Nanomechanical Structure-property Relations
Of Dynamically Loaded Reactive Powder Concrete
Author(s)
P. G. Allison, R. D. Moser, M. Q. Chandler, T. S. Rushing,
B. A. Williams & T. K. Cummins
Abstract
Low water-to-cement ratio (w/c) reactive powder concretes (RPCs) exhibit much
higher compressive strengths compared to conventional concrete through
optimized particle packing and specialized curing regimes. The high strain-rate
impact behavior of RPCs was investigated at the macroscale. However, little
work has been done to study the fundamental material behaviors and failure
mechanisms of RPC under high strain impact and penetration loads at lower
length scales. These high strain-rate loadings have many possible effects on
RPCs at the microscale and nanoscale, including alterations in the composition
and bonding present in hydrated phases such as calcium silicate hydrate (C-S-H),
in addition to fracture and debonding. In this work, the possible chemical and
physical changes of RPCs under high strain-rate impact and penetration loads
were investigated using a novel technique wherein nanoindentation
measurements were spatially correlated with chemical composition using
electron microscopy. Results indicate that high strain-rate impacts degrade both
the elastic modulus and indentation hardness of RPCs and, in particular C-S-H,
with damage likely occurring due to microfracturing and debonding. Additional
studies will be required to better understand degradation phenomena within
C-S-H itself.
Keywords: nanoindentation, SEM, EDX, RPC, UHPC, C-S-H.
1 Introduction
Concretes and Portland cement-based materials are the most-produced manmade
materials on earth, with over twenty billion tons produced per year. The
Keywords
nanoindentation, SEM, EDX, RPC, UHPC, C-S-H
Related Book
Other papers in this volume
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