Reinforced recycled lump/aggregate concrete precast column and construction method thereof

Patent metadata

Field	Value
Publication number	US-12435513-B2
Application number	US-202018024503-A
Country	US
Kind code	B2
Filing date	Dec 31, 2020
Priority date	Sep 9, 2020
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A reinforced recycled block/aggregate concrete precast column and a construction method are provided. The reinforced recycled block/aggregate concrete precast column includes several first one-bar hoops, vertical reinforcement bars, several second one-bar hoops, a flexible hinge area, and recycled block/aggregate concrete; the first one-bar hoops and second one-bar hoops are each provided with an anchor end; the first one-bar hoops and second one-bar hoops are disposed in the flexible hinge area, and only the second one-bar hoops are disposed outside the flexible hinge area; the outer edge of each first one-bar hoop is flush with the outer surface of the reinforced recycled block/aggregate concrete precast column; and the interior of the reinforced recycled block/aggregate concrete precast column is filled with the recycled block/aggregate concrete, thereby greatly increasing the recycling rate of engineering waste, reducing shedding of a concrete protective layer in the flexible hinge area of the column.

First claim

What is claimed is:

1. A reinforced recycled lump/aggregate concrete precast column, comprising a plurality of first one-bar confinements, longitudinal bars, a plurality of second one-bar confinements, a plastic hinge region, and recycled lump/aggregate concrete;
each of the first one-bar confinements and each of the second one-bar confinements being provided with an anchoring end;
the plurality of first one-bar confinements and some of the plurality of second one-bar confinements being arranged in the plastic hinge region, and some of the second one-bar confinements being arranged outside the plastic hinge region; outer edges of the first one-bar confinements being flush with outer surfaces of the reinforced recycled lump/aggregate concrete precast column, the first one-bar confinements being configured to restrain a concrete cover, and a vertical spacing between two adjacent first one-bar confinements of the first one-bar confinements being not greater than 200 mm; the second one-bar confinements abutting against the longitudinal bars, and the second one-bar confinements being configured to restrain the longitudinal bars;
the anchoring end being formed by bending at 135° twice; and
an interior of the reinforced recycled lump/aggregate concrete precast column being filled with the recycled lump/aggregate concrete, the recycled lump/aggregate concrete consisting of fresh concrete and demolished concrete lumps, and the fresh concrete being recycled aggregate concrete containing recycled coarse aggregates and excavated soil, wherein
a mass ratio of the recycled coarse aggregates to natural coarse aggregates in the fresh concrete is not greater than 4, the excavated soil partially or completely replaces natural sand, and a mass ratio of the excavated soil to the natural sand is not less than 1
a strength grade of the fresh concrete is not lower than C40; and
the demolished concrete lumps are lumps formed by breaking old buildings, structures, and roads after removing all or part of steel bars, and a characteristic size of each of the demolished concrete lumps is not less than 60 mm.

2. The reinforced recycled lump/aggregate concrete precast column according to claim 1 , wherein a mass ratio of the demolished concrete lumps to the fresh concrete in the recycled lump/aggregate concrete is 1:4 to 2:3.

3. The reinforced recycled lump/aggregate concrete precast column according to claim 2 , wherein each of the first one-bar confinements and each of the second one-bar confinements is a stirrup formed by bending a high-strength steel bar for multiple times, and a size of the outer edge of each of the first one-bar confinements is larger than the size of an outer edge of each of the second one-bar confinements.

4. The reinforced recycled lump/aggregate concrete precast column according to claim 3 , wherein a length of each of two straight segments of the anchoring end is not less than a larger value in 10 d and 75 mm, and d is a diameter of the stirrup.

5. The reinforced recycled lump/aggregate concrete precast column according to claim 4 , wherein a height of the plastic hinge region is between 1.0 h and 2.0 h, and h is a cross-sectional height of the reinforced recycled lump/aggregate concrete precast column.

6. The reinforced recycled lump/aggregate concrete precast column according to claim 5 , wherein a spacing between the two adjacent second one-bar confinements in the plastic hinge region is not greater than a smaller value in 6 D and 100 mm, and D is a minimum diameter of the longitudinal bars; and a spacing between the two adjacent second one-bar confinements outside the plastic hinge region is not greater than 10 D.

7. The reinforced recycled lump/aggregate concrete precast column according to claim 1 , wherein a yield strength of each of the first one-bar confinements and the second one-bar confinements is not less than 500 MPa.

8. The reinforced recycled lump/aggregate concrete precast column according to claim 2 , wherein a yield strength of each of the first one-bar confinements and the second one-bar confinements is not less than 500 MPa.

9. The reinforced recycled lump/aggregate concrete precast column according to claim 3 , wherein a yield strength of each of the first one-bar confinements and the second one-bar confinements is not less than 500 MPa.

10. The reinforced recycled lump/aggregate concrete precast column according to claim 4 , wherein a yield strength of each of the first one-bar confinements and the second one-bar confinements is not less than 500 MPa.

Assignees

• Univ South China Tech

Inventors

• Wu Bo
• Lin Lang

Classifications

• B28B23/18

  for the production of elongated articles (B28B23/06 takes precedence) · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title

• E04C5/0636

  Three-dimensional reinforcing mats composed of reinforcing elements laying in two or more parallel planes and connected by separate reinforcing parts (E04C5/0645 takes precedence) · CPC title

• B28B23/02

  wherein the elements are reinforcing members {(B28B23/0006 takes precedence)} · CPC title

• B28B23/0093

  Heavy aggregates or scrap material for making heavy articles · CPC title