Mobile Mixing System for Uniform Aggregate Coating
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Solution Overview
Problem
Conventional methods for producing composite materials for construction, such as concrete pavement, face issues with inconsistent and non-uniform coating of aggregates with polymeric binders, leading to reduced working time and efficiency, and increased risk of early material failure due to inconsistent curing processes.
Innovation Solution
A mixing system that includes separate vessels for a two-component polymeric binder composition and an aggregate vessel, where the binder components are mixed and applied uniformly to the aggregate within the mixing apparatus, ensuring consistent coating and improved physical properties like compressive, tensile, and flexural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If aggregate is sprayed with binder composition onsite, then transportation time is reduced, but coating uniformity deteriorates
Solution Approach 1:
A mobile mixing apparatus serves as an intermediary between centralized mixing facilities and onsite application. The apparatus mixes binder and aggregate in a controlled environment mobile enough to reach construction sites, ensuring uniform coating while minimizing transportation time of the final composite material.
Solution Approach 2:
The mixing apparatus controls critical parameters including mixing time, speed, temperature, and binder-to-aggregate ratio to optimize coating uniformity. By precisely controlling these parameters during mixing, the system achieves consistent coating quality even with short transportation times.
2Manufacturing precision
If aggregate and binder are tumbled in batch mixer, then coating uniformity is improved, but working time is reduced
Solution Approach 1:
The mixing apparatus operates continuously rather than in batches, maintaining a steady flow of aggregate through the mixing zone. This continuous operation allows for consistent coating application without the downtime between batches, extending the overall working time while maintaining coating uniformity.
Solution Approach 2:
The binder is pre-heated and prepared in the mixing apparatus before aggregate is introduced. This preliminary preparation ensures optimal binder viscosity and temperature for uniform coating, reducing the time needed for actual mixing and coating operations.
3Manufacturing precision
If batch mixing is used, then coating consistency is improved, but production efficiency deteriorates
Solution Approach 1:
The mixing apparatus features variable speed control and adjustable mixing parameters that can be dynamically optimized for different aggregate sizes, binder types, and production volumes. This dynamic adaptability maintains coating consistency across varying production conditions while maximizing efficiency.
Solution Approach 2:
The mixing process is segmented into distinct zones: binder preparation zone, mixing zone, and discharge zone. This segmentation allows each zone to be optimized independently for its specific function, improving overall production efficiency while maintaining consistent coating quality through specialized processing in each zone.
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 system achieves uniform and consistent coating of aggregates, enhancing the composite material's physical properties and extending working time, allowing for more efficient on-site production of high-quality paved structures.
Implementation Method 1
a reaction product of a two-component polymeric binder composition
Data Source
AI summary
A method produces a composite material using a mixing system. The composite material comprises at least one aggregate, e.g. rock and/or glass, and the reaction product of a two-component polymeric binder composition comprising a first component, e.g. an isocyanate component, and a second component, e.g. an isocyanate-reactive component. The mixing system includes a mixing apparatus. The method includes the step of providing the aggregate, the first component and the second component into the mixing apparatus. The method further includes the step of mixing the first and second components to produce the reaction product of the two-component polymeric binder composition, and the step of applying the reaction product of the two-component polymeric binder composition to the aggregate within the mixing apparatus to produce the composite material. The composite material can be used for forming a paved structure, such as a sidewalk or a roadway.