THE EFFECT OF GYPSUM COMPENSATIVE ON MORTAR COMPRESSIVE STRENGTH

The gypsum concrete is a new type of concrete and has its usage. This study aimed to know the effect of the gypsum on the compressive strength using 2 inch. or 50 mm cube specimen. They compensated 5%, 15% and 25% of the cement by the gypsum respectively for making six specimens for each treatment of the gypsum had been studied. Comparing their compressive strength at age (3) days and at age (7) days with a control mortar mix at the same ages. The results shown that the compressive strength for cement mortar is decrease whenever the compensated 5%, 15% and 25% of the cement by the gypsum 38.8%, 60.5% and 68.5% respectively for (3) days age specimens. The compressive strength for cement mortar is decrease whenever the compensated 5%, 15% and 25% of the cement by the gypsum 38.1%, 58.4% and 66.1% respectively for (7) days age specimens. Through that we determined the limitation of gypsum concrete in building works.