SELF-HEALING FIBER-REINFORCED CONCRETE INCORPORATING MICROCAPSULES FOR AUTONOMOUS CRACK REPAIR

Abstract

Abstract The invention provides a self-healing fiber-reinforced concrete (FRC) composition designed to autonomously repair cracks, thereby enhancing durability and reducing maintenance requirements. This composition integrates microcapsules filled with healing agents (106), such as epoxy resins or other polymeric compounds, which are embedded within the concrete matrix. When cracks form, the microcapsules rupture, releasing the healing agent into the crack, where it polymerizes to seal the void and restore structural integrity. Additionally, a combination of synthetic and natural fibers (108) is incorporated to improve the concrete’s tensile strength, impact resistance, and flexibility, further minimizing crack propagation. The FRC composition is ideal for high-demand infrastructure applications, such as bridges, highways, tunnels, and industrial floors, where long-term durability and minimal maintenance are essential. By combining autonomous healing with fiber reinforcement (102), the invention offers a robust, sustainable solution for extending the lifespan of concrete structures in critical environments. The figure associated with the abstract is Fig.1

Specification

Description:DESCRIPTION
Technical Field of the Invention

The present invention relates to construction materials, particularly to a self-healing fibre-reinforced concrete (FRC) composition with autonomous crack-repairing capabilities. The FRC is designed to extend the lifespan and enhance the structural integrity of concrete by incorporating microcapsules filled with healing agents (106), which activate upon crack formation.

Background of the Invention

Concrete is one of the most widely used materials in construction due to its high compressive strength and versatility. However, concrete is susceptible to cracking over time due to environmental stressors, mechanical loads, and thermal fluctuations. These cracks, especially when left untreated, can compromise structural integrity, allowing water, chemicals, and other corrosive agents to penetrate and degrade the material further. Traditionally, repairing concrete cracks requires labor-intensive methods that are costly, time-consuming, and often impractical, particularly in large-scale infrastructure projects such as bridges, highways, and tunnels.

In recent years, the concept of self-healing concrete has emerged as a promising solution to address these limitations. Self-healing concrete integrates specialized materials, such as microcapsules filled with healing agents (106), that respond to cracking autonomously, releasing agents that fill and seal the cracks without external intervention. This technology has shown potential in enhancing concrete's lifespan by mitigating crack propagation and subsequent structural degradation.

However, most current self-healing concrete solutions are limited in terms of their mechanical reinforcement and healing efficiency. The integration of fiber reinforcement (102) with self-healing technology can offer significant improvements. Fibers, both synthetic and natural, can help arrest crack formation by improving tensile strength, impact resistance, and overall durability of the concrete matrix. This invention leverages the synergy between fiber reinforcement (102) and microcapsule-based self-healing mechanisms to create a robust, high-performance concrete composition capable of autonomously repairing cracks. This dual approach not only enhances the structural resilience of the concrete but also reduces maintenance costs, making it ideal for critical infrastructure applications where durability and reliability are paramount.

Brief summary of the Invention

The following presents a simplified summary of the disclosure in order to provide a basic understanding to the reader. This summary is not an extensive overview of the disclosure and it does not identify key/critical elements of the invention or delineate the scope of the invention. Its sole purpose is to present some concepts disclosed herein in a simplified form as a prelude to the more detailed description that is presented later.

The primary objective of this invention is to develop a self-healing concrete that autonomously repairs cracks upon formation.

Another key objective is improve the tensile strength and durability of concrete using a combination of synthetic and natural fibres.

According to an aspect of the present invention, a novel solution to extend the durability and performance of concrete structures through an advanced self-healing fibre-reinforced concrete (FRC) composition. This innovative concrete composition is specifically engineered to autonomously repair cracks and prevent structural degradation without external intervention. By incorporating microcapsules filled with healing agents (106) and a combination of synthetic and natural fibres, the invention addresses both the mechanical weaknesses and the maintenance challenges associated with conventional concrete.

In accordance with the aspect of the present invention, the primary self-healing mechanism of the invention is achieved by embedding microcapsules within the concrete matrix. These microcapsules contain healing agents (106) such as epoxy resins, polyurethane, or other polymeric compounds capable of curing upon exposure to air or moisture. When a crack forms within the concrete, the mechanical stress causes these microcapsules to rupture, releasing the healing agent directly into the crack. The released agent subsequently hardens, filling the void and effectively sealing the crack. This autonomous repair process prevents further crack propagation and reduces the risk of structural damage from moisture, chemicals, and other corrosive agents that may infiltrate the concrete. As a result, the concrete's longevity is significantly enhanced, especially in demanding applications like infrastructure projects where structural integrity and durability are critical.

In accordance with the aspect of the present invention, the invention includes a fibre-reinforced component that greatly improves the mechanical properties of the concrete. Fibbers are known to enhance the tensile strength, impact resistance, and flexibility of concrete, reducing the likelihood of crack formation. In this composition, both synthetic fibres (such as polypropylene or glass fibres) and natural fibres (such as coconut coir or jute) are distributed within the concrete matrix. Synthetic fibres provide high tensile strength and contribute to the load-bearing capacity of the concrete, while natural fibres add toughness and flexibility. Together, these fibres help arrest crack formation by absorbing stress and redistributing it throughout the concrete matrix, which further complements the self-healing function by reducing the frequency and severity of cracks.

In accordance with the aspect of the present invention, the combined effect of fibre reinforcement and autonomous crack repair presents a significant advantage over traditional concrete in terms of durability, reliability, and maintenance requirements. Traditional repair methods for concrete structures are labour-intensive, costly, and often impractical for large-scale infrastructure like bridges, highways, and tunnels. By enabling the concrete to heal itself automatically, this invention minimizes the need for frequent maintenance and reduces the long-term costs associated with concrete repair. This quality makes the FRC composition particularly valuable for infrastructure applications where accessibility and routine maintenance are challenging and where structural resilience is of utmost importance.

In accordance with the aspect of the present invention, the invention represents a holistic approach to enhancing concrete performance. The integration of self-healing technology with fibre reinforcement produces a material that not only repairs itself but also resists cracking in the first place, making it highly suitable for critical construction projects exposed to high levels of stress and environmental challenges. By addressing both the durability and maintenance limitations of conventional concrete, this fibre-reinforced, self-healing concrete composition offers a sustainable solution for extending the lifespan of concrete structures, ultimately contributing to more resilient and low-maintenance infrastructure.

Further objects, features, and advantages of the invention will be readily apparent from the following description of the preferred embodiments thereof, taken in conjunction with the accompanying drawings.

Brief Summary of the Drawings

The invention will be further understood from the following detailed description of a preferred embodiment taken in conjunction with an appended drawing, in which:

Fig. 1 illustrates the flowchart for the self-healing fiber-reinforced concrete (FRC) composition, in accordance with an exemplary embodiment of the present invention.

Detailed Description of the Invention

The detailed description of the invention presents a comprehensive view of an automated system designed to revolutionize the production of short news videos, primarily for consumption on digital platforms such as social media. The invention significantly automates the production process, integrating advanced technological components that streamline operations from the capturing of footage to the editing and publishing stages.

According to an exemplary embodiment of the present invention, a self-healing fibre-reinforced concrete (FRC) composition designed to autonomously repair cracks and prevent structural deterioration. This high-performance concrete composition includes a unique combination of microcapsules containing healing agents (106) and a blend of synthetic and natural fibres, which work together to enhance the concrete's mechanical properties and provide an autonomous crack-healing capability.

In accordance with the exemplary embodiment of the present invention, the self-healing FRC composition comprises several critical components:
a. Cementitious Matrix(103): The concrete matrix is primarily composed of traditional cementitious materials, such as Portland cement, sand, and aggregates, which form the fundamental structure of the concrete. This matrix provides the necessary compressive strength and serves as the medium for dispersing microcapsules and fibers.

b. Microcapsules with Healing Agents (101): A defining feature of the invention is the inclusion of microcapsules, which are embedded throughout the cementitious matrix (103). These microcapsules contain healing agents (106), such as epoxy resins, polyurethane, or other polymeric compounds, capable of curing when exposed to air or moisture. The microcapsules have a brittle shell that ruptures upon experiencing stress or crack formation in the concrete. When the microcapsules break, they release the healing agent into the crack, where it polymerizes or hardens to seal the void, effectively preventing the crack from propagating. This self-healing mechanism is autonomously triggered, requiring no external intervention.

c. Fiber Reinforcement(102): The invention incorporates a blend of synthetic and natural fibers (108) to reinforce the concrete, enhancing its tensile strength, impact resistance, and flexibility. Synthetic fibers (107), such as polypropylene or glass fibers, provide high tensile strength and durability, which improve the concrete's load-bearing capacity and resistance to crack initiation. Natural fibers (108), like coconut coir or jute, add flexibility and toughness, helping the concrete absorb and distribute stress. Together, these fibers mitigate crack formation by distributing load and improving the overall toughness of the concrete matrix. The fibers are typically included in proportions ranging from 0.5% to 2% by volume of the composition, ensuring they enhance the mechanical properties without compromising workability.

d. Additional Aggregates and Additives (104): The FRC composition may also include standard aggregates (e.g., sand, gravel) and additives to adjust properties such as workability, setting time, and durability. These additives allow the concrete to be optimized for various application conditions.

In accordance with the exemplary embodiment of the present invention, to create a homogeneous self-healing FRC, the components are mixed in a specific sequence. The cement and aggregates are initially blended, followed by the addition of fibers to ensure even distribution. The microcapsules are then gently mixed in to avoid premature rupture. This mixture is cast into molds and allowed to set under controlled conditions, producing a durable concrete composition with self-healing capabilities.

In accordance with the exemplary embodiment of the present invention, when a crack forms in the concrete due to stress or environmental factors, the microcapsules near the crack rupture, releasing the healing agent. Upon exposure to air or moisture, the agent hardens, filling and sealing the crack. This process not only repairs the crack but also restores the structural integrity of the concrete, reducing the risk of further damage from moisture and corrosive elements.

Applications and Advantages:
This self-healing FRC is particularly beneficial for infrastructure projects like bridges, highways, tunnels, and industrial floors, where minimal maintenance and extended service life are crucial. The autonomous crack repair reduces the need for costly repairs, making the material a sustainable choice for high-stress applications. By combining self-healing technology with fiber reinforcement (102), the invention provides a durable, resilient, and low-maintenance concrete solution suitable for modern infrastructure demands.
, Claims:5. CLAIMS
I/We Claim
1. A self-healing fiber-reinforced concrete (FRC) composition, comprising:
a. a cementitious matrix (103);
b. microcapsules dispersed within the matrix, each containing a healing agent selected from epoxy resin, polyurethane, or polymeric compounds that cure upon exposure to air or moisture;
c. a combination of synthetic and natural fibers (108) distributed within the matrix to improve tensile strength, impact resistance, and flexibility; and
d. standard concrete aggregates and optional additives to adjust workability, setting time, or durability,
e. wherein the microcapsules rupture upon crack formation (105), releasing the healing agent to autonomously repair the crack and restore structural integrity.

2. The self-healing fiber-reinforced concrete composition as claimed in claim 1, wherein the microcapsules have a brittle shell that is configured to rupture upon mechanical stress associated with crack formation..

3. The fiber-reinforced concrete composition as claimed in claim 1, wherein the healing agent is an epoxy resin that polymerizes upon contact with air, effectively filling and sealing the crack.

4. The fiber-reinforced concrete composition as claimed in claim 1, wherein the synthetic fibers (107) are selected from polypropylene, glass, or carbon fibers to enhance the tensile strength of the concrete matrix.


5. The fiber-reinforced concrete composition as claimed in claim 1, wherein the natural fibers (108) are selected from coconut coir or jute fibers, providing additional flexibility and toughness to the concrete matrix.

6. The fiber-reinforced concrete composition as claimed in claim 1, wherein the fiber content ranges from 0.5% to 2% by volume of the composition.

7. The fiber-reinforced concrete composition as claimed in claim 1, wherein the microcapsules have a size range of approximately 50 to 200 microns to ensure effective dispersion and rupture upon crack formation (105).

8. The fiber-reinforced concrete composition as claimed in claim 1, further comprising additives selected from plasticizers, accelerators, or retarders to modify the setting time and workability of the concrete mixture.

9. The fiber-reinforced concrete composition as claimed in claim 1, wherein the healing agent is a dual-component system with microcapsules containing both an epoxy resin and a hardener that are released upon crack formation, initiating polymerization to seal the crack.

10. The fiber-reinforced concrete composition as claimed in claim 1, wherein the concrete is particularly suited for infrastructure applications, including bridges, highways, tunnels, and industrial floors, requiring minimal maintenance and enhanced durability.

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