Bitumen Composition with Wax Mixture for Asphalt Processing
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Solution Overview
Problem
Current bitumen compositions face challenges in processing parameters during asphalt production, such as high compaction temperatures and limited recycled asphalt content, while maintaining the physical properties of the final product, particularly avoiding increased stiffness and low-temperature brittleness.
Innovation Solution
A bitumen composition comprising a wax mixture of 20 to 80 wt.% petroleum slack wax and 20 to 80 wt.% Fischer-Tropsch wax, which improves processability and allows for increased recycled asphalt content without negatively impacting the physical properties of the asphalt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If Fischer-Tropsch wax is used to reduce bitumen viscosity and improve processability, then compaction temperature is reduced, but stiffness and low-temperature brittleness increase
Solution Approach 1:
The patent applies composite materials by combining Fischer-Tropsch wax (synthetic paraffin wax) with petroleum slack wax in a mixture containing 5-50 wt% FTW and 50-95 wt% petroleum slack wax. This composite wax mixture reduces the negative effects of pure FTW on bitumen's physical properties while maintaining the viscosity-reducing and compaction-improving benefits. The petroleum slack wax acts as a balancing component that prevents excessive stiffness and brittleness.
Solution Approach 2:
The patent changes the compositional parameters of the wax mixture by controlling the ratio of FTW to petroleum slack wax within specific ranges (5-50 wt% FTW). It also controls the total wax content in the bitumen composition (0.1-5 wt%) to achieve optimal balance between processability improvement and physical property maintenance. These parameter adjustments resolve the contradiction between reduced compaction temperature and maintained strength.
2Productivity
If recycled asphalt pavement (RAP) is added using cold addition technique, then production cost is reduced and sustainability improved, but the percentage of RAP that can be added is limited to 20-30 wt.-%
Solution Approach 1:
The patent uses the composite wax mixture as an intermediary substance that facilitates the integration of RAP into the asphalt mix. The wax acts as a lubricant and binder that helps incorporate recycled asphalt particles into the fresh mix, improving workability and reducing segregation. This allows higher RAP content (beyond the conventional 20-30 wt% limit) while maintaining mix quality consistency.
Solution Approach 2:
The patent changes the chemical composition parameters of the bitumen binder by adding the specific wax mixture, which modifies the binder's rheological properties. This enables the system to accommodate higher proportions of RAP material while maintaining adequate binding performance and mix consistency, thereby increasing productivity without sacrificing reliability.
3Ease of operation
If bitumen viscosity is reduced for easier processing, then mixing and compaction become easier, but the binding strength and durability of the asphalt decrease
Solution Approach 1:
The patent changes the physical parameters of the bitumen by adding controlled amounts (0.1-5 wt%) of the composite wax mixture. This reduces viscosity and improves ease of mixing and compaction at processing temperatures. However, the specific composition of the wax mixture (combining FTW and petroleum slack wax in controlled ratios) ensures that the binding strength and durability are maintained by preventing excessive softening and maintaining appropriate adhesive properties.
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 wax mixture reduces asphalt compaction temperatures, enhances low-temperature performance, and increases the percentage of recycled asphalt that can be processed using the cold addition technique, resulting in durable and long-lasting asphalt with improved compaction resistance and aging resistance.
Implementation Method 1
improves processability and allows for increased recycled asphalt content without negatively impacting the physical properties of the asphalt
Implementation Method 2
reduces asphalt compaction temperatures
Implementation Method 3
enhances low-temperature performance
Data Source
AI summary
The present invention relates to a bitumen composition comprising a petroleum slack wax and a Fischer-Tropsch wax, the use of the waxes in bitumen compositions, the use of the bitumen composition in asphalt compositions, asphalt compositions comprising the bitumen composition and a method for producing asphalt pavements and constructions thereof. The bitumen has proved to have better processing characteristics.