Concrete Toughness after 20 Years
Publication: Journal of Structural Engineering
Volume 119, Issue 5
Abstract
Test results are presented showing stress‐strain diagrams of aged and young plain concrete columns , under cycles of axial deformation of increasing amplitude. The aged columns had been stored for 20 years under controlled conditions and the young columns aged one month. Both series were made employing similar kinds of cement, coarse aggregate, mix proportioning, consistency, and setting conditions. The results show that the aged columns have lower toughness. Different indexes are proposed, based on the mechanical energy required to reach the collapse. The peak resistance of aged columns is some 30% higher than that of the young columns. This partly reduces the differences in energies. Significant differences are shown in terms of ratio between the energies required to reach collapse and the peak resistance. This ratio is shown to carry the same information as the quantity ductility, currently used in earthquake engineering, with reference to an elastic‐perfectly plastic material. Measurements of Poisson ratio on aged columns do not show significant differences with values reported for young concrete.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 119 • Issue 5 • May 1993
Pages: 1402 - 1412
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Nov 15, 1991
Published online: May 1, 1993
Published in print: May 1993
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