Asphalt Damage-Healing Evaluation via Energetics Principle

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Solution Overview

Problem

Existing methods for evaluating the damage-healing characteristics of asphalt materials are inefficient and dependent on damage states and rest periods, which hinders the prediction of fatigue durability and performance of pavement structures.

Innovation Solution

A method and apparatus based on the energetics principle that calculates the average stored pseudo strain energy (QH) required for damage-healing, using formulas such as QH=AHΔN, where AH is the numerical integral of stored pseudo strain energy and ΔN is the local life compensation, independent of damage state and rest periods, relying only on the magnitude of strain load.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If existing methods for evaluating damage-healing characteristics are used, then evaluation can be performed under different damage states and rest periods, but test efficiency is relatively low

Engineering Contradiction:

Improveevaluation under different damage states and rest periodsVSAvoidtest efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent transforms the evaluation approach by changing from multiple conditional tests (different damage states and rest periods) to a single energetics-based parameter (average stored pseudo strain energy QH) that inherently captures healing characteristics across all conditions, thereby improving test efficiency while maintaining adaptability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent extracts the essential healing characteristic from complex multi-parameter testing by isolating the average stored pseudo strain energy QH as the key indicator, separating the core healing property from the variable test conditions to achieve efficient evaluation

Inventive Principle:

Principle #2Taking out (Extraction)

2Measurement precision

If existing evaluation methods dependent on damage states and rest periods are used, then comprehensive damage-healing characteristics can be assessed, but the evaluation index varies with test conditions reducing consistency

Engineering Contradiction:

Improvecomprehensive damage-healing assessmentVSAvoidevaluation index consistency

Core Design Contradiction:

Measurement precisionVSStability of the object's composition

Solution Approach 1:

The patent creates a universal evaluation index QH that functions across all damage states and rest periods, making the evaluation method independent of specific test conditions while maintaining comprehensive assessment capability through the energetics principle

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11860150B2Method and apparatus for evaluating damage-healing characteristics of paving asphalt based on energetics principle

Publication Date: 2024.01.02 BEIJING UNIV OF TECH

AI summary

A method for evaluating damage-healing characteristics of paving asphalt based on energetics principle includes: obtaining a numerical integral AH of a stored pseudo strain energy required by asphalt to compensate damage-healing to loading times and obtaining local life compensation ΔN of the asphalt benefiting from damage-healing characteristics; calculating an average stored pseudo strain energy QH of the asphalt according to the following formula:QH=AHΔ⁢N;and evaluating the asphalt damage-healing characteristics according to the average stored pseudo strain energy QH of the asphalt. This method is based on the evolution law of the average stored pseudo strain energy required to compensate the damage-healing to explore the damage-healing characteristics of asphalt. As a characteristic index of materials, this energy evaluation index has nothing to do with the damage state and the rest periods, but only depends on the strain load, which improves the testing efficiency.