Joint Sand Composition Erosion Resistance
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Solution Overview
Problem
Existing joint sand compositions are prone to erosion by rainwater, exhibit poor self-healing properties, and suffer from unsightly peels, crumbling texture, and micro cracks, leading to reduced flexibility and structural integrity over time, while also being dusty and inhomogeneous due to fine particle sizes and separation during transport.
Innovation Solution
A joint sand composition comprising sand, a water-soluble polymer, and an organic hydrocolloid, which provides enhanced resistance to water erosion, forms a flexible 'putty-like' material that allows water to pass through, and returns to a dry coherent form, maintaining stability and flexibility, and includes a liquid with lower vapor pressure to prevent dust and particle separation, along with optional cement for improved bonding and structural rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If joint sand contains additives to reduce erosion, then erosion resistance is improved, but the composition requires curing time and may exhibit peeling and crumbling
Solution Approach 1:
The patent changes the physical-chemical parameters of the joint sand composition by incorporating specific additives (polymer, hydrocolloid, surfactant) that modify the sand's interaction with water. These additives change the composition's rheological properties and surface tension, enabling it to resist erosion without requiring extended curing periods while preventing peeling and crumbling surface defects.
Solution Approach 2:
The patent creates a composite material system combining sand particles with various additives including polymers, hydrocolloids, and surfactants. This composite structure provides multiple functions simultaneously: the polymer and hydrocolloid form a binding matrix that reduces erosion, while the surfactant controls water distribution, eliminating the need for prolonged curing and preventing surface degradation.
2Ease of operation
If joint sand uses fine particle sizes to improve filling, then joint filling is improved, but dust generation and particle separation during transport increase
Solution Approach 1:
The patent modifies the particle size distribution parameters and surface properties of the sand by incorporating surfactants and binding agents. These additives change the surface tension and cohesion of fine particles, reducing dust generation during handling while preventing particle separation during transport through enhanced inter-particle adhesion, all while maintaining effective joint filling capability.
Solution Approach 2:
The patent introduces surfactants and binding agents as intermediary substances that mediate between the sand particles and the environment. These intermediaries reduce dust by coating particle surfaces, prevent particle separation during transport through enhanced cohesion, and maintain the fine particle sizes needed for effective joint filling without the harmful effects of dust and 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 composition significantly reduces erosion, maintains surface stability, prevents weed growth, and ensures complete curing depth, while being less prone to peeling and cracking, offering improved flexibility and structural integrity, and reduces dust-related issues during transport and use.
Implementation Method 1
the composition will absorb water to form a flexible 'putty-like' material yet still allow surplus water to pass to the sub-base
Implementation Method 2
includes a liquid with lower vapor pressure to prevent dust and particle separation
Implementation Method 3
The combination of the water-soluble polymer and the organic hydrocolloid provides enhanced resistance to water erosion immediately after installation and once the composition has been allowed to cure
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
A joint sand composition which comprises sand, a water-soluble polymer and an organic hydrocolloid. The joint sand is for filling gaps between pavers and provides a flexible composition when wet, which is resistant to rain erosion.