Fibers having improved sinusoidal configuration, concrete reinforced therewith and related method
US5981630A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1998 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Jan 14, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/298
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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, EQU D.sub.optimum .apprxeq.(0.5 to 1)D.sub.critical, D.sub.critical being that deformity where the ultimate tensile strength of the fiber equals k.sub.1 D.sub.critical +C, and where loads are measured in N; energy in N-mm; length dimensions are in mm, and the values of k.sub.1, k.sub.2, C and C.sub.1 are determined based upon the ultimate tensile stre…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.