Carbon-negative concrete pole with stress self-sensing and damage self-repairing functions

Abstract

This invention relates to the field of building materials and civil engineering, and in particular to a negative carbon concrete pole with stress self-sensing and damage self-repair functions. The pole includes a smart negative carbon concrete pole body, with a self-sensing monitoring module internally and an external auxiliary fixing structure externally. The pole body is made of carbonized cured steel slag concrete. The self-sensing monitoring module includes a conductive fiber mesh and repair agent microcapsules. This invention integrates three cutting-edge technologies—negative carbon properties, self-sensing, and self-repair—to create a new type of infrastructure material with autonomous intelligence. It achieves real-time monitoring and early warning of the pole's health status throughout its entire life cycle, greatly improving safety. The self-repair mechanism extends the pole's service life, reducing maintenance costs and resource consumption. Simultaneously, it utilizes industrial waste and carbon dioxide, achieving a negative carbon environmental protection goal and meeting the requirements of sustainable development.

Description

Technical Field

[0001] This invention relates to the field of building materials and civil engineering, and in particular to a negative carbon concrete pole with stress self-sensing and damage self-repair functions. Background Technology

[0002] Traditional concrete poles, as an important component of power transmission infrastructure, have two main drawbacks: first, they emit large amounts of carbon dioxide during production, which does not meet the goal of carbon neutrality; second, they lack self-monitoring and repair capabilities, requiring manual inspection and maintenance when damage occurs, which is costly and inefficient.

[0003] In existing technologies, self-sensing concrete and self-healing concrete are mostly developed as independent technologies, and there is no innovative solution that integrates these two intelligent characteristics with negative carbon characteristics into pole products. At the same time, existing poles cannot monitor their own status in real time, nor can they achieve autonomous repair in the early stages of damage, leading to safety hazards and shortened lifespan. Therefore, a negative carbon concrete pole with stress self-sensing and damage self-healing functions is proposed. Summary of the Invention

[0004] In view of the problems existing in the above or prior art, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a negative carbon concrete pole with stress self-sensing and damage self-repair functions.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: including, The main body of the intelligent negative carbon concrete pole is equipped with a self-sensing monitoring module inside and an external auxiliary fixing structure on the outside.

[0007] As a preferred embodiment of the present invention, the intelligent negative carbon concrete pole with stress self-sensing and damage self-repair functions is wherein the main body of the intelligent negative carbon concrete pole is made of carbonized cured steel slag concrete.

[0008] As a preferred embodiment of the present invention, a carbon-concrete pole with stress self-sensing and damage self-repair functions is provided, wherein the self-sensing monitoring module includes a conductive fiber mesh and repair agent microcapsules.

[0009] As a preferred embodiment of the present invention, the negative carbon concrete pole with stress self-sensing and damage self-repair functions is wherein: the conductive fiber network is uniformly dispersed inside the main body of the intelligent negative carbon concrete pole, and is used to monitor the stress-strain state and damage of the pole in real time.

[0010] As a preferred embodiment of the present invention, the negative carbon concrete pole with stress self-sensing and damage self-repair functions is wherein: the repair agent microcapsules are uniformly dispersed inside the main body of the intelligent negative carbon concrete pole; when microcracks appear in the main body of the intelligent negative carbon concrete pole, the repair agent microcapsules can rupture and release the repair agent to achieve self-repair.

[0011] As a preferred embodiment of the present invention, the negative carbon concrete pole with stress self-sensing and damage self-repair functions is wherein: the conductive fiber network is made of recycled carbon fiber, and the volumetric content of the conductive fiber network inside the main body of the intelligent negative carbon concrete pole is 0.5%-2%, which can form a distributed sensor network to reflect the stress state of the pole in real time through resistance changes.

[0012] As a preferred embodiment of the present invention, a carbon-reinforced concrete pole with stress self-sensing and damage self-repair functions, wherein: the repair agent microcapsule uses urea-formaldehyde resin as the wall material and epoxy resin or a culture medium containing Bacillus pasteurellii as the core material; after the repair agent microcapsule is released upon rupture, the crack is repaired through chemical curing or microbial-induced calcium carbonate precipitation.

[0013] As a preferred embodiment of the present invention, the intelligent negative carbon concrete pole with stress self-sensing and damage self-repair functions is wherein: the main body of the intelligent negative carbon concrete pole uses industrial waste steel slag as the cementing material.

[0014] As a preferred embodiment of the present invention, the negative carbon concrete pole with stress self-sensing and damage self-repair functions is provided, wherein: the external auxiliary fixing structure includes a clamping hoop attached to the middle section of the outer side of the main body of the intelligent negative carbon concrete pole, a bottom pre-embedded fixing seat embedded in the bottom of the main body of the intelligent negative carbon concrete pole, and a top conductor fixing frame installed on the top of the main body of the intelligent negative carbon concrete pole, and an insulator is also provided at the top of the top conductor fixing frame.

[0015] As a preferred embodiment of the present invention, the negative carbon concrete pole with stress self-sensing and damage self-repair functions is wherein: electrodes are installed on both sides of the outer wall of the main body of the intelligent negative carbon concrete pole, and the electrodes are electrically connected to the conductive fiber network.

[0016] The beneficial effects of the negative carbon concrete pole with stress self-sensing and damage self-repair functions of the present invention are as follows: By integrating three cutting-edge technologies—negative carbon properties, self-sensing, and self-repair—a new type of infrastructure material with autonomous intelligence is created; real-time monitoring and early warning of the pole's health status throughout its entire life cycle are achieved, greatly improving safety; the self-repair mechanism extends the pole's service life, reduces maintenance costs and resource consumption, and at the same time utilizes industrial waste and carbon dioxide, achieving the goal of negative carbon environmental protection and meeting the requirements of sustainable development. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a carbon-negative concrete pole with stress self-sensing and damage self-repair functions.

[0019] Figure 2 This is a schematic diagram of the internal structure of a carbon-negative concrete pole with stress self-sensing and damage self-repair functions.

[0020] Figure 3 This is a block diagram illustrating the monitoring principle of a self-sensing monitoring module for a carbon-negative concrete pole with stress self-sensing and damage self-repair functions.

[0021] In the diagram: 1. Intelligent negative carbon concrete pole body; 2. Self-sensing monitoring module; 21. Conductive fiber mesh; 22. Repair agent microcapsules; 3. External auxiliary fixing structure; 31. Hoop; 32. Bottom pre-embedded fixing seat; 33. Top wire fixing frame. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Example 1, referring to Figures 1-3 This is the first embodiment of the present invention. This embodiment provides a negative carbon concrete pole with stress self-sensing and damage self-repair functions. It includes a smart negative carbon concrete pole body 1, a self-sensing monitoring module 2 is provided inside the smart negative carbon concrete pole body 1, and an external auxiliary fixing structure is provided outside the smart negative carbon concrete pole body 1.

[0024] Specifically, the main body 1 of the intelligent negative carbon concrete pole is made of carbonized steel slag concrete, with the following specific proportions: steel slag (replacing 30%-50% of aggregate), silicate cement, water, and water-reducing agent (0.8%-1.2% of the total cementitious materials). During preparation, the steel slag and cement are first dry-mixed evenly, and then the water-reducing agent and water are added and stirred into a concrete mixture. Subsequently, CO2 carbonization curing is carried out (carbonation pressure 0.3-0.5MPa, carbonization time 24-48h), which fixes CO2 in the concrete during the hardening process, forming negative carbon properties. Its 28-day compressive strength is not less than C50, which meets the structural load-bearing requirements of the pole.

[0025] The self-sensing monitoring module 2 includes a conductive fiber mesh 21 and a repair agent microcapsule 22.

[0026] A conductive fiber network is uniformly dispersed inside the main body 1 of the intelligent negative carbon concrete pole. Recycled carbon fibers are pretreated (removing surface impurities and cutting into 5-10mm short fibers) and added to the concrete mixture at a volume ratio of 0.5%-2%. Uniform dispersion is achieved through high-speed stirring (800-1000 r / min). This conductive fiber network forms a distributed sensor. When the pole is subjected to load and generates stress and strain or micro-damage, the contact state between the fibers changes, resulting in a change in the overall resistance of the pole. By monitoring the rate of change in resistance, the magnitude of stress and strain and the degree of damage can be inferred.

[0027] The repair agent microcapsules 22 are uniformly dispersed inside the main body 1 of the intelligent negative carbon concrete pole. The microcapsules adopt a double-layer structure of "wall material-core material": the wall material is urea-formaldehyde resin (thickness 5-15μm), and the core material is divided into two types: chemical repair type: epoxy resin (accounting for 80%-90% of the total core material) and curing agent (accounting for 10%-20%, such as amine curing agent) encapsulated in a certain proportion; or biorepair type: liquid culture medium containing Bacillus pasteurellii (bacterial concentration 10). 6 -10 8 (CFU / mL); the microcapsules have a particle size of 100-300μm and are added at a mass ratio of 3%-5% during the concrete mixing stage. During mixing, the capsules are kept intact and evenly distributed within the matrix. When microcracks ≥0.1mm wide appear on the pole, the cracks compress the microcapsules during propagation, causing the wall material to rupture and releasing the core material—the chemical core material. This core material undergoes a curing reaction at the crack, forming a dense colloid that fills the crack within 24-72 hours. The *Pasteurella multocida* in the biological core material is activated upon contact with air and moisture at the crack, inducing the release of Ca2+ from the surrounding environment. 2+ Calcium carbonate precipitate is formed, and the crack is repaired within 7-14 days. The compressive strength recovery rate at the crack after repair is ≥80%.

[0028] The external auxiliary fixing structure includes a clamp 31 that is clamped to the middle of the outer side of the intelligent negative carbon concrete pole body 1, a bottom pre-embedded fixing seat 32 embedded in the bottom of the intelligent negative carbon concrete pole body 1, and a top conductor fixing bracket 33 installed on the top of the intelligent negative carbon concrete pole body 1. The bottom pre-embedded fixing seat 32 is made of Q235 steel, is inverted conical in shape, and is cast integrally with the bottom of the pole body. The pre-embedded depth is not less than 1 / 6 of the total height of the pole, which enhances the pole's anti-overturning ability. The top conductor fixing bracket 33 is made of insulating material (such as epoxy resin) and is connected to the top of the pole by bolts. It is used to fix the transmission conductor, avoid the conductor tension acting directly on the pole body, reduce local stress concentration, and the top of the top conductor fixing bracket 33 is also equipped with an insulator.

[0029] Electrodes are installed on both sides of the outer wall of the main body 1 of the intelligent negative carbon concrete pole. The electrodes are electrically connected to the conductive fiber network. The pole's real-time resistance value is collected through the connection between the electrodes and the conductive fiber network at both ends of the pole body (the collection frequency can be customized, ranging from 1 to 60 minutes / time). The data transmission unit transmits the resistance data to the terminal analysis platform via LoRa or NB-IoT wireless communication technology. The platform has a built-in algorithm that calculates the resistance change rate (ΔR / R0, where R0 is the initial resistance and ΔR is the difference between the real-time resistance and the initial resistance) to determine the pole's status: when ΔR / R0 is within ±5%, it is considered to be in a normal state; when ΔR / R0 is between 5% and 15%, it is considered to be slightly damaged and an early warning is issued; when ΔR / R0 > 15%, it is considered to be severely damaged and an emergency warning is issued.

[0030] Example 2, refer to Figures 1-3 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a process for the preparation and application of negative carbon concrete poles with stress self-sensing and damage self-repair functions.

[0031] Material preparation: Prepare negative carbon concrete mixture according to the formula. First, add recycled carbon fiber (volume dosage 0.5%-2%) and stir at high speed for 5-8 minutes. Then add microcapsules (mass dosage 3%-5%) and stir at low speed for 2-3 minutes (rotation speed 300-500 r / min) to ensure that the fiber and 12 microcapsules are evenly dispersed and that the microcapsules are not broken. Pole forming: Pour the above mixture into the steel mold of the pole (the inner wall of the mold is coated with a release agent), and use vibration forming (vibration frequency 50-60Hz, vibration time 10-15min) to remove air bubbles; then move the mold to the carbonization curing chamber and cure it under 0.3-0.5MPaCO2 pressure for 24-48h, and then perform standard curing for 7 days. Monitoring module installation: The conductive fibers are exposed by grinding the surfaces at both ends of the pole body, copper electrodes are attached, and the resistance acquisition unit is connected by wires. The data transmission unit is installed on the outer side of the middle part of the pole to ensure smooth wireless signal transmission. On-site installation: The pre-embedded fixing base 32 at the bottom of the pole is embedded into the pre-set foundation pit, and then fixed with concrete backfill. The conductor fixing bracket is installed on the top and the transmission conductor is connected. Debugging and operation: Start the self-sensing monitoring module 2, record the initial resistance value R0 of the pole, set the early warning threshold, and enter the real-time monitoring mode; check the microcapsule repair effect regularly (e.g., every 3 months), and the crack closure can be detected by core drilling or ultrasonic testing.

[0032] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A carbon-reinforced concrete pole with stress self-sensing and damage self-repair functions, characterized in that: The system includes a smart negative carbon concrete pole body (1), which is equipped with a self-sensing monitoring module (2) inside and an external auxiliary fixing structure outside.

2. The negative carbon concrete pole with stress self-sensing and damage self-repair functions as described in claim 1, characterized in that: The main body (1) of the intelligent negative carbon concrete pole is made of steel slag concrete that has been carbonized and cured.

3. The negative carbon concrete pole with stress self-sensing and damage self-repair functions as described in claim 1 or 2, characterized in that: The self-sensing monitoring module (2) includes a conductive fiber mesh (21) and repair agent microcapsules (22).

4. The negative carbon concrete pole with stress self-sensing and damage self-repair functions as described in claim 3, characterized in that: The conductive fiber network is uniformly dispersed inside the main body (1) of the intelligent negative carbon concrete pole, and is used to monitor the stress-strain state and damage of the pole in real time.

5. The negative carbon concrete pole with stress self-sensing and damage self-repair functions as described in claim 4, characterized in that: The repair agent microcapsules (22) are uniformly dispersed inside the intelligent negative carbon concrete pole body (1). When microcracks appear in the intelligent negative carbon concrete pole body (1), the repair agent microcapsules (22) can rupture and release the repair agent to achieve self-repair.

6. The negative carbon concrete pole with stress self-sensing and damage self-repair functions as described in claim 5, characterized in that: The conductive fiber network is made of recycled carbon fiber. The volumetric content of the conductive fiber network inside the intelligent negative carbon concrete pole body (1) is 0.5%-2%, which can form a distributed sensor network to reflect the stress state of the pole in real time through resistance changes.

7. The negative carbon concrete pole with stress self-sensing and damage self-repair functions as described in claim 6, characterized in that: The repair agent microcapsule (22) uses urea-formaldehyde resin as the wall material and epoxy resin or culture medium containing Bacillus pasteurellis as the core material. After the repair agent microcapsule (22) is released by rupture, it can achieve crack repair through chemical curing or microbial-induced calcium carbonate precipitation.

8. The negative carbon concrete pole with stress self-sensing and damage self-repair functions as described in claim 7, characterized in that: The main body of the intelligent negative carbon concrete pole (1) uses industrial waste steel slag as the cementing material.

9. The negative carbon concrete pole with stress self-sensing and damage self-repair functions as described in claim 8, characterized in that: The external auxiliary fixing structure includes a clamp (31) clamped in the middle of the outside of the main body (1) of the intelligent negative carbon concrete pole, a bottom pre-embedded fixing seat (32) embedded in the bottom of the main body (1) of the intelligent negative carbon concrete pole, and a top conductor fixing frame (33) installed on the top of the main body (1) of the intelligent negative carbon concrete pole. An insulator is also provided at the top of the top conductor fixing frame (33).

10. The negative carbon concrete pole with stress self-sensing and damage self-repair functions as described in claim 9, characterized in that: Electrodes are installed on both sides of the outer wall of the main body (1) of the intelligent negative carbon concrete pole, and the electrodes are electrically connected to the conductive fiber network.

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