packing - Particle Packing Models and Their Use in the...

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1 Particle Packing Models and Their Use in the Design of Ultra High Performance Concretes C. Kennan Crane Ph.D. Candidate 2 Overview z Definition and Motivation z History of Particle Packing in Concrete Research z Packing Models z Current Usages in Concrete Design z Use of Particle Packing in UHPC Design z Experimental Comparisons z Conclusion
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2 3 Theory Behind Particle Packing (after Stovall, 1986) 4 Motivation for Particle Packing in UHPC z Decrease permeability by decreasing pore size (Roy, 1995) z Further reduce W/C z Densify pre-hydrated mixture (Fu, 2003) z Densify hydration product (Bonneau, 2000) Does it work?
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3 5 History of Particle Packing z First used in concrete research in 1892 by R. Feret to optimize aggregate gradation (Wang, 1997) z Initial objective was to achieve most dense packing possible in order to reduce cement usage (Mehta, 2006) 6 Governing Assumption of All Packing Models MATH = FUN (Crane, 2007)
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4 7 Traditional Model Types Particle Packing Discrete models: -use idealized sets of specifically sized particles in creating packing models Continuous models: -use continuous gradations of particle sizes (Kumar, 2003) 8 Discrete Models Binary Ternary Multimodal Furnas Powers Aim and Goff Toufar, Klose, and Born de Larrard (Kumar, 2003)
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5 9 Continuous Models
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This note was uploaded on 08/23/2011 for the course CEE 8813b taught by Professor Kurts during the Spring '07 term at Georgia Institute of Technology.

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packing - Particle Packing Models and Their Use in the...

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