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<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-family: 'Times New Roman'; ">Ph.D. Dissertation Defense<o:p></o:p></span></b></p>
<p class="MsoNormal" align="center" style="margin-top:6.0pt;text-align:center"><b><span style="font-family: 'Times New Roman'; ">Prakash
Bhat<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family: 'Times New Roman'; "> </span></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-family: 'Times New Roman'; ">Cementitious Materials with
Ultra-High Damage Tolerance for Hazards Mitigation</span></b><b><span style="font-size: 11pt; font-family: 'Times New Roman'; "><o:p></o:p></span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size: 11pt; font-family: 'Times New Roman'; "> </span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size: 11pt; font-family: 'Times New Roman'; ">Committee
members:<o:p></o:p></span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size: 11pt; font-family: 'Times New Roman'; ">Dr. Mo Li (chair of the
committee), Dr. Yi-Lung Mo, Dr. Kaspar J. Willam, <o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size: 11pt; font-family: 'Times New Roman'; ">Dr. Gangbing Song, Dr.
Jose H. Vazquez<o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="margin-top:6.0pt;text-align:center"><b><span style="font-size: 11pt; font-family: 'Times New Roman'; ">Location:</span></b><span style="font-size: 11pt; font-family: 'Times New Roman'; "> N61 Engineering Building 1<o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="margin-top:6.0pt;text-align:center"><b><span style="font-size: 11pt; font-family: 'Times New Roman'; ">Date: </span></b><span style="font-size: 11pt; font-family: 'Times New Roman'; ">December 3, 2015 <b>Time:
</b>9:30 a.m.<b><o:p></o:p></b></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size: 11pt; font-family: 'Times New Roman'; "> </span></b></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: 'Times New Roman'; "> </span></p>
<p class="MsoNormal"><a name="_Toc436059537"></a><a name="_Toc434131341"></a><a name="_Toc429196443"><b><span style="font-size: 11pt; font-family: 'Times New Roman'; ">Abstract</span></b></a><b><span style="font-size: 11pt; font-family: 'Times New Roman'; "><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: 'Times New Roman'; "> </span></p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph"><span style="font-size: 11pt; font-family: 'Times New Roman'; ">Concrete structures,
including civil infrastructure and energy infrastructure, are facing safety
concerns under extreme loading events, such as earthquakes, elevated
temperature, and impact loading. The low fracture resistance of concrete often
results in brittle failure modes such as concrete spalling, fragmentation, loss
of bond with reinforcing steel, and catastrophic structural failure. In order
to improve the resistance of concrete structures to natural and manmade
hazards, a material-based approach is proposed, which will fundamentally
transform concrete from a brittle material to a damage-tolerant material
exhibiting pseudo strain-hardening behavior and extraordinary ductility. This
is achieved through a multi-scale method, which links micromechanics-based
material design theory spanning nano-scale to composite material-scale, to
material processing and experimental characterization, and finally to the
development of new constitutive models and finite element analysis of
structural behavior. <o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph"><span style="font-size: 11pt; font-family: 'Times New Roman'; "> </span></p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph"><span style="font-size: 11pt; font-family: 'Times New Roman'; ">In this dissertation, we
first improve and expand the theoretical framework for designing ductile strain-hardening
cementitious materials, taking into account of the random distribution of flaws
and fibers. Analytical modeling coupled with experimental measurements of
micromechanical and statistical parameters are interwoven at different scales
of this framework. Based on the theoretical framework, two categories of new fiber
reinforced cementitious composite materials are successfully designed and
processed: one is strain-hardening cementitious composites (SHC) featuring optimized
tensile ductility, minimized width of microcracks, fracture energy two orders
higher than regular concrete, and large energy dissipation capacity under
cyclic loading; the other is ultra-light-weight SHCs featuring a low density
40-60% less than regular concrete, meanwhile maintaining a large tensile
ductility more than 500 times that of normal concrete and compressive strength
higher than 40 MPa. Both categories of SHCs exhibit ultra-high damage tolerance
under static and cyclic loading, as well as elevated temperature effect. The
ultra-light-weight SHC in particular allows great potential for mitigating the
impacts of earthquakes on structures by simultaneously reducing seismic demand
on structures while increasing structural seismic resistance. It also offers
significantly improved resistance to elevated temperatures.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph"><span style="font-size: 11pt; font-family: 'Times New Roman'; "> </span></p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph"><span style="font-size: 11pt; font-family: 'Times New Roman'; ">The new SHC materials
are experimentally characterized to understand their behavior under various loading
and environmental conditions. New constitutive models are developed. These
constitutive models bridge the gap between material behavior and structural
performance, and are incorporated into a finite element analysis program to
fundamentally elucidate how material damage tolerance and lightweightness can
be translated into improved seismic performance of structures.<o:p></o:p></span></p>
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