Sonnenbrand Basalt Aggregate Evaluation and Utilization
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Solution Overview
Problem
The sonnenbrand phenomenon in basalt aggregates causes premature degradation and waste in asphalt pavements due to sensitivity to environmental factors, leading to resource inefficiency and pavement damage, as existing evaluation methods result in the disqualification of high-quality stones without proper utilization.
Innovation Solution
A method for evaluating and utilizing sonnenbrand basalt aggregates involves mixing them into asphalt mixtures, conducting thermal aging experiments, calculating a thermal aging factor, and adjusting construction conditions such as temperature and duration to prevent the sonnenbrand phenomenon, allowing for the safe use of these aggregates in pavement construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If basalt aggregate is used in asphalt pavement, then the pavement can be constructed with available materials, but the sonnenbrand phenomenon causes premature degradation and resource waste
Solution Approach 1:
The patent changes the evaluation parameters from simple boiling test results to a comprehensive thermal aging factor (AF = T × t) that considers both temperature and duration. This allows differentiation between basalt that can be used with controlled parameters and that which cannot, resolving the contradiction by enabling safe utilization while preventing degradation.
Solution Approach 2:
The patent performs preliminary thermal aging experiments to determine the sonnenbrand trigger conditions before actual pavement construction. By calculating the theoretical thermal aging factor and comparing it with actual construction conditions, the method prevents premature degradation before it occurs, rather than merely detecting it after damage has happened.
2Reliability
If strict upper limit standards are applied to disqualify sonnenbrand basalt, then pavement quality can be ensured, but a large quantity of stone resources are wasted
Solution Approach 1:
The patent transforms the binary pass/fail evaluation into a continuous parameter-based evaluation system. By introducing the thermal aging factor (AF) that combines temperature and time, the patent identifies specific construction parameter ranges that enable safe use of previously disqualified basalt, thereby reducing resource waste while maintaining pavement quality.
Solution Approach 2:
The patent makes the evaluation dynamic by linking basalt usability to specific construction conditions (temperature and duration). Rather than a static disqualification, the method allows flexibility in construction parameters to accommodate basalt that would otherwise be rejected, enabling resource utilization while ensuring quality through controlled dynamic conditions.
3Measurement precision
If thermal aging experiments are conducted under different temperatures and durations, then accurate evaluation of basalt performance can be achieved, but the experimental complexity and time consumption increase
Solution Approach 1:
The patent reduces experimental complexity by changing from multiple detailed tests to a simplified two-parameter system (temperature T and duration t). By focusing only on these two critical parameters and calculating their product as the thermal aging factor, the patent achieves accurate evaluation with fewer experimental variables, thereby reducing complexity while maintaining precision.
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 method accurately evaluates the paving performance of sonnenbrand basalt aggregates, reduces resource waste, and ensures the aggregates meet pavement requirements by controlling thermal aging factors, thereby preventing premature degradation and maintaining road performance.
Implementation Method 1
carrying out experiments on several proportions of the asphalt mixture prepared in the S1 under conditions of different thermal aging temperatures and different thermal aging durations
Implementation Method 2
Basalt contains some special components that are sensitive to temperature, moisture, etc. due to geological action, rock-forming environment, etc., which may cause spots and cracks to gradually appear on the surface of poorly weathered basalt aggregates if exposed to long-term high water immersion at high temperatures
Data Source
AI summary
Provided is a method for evaluating and utilizing sonnenbrand basalt aggregate, including steps as follows: mixing a basalt aggregate defined as sonnenbrand basalt into an asphalt mixture; carrying out thermal aging experiments at different temperatures and durations to obtain a theoretical trigger time ti for the sonnenbrand phenomenon under a thermal aging temperature Ti; further calculating to obtain a theoretical thermal aging factor AF0 for the sonnenbrand phenomenon; statistically calculating a thermal aging factor AF for an actual construction to evaluate a performance of the basalt aggregate, if AF<AF0, the construction may be carried out normally, if AF≥AF0, then shortening the transportation and waiting duration and/or lowering the factory temperature of the asphalt mix so that the thermal aging factor AF<AF0 during actual construction.