Pavement Sample Roller Testing Under Controlled Load and Climate
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Solution Overview
Problem
Current methods for testing asphalt and other paving materials face challenges in achieving consistent results due to uncontrolled environmental conditions and the inability to simulate real-world traffic loads in outdoor testing, leading to inconsistent durability assessments.
Innovation Solution
A machine and method for testing paving samples that applies controlled rolling pressure and temperature/humidity conditions, utilizing a cylinder assembly with integrated measurement devices to measure compression and adjust movement profiles, allowing for precise deformation testing in a controlled laboratory environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If outdoor testing with motor vehicles is used, then real-world traffic loads can be applied, but environmental conditions cannot be controlled leading to inconsistent results
Solution Approach 1:
The patent introduces a laboratory testing machine as an intermediary device that simulates real-world traffic loads through controlled roller mechanisms. This intermediary system allows the application of standardized wheel loads and repetitions in a controlled environment, eliminating the harmful effect of uncontrolled outdoor conditions while maintaining the essential testing function.
Solution Approach 2:
The patent creates a simplified copy of real-world traffic conditions using laboratory equipment. The roller mechanism replicates the essential loading pattern of vehicle wheels on pavement, and the environmental chamber copies controlled temperature and humidity conditions. This copying approach enables consistent testing without requiring actual outdoor traffic exposure.
2Object-affected harmful factors
If controlled laboratory environment is used, then environmental conditions can be controlled, but real-world traffic loads cannot be simulated
Solution Approach 1:
The patent utilizes parameter changes to simulate different traffic loading conditions. The roller mechanism allows adjustment of load magnitude, contact area, and number of repetitions to represent various vehicle types and traffic patterns. The environmental chamber parameters (temperature, humidity) can also be adjusted to simulate different climatic conditions, providing versatility within the controlled laboratory setting.
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 consistent and precise testing of paving materials under controlled conditions, simulating real-world loads and environmental factors, thereby improving the assessment of material durability and performance.
Implementation Method 1
a cylinder assembly having a piston therein for supplying pressure forces to the arm to move the arm from the stowed position to the in-use position
Implementation Method 2
a roller configured for imparting compressive forces to a sample carried by the sample tray
Data Source
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.