Carbon fiber-reinforced polymer active-passive-confined compression-cast reinforced concrete column incorporating cathodic protection

Patent metadata

Field	Value
Publication number	US-12534811-B2
Application number	US-202519012161-A
Country	US
Kind code	B2
Filing date	Jan 7, 2025
Priority date	Apr 12, 2024
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

Provided is a CFRP active-passive-confined compression-cast RC column incorporating cathodic protection, which includes a CFRP pipe; multiple longitudinal reinforcements inside the CFRP pipe; a stirrup inside the CFRP pipe connected to the longitudinal reinforcements; compression-cast concrete arranged in the CFRP pipe, the multiple longitudinal reinforcements and the stirrup are embedded in the compression-cast concrete; a power supply having a positive electrode connected to the CFRP pipe and a negative electrode connected to the multiple longitudinal reinforcements. The CFRP pipe with a present thickness forms an active confinement on the compression-cast concrete, and the power supply applies a current to the CFRP pipe as an anode to enable the multiple longitudinal reinforcements to obtain electrons, thus stably protecting the multiple longitudinal reinforcements as a cathode.

First claim

What is claimed is:

1 . A carbon fiber-reinforced polymer (CFRP) active-passive-confined compression-cast reinforced concrete (RC) column incorporating cathodic protection, comprising:
a CFRP pipe;
a plurality of longitudinal reinforcements positioned inside the CFRP pipe;
a stirrup positioned inside the CFRP pipe and connected to the plurality of longitudinal reinforcements;
compression-cast concrete arranged in the CFRP pipe, wherein the plurality of longitudinal reinforcements and the stirrup are embedded in the compression-cast concrete; and
a power supply having a positive electrode connected to the CFRP pipe, and a negative electrode connected to the plurality of longitudinal reinforcements; and
a pipe thickness monitoring assembly positioned outside the CFRP pipe and configured to measure a wall thickness of the CFRP pipe, and send, based on a measured wall thickness, a signal for physically adjusting the wall thickness of the CFRP pipe so as to enable the CFRP pipe to maintain the active confinement on the compression-cast concrete;
wherein the CFRP pipe with a present thickness is configured to form an active confinement on the compression-cast concrete, and the power supply is configured to apply a current to the CFRP pipe as an anode to enable the plurality of longitudinal reinforcements to obtain electrons, thus stably protecting the plurality of longitudinal reinforcements as a cathode.

2 . The CFRP active-passive-confined compression-cast RC column incorporating cathodic protection according to claim 1 , wherein the pipe thickness monitoring assembly comprises:
a sensor connected to the CFRP pipe and configured to measure the present wall thickness of the CFRP pipe; and a controller connected to the sensor and sending, based on the measured wall thickness, the signal indicative of physically adjusting the wall thickness of the CFRP pipe.

3 . The CFRP active-passive-confined compression-cast RC column incorporating cathodic protection according to claim 1 , wherein the stirrup is a spiral stirrup, and the spiral stirrup is wound around an outer side of the plurality of longitudinal reinforcements.

4 . The CFRP active-passive-confined compression-cast RC column incorporating cathodic protection according to claim 1 , wherein the plurality of longitudinal reinforcements are electrically connected to one another, the negative electrode of the power supply is connected to the plurality of longitudinal reinforcements via a cathode lead-out wire, and the positive electrode of the power supply is connected to the CFRP pipe via an anode lead-out wire.

5 . The CFRP active-passive-confined compression-cast RC column incorporating cathodic protection according to claim 4 , further comprising:
a calomel electrode embedded in the compression-cast concrete and configured to be connected with one end of a multimeter, the multimeter having an other end connected to the cathode lead-out wire; and/or a solar panel connected to the power supply and configured to store electricity and supply power to the power supply.

6 . A compression casting device for preparing the CFRP active-passive-confined compression-cast RC column incorporating cathodic protection according to claim 1 , comprising:
a bottom plate; a top plate; a formwork holder connected to the bottom plate and the top plate and connected to an outer wall of the CFRP pipe; a high-pressure jack connected to the top plate; a squeeze head connected to the high-pressure jack and configured to press against the compression-cast concrete in the CFRP pipe and the pipe thickness monitoring assembly of claim 1 .

7 . The compression casting device for preparing the CFRP active-passive-confined compression-cast RC column incorporating cathodic protection according to claim 6 , wherein the pipe thickness monitoring assembly comprises:
a sensor connected to the CFRP pipe and configured to measure the wall thickness of the CFRP pipe; and a controller connected to the sensor and sending, based on the measured wall thickness, the signal indicating of physically adjusting the wall thickness of the CFRP pipe.

8 . The compression casting device for preparing the CFRP active-passive-confined compression-cast RC column incorporating cathodic protection according to claim 6 , wherein the stirrup is a spiral stirrup, and the spiral stirrup is wound around an outer side of the plurality of longitudinal reinforcements.

9 . The compression casting device for preparing the CFRP active-passive-confined compression-cast RC column incorporating cathodic protection according to claim 6 , wherein the plurality of longitudinal reinforcements are electrically connected to one another, the negative electrode of the power supply is connected to the plurality of longitudinal reinforcements via a cathode lead-out wire, and the positive electrode of the power supply is connected to the CFRP pipe via an anode lead-out wire.

10 . The compression casting device for preparing the CFRP active-passive-confined compression-cast RC column incorporating cathodic protection according to claim 9 , further comprising:
a calomel electrode embedded in the compression-cast concrete and configured to be connected with one end of a multimeter, the multimeter having an other end connected to the cathode lead-out wire; and/or a solar panel connected to the power supply and configured to store electricity and supply power to the power supply.

Assignees

• Univ Shenzhen

Inventors

• Huang Xiaoxu
• Hu Biao
• Du Tao
• Zhou Yingwu
• Liu Ruibo
• Wu Yufei
• Zhou Xiaoqing
• Wang Xianfeng
• Guo Menghuan

Classifications

• C23F2201/02

  Concrete, e.g. reinforced · CPC title

• E04C3/34

  of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings (E04C3/36 takes precedence) · CPC title

• B28B3/04

  with one ram per mould (B28B3/10 takes precedence) · CPC title

• C23F13/08 Primary

  Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto · CPC title

• B28B23/18

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