Micromechanical Evaluation of the Damping Behavior of Modified Silica Fume Admixed Concrete

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 imp...

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Bibliographic Details
Published in:Journal of engineering mechanics 2012-12, Vol.138 (12), p.1411-1419
Main Authors: Pan, Tongyan, Xia, Kaiming
Format: Article
Language:English
Subjects:
Applied sciences
Buckling
Building structure
Buildings. Public works
Concrete industry
Concrete structure
Concretes
Construction (buildings and works)
Damping
Damping capacity
Discrete element method
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Impact loads
Physics
Silica fume
Solid mechanics
Static elasticity (thermoelasticity...)
Stiffness
Structural and continuum mechanics
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
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Summary: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.
ISSN:0733-9399
1943-7889
DOI:10.1061/(ASCE)EM.1943-7889.0000446