Functionalized Polyamine Clay Mitigation in Construction Aggregates
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Solution Overview
Problem
Clay materials in construction aggregates, such as sand and gravel, absorb water and chemicals, leading to decreased performance of construction materials like concrete and asphalt, and existing methods to mitigate this often remove beneficial fines during washing.
Innovation Solution
A functionalized polyamine is introduced into clay-bearing aggregates, formed by reacting amine compounds with an epoxy compound and functionalizing agents, to mitigate the detrimental effects of clays while maintaining beneficial fines, improving the properties of construction materials and reducing the need for washing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If washing is used to remove clay from aggregates, then clay content is reduced, but beneficial fines are also removed
Solution Approach 1:
A functionalized polyamine is introduced as an intermediary substance that selectively interacts with clay particles. The polyamine contains functional groups that bind to clay minerals, creating a clay-polyamine complex that can be controlled during washing. This mediator allows selective removal of clay while preserving beneficial fines, as the polyamine specifically targets clay rather than non-selectively removing all fine particles.
Solution Approach 2:
The patent modifies the chemical parameters of the aggregate surface by introducing functionalized polyamines. These polyamines change the surface chemistry and charge characteristics of clay particles, making them more susceptible to selective removal during washing. By altering these chemical parameters, the washing process becomes more selective, removing clay while maintaining beneficial fines that do not bind to the polyamine.
2Object-affected harmful factors
If quaternary amine compounds are used to modify clay properties, then clay's adverse effect is minimized, but the complexity of the treatment process increases
Solution Approach 1:
The patent uses functionalized polyamines that modify the chemical parameters of clay particles through specific functional groups. These polyamines change the surface charge, hydrophobicity, and binding characteristics of clay, thereby minimizing their adverse effects on construction materials. The functionalization process creates specific chemical interactions that simplify the overall treatment approach compared to traditional quaternary amine methods.
Solution Approach 2:
The invention employs composite polyamine structures that combine multiple functional groups within a single molecule. These composite polyamines integrate various functional characteristics (binding, steric hindrance, hydrophobicity) into one substance, reducing the need for multiple separate treatment agents and simplifying the overall process while effectively addressing clay's harmful properties.
3Object-affected harmful factors
If washing is performed to remove clay, then clay mitigation is achieved, but water consumption and processing time increase
Solution Approach 1:
The functionalized polyamine is applied to the aggregates before the washing process. This preliminary treatment modifies the clay particle surfaces in advance, making them more susceptible to removal during subsequent washing. By preparing the aggregates beforehand with the polyamine coating, the actual washing process becomes more efficient and requires less time and water, as the modified clay particles are more easily separated from the aggregates.
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 functionalized polyamine enhances the workability and strength of mortars and concretes, improves asphalt flowability, and stabilizes clay in gas and oil well applications, allowing for a higher content of beneficial fines and reduced water absorption, thereby improving overall construction material performance.
Implementation Method 1
a water-soluble functionalized polyamine comprising a water-soluble polyamine formed by reacting at least one of the amine compounds represented by the structural formulae (A) through (C) below with an epoxy compound represented by the structural formula (D) below
Implementation Method 2
Clay materials are often present in construction materials such as concrete, mortar, asphalt, road base, and gas and oil well drilling mud (used for cementing the annulus gap between pipe and well bore) due to their presence in sand, crushed rock or gravel, and other aggregate materials which are typically used in construction applications. Having a lamellar structure, clay can absorb water and chemical agents
Data Source
AI summary
The present invention provides methods and compositions for treating clay-bearing aggregates, particularly those used for construction purposes, whereby inclusion of fines is maximized due to minimization of clay washing which tends to remove such fines, and whereby performance of the aggregate-containing construction material is enhanced. Exemplary methods comprise introducing to clay a water-soluble, functionalized polyamine comprising a water-soluble polyamine formed by reacting an amine compound with an epoxy compound, the polyamine thus reacted being functionalized through the use of certain halide, sulfate, or epoxy compounds.