Nonvolatile Cold Asphalt Binder with Polymer Modifiers
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Solution Overview
Problem
Conventional cold asphalt binders and mixtures face issues with mechanical properties, storage stability, long-term storage, and usability in rainy or winter conditions due to volatile solvents and temperature sensitivity.
Innovation Solution
A nonvolatile cold modified asphalt binder is developed by mixing petroleum asphalt, native asphalt, a rubber-modified-compound polymer modifier, process oil, and an adhesive strength enhancer, excluding volatile solvents to maintain ductility and improve mechanical properties, ensuring stability and usability across various weather conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cutback asphalt containing volatile solvent is used as binder, then the asphalt can be used at room temperature, but the mechanical properties are reduced and storage stability is poor due to solvent vaporization
Solution Approach 1:
The patent removes volatile solvents from the binder composition entirely, replacing them with non-volatile process oils. This extraction of the harmful volatile component eliminates the source of mechanical property degradation while maintaining the ability to use the binder at room temperature through alternative chemistry.
Solution Approach 2:
The patent changes the chemical parameters of the binder by substituting volatile petroleum solvents with non-volatile process oils and incorporating polymer modifiers. This parameter change transforms the binder from one that degrades through solvent evaporation to one that maintains stable mechanical properties over time.
2Ease of operation
If emulsified asphalt is used as binder, then the asphalt remains liquid at room temperature, but the physical properties are lowered compared to straight asphalt
Solution Approach 1:
The patent creates a composite binder system combining process oils with polymer modifiers (such as SBS, SIS, or SEBS). This composite approach achieves the liquid state at room temperature through the oil component while the polymer component provides the enhanced physical properties, eliminating the need for water-based emulsification.
3Strength
If inorganic binder is used to improve strength, then the strength properties are improved, but the asphalt becomes vulnerable to fatigue and low-temperature cracking
Solution Approach 1:
The patent changes the binder composition parameters by using organic polymer modifiers instead of inorganic binders. The polymer modifiers provide both strength enhancement and maintain the ductility and fatigue resistance characteristic of organic asphalt systems, avoiding the brittleness introduced by inorganic additives.
4Strength
If polymer-based binder is used, then the mechanical properties are improved, but the storage stability is poor due to high tackiness and moisture sensitivity
Solution Approach 1:
The patent uses process oils as an intermediary substance that controls the interaction between polymer modifiers and the asphalt matrix. The process oil acts as a dispersant and stability agent, preventing premature polymer coagulation and moisture-related degradation while maintaining the mechanical property enhancements provided by the polymers.
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 nonvolatile cold recycled asphalt mixture exhibits excellent mechanical properties, stability, and adhesion, with a storage period of at least two years, and can be used in high humidity or moisture states, including winter conditions.
Implementation Method 1
a rubber-modified-compound polymer modifier which is a vinyl aromatic hydrocarbon-conjugated diene block copolymer including at least one of a styrene-butadiene block copolymer (SBS), a styrene-isoprene block copolymer (SIS), and a styrene-ethylene-butylene block copolymer (SEBS)
Implementation Method 2
an adhesive strength enhancer
Data Source
AI summary
A nonvolatile cold modified asphalt binder and a nonvolatile cold recycled asphalt mixture using the same are manufactured by optimally mixing a petroleum asphalt, a native asphalt, a polymer modifier, process oil, and an adhesive strength enhancer. The nonvolatile cold modified asphalt binder includes at least one petroleum asphalt selected from a straight asphalt or a blown asphalt; at least one native asphalt selected from gilsonite, glance pitch, and grahamite; a rubber-modified-compound (RMC) polymer modifier which is a vinyl aromatic hydrocarbon-conjugated diene block copolymer including at least one of a styrene-butadiene block copolymer (SBS), a styrene-isoprene block copolymer (SIS), and a styrene-ethylene-butylene block copolymer (SEBS); at least one process oil selected from paraffin oil, naphthenic oil, aromatic oil, natural oil, and mineral oil; and at least one adhesive strength enhancer selected from rosin esters, modified acryls, modified silicones, polyvinyl esters, and silicone resins.