In-Line Asphalt Cement Heating for Long-Range Cold Recycling
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Solution Overview
Problem
The CIR process faces challenges due to the loss of heat in asphalt cement carried by supply trucks, leading to substandard quality repairs when the temperature falls below 290°-300°F, especially when operations are prolonged or conducted at a distance from the asphalt supply terminal.
Innovation Solution
A method and apparatus that includes a heater integrated into the CIR train to continuously heat the asphalt cement as it is withdrawn from the supply tank, maintaining it within the optimal temperature range for effective use in the CIR process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If asphalt cement is transported over long distances or for prolonged periods, then the supply range and operational flexibility are improved, but the temperature of the asphalt cement decreases leading to substandard quality
Solution Approach 1:
The heater is activated before the asphalt cement temperature drops below the optimal range, maintaining temperature proactively during transport and operation. This preliminary heating action prevents temperature loss rather than correcting it after the fact, ensuring consistent quality regardless of transport distance or duration.
Solution Approach 2:
The heater provides continuous heating throughout the transport and operation process, maintaining asphalt cement temperature consistently within the optimal 290-300°F range. This continuous thermal maintenance eliminates temperature fluctuations that would otherwise occur during prolonged transport or stationary periods, enabling extended operational range without quality compromise.
2Temperature
If the heater is activated continuously, then the asphalt cement temperature is maintained within optimal range, but the energy consumption increases
Solution Approach 1:
The temperature sensor continuously monitors asphalt cement temperature and provides feedback to the heater control system. Based on this feedback, the heater is activated only when temperature drops below the optimal 290-300°F range, rather than running continuously. This closed-loop control maintains temperature consistency while minimizing unnecessary energy consumption during periods when temperature is already adequate.
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
Ensures the CIR process can proceed without concerns about asphalt cement heat loss, maintaining the quality of the repaired roadway by keeping the asphalt cement within the desired temperature range, thereby ensuring a consistent and high-quality repair.
Implementation Method 1
A use of heater for asphalt cement that is carried in a supply tank... the heater is adapted to heat the asphalt cement continuously as it is withdrawn from the supply tank
Data Source
AI summary
A CIR train that is adapted to traverse a roadway of asphalt pavement in order to recycle and repair the asphalt pavement includes a milling machine for removing asphalt paving material from the roadway. The CIR train also includes an asphalt cement supply tank and a mechanism for dispensing asphalt cement onto asphalt paving material that has been removed from the roadway. A heater is in fluid communication with the asphalt cement supply tank and the mechanism for dispensing asphalt cement on the asphalt paving material that has been removed from the roadway. The heater is adapted to heat the asphalt cement from the asphalt cement supply tank prior to said asphalt cement being dispensed on the asphalt paving material that has been removed from the roadway.