An Investigation Into the Uniaxial Behavior
of Ultra High Performance Fiber
Nicholas Adomat, Hyunoh Shin, Prof. Denis Mitchell
Reinforced Concrete Columns
Department of Civil Engineering and Applied Mechanics, McGill University
Methodology
The aim of this research is to determine the
uniaxial behavior of ultra high performance fiber
reinforced concrete (UHPC) columns with
compressive strengths of 180, 150, and 120 MPa
and varying amounts of transverse reinforcement
All columns were constructed with concrete
containing 2% microfibers by volume. As a result,
the combined effect of the transverse
reinforcement and steel microfibers on the postpeak behavior of the UHPC columns can be seen
NSC
HSC
Eleven rectangular and five circular UHPC columns
were built with unique specifications at Korea
University and were then transported to McGill
University for testing. Six of the rectangular
columns are presented here
Specifications of Test Specimens
No.
fc' (MPa)
SC1
SC2
SC3
SC9
SC10
SC11
180
180
180
120
120
120
Transverse Reinforcement
Type
Dia. (mm) s (mm)
A
10
40
C
10
54
C
10
40
A
10
60
C
10
80
C
10
60
Reinforcement
Ratio
3.60%
4.50%
6.10%
2.40%
3.00%
4.00%
10000
MTS Load (kN)
This research project is a joint effort between
McGill University and Korea University
Experimental Results
SC-1
SC-2
SC-3
8000
6000
4000
2000
0
0
5
10
Rd
1.5-2.5
2.5
4
1.5-2.5
2.5
4
SC-9
20
25
30
SC-10
25
30
SC-11
8000
6000
4000
2000
0
0
UHSC
15
MTS Stroke
10000
MTS Load (kN)
Introduction
5
10
15
MTS Stroke
20
Summary and Conclusions
As compressive strength increases, the
failure mode becomes more brittle
Experimental Setup
The columns were subjected to uniaxial compression until failure
How will
the UHPC
columns
respond?
UHPC columns have the ability to maintain
strength after the peak load has been reached.
The combined effect of transverse reinforcement
and steel microfibers leads to a more ductile failure
mode. Some of the columns maintained strength
more efficiently than others; it is clear that the
amount and arrangement of the transverse
reinforcement within the UHPC columns is an
important factor in achieving higher ductility