Related Experiment Video
Updated: Jul 21, 2025
08:59
Determination of Aggregate Surface Morphology at the Interfacial Transition Zone ITZ
Published on: December 16, 2019
8.2K
Evaluation of the Adhesion between Aggregate and Asphalt Binder Based on Image Processing Techniques Considering
Min Li1, Jian Wang1, Zibao Guo2
1School of Civil Engineering and Geomatics, Shandong University of Technology, Zibo 255000, China.
Materials (Basel, Switzerland)
|July 29, 2023
Summary
This study introduces a new quantitative method to assess aggregate-asphalt adhesion using image processing, improving upon subjective boiling water tests. It reveals that complex aggregate shapes and homogeneity significantly impact asphalt adhesion and water stability.
Area of Science:
- Civil Engineering
- Materials Science
Background:
- Aggregate-asphalt adhesion is crucial for asphalt concrete water stability.
- Current evaluation methods rely on subjective judgment in boiling water tests, lacking accuracy.
- Existing research lacks quantitative methods and discussion on aggregate shape's effect on adhesion.
Purpose of the Study:
- To develop an innovative, quantitative method for evaluating aggregate-asphalt adhesion.
- To investigate the influence of aggregate shape (aspect ratio and homogeneity) on adhesion using the new method.
Main Methods:
- Utilized the Chinese boiling water test combined with image processing techniques.
- Quantitatively analyzed aggregate-asphalt adhesion and asphalt membrane peeling.
- Investigated the effects of aggregate aspect ratio and homogeneity on adhesion.
Main Results:
- Developed a quantitative evaluation method for aggregate-asphalt adhesion.
- Found that increased aggregate shape complexity leads to more severe asphalt membrane peeling.
- Aggregate homogeneity has a greater effect on asphalt membrane peeling than aspect ratio.
Conclusions:
- The proposed image processing-based method offers a quantitative alternative to subjective adhesion tests.
- Aggregate shape, particularly homogeneity, significantly influences the water stability of asphalt concrete.
- This research provides a foundation for improved material selection and performance prediction in asphalt pavements.
Related Concept Videos
01:12Bonding and Strength of Aggregate
217
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
217
01:25Shape and Texture of Coarse Aggregate
235
Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of...
235
01:22Toughness and Hardness of Aggregate
294
Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
294
01:20Porosity and Absorption of Aggregate
324
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
324
01:25Deleterious Substances in Aggregate
198
Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
Another type of impurity is clay and fine material that...
198
01:15Types of Aggregate Grading
598
Aggregate grading is crucial in economically obtaining a concrete mix with adequate strength, reasonable workability, and minimal segregation. There are four types of aggregate gradation: well-graded, uniformly (or one-sized) graded, gap-graded, and open-graded.
Well-graded aggregates include a complete range of necessary size fractions that fit together to create a dense matrix with minimal voids, represented by a smooth, continuous gradation curve. This type of grading ensures good...
Well-graded aggregates include a complete range of necessary size fractions that fit together to create a dense matrix with minimal voids, represented by a smooth, continuous gradation curve. This type of grading ensures good...
598