Post-tensioned concrete with fibers for slabs on supports
AssigneesNV Bekaert SA, Ccl Stressing International Ltd
InventorsHendrik Thooft, Carol Hayek
Life of this patent
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Abstract
A concrete slab resting on at least two supports, the concrete slab comprising conventional concrete and a combined reinforcement of both draped post-tension steel strands and fibers, said post-tension steel strands having a diameter ranging from 5 mm to 20 mm, having a tensile strength higher than 1700 MPa, said fibers being either steel fibers and being present in a dosage ranging from 10 kg/m3 to 75 kg/m3 or being macro-synthetic fibers and being present in a dosage ranging from 1.5 kg/m3 to 9.0 kg/m3, whereby the concrete slab and the supports are fully connected, partially connected or fully disconnected.
Claims29
A concrete slab resting on at least two supports, the concrete slab comprising conventional concrete and a combined reinforcement of draped post-tension steel strands and fibers, wherein the draped post-tension steel strands are positioned:
- in an upper half of the concrete slab above the at least two supports;
- and in a lower half of the concrete slab in between the at least two supports,
- each of said post-tension steel strands
- having a diameter ranging from 5 mm to 20 mm, and
- having a tensile strength higher than 1700 MPa, and
- said fibers being either steel fibers and being present in a dosage ranging from 10 kg/m3 to 75 kg/m3 or being macro-synthetic fibers and being present in a dosage ranging from 1.5 kg/m3 to 9.0 kg/m3,
- wherein the concrete slab and the at least two supports are fully connected, partially connected or fully disconnected, and
- wherein an amount of steel fibers used is below 1 time an amount of steel recommended as rebar replacement.
A concrete slab resting on at least two supports, the concrete slab comprising conventional concrete and a combined reinforcement of draped post-tension steel strands and fibers, wherein the draped post-tension steel strands are positioned:
- in an upper half of the concrete slab above the at least two supports;
- and in a lower half of the concrete slab in between the at least two supports,
- each of said post-tension steel strands
- having a diameter ranging from 5 mm to 20 mm, and
- having a tensile strength higher than 1700 MPa, and
- said fibers being either steel fibers and being present in a dosage ranging from 10 kg/m3 to 75 kg/m3 or being macro-synthetic fibers and being present in a dosage ranging from 1.5 kg/m3 to 9.0 kg/m3,
- wherein the concrete slab and the at least two supports are fully connected, partially connected or fully disconnected, and
- wherein the concrete slab is free of a vapor barrier.
Dependencies are inferred from the claim text.