Title: Actual Elastic Modulus of Concrete
Author(s): Sami A. Klink
Publication: Journal Proceedings
Appears on pages(s): 630-633
Keywords: compressive strength; concretes; density (mass/volume); modulus of elasticity; prestress loss; strains; stresses; tests.
Tests were carried out on specimens of several types of normal weight and lightweight concrete to determine for each type the elastic modulus in compression at the centers of the corresponding specimens. Internal strains were measured by means of embeddable strain gage units especially constructed for this investigation. The test results showed that this elastic modulus, referred to as "actual" in this paper, is about 50 percent higher than that obtained either by the standard method of test or the recognized empirical formula. The results also showed the existence of a definite relation between the actual elastic modulus, density, and compressive strength of concrete. An empirical formula was derived for the actual elastic modulus of concrete, which is recommended for computing prestress losses, deflections, and other displacements of concrete structures.