Method of fabricating a concrete slab system

Patent metadata

Field	Value
Publication number	US-9926701-B2
Application number	US-201715462081-A
Country	US
Kind code	B2
Filing date	Mar 17, 2017
Priority date	Apr 7, 2016
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A method of fabricating a concrete slab system places bed of a first concrete on a base. The bed has a top surface, a bottom surface, and edge surfaces. The bed is exposed to a drying environment such that the top surface develops shrinkage cracks and portions of the bed separate from the base. A force applied to the top surface induces non-shrinkage cracks in the bed that extend to the bed's bottom surface. Non-concrete material is placed on the bed's top surface and on each of its edge surfaces. The non-concrete material and bed are covered with a second concrete having stretchable fibers mixed therein.

First claim

What is claimed as new and desired to be secured by Letters Patent of the United States is:

1. A method of fabricating a concrete slab system, comprising the steps of:
placing a bed of a first concrete on a base, said bed having a top surface, a bottom surface, and edge surfaces;
exposing said bed to a drying environment wherein said top surface develops shrinkage cracks, and wherein portions of said bed separate from said base;
applying a force to said top surface at said portions of said bed to induce non-shrinkage cracks in said bed wherein said non-shrinkage cracks extend to said bottom surface;
placing non-concrete material on said top surface and on each of said edge surfaces; and
covering said non-concrete material and said bed with a second concrete having stretchable fibers mixed therein, wherein said non-concrete material reduces friction between said bed and said second concrete and prevents bonding between said bed and said second concrete.

2. A method of fabricating a concrete slab system, comprising the steps of:
placing a bed of a first concrete on a base, said bed having a top surface, a bottom surface, and edge surfaces;
exposing said bed to a drying environment wherein said top surface develops shrinkage cracks, and wherein portions of said bed separate from said base;
applying a force to said top surface at said portions of said bed to induce non-shrinkage cracks in said bed wherein said non-shrinkage cracks extend to said bottom surface;
placing non-concrete material on said top surface and on each of said edge surfaces; and
covering said non-concrete material and said bed with a second concrete having stretchable fibers mixed therein, wherein each cubic yard of said second concrete has 3-65 pounds of said stretchable fibers mixed therein.

3. A method according to claim 2 , wherein each of said non-shrinkage cracks is V-shaped in cross-section.

4. A method according to claim 2 , wherein said step of applying a force occurs all around a perimeter region of said bed.

5. A method according to claim 2 , wherein said stretchable fibers are selected from the group consisting of polymer fibers and metal fibers.

6. A method according to claim 2 , wherein said non-concrete material comprises at least one layer of a polymer material.

7. A method according to claim 2 , wherein said first concrete comprises a non-fibrous concrete.

8. A method of fabricating a concrete slab system, comprising the steps of:
placing a bed of a first concrete in a plastic state on a base, said bed having a top surface, a bottom surface, and edge surfaces;
exposing said bed to a drying environment wherein said first concrete in said plastic state cures to thereby cause said top surface to develop shrinkage cracks and cause portions of said bed to separate from said base;
applying, after said step of exposing, a force to said top surface at said portions of said bed to induce non-shrinkage cracks in said bed wherein widths of said non-shrinkage cracks are greater than widths of said shrinkage cracks, said non-shrinkage cracks extending to said bottom surface to thereby generate broken regions of said bed at said portions thereof wherein said bottom surface at said broken regions is in contact with said base;
placing non-concrete material on said top surface and on each of said edge surfaces; and
covering said non-concrete material and said bed with a second concrete in a plastic state, said second concrete having stretchable fibers mixed therein, wherein said non-concrete material reduces friction between said bed and said second concrete and prevents bonding between said bed and said second concrete.

9. A method of fabricating a concrete slab system, comprising the steps of:
placing a bed of a first concrete in a plastic state on a base, said bed having a top surface, a bottom surface, and edge surfaces;
exposing said bed to a drying environment wherein said first concrete in said plastic state cures to thereby cause said top surface to develop shrinkage cracks and cause portions of said bed to separate from said base;
applying, after said step of exposing, a force to said top surface at said portions of said bed to induce non-shrinkage cracks in said bed wherein widths of said non-shrinkage cracks are greater than widths of said shrinkage cracks, said non-shrinkage cracks extending to said bottom surface to thereby generate broken regions of said bed at said portions thereof wherein said bottom surface at said broken regions is in contact with said base;
placing non-concrete material on said top surface and on each of said edge surfaces; and
covering said non-concrete material and said bed with a second concrete in a plastic state, said second concrete having stretchable fibers mixed therein, wherein each cubic yard of said second concrete has 3-65 pounds of said stretchable fibers mixed therein.

10. A method according to claim 9 , wherein each of said non-shrinkage cracks is V-shaped in cross-section.

11. A method according to claim 9 , wherein said step of applying a force occurs all around a perimeter region of said bed.

12. A method according to claim 9 , wherein said stretchable fibers are selected from the group consisting of polymer fibers and metal fibers.

13. A method according to claim 9 , wherein said non-concrete material comprises at least one layer of a polymer material.

14. A method according to claim 9 , wherein said first concrete comprises a non-fibrous concrete.

15. A method of fabricating a concrete slab system, comprising the steps of:
placing a bed of a first concrete in a plastic state on a base, said bed having a top surface, a bottom surface in contact with said base, and edge surfaces;
exposing said bed to a drying environment wherein said first concrete in said plastic state cures to thereby cause said top surface to develop shrinkage cracks and cause portions of said bed to curl away from said base, wherein said bottom surface associated with each of said portions of said bed is spaced apart from said base;
applying, after said step of exposing, a force to said top surface at said portions of said bed to induce non-shrinkage cracks in said bed wherein widths of said non-shrinkage cracks are greater than widths of said shrinkage cracks, said non-shrinkage cracks extending to said bottom surface thereby breaking said portions of said bed from said bed wherein said bottom surface associated with each of said portions of said bed is in contact with said base;
placing non-concrete material on said top surface and on each of said edge surfaces; and
covering said non-concrete material and said bed with a second concrete in a plastic state, said second concrete having stretchable fibers mixed therein, wherein said non-concrete material reduces friction between said bed and said second concrete and prevents bonding between said bed and said second concrete.

16. A method of fabricating a concrete slab system, comprising the steps of:
placing a bed of a first concrete in a plastic state on a base, said bed having a top surface, a bottom surface in contact with said base, and edge surfaces;
exposing said bed to a drying environment wherein said first concrete in said plastic state cures to thereby cause said top surface to develop shrinkage cracks and cause portions of said bed to curl away from said base, wherein said bottom surface associated with each of said portions of said bed is spaced apart from said base;
applying, after said step of exposing, a force to said top surface at said portions of said bed to induce non-shrinkage cracks in said bed wherein widths of

Assignees

• Gcp Applied Tech Inc

Inventors

• Face S Allen
• Scurto Gregory M

Classifications

• E04B5/32 Primary

  Floor structures wholly cast in situ with or without form units or reinforcements · CPC title

• E02D27/02 Primary

  Flat foundations without substantial excavation (E02D27/04, E02D27/08 take precedence) · CPC title

• C04B14/48

  Metal · CPC title

• C04B41/009

  characterised by the material treated · CPC title

• C04B2111/00482

  Coating or impregnation materials · CPC title