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Title page for ETD etd-03242014-111454


Type of Document Dissertation
Author Heard, William Franklin
Author's Email Address william.f.heard@usace.army.mil
URN etd-03242014-111454
Title Development and Multi-Scale Characterization of a Self-Consolidating High-Strength Concrete for Quasi-Static and Transient Loads
Degree PhD
Department Civil Engineering
Advisory Committee
Advisor Name Title
Prodyot K. Basu Committee Chair
Caglar Oskay Committee Member
James Wittig Committee Member
Sankaran Mahadevan Committee Member
Thomas Slawson Committee Member
Keywords
  • Self Consolidating Concrete
  • High Strength Concrete
  • Projectile Impact
  • Triaxial Compression
  • Split Hopkinson Bar
  • Kolsky Bar
Date of Defense 2014-03-11
Availability unrestricted
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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