US 12,435,513 B2
Reinforced recycled lump/aggregate concrete precast column and construction method thereof
Bo Wu, Guangzhou (CN); and Lang Lin, Guangzhou (CN)
Assigned to SOUTH CHINA UNIVERSITY OF TECHNOLOGY, Guangzhou (CN)
Appl. No. 18/024,503
Filed by SOUTH CHINA UNIVERSITY OF TECHNOLOGY, Guangzhou (CN)
PCT Filed Dec. 31, 2020, PCT No. PCT/CN2020/142575
§ 371(c)(1), (2) Date Mar. 3, 2023,
PCT Pub. No. WO2022/052387, PCT Pub. Date Mar. 17, 2022.
Claims priority of application No. 202010942361.3 (CN), filed on Sep. 9, 2020.
Prior Publication US 2023/0323666 A1, Oct. 12, 2023
Int. Cl. E04C 3/34 (2006.01); B28B 23/02 (2006.01); B28B 23/18 (2006.01); C04B 28/02 (2006.01); E04C 5/06 (2006.01)
CPC E04C 3/34 (2013.01) [B28B 23/02 (2013.01); E04C 5/0636 (2013.01); B28B 23/18 (2013.01); C04B 28/02 (2013.01)] 10 Claims
OG exemplary drawing
 
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.