Comparison Of Concrete Properties Produced Using Mugher Messebo And Diredawa Cements.

Properties of concrete and its constituent materials are theoretically explained. The three cementrnfactories across the country were visited and test results of Mugher OPC and PPC, Messebo OPCrnand PPC and Diredawa PPC were collected from their respective factories. Then the chemicalrnand physical properties of these cements were analyzed. Furthermore, three mix proportions forrnNormal, Intermediate and High Strength Concretes were conducted in laboratory. At each mixrnproportion there are five mixes which were made keeping every condition the same but varyingrnthe cement types.rnTo see the effect of curing on strength development among concretes made of the five cementrntypes, different curing conditions were applied.rnThe analyzed cement test results together with literature survey on effect of cement in concreternproperties are used to propose and compare concrete strength and other properties among thernconcretes made of the five cements. The laboratory conducted compressive strength test resultsrnare also used to compare the rate of strength development, the difference in compressive strengthrnvalues with age and to see the effect of curing on compressive strength development.rnIn each class of concrete, concreting was made keeping every condition the same except varyingrnthe cement type; hence, the variation on the concrete properties is mainly attributable to therncement’s properties.rnAs shown on the analysis part, the expected concrete strength proposed using the cement testrnresults analysis has turned out to be similar with the laboratory compressive strength test results.rnIn fact, this has created strong confidence with regard to the other concrete properties proposedrnusing the cement test results analysis.rnObservation on the test results of this research indicates that for the mix proportions and curingrnconditions made in this study, at all ages and classes of concrete, Messebo OPC has produced thernhighest compressive strength concrete, followed by Mugher OPC, Messebo PPC, Mugher PPCrnand Diredawa PPC in descending order. Besides, though the compressive strength differencesrnbetween the concretes made of the PPCs and OPCs show a decreasing trend with age, the gap inrnVrnstrength at the age of 91 days between them is too large to be narrowed and matched with time.rnTherefore, the PPCs can not produce a concrete strength as high as that of the OPCs.rnThe low pozzolanicity of the volcanic pozzolanas used in production of the three PPCs as well asrnshortage of extended moist curing are the reasons believed to make the ultimate strength ofrnconcretes made of the PPCs to be lower than that of the OPCs’ at the age of three months.

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