Fibers having improved sinusoidal configuration, concrete reinfo

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

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106703, 106713, 106727, 106797, 106823, 428364, 428369, 428370, 428371, 428375, 428378, 428383, 428400, 428401, 428606, 524 2, 524 7, E04C 500, B32B 2700

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059816309

ABSTRACT:
Fiber additives for addition to proportioned concrete comprise a plurality of thermoplastic fibers having a profile geometry defined by the equation, ##EQU1## wherein the amplitude a.sub.0 falls within a range of from about 0.1 d.sub.f to 2.0 d.sub.f and the period .lambda. falls within a range of from about 2 d.sub.f to 15 d.sub.f for fibers having a diameter d.sub.f of from about 0.5 to about 1 mm; the peak pull-out stress .sigma..sub.peak and the specific pull-out energy absorbed to a maximal displacement of 7.5 mm .psi..sub.peak, both increase linearly with a deformity factor defined by the equation, ##EQU2## where .alpha.=0.8 and .beta.=-1, such that the peak pull-out stress is defined by the equation, ##EQU3## and the specific pull-out energy is defined by the equation, ##EQU4## the fiber additives having an optimimum deformity,

REFERENCES:
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patent: 5628822 (1997-05-01), Hogan
Banthia et al., "Concrete Reinforced With Deformed Steel Fibers Bond-Slip Mechanisms" ACI Materials Journal, V. 91, No. 5, Sep.-Oct., 1994.

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