Asphalt Emulsion Break Control Agent for Ambient Mixing
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Solution Overview
Problem
Existing asphaltic or bituminous emulsions used in road construction face issues such as slow breaking characteristics, limited aggregate size, susceptibility to wash-off, slow cure, and poor strength, particularly when used at ambient temperatures and with aggregate gradations outside specified ranges.
Innovation Solution
The use of asphaltic or bituminous emulsions combined with a break control agent (BCA) at ambient or slightly elevated temperatures (up to 160° F to 180° F) to coat aggregates, where the BCA is composed of tall oil amido amine, hydrochloric acid, and de-foaming agents, or phosphated moieties, allowing for controlled break, set, and adhesion, thereby preventing immediate wash-off with water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional asphaltic or bituminous emulsions are used at ambient temperatures, then energy expenditure is reduced, but the emulsion exhibits slow breaking characteristics and susceptibility to wash-off
Solution Approach 1:
A break control agent (BCA) is introduced as an intermediary substance to mediate between the emulsion and aggregate. The BCA accelerates the breaking process and improves wash-off resistance without requiring high temperatures, thus resolving the contradiction between low energy expenditure and reliable performance.
Solution Approach 2:
The invention changes the chemical parameters of the emulsion system by incorporating specific BCA components (such as metal salts, acids, or bases) that modify the emulsion's breaking behavior. This allows the emulsion to break rapidly and adhere properly to aggregates at ambient temperatures, overcoming the limitations of traditional emulsions.
2Adaptability or versatility
If emulsions are used with aggregate sizes outside specified gradations, then application versatility is improved, but the emulsion exhibits poor adhesion and strength
Solution Approach 1:
The break control agent is designed to be universally effective across a wide range of aggregate sizes and types. By adjusting the BCA composition and dosage, the emulsion system can adapt to different aggregate gradations while maintaining consistent adhesion and strength properties, thus achieving multi-functionality.
Solution Approach 2:
The invention introduces dynamic adjustability through the BCA system, allowing the emulsion's breaking and adhesion characteristics to be optimized for different aggregate sizes. The BCA can be tailored in concentration and composition to match specific aggregate gradations, enabling the system to adapt dynamically to various application requirements.
3Strength
If hot mix asphalt is used, then adhesion and strength are improved, but energy expenditure and cost increase significantly
Solution Approach 1:
The invention replaces the thermal-mechanical system (heating to achieve adhesion) with a chemical system (BCA-induced breaking and adhesion). Instead of relying on high temperatures to facilitate emulsion breaking and bonding, the BCA chemically accelerates these processes at ambient temperatures, substituting thermal energy with chemical action.
Solution Approach 2:
The break control agent serves as a chemical mediator that enables adhesion and strength development without requiring high temperatures. The BCA facilitates the interaction between emulsion and aggregate through chemical mechanisms, replacing the need for thermal activation while maintaining or improving bond strength.
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 the creation of a stable asphalt or bituminous coating on aggregates that does not wash off easily with water, improving mixing, setting, and curing times, and expanding the temperature and aggregate gradation limitations of traditional emulsion applications.
Implementation Method 1
a technology known as 'warm mix' has developed. While this warm mix is not mixed, asphalt/bitumen plus aggregates, at as high a temperature as hot mix, neither is below about 160° F. to 180° F. but rather above these temperatures for any or all the various components
Implementation Method 2
The aggregates of the invention do not meet gradations as used in various slurry seal or micro surfacing but rather as commonly used in hot mix or recycling (road or shingle, for example) applications
Data Source
AI summary
Asphaltic or bitumen emulsions designed for road construction applications. Construction of full depth pavements with emulsions and the related process disclosed herein is now possible at temperatures below about 160° F. to 180° F. by the unique and unexpected combination of emulsifier(s), surfactant(s) and optional break control agent(s), to form mixtures of emulsion plus break control agent and aggregates. The mixtures of emulsion plus break control agent and aggregates are then spread across the paving area. The spread mixture then breaks, sets and otherwise cures to a complete mass or mat suitable for the intended design application.