In-Line Mixer Asphalt Modification Oxidation Control
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Solution Overview
Problem
Conventional air-blowing methods for asphalt materials negatively impact fatigue resistance and low-temperature properties, and existing methods for manufacturing modified asphalts on an industrial scale are inefficient due to high power consumption.
Innovation Solution
The use of an in-line mixer equipped with a rotor-stator mixing tool that applies high shear and allows an oxygen-containing gas to be blown through the asphalt at elevated temperatures, with controlled flow rates to optimize power usage and achieve improved rutting and fatigue resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional air-blowing is used to modify asphalt, then rutting resistance is improved, but fatigue resistance and low temperature properties deteriorate
Solution Approach 1:
The patent changes the oxidation parameters by controlling oxygen concentration, temperature, and shear rate to achieve selective modification. By adjusting these parameters, the asphalt undergoes controlled oxidation that improves rutting resistance while preserving fatigue resistance, resolving the contradiction between these two properties
Solution Approach 2:
The patent uses accelerated oxidation through controlled oxygen blowing at elevated temperatures with high shear rates. This strong oxidation process modifies the asphalt molecules in a way that simultaneously improves both rutting resistance and fatigue resistance, overturning the conventional wisdom that oxidation always degrades fatigue resistance
2Productivity
If in-line mixer is used for large scale asphalt mixing, then mixing efficiency is improved, but power consumption increases
Solution Approach 1:
The patent optimizes the power consumption by adjusting operational parameters including gas flow rate, asphalt flow rate, and temperature. By controlling these parameters, the in-line mixer operates at optimal efficiency points, achieving high mixing efficiency while minimizing power consumption
Solution Approach 2:
The patent implements continuous mixing operation where asphalt continuously flows through the in-line mixer while oxygen is continuously blown through the material. This continuous action maintains optimal mixing conditions and power utilization, avoiding the energy waste associated with batch processing and idle periods
3Manufacturing precision
If high gas flow rate is used through the mixer, then oxidation effectiveness is improved, but power consumption increases
Solution Approach 1:
The patent optimizes the gas flow rate parameter to achieve the minimum effective oxidation while minimizing power consumption. By carefully controlling the oxygen flow rate alongside temperature and shear rate, the system achieves sufficient oxidation effectiveness without excessive energy input
Solution Approach 2:
The patent employs feedback control mechanisms to monitor oxidation progress and adjust gas flow rate accordingly. This feedback system ensures that only the necessary amount of oxygen is supplied to achieve the desired oxidation level, preventing energy waste from excessive gas flow
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 method significantly improves both rutting resistance and fatigue resistance of modified asphalts while reducing energy costs by operating the in-line mixer at 60-95% of its maximum power rating, enhancing manufacturing efficiency.
Implementation Method 1
The rotor-stator mixing tool applies high levels of shear to the base asphalt
Implementation Method 2
passing an oxidizing gas through the asphalt in a molten condition... the effect of such conventional air-blowing is to partially oxidize the asphalt
Implementation Method 3
flowing the base asphalt through the in-line mixer at an elevated temperature
Data Source
AI summary
Methods and systems for efficiently manufacturing modified asphalt materials include agitating a base asphalt at a high shear rate using an in-line mixer while simultaneously exposing the asphalt to oxygen by blowing an oxygen-containing gas at a high gas flow rate through openings in the in-line mixer and heating the asphalt at an elevated temperature.