TM 5-822-7/AFM 88-6, Chap. 8
APPENDIX C
STEEL-FIBER-REINFORCED
CONCRETE
C-1. Introduction. Over the past 10 years fiber-
reinforced concrete has been used in numerous trial
pavement applications. This composite material
C-2. Description. Table C-1 shows typical
consists of a concrete matrix containing a random
characteristics of steel-fiber-reinforced concrete
dispersion of small steel fibers. It exhibits increased
pavements used at several airfields. Cement contents
tensile strength, roughness, and span resistance
are typically much higher than conventional concrete
when compared to plain or conventionally reinforced
and the aggregate volume is lower. Maximum
concrete. Even after an initial tight crack forms,
nominal size aggregate for these mixtures has varied
fibers bridge across the crack providing additional
from 3/8 to 3/4 inch. Fly ash is often used as a partial
load-carrying capacity until the steel fibers fail or
substitute for Portland cement to improve workability
the bond between the fiber and cement paste fails.
and lower the-heat of hydration. Steel fiber contents
3
have ranged from 80 to 220 lb/yd . The addition of
Steel-fiber-reinforced concrete designed in accor-
dance with TM 5-824-3/AFM 88-6, chapter 3, will
steel fibers and low water-cement ratios produce a
stiff mix, and water-reducing admixtures have often
be appreciably thinner than conventional concrete
been found to be beneficial. Additional information
pavements. For this reason, steel-fiber-reinforced
pavements offer particular advantages where the
can be found in ACI 544.lR, ACI 544.2R, and ACI
thickness of an overlay or pavement must be kept to
544.3R.
a minimum to maintain clearances, grades, and
c-l
Previous Page
