Encapsulated Bacterial Healing Agents for Self-Healing Concrete
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Solution Overview
Problem
Existing self-healing concrete technologies face challenges in incorporating sufficient healing agents without compromising the workability and strength of the concrete mixture, limiting their application to high-strength constructions due to the volume requirements of healing agents, which often result in reduced concrete durability and structural integrity.
Innovation Solution
The development of leakage-proof tablets containing a particulate healing agent comprising bacterial material and additives, coated to protect during concrete production, which break and release the healing agent upon crack formation, allowing for higher quantities of healing agents to be used without affecting the concrete's workability or strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher quantities of healing agents are incorporated into concrete, then healing capacity is improved, but workability and strength of the concrete mixture deteriorate
Solution Approach 1:
The healing agent is segmented into encapsulated particles distributed throughout the concrete matrix. Each particle contains a small amount of healing agent (bacteria and nutrients) in a protected capsule, allowing many such particles to be distributed without the negative effects of bulk healing agent addition. This segmentation enables high healing capacity while maintaining concrete workability and strength.
Solution Approach 2:
The healing agent is enclosed in flexible capsule shells that protect the contents during concrete mixing and placement. These thin film encapsulations allow the healing agent to be incorporated in high quantities without affecting concrete properties, as the capsules maintain integrity during mixing but can rupture when needed to release the healing agent at crack sites.
2Reliability
If higher quantities of healing agents are incorporated into concrete, then healing capacity is improved, but workability of the concrete mixture deteriorates
Solution Approach 1:
The healing agent is divided into numerous small encapsulated particles that can be uniformly distributed throughout the concrete mixture. This segmentation prevents the healing agent from interfering with concrete workability, as the small encapsulated particles do not disrupt mixing, pumping, or placement operations, yet provide substantial healing capacity when distributed throughout the structure.
Solution Approach 2:
The flexible capsule shells enclose the healing agent in a form that does not interfere with concrete workability. The capsules remain intact during mixing and placement, allowing high quantities of healing agent to be incorporated without affecting the fluidity, pumpability, or finishability of the fresh concrete mixture.
3Reliability
If encapsulation material is used to protect healing agent during production, then protection is improved, but cost and manufacturing complexity increase
Solution Approach 1:
The encapsulation material parameters are optimized to provide adequate protection during concrete production while maintaining cost-effectiveness. The capsule shells are designed with appropriate thickness, strength, and chemical resistance to protect the healing agent during mixing and placement, but without excessive complexity or cost. Simple single-layer or multi-layer polymer capsules provide sufficient protection for most applications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables improved healing capacity and enhanced workability and strength of concrete, allowing for the use of self-healing concrete in structural applications that require high strength, while being technically easier and more cost-effective than previous methods.
Implementation Method 1
bacteria can produce that by metabolic conversion of a suitable organic component. The nature of metabolically produced filler material could be bio-minerals such as calcite.
Implementation Method 2
leakage-proof tablets containing the actual healing agent, coated to protect during concrete production
Implementation Method 3
which break and release the healing agent upon crack formation
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The invention provides a process for the production of a cementious material. The process comprises mixing cement starting materials and a particulate healing agent to provide the cementious material. The healing agent comprises coated particles, wherein the coated particles comprise bacterial material and additive. The bacterial material is selected from the group consisting of a bacterium, a lyophilized bacterium and a bacterial spore of a bacterium. The present invention solves these problems, as (substantially leakage-proof) tablets containing the actual healing agent may neither interfere with either the workability of the liquid mixture ("cementious material") nor negatively affect properties of either mixture or final material (hardened concrete), even when applied in large quantities. During crack formation in cementious based constructions, the particles also crack, and healing agent is released.