Investigation Of Calcite And Volcanic Ash For Their Utilizations As Cement Filling And Additive Materials

The purpose of this study is to use calcite and volcanic soil as cement filling and additivernmaterials in order to maximize cement productions in Ethiopia. In this study therncharacteristics of calcite and volcanic soil, suitable mix design of OPC raw materials,rnsources of calcite, chemical properties of calcite, volcanic soil, basic cement rawrnmaterials and clinker, and the effect of calcite and volcanic soil on mechanicalrnperformance of concrete were investigated. The additions of calcite up to 15% by weightrnimproves early strength and additions above 15% results little decreasing early strengthrnbut develop high lateral strength. Use of volcanic soil from 28% to 35% by weight resultsrna decrease of early strength and develops lateral strength. The additions of these materialsrndid not affect quality of cement and mechanical performance of concrete.rnThe investigation shows that up to 15% Calcite filled cements have superior properties tornthe current Portland cement and Portland Pozzolanic Cements such as high early strength,rnexcellent volume stability, minimum cost of productions and easy manufacture process.

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