Pavement Sample Roller Compression Testing Under Controlled Conditions
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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 consistent and controlled testing impossible.
Innovation Solution
A machine and method for testing pavement samples that includes a base with a sample tray, a roller for applying compressive forces, a cylinder assembly for controlled movement, and a measurement device to determine compression depth, allowing for precise measurement and controlled environmental conditions like temperature and humidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If outdoor environment testing with motor vehicles is used, then real-world traffic conditions are simulated, but environmental control and test consistency are lost
Solution Approach 1:
The patent segments the testing process by separating the pavement sample testing from actual traffic environments. Instead of testing full-scale pavement under real traffic, the invention uses scaled-down laboratory samples subjected to controlled simulated loading cycles, achieving both practicality and consistency.
Solution Approach 2:
The patent introduces an intermediary testing system that bridges the gap between laboratory conditions and real-world traffic. The testing machine uses a roller assembly that simulates vehicle wheel loads, acting as an intermediary between controlled lab environments and uncontrolled outdoor traffic conditions.
2Area of stationary object
If large expanse of pavement is used for vehicle testing, then sufficient test area is provided, but test setup complexity and resource requirements increase
Solution Approach 1:
The patent divides the testing approach into small, manageable sample sections rather than requiring large continuous pavement areas. Multiple small samples can be tested independently in the laboratory, eliminating the need for extensive road sections.
Solution Approach 2:
The patent creates simplified copies or models of actual pavement samples in the laboratory setting. These representative samples replicate the essential characteristics of full-scale pavement without requiring the actual large-area infrastructure, enabling testing in controlled environments.
3Reliability
If controlled laboratory environment is used, then test consistency is improved, but real-world environmental variability is eliminated
Solution Approach 1:
The patent incorporates dynamic environmental control capabilities that allow the laboratory testing system to simulate varying real-world conditions. The environment can be adjusted to represent different temperatures, humidities, and loading scenarios, maintaining consistency while representing environmental variability.
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 controlled testing of pavement samples in a laboratory setting, providing precise measurements of compression and durability under controlled environmental conditions, improving the assessment of pavement material quality and durability.
Implementation Method 1
a roller configured for imparting compressive forces to a sample carried by the sample tray
Implementation Method 2
a measurement device in communication with the cylinder for determining an amount of travel of the arm to thus determine an amount of compression of the sample
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.