Title: Compressive Strength of Concrete In Flexure As Determined From Tests Of Reinforced Beams
Author(s): Willis A. Slater and Inge Lyse
Publication: Journal Proceedings
Appears on pages(s): 831-874
An investigation was made to determine the relation between the compressive strength of 6 x l2-in. control cylinders and the strength of the same concrete com- puted from beam tests in which the concrete failed in compression. Compressive strengths of the concrete ranged from 1400 to 5800 psi. The constant water content theory of proportioning concrete mixes was applied for the first time. The beam-cylinder strength ratio varied with the stren of the concrete. Using the straight line formula f t h or computing stresses in the beams, the ratio varied from more than 2.0 to 1.4 while using the parabolic stress distribution it varied from I .5 to 0.95 for concrete having a range in strength from 1400 to 5800 psi. The observed stresses in the steel agreed fai rl w e l l w i t h the stresses computed by the straight line formula.