Ahmad J Ibrahim - College of Engineering , Omar Al-Mukhtar University, Beida, Libya

The paper investigates the relationships between cement paste content and compressive strength of concrete at 28 and 90 days cured under the simulation of hot weather condition compared with normal condition using different types of cement. The results that: 1- using of sulfate resisting cement for concrete mixes, cured in simulated hot weather will tend to higher compressive strength compared with the similar specimens cured at normal circumstances of lean concrete or when the cement paste equal or near the cement paste demand of aggregate 2. using of sulfate resisting cement for concrete mixes, cured in simulated hot weather is preferable and will tend to reduction in compressive strength less than of ordinary Portland cement. 3. the reduction in compressive strength due to effect of simulated hot weather curing began after 9 hr later was less then , that of curing begin immediately after mixing .

cement paste demand, cement paste content, compressive strength, simulated hot weather