Erosion Resistant Barrier Cap Material with Varying Permeabilities
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Solution Overview
Problem
Existing materials for reducing erosion and sediment contamination in water bodies are often geotechnically unstable, inadequate for sustaining aquatic life, or too expensive and labor-intensive, and remedial dredging alone is insufficient in addressing the issue of contaminated sediments and erosion.
Innovation Solution
A barrier cap material composed of a blend of aggregate particles and manufactured composite particles with a hydratable sealant material, which can control segregation and permeability to create a geotechnically stable, erosion-resistant layer that is cost-effective and suitable for aquatic environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If remedial dredging is used to remove contaminated sediments, then the contaminated sediments are removed from the water body, but the bottom contour and sediment stability are altered, and habitat suitability is reduced
Solution Approach 1:
The patent applies capping material immediately after dredging to restore sediment stability and protect the newly exposed substrate. The capping layer is placed as a preliminary protective measure before the system can be left to stabilize naturally, preventing erosion and habitat degradation that would occur if the disturbed sediment were left exposed.
Solution Approach 2:
The patent changes the physical and chemical parameters of the sediment surface by introducing capping material with specific grain size distributions, organic matter content, and structural properties. This transforms the unstable, disturbed dredged surface into a stable, habitat-appropriate substrate that mimics natural sediment conditions.
2Volume of stationary object
If sand or stone is used as replacement sediment, then the volume loss from dredging is compensated, but the materials are not geotechnically stable and result in increased erosion
Solution Approach 1:
The patent uses composite capping material that combines inorganic aggregate with organic matter and binding agents. This composite structure provides both volume replacement and geotechnical stability, as the combination of materials creates a more cohesive and erosion-resistant substrate compared to using sand or stone alone.
Solution Approach 2:
The patent tailors the properties of the capping material to match the specific requirements of the dredged site. The aggregate size distribution, organic matter content, and structural characteristics are locally optimized to provide appropriate geotechnical stability and erosion resistance for each specific application location.
3Object-affected harmful factors
If conventional erosion prevention systems are implemented, then erosion control is achieved, but the systems are too expensive and labor intensive to implement
Solution Approach 1:
The patent employs capping material that can be applied using simplified, less labor-intensive methods compared to conventional erosion prevention systems. The material is designed to be easily placed and distributed, reducing the need for complex installation equipment and extensive labor, thereby lowering implementation costs while still achieving effective erosion control.
4Stability of the object's composition
If a uniform blend of aggregate and composite particles is used, then the material composition is consistent, but segregation occurs when dropped through a water column
Solution Approach 1:
The patent intentionally creates a non-uniform, stratified structure in the capping material where different particle sizes and types are distributed in specific layers. The coarser aggregate forms the lower layer for structural stability, while finer composite particles form the upper layer for erosion resistance. This local differentiation prevents segregation during water column transport while maintaining overall composition consistency.
Solution Approach 2:
The patent uses asymmetric particle size distribution and density variation within the capping material blend. The deliberate asymmetry in particle characteristics ensures that during transport through the water column, particles settle in a controlled manner that maintains the desired layered structure rather than causing random segregation.
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
The barrier cap material effectively reduces erosion and sediment contamination by forming a stable, impermeable layer that prevents contaminants from entering the water column, while being economically efficient and suitable for various applications, including post-dredging sediment replacement and erosion control.
Implementation Method 1
a plurality of manufactured composite particles including a hydratable sealant material
Implementation Method 2
When the particles are hydrated they replace lost volume and habitat with a geotechnically stable erosion resistant layer
Implementation Method 3
the permeability of the barrier cap material, when hydrated on a surface, can be controlled from 1×10−3 cm/sec to 1×10−8 cm/sec
Data Source
AI summary
The invention relates to a barrier cap material including a blend of: a plurality of aggregate particles, and a plurality of manufactured composite particles including a hydratable sealant material. In a particular embodiment, the segregation of a blend of aggregate particles and composite particles, when dropped through a water column can be controlled by varying blends of aggregate and composite particles. In another embodiment, the permeability of the barrier cap material, when hydrated on a surface, can be controlled from 1×10−3 cm/sec to 1×10−8 cm/sec by varying blends of aggregate and composite particles.