Shape and Size Effects on the Compressive Strength of High-strength Concrete

In this paper the authors investigate the influence of the shape and size of specimens on the compressive strength of high-strength concrete. Cylinders and cubes of different sizes are used for performing stable stress–strain tests. The tests were performed at a single axial strain rate, 10− 6 s− 1. This value was kept constant throughout the experimental program. Results show that the post-peak behavior of the cubes is milder than that of the cylinders, which results in a strong energy consumption after the peak. This is consistent with the observation of the crack pattern: the extent of cracking throughout the specimen is denser in the cubes than in the cylinders. Indeed, a main inclined fracture surface is nucleated in cylinders, whereas in cubes it is found that lateral sides get spalled leading to the so-called hour-glass failure mode. The remaining cube core gets fragmented due to crushing, in some cases exhibiting a dense columnar cracking in the bulk of the specimen. Lastly, the relationship between the compressive strength given by both types of specimen for several specimen sizes is also investigated.

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  • English

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  • Accession Number: 01095859
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 28 2008 4:20PM