Rolling Cyclic Fatigue Platform for Asphalt Ductility

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Solution Overview

Problem

Current methods for maintaining and repairing asphalt pavement are inefficient and costly, as they fail to address the underlying embrittlement of the asphalt binder, leading to premature deterioration and reduced lifespan of the pavement.

Innovation Solution

A testing apparatus and method that induces a traffic analogous, 60 cycle stress-strain environment in a pavement sample using a rolling cyclic fatigue platform, allowing for the measurement of microstrain growth and linear acceleration to determine fatigue performance and remaining useful life, thereby identifying areas for improvement in pavement design and construction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If conventional pavement maintenance methods are used, then repair costs are reduced in the short term, but pavement lifespan is reduced and durability is compromised

Engineering Contradiction:

Improvepavement lifespanVSAvoidmaintenance cost efficiency

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The patent applies preliminary action by detecting microstrain growth and fatigue indicators before visible pavement deterioration occurs. The testing apparatus measures internal stress changes in the asphalt binder, allowing maintenance to be performed proactively rather than reactively, thereby extending pavement lifespan while optimizing maintenance timing and resource allocation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback through continuous monitoring of pavement condition using embedded sensors that detect microstrain, linear acceleration, and fatigue parameters. This real-time data feedback enables dynamic adjustment of maintenance strategies, allowing pavement managers to respond to actual pavement health status rather than relying on fixed schedules, thus improving both lifespan and cost efficiency.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If visual inspection methods are used to assess pavement condition, then inspection simplicity is maintained, but detection precision of fatigue damage is insufficient

Engineering Contradiction:

Improvefatigue damage detection accuracyVSAvoidtesting apparatus complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces conventional visual inspection methods with a sophisticated testing apparatus that uses mechanical sensors to detect microstrain and internal stress changes in the asphalt binder. The system includes strain gauges, accelerometers, and a rolling cyclic fatigue platform that applies controlled loads to induce and measure fatigue damage, providing precise quantitative data far superior to visual inspection while maintaining operational feasibility through automated data collection and analysis.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If reactive pavement repair is performed after visible damage occurs, then immediate repair needs are addressed, but underlying embrittlement is not addressed

Engineering Contradiction:

Improvepavement durabilityVSAvoidtime to detect and repair

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent enables preliminary action by detecting microstrain growth and fatigue indicators before visible pavement deterioration occurs. The testing apparatus measures internal stress changes in the asphalt binder, allowing maintenance to be performed proactively rather than reactively, thereby extending pavement lifespan while optimizing maintenance timing and resource allocation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Inventive Principle:

Principle #23Feedback

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 approach provides accurate and cost-effective data on pavement condition and fatigue performance, enabling the extension of pavement lifespan and improving durability by allowing for targeted design and construction modifications.

Implementation Method 1

induces a traffic analogous, 60 cycle, stress-strain environment into a road pavement cross section through a rolling cyclic fatigue platform

Methodology Applied

Scientific EffectStress-strain deformation: Deformation

Implementation Method 2

a three axis microstrain inertial sensor supported on the lower surface of the pivoting sample plate, wherein the three axis microstrain inertial sensor is configured to measure linear acceleration in the Y-axis direction and an angular rate of microstrain growth occurring within a pavement sample during the test

Methodology Applied

Scientific EffectInertial measurement: Accelerometer

Data Source

PatentUS11474013B2Rolling cyclic fatigue test platform for determining asphalt ductility

Publication Date: 2022.10.18 COE WILLIAM B

AI summary

A Fatigue Performance Test induces a traffic analogous, 60 cycle, stress-strain environment into a road pavement cross section through a rolling cyclic fatigue platform. Data from the encounter dynamic reveals where strain build-up is occurring well before external, visually detectable evidence of fatigue failure is present in the pavement sample from cracks or permanent deformation. Responsive tuning of the embedded, sensor firmware establishes a baseline status for the sample whereupon incoming data gathered during the stress-strain encounter dynamic reveals details of fatigue build-up.