United States Department of Transportation
i
Evaluation of the fatigue and toughness of fiber reinforced concrete for use as a new highway pavement design.
-
2016-04-01
-
[PDF-1.23 MB]
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Corporate Publisher:
-
Abstract:Concrete pavement design is currently centered on steel reinforcement, whether that reinforcement be in the
form of dowel bars, as is the case in jointed plain concrete pavement (JPCP), or in the form of continuous rebar
reinforcement, continuously reinforced concrete pavement (CRCP). The use of steel in concrete pavements
presents durability problems due to the corrodibility of steel. This study evaluates the use of polypropylene
fibrillated, polypropylene macro, carbon, and steel fibers as primary reinforcement in concrete pavements.
Results showed that fiber reinforcement can be used to improve both the fatigue and toughness performance of
concrete. When post-cracked strength or toughness is the concern, concrete containing more fibers and fibers
with higher tensile strength are desirable. Carbon fibers maintained greater load-carrying capacity at lower
deflections than the steel fibers, which produced the greatest ductility. However, toughness and fatigue
performance did not correlate for small deflections, suggesting that polypropylene macro fibers may be adequate
for repeated, low stress loading.
This study also found that when repeated low deflections are a concern, such as many pavements, there must be
sufficient fibers across a crack to maintain a tight crack. Conversely, too many fibers prevent adequate
consolidation and aggregate interlock, which negatively influences performance. When considering the precracked
fatigue performance of fiber reinforcement, the fibers needed to have sufficient length to reach across
the crack and bond with the concrete, and that higher fiber dosages increase the fatigue performance of the
concrete. The resulting pavement design, continuously fiber reinforced concrete pavement (CFRCP), will
provide an alternative to JPCP and CRCP in highway pavement design that is not susceptible to durability
problems associated with corrosion of the reinforcement.
-
Format:
-
Alternate URL:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
