soil as cement filling and additive materials in order to maximize cement productions in Ethiopia. In this study the characteristics of calcite and volcanic soil, suitable mix design of OPC raw materials, sources of calcite, chemical properties of calcite, volcanic soil, basic cement raw materials and clinker, and the effect of calcite and volcanic soil on mechanical performance of concrete were investigated. The additions of calcite up to 15% by weight improves early strength and additions above 15% results little decreasing early strength but develop high lateral strength. Use of volcanic soil from 28% to 35% by weight results a decrease of early strength and develops lateral strength. The additions of these materials did not affect quality of cement and mechanical performance of concrete. The investigation shows that up to 15% Calcite filled cements have superior properties to the current Portland cement and Portland Pozzolanic Cements such as high early strength, excellent volume stability, minimum cost of productions and easy manufacture process.