Fig. 3 SPLITTING TENSILE STRENGTH FOR DIFFERENT DOLOMITE AND GRAVEL CONCRETE MIXES. Fig. 4: BOND STRENGTH FOR DIFFERENT DOLOMITENT AND GRAVEL CONCRETE MIXES.

Figure 5 and Table 4 show the test results of this phase in this work. Superplasticizer with percentages 0% , 1% and 2% of cement weight has been added to dolomite concrete mixes to study its effect on the compressive strength at different ages 3, 7 and 28 days. At the same time five curing methods have been adopted to study the effect of them on the compressive strength of dolomite concrete with Superplasticizer. It can be noticed that at the age of 3 days, the compressive strength of specimens cured in hot water (55°C) has the higher values 39.3, 46.6 and 57.5 N/mm2 with the mixes having 0% , 1% and 2% Superplasticizer. At 28 days age, the compressive strength of specimens cured in cabinet (55°C and R.H 50%) give the higher values 53.6, 75 and 75.1 N/mm2 for mixes having 0% , 1 % and 2% Superplasticizer. For comparison we consider the dolomite concrete mix without Superplasticizer as a control mix to study the effect of the different curing methods adopted in this work. It has been found that higher results abtained with the curing by cabinet (55°C+R.H. 50%), then curing by hot water (55°C), then curing by submengh in water (17°C) and at last the specimens left in air (18-20°C).