Bitumen Additive Using Wax Dispersion for Low-Temperature Foaming
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Solution Overview
Problem
Current bitumen foaming methods reduce asphalt quality and require high temperatures for road paving, leading to energy inefficiency and environmental concerns, while existing additives either compromise asphalt quality or require significant equipment changes.
Innovation Solution
A bitumen additive comprising a Fischer-Tropsch wax and petroleum slack wax dispersed in water with an emulsifier, which is added to bitumen to produce a foamed bitumen at lower temperatures, maintaining asphalt quality and enabling warm mix asphalt production without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bitumen foaming methods are used, then bitumen can be foamed, but asphalt quality is reduced and high temperatures are required
Solution Approach 1:
The patent introduces a water-based wax dispersion as an intermediary substance to enable foaming at lower temperatures. The dispersion contains emulsifiers that mediate between water and bitumen, allowing stable foam formation without requiring high temperatures, thus resolving the contradiction between maintaining asphalt quality and reducing bitumen temperature
Solution Approach 2:
The invention changes the chemical composition parameters of the foaming agent from pure water to a water-based dispersion containing specific waxes and emulsifiers. This parameter change enables foam stabilization at lower temperatures, allowing bitumen to be foamed at temperatures that preserve asphalt quality while reducing energy consumption
2Ease of operation
If high temperatures are used for road paving, then bitumen workability is improved, but energy consumption increases and environmental impact worsens
Solution Approach 1:
The patent utilizes phase transition of water to steam during foaming, but occurs at lower temperatures due to the presence of the wax dispersion. This controlled phase transition provides sufficient bitumen workability without requiring high temperatures, thereby reducing energy consumption and environmental impact while maintaining operational ease
3Temperature
If existing additives are used to reduce temperature, then bitumen temperature can be lowered, but asphalt quality is compromised or equipment changes are required
Solution Approach 1:
The invention employs a composite water-based dispersion containing multiple components (waxes, emulsifiers, and other additives) that work synergistically. This composite formulation reduces bitumen temperature while maintaining asphalt quality, overcoming the limitations of single-component additives that either compromise quality or require equipment modifications
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 bitumen additive allows for reduced bitumen temperatures during road paving, enhancing workability and cracking resistance, while minimizing energy consumption and environmental impact without compromising asphalt quality or requiring extensive equipment modifications.
Implementation Method 1
a wax dispersed in water, the water being in the continuous phase and the wax being, at room temperature, in the dispersed phase; and an emulsifier
Implementation Method 2
adding the bitumen additive to hot bitumen causes foaming of the bitumen. The bitumen can expand by 20 to 30 times its original volume
Implementation Method 3
When injected into the hot bitumen the water evaporates abruptly, causing foaming of the bitumen in a saturated steam atmosphere
Data Source
AI summary
The invention relates to a bitumen additive comprising a wax dispersed in water, the water being in the continuous phase and the wax in the dispersed phase; the wax comprising a Fischer-Tropsch wax and one or more hydrocarbon waxes selected from the group comprising petroleum-based waxes, polyolefin waxes, or mixtures thereof; and an emulsifier. The invention extends to a method to produce a foamed bitumen composition by adding a bitumen additive to a bitumen feedstock in a bitumen foaming device to produce the foamed bitumen, and to a method to produce an asphalt mix by adding a bitumen feedstock and a bitumen additive to an aggregate in an asphalt mixer to produce the asphalt mix.