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    Development and Multi-Scale Characterization of a Self-Consolidating High-Strength Concrete for Quasi-Static and Transient Loads

    Heard, William Franklin
    : https://etd.library.vanderbilt.edu/etd-03242014-111454
    http://hdl.handle.net/1803/11215
    : 2014-03-25

    Abstract

    Systematic development of a new self-consolidating high-strength cementitious armor material, for use in protective construction against blast and ballistic impact, is presented. Multi-scale experimental methods are developed and implemented to optimize the material for quasi-static compression and flexure loading conditions, flow characteristics, interfacial bond between the matrix and high-strength steel fiber, and microstructure pore size distribution and porosity. The deviatoric and pressure-volume responses are characterized for the optimized material under quasi-static triaxial states of stress. A new pulse shaping technique is presented and utilized to satisfy stress equilibrium for constant high-strain rates on a large diameter Kolsky bar. The dynamic stress-strain responses are presented with the strength increase factors for the optimized cementitious armor. A series of ballistic experiments were undertaken to evaluate the performance of the new armor, with and without short fiber reinforcement, against fragmenting weapons and projectile impact.
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