| Summary: | This paper presents test results from an experimental study to investigate the modulus of elasticity of high strength concrete using locally available materials in Riyadh (the capital city of Saudi Arabia). The compressive strength ranged from 45 to 90 MPa. Comparisons with the ACI 318 and the ACI 363 empirical equations for the prediction of the modulus of elasticity were performed. It was found that the ACI 363 equation underestimates the modulus of elasticity, while the ACI 318 equation overestimates the modulus for strengths greater than 80 MPa. Two empirical relations for predicting the modulus of elasticity for compressive strengths obtained from 150 x 300 mm and 100 x 200 mm cylinders using local materials were proposed. Keywords: High strength concrete, Modulus of elasticity, Compressive strength
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