Retracted: Micromechanical Evaluation of the Damping Behavior of Modified Silica Fume Admixed Concrete
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Volume 138, Issue 12
Abstract
Vibration reduction or damping capability is highly desired for structural stability when hazardous impact loads are applied to a concrete structure. Damping capability of concrete structures depends primarily on the viscoelastic response of concrete material to the magnitudes and frequencies of impact loads, which in turn requires a minimum level of stiffness and damping capacity of concrete. A common industrial byproduct material—silica fume that showed certain antishock potential when mixed with concretes—was modified with silane in this study toward improved capabilities in both stiffness and damping. To evaluate the effectiveness of the modified silica fume (MSF), a series of dynamic flexural tests and numerical analyses were conducted, of which the results are presented. A three-dimensional micromechanical model was developed based on the discrete element method (DEM), which was then employed to study the stiffness and damping behavior of the admixed concrete. A 10% usage of MSF (by weight of cement) was found to significantly enhance the storage and loss moduli and the loss tangent of concrete. The DEM model developed can be used for evaluating and designing energy-absorbing concretes for general military and civil uses.
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Published In
Journal of Engineering Mechanics
Volume 138 • Issue 12 • December 2012
Pages: 1411 - 1419
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Jan 26, 2011
Accepted: Mar 29, 2012
Published online: Mar 31, 2012
Published in print: Dec 1, 2012
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