United States Department of Transportation
i
Use of fiber reinforced concrete for concrete pavement slab replacement.
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2014-03-01
[PDF-2.33 MB]
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Abstract:Unlike ordinary concrete pavement, replacement concrete slabs need to be open to traffic within 24 hours (sooner in
some cases). Thus, high early-strength concrete is used; however, it frequently cracks prematurely as a result of high
heat of hydration that leads the slab to develop plastic shrinkage. FRC is known to provide good resistance to plastic
shrinkage and has a proven record in the building industry particularly with slab-on-grade application. However, the
current specification does not address the use of FRC in civil infrastructure. The only specification under
development for FRC usage is for bridge deck application which does not address the use of FRC in controlling
plastic shrinkage. This research project explored the potential use of fiber reinforced concrete (FRC) in concrete
pavement slab replacement particularly in controlling plastic shrinkage. Five different fiber types, including steel,
glass, basalt, nylon, and polyethylene fibers were investigated. Additionally, the effect of fiber length was also
investigated for the polyethylene fiber. The fibers were added at low-dosage amounts of 0.1% and 0.3% by volume.
Retrained shrinkage tests were conducted to assess the cracking potential of the concrete mixtures and the ability for
each fiber type to resist cracking. Results indicated that both polyethylene and nylon fibers provided the best
resistance to early-age shrinkage. However, balling was a problem for nylon fiber reinforced concrete. Short fibers
(< 1-in.) also had the best performance in resisting early-age shrinkage, while long fibers (> 1-in.) provided
additional post-cracking capacity. For replacement slab, it is recommended that a short polyethylene fiber be used to
eliminate uncontrolled cracking.
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