oa Civil Engineer in South Africa - Elasticity of plain concrete and mortar specimens in flexure and compression

Volume 25, Issue 4
  • ISSN : 0009-7845



The elasticity of concrete and mortar is assessed by means of cylinder and prism compression teats, and beam bending tests. A comparison between the elastic moduli measured in the different tests shows that higher moduli are measured in the smaller beams and prisms than in the larger cylinders. A statistical 'weakest link' theory may qualitatively assist in explaining the results, and it is proposed that specimen size effects are important in stiffness measurements. Beams show better stress-strain linearity under load than do cylinders. A relationship is derived for the flexural tensile stresses and strains in a plain beam, and shown to be similar to previous relationships for compression. It appears that transverse strain gradients exercise a greater crack-modifying effect on concrete in tension than in compression.

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