Concrete structure repaired and reinforced using textile grid reinforcement and highly durable inorganic binder and method of repairing and reinforcing the same

Patent metadata

Field	Value
Publication number	US-12091360-B2
Application number	US-202117324129-A
Country	US
Kind code	B2
Filing date	May 19, 2021
Priority date	Sep 22, 2020
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

Provided are a concrete structure repaired and reinforced using a textile grid reinforcement and a highly durable inorganic binder and a method of repairing and reinforcing the same, capable of easily repairing and reinforcing an old concrete structure by adhering a textile grid reinforcement, which is coated with a coating material to improve adhesiveness, to the old concrete structure and by adhering a textile grid reinforcement selectively using a highly durable inorganic binder having chloride penetration resistance performance or chemical resistance performance according to a use environment and a reinforcement purpose, that is, by adhering a textile grid reinforcement using an inorganic binder such as cement in place of an organic adhesive. Further, the concrete structure has excellent refractory performance because both the textile grid reinforcement such as a carbon fiber and the highly durable inorganic binder are incombustible materials, and can be effectively applied to reinforcing facilities exposed to the danger of fire.

First claim

What is claimed is:

1. A method of repairing and reinforcing a concrete structure using a textile grid reinforcement and a highly durable inorganic binder, the method comprising:
a) forming a textile grid reinforcement coated with a coating material to improve adhesiveness with an old concrete structure;
b) mixing and making a highly durable inorganic binder according to a use environment of the old concrete structure and repair and reinforcement purposes;
c) pouring shotcrete formed of the highly durable inorganic binder on a surface of the old concrete structure to form a primary mortar layer;
d) placing the textile grid reinforcement at an upper portion of the primary mortar layer;
e) fixing the textile grid reinforcement to the old concrete structure using a grid fixing unit;
f) pouring shotcrete formed of the highly durable inorganic binder on the textile grid reinforcement to form a secondary mortar layer; and
g) hardening the secondary mortar layer to complete repairing and reinforcing of the old concrete structure,
wherein the highly durable inorganic binder of the operation b) is a chloride penetration resistant inorganic binder having chloride penetration resistance performance or a chemical resistant inorganic binder having chemical resistance performance,
wherein the grid fixing unit of the operation d) comprises:
a U-shaped anchor pin as a body driven into the old concrete structure, and
a driving impact buffer provided at an upper end of the anchor pin so as to protect the textile grid reinforcement from a driving impact when the anchor pin is driven; and
the grid fixing unit passes through an upper portion of a grid weft and warp intersection when the textile grid reinforcement is placed, and is fixedly driven into the old concrete structure.

2. The method of claim 1 , wherein, in the case where a degraded portion is present in the old concrete structure, the degraded portion is pre-removed from the old concrete structure prior to performing the operation c), and in the case where a reinforcing bar embedded in the old concrete structure is corroded, a degraded cross section is removed up to a depth of the reinforcing bar, and an additional reinforcing bar is arranged.

3. The method of claim 1 , wherein:
the coating material of the operation a) is an alumina (Al 2 O 3 ) powder used as a sandpaper abrasive material, and a particle size of the coating material is determined according to the type and specifications of the textile grid reinforcement; and
the chloride penetration resistant inorganic binder is formed by mixing 100 parts of weight of cement, 100 parts of weight of a chloride penetration resistant binder, 210 to 250 parts of weight of fine aggregate, 55 to 65 parts of weight of mixing water, and 1.5 to 3 parts of weight of a high-performance water reducing admixture.

4. The method of claim 3 , wherein the chloride penetration resistant binder is formed by mixing 90 to 95 wt % of a fine blast furnace slag powder and 5 to 10 wt % of a salt adsorbent, and the salt adsorbent is calcium carbonate.

5. The method of claim 1 , wherein the chemical resistant inorganic binder is a cement-free binder, and is formed by mixing 100 parts of weight of a fine blast furnace slag powder, 35 to 45 parts of weight of fly ash, 165 to 180 parts of weight of fine aggregate, 55 to 65 parts of weight of mixing water, and 8 to 20 parts of weight of an alkali accelerator.

6. The method of claim 1 , wherein:
before the operation e), the textile grid reinforcement is pulled from both sides thereof to introduce a tensile force such that the textile grid reinforcement is horizontally maintained; and
in the operation e), the grid fixing unit is driven into the old concrete structure by an explosive or pneumatic tacker such that the textile grid reinforcement is firmly fixed to the old concrete structure.

7. A method of repairing and reinforcing a concrete structure using a textile grid reinforcement and a highly durable inorganic binder, the method comprising:
a) forming a textile grid reinforcement coated with a coating material to improve adhesiveness with an old concrete structure;
b) mixing and making a highly durable inorganic binder according to a use environment of the old concrete structure and repair and reinforcement purposes;
c) placing the textile grid reinforcement on a surface of the old concrete structure;
d) fixing the textile grid reinforcement to the old concrete structure using a grid fixing unit;
e) pouring shotcrete formed of the highly durable inorganic binder on the textile grid reinforcement to form a mortar layer in which the textile grid reinforcement is embedded; and
f) hardening the mortar layer to complete repairing and reinforcing of the old concrete structure,
wherein the highly durable inorganic binder of the operation b) is a chloride penetration resistant inorganic binder having chloride penetration resistance performance or a chemical resistant inorganic binder having chemical resistance performance,
wherein the grid fixing unit of the operation d) comprises:
a U-shaped anchor pin as a body driven into the old concrete structure, and
a driving impact buffer provided at an upper end of the anchor pin so as to protect the textile grid reinforcement from a driving impact when the anchor pin is driven; and
the grid fixing unit passes through an upper portion of a grid weft and warp intersection when the textile grid reinforcement is placed, and is fixedly driven into the old concrete structure.

8. A concrete structure repaired and reinforced using a textile grid reinforcement and a highly durable inorganic binder, the concrete structure comprising:
an old concrete structure to be repaired and reinforced;
a textile grid reinforcement adhered to a surface of the old concrete structure to repair and reinforce the old concrete structure and coated with a coating material to improve adhesiveness with the surface of the old concrete structure;
a highly durable inorganic binder mixed as an inorganic binder so as to have chloride penetration resistance performance or chemical resistance performance according to a use environment of the old concrete structure and repair and reinforcement purposes, and configured to adhere the textile grid reinforcement to the old concrete structure; and
a grid fixing unit configured to fix the textile grid reinforcement when the textile grid reinforcement is placed on the old concrete structure,
wherein the highly durable inorganic binder is a chloride penetration resistant inorganic binder having chloride penetration resistance performance or a chemical resistant inorganic binder having chemical resistance performance,
wherein the grid fixing unit comprises a U-shaped anchor pin as a body driven into the old concrete structure, and a driving impact buffer provided at an upper end of the anchor pin so as to protect the textile grid reinforcement form a driving impact when the anchor pin is driven;
the grid fixing unit passes through an upper portion of a grid weft and warp intersection when the textile grid reinforcement is placed, and is fixedly driven into the old concrete structure;
the grid fixing unit is driven into the old concrete structure by an explosive or pneumatic tacker such that the textile grid reinforcement is firmly fixed to the old concrete structure; and
the old concrete structure is a concrete structure from which a degraded portion is pre-removed, and in the case where a reinforcing bar embedded in the old concrete structure is corroded, a degraded cross section is removed up to a depth of the reinforcing bar, and an additional reinforcing bar is arranged.

9. The concrete structure of claim 8 , wherein:
the coating material with

Assignees

• Korea Inst Civil Eng & Building Tech

Inventors

• Kim Hyeong Yeol
• Ryu Gum Sung
• Koh Kyung Taek
• You Young Jun
• An Gi Hong

Classifications

• E04G23/0218 Primary

  Increasing or restoring the load-bearing capacity of building construction elements (E04G23/0203 and E04G23/0266 take precedence) · CPC title

• E04G23/0203

  Arrangements for filling cracks or cavities in building constructions · CPC title

• C04B2111/723

  Repairing reinforced concrete · CPC title

• C04B2111/21

  Efflorescence resistance · CPC title

• C04B2103/0078

  Sorbent materials · CPC title