Pavement Sample Roller Testing Under Controlled Climate Loading
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Solution Overview
Problem
Existing methods for testing pavement materials, such as asphalt, in outdoor environments face challenges due to uncontrolled environmental conditions, varying traffic loads, and the need for large test areas, making it difficult to achieve consistent and controlled results.
Innovation Solution
A machine with a base, paving sample tray, and roller system that applies compressive forces to the sample while allowing for controlled environmental conditions, including temperature and humidity, using a water bath and a computer-controlled system to measure and adjust the testing parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If outdoor testing with motor vehicles is used, then large area pavement can be tested, but environmental conditions cannot be controlled and test consistency deteriorates
Solution Approach 1:
The patent creates a scaled-down复制 version of the outdoor testing scenario by placing a small roller on a laboratory pavement sample. Instead of testing large areas outdoors, the invention copies the essential testing mechanism (roller on pavement) and applies it to small samples in a controlled laboratory environment, thereby maintaining test relevance while achieving environmental control
Solution Approach 2:
The patent changes the scale parameter from large-area outdoor testing to small-sample laboratory testing. By reducing the size of the test subject from full-scale pavement sections to laboratory samples and adjusting the roller dimensions accordingly, the invention enables controlled environmental testing while preserving the fundamental testing mechanism
2Reliability
If controlled laboratory environment is used, then test consistency improves, but device complexity increases
Solution Approach 1:
The patent divides the testing system into simple, discrete components: a roller, a tray for holding the sample, and a lifting mechanism. Each component performs a single, well-defined function, avoiding unnecessary complexity while achieving controlled laboratory testing
Solution Approach 2:
The lifting mechanism is designed to automatically lift the roller when the pavement sample breaks or deforms during testing. This self-actuating feature eliminates the need for complex monitoring and manual intervention systems, maintaining simplicity while ensuring test continuity
3Device complexity
If sample tray is fixed, then structure is simple, but sample access and roller positioning becomes difficult
Solution Approach 1:
The patent makes the tray dynamic by enabling it to be raised and lowered. This allows the tray to be in a lowered position during testing (simple structure) and raised position during sample loading/unloading (easy operation), combining structural simplicity with operational ease through positional flexibility
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
Enables precise and consistent testing of pavement samples under controlled conditions, improving the assessment of material durability and performance by simulating various environmental and loading conditions.
Implementation Method 1
a roller (202) configured for translation relative to the paving sample tray and configured to impart compressive forces to a sample carried by the sample tray
Implementation Method 2
A hot water bath can also be applied to the sample(s) in order to accelerate the effects of moisture and humidity thereon
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
An apparatus for testing paving samples includes a base that includes a paving sample tray about the cabinet and configured for translation relative to the cabinet. A roller is configured for imparting compressive forces to a sample carried by the sample tray. An arm is configured for moving the roller from a stowed position to an in-use position where the roller contacts the sample. A cylinder assembly having a piston therein supplies pressure forces to the arm to move the arm from the stowed position to the in-use position, wherein a depth of travel of the arm is limited by the sample. As the sample is compressed, the depth of travel increases. A measurement device is in communication with the cylinder for determining an amount of travel of the arm to thus determine an amount of compression of the sample.