AN APPORXIMATE METHOD TO IMPRORVEEMENT THE COMPRESSIVE STRENGTH OF CONCRETE CONTAINING HIGH PERCENTAGE OF SULPHATE

	AN APPORXIMATE METHOD TO IMPRORVEEMENT THE COMPRESSIVE STRENGTH OF CONCRETE CONTAINING HIGH PERCENTAGE OF SULPHATE
AL-TAQANI
Article 1, Volume 21, Issue 4, 2008, Pages 0-0
Abstract
The main object of the present work is to study the effect of internal sulphate( ) which is present in the concrete raw materials .Natural calcium sulphate hydrate (Gypsum( )) was used as a source of internal sulphate ( ). In order to study the effect of various percentages of culcium sulphate ( ) on the properties of the hard concrete , specimens were prepared for compressive strength test , in the formed of (100mm) concrete cubes with selective mix proportionas of 1:2:4(1 cement : 2Sand : 4 gravel) by weight and water/cement ratio of 0.5 Also high percentage of calcium sulphate was added to the concrete mixes.Results have shown that the compressive strength of concrete at 28 days after curing , decreases by 50.9% , 65.5% , 66.73% when added calcium sulphateis in 3% , 5% , 7% by weight of sand to concrete mixes , respectively . Also results have shown that when increasing the percentage of cement content by 3% , 9% , 11% in concrete mixes ,which contain calcium sulphates in 3% , 5% , 7% by weight of sand ,the compressive strength of concrete at 28 and 60 days does not decrease and has the same compressive strength of concrete without sulphates

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