A Practical Equation for Elastic Modulus of Concrete
Many empirical equations for predicting the modulus of elasticity as a function of compressive strength can be found in the current literature.
They are obtained from experiments performed on a restricted number of concrete specimens subjected to uniaxial compression. Thus, the existing equations cannot cover the entire experimental data. This is due to the fact that mechanical properties of concrete are highly dependent on the types and proportions of binders and aggregates. To introduce a new reliable formula, more than 3000 data sets, obtained by many investigators using various materials, have been collected and analyzed statistically. The compressive strengths of the considered concretes range from 40 to 160 MPa (5.8 to 23.2 ksi). As a result, a practical and universal equation, which also takes into consideration the types of coarse aggregates and mineral admixtures, is proposed.
Keywords: analysis; coarse aggregates; compressive strength; highstrength concrete; modulus of elasticity; normal-strength concrete; watercement ratio.