Asphalt Tack Coat Composition for Rapid Tracking Resistance
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Solution Overview
Problem
Existing asphalt tack coats fail to provide adequate tracking resistance, leading to premature deterioration of pavement structures and safety hazards due to adhesion issues with construction vehicles, resulting in costly repairs and disruptions.
Innovation Solution
Asphalt compositions comprising carboxylated copolymers, polyalkyleneimines, and photoinitiators, which are blended with asphalt to create tack coats that quickly become trackless, ensuring efficient bonding between pavement layers without adhering to vehicle tires, thus preventing tracking and enhancing construction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tack coat is made soft enough to provide adequate bonding between asphalt layers, then adhesion between pavement layers is improved, but tracking resistance deteriorates and the tack coat adheres to vehicle tires
Solution Approach 1:
The patent changes the chemical composition parameters of the tack coat by incorporating carboxylated styrene-butadiene copolymer latex and polyalkyleneimine in specific proportions. This chemical modification allows the tack coat to achieve both high adhesion strength and rapid tracking resistance without adhering to tires, resolving the contradiction between bonding strength and tracking resistance.
Solution Approach 2:
The patent creates a composite tack coat formulation by combining asphalt with carboxylated styrene-butadiene copolymer latex and polyalkyleneimine. This composite material integrates the adhesive properties of the polymer with the binding properties of asphalt, achieving both strong layer bonding and rapid drying to prevent tracking.
2Object-generated harmful factors
If the tack coat is made hard enough to resist tracking by construction vehicles, then tracking resistance is improved, but bonding ability between asphalt layers deteriorates
Solution Approach 1:
The patent modifies the physical and chemical parameters of the tack coat through controlled composition ratios of carboxylated copolymer (0.1-5% by weight) and polyalkyleneimine (0.01-1% by weight). These parameter changes enable the tack coat to harden rapidly for tracking resistance while maintaining sufficient bonding strength through the chemical composition design.
3Strength
If traditional asphalt tack coats are used to ensure adequate bonding, then adhesion between layers is improved, but construction time increases due to delayed tracking resistance
Solution Approach 1:
The patent incorporates polyalkyleneimine as a preliminary action component that accelerates the drying and hardening process of the tack coat. This preliminary chemical action reduces the waiting time before the next asphalt layer can be applied, thereby reducing construction time while maintaining adequate bonding strength.
Solution Approach 2:
The patent changes the evaporation and drying parameters of the tack coat through the addition of carboxylated copolymer and polyalkyleneimine. These compositional changes accelerate the transition from soft adhesive state to hard tracking-resistant state, reducing construction time while preserving bonding capability.
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 described asphalt compositions enable rapid tack coat drying and adhesion, reducing the risk of pavement defects, enhancing safety, and minimizing construction delays and costs by ensuring effective bonding between asphalt layers while preventing tire pick-up and tracking.
Implementation Method 1
the carboxylated copolymer and the polyalkyleneimine are present in a weight ratio of from 1:10 to 1:0.1, such as from 1:5 to 1:0.5, from 1:5 to 1:1, or from 1:1 to 1:5
Implementation Method 2
asphalt compositions comprising asphalt, a carboxylated copolymer, a polyalkyleneimine, and optionally, a photoinitiator
Data Source
AI summary
Provided herein are asphalt compositions comprising asphalt, a carboxylated copolymer, a polyalkyleneimine, and a photoinitiator. The carboxylated copolymer present in the asphalt compositions can be a latex composition derived from a carboxylated styrene-butadiene copolymer. The carboxylated copolymer includes from 0.5% to 25% by weight carboxylic acid monomers. The carboxylated styrene-butadiene polymer and the asphalt can be present in a weight ratio of from 1:99 to 1:10. The polyalkyleneimine present in the asphalt compositions can be in an amount of greater than 0% to up to 10% by weight of the asphalt composition. The photoinitiator can include benzophenone and/or a derivative thereof. Tack coats meeting ASTM-D-977 standard comprising the asphalt compositions disclosed herein are also provided. The tack coat can have a tack-free time of 10 minutes or less. Methods of producing the asphalt compositions and tack coats are also disclosed.