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Related Concept Videos

Unsoundness of Aggregate due to Volume Change01:26

Unsoundness of Aggregate due to Volume Change

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Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
337
Microcracking in Concrete01:20

Microcracking in Concrete

413
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
413
Toughness and Hardness of Aggregate01:22

Toughness and Hardness of Aggregate

568
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...
568
Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

440
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...
440
Deleterious Substances in Aggregate01:25

Deleterious Substances in Aggregate

512
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...
512
Moisture Content and Bulking of Aggregate01:10

Moisture Content and Bulking of Aggregate

404
The moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption.
When aggregates are exposed to rain or sit in stockpiles, they absorb moisture, which must be...
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Related Experiment Video

Updated: Jan 10, 2026

Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight
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Investigating asphalt aggregate bonding degradation through aging and temperature effects using multiscale testing

Lemin Liu1, Tao Liu2, Xiaohua Fan1

  • 1Shandong High-Speed Infrastructure Construction Co., Ltd., Jinan, 250098, China.

Scientific Reports
|November 27, 2025
PubMed
Summary
This summary is machine-generated.

Limestone aggregates offer superior moisture resistance in asphalt due to strong chemical bonds. This study validates a new method for assessing asphalt-aggregate adhesion, crucial for durable pavement design.

Keywords:
Asphalt-aggregate adhesionDigital image analysisMoisture damage resistanceQuantitative adhesion assessmentSurface energy theory

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Geology

Background:

  • Moisture damage significantly impacts asphalt mixture durability.
  • Interfacial adhesion between asphalt binders and aggregates is a key factor.
  • Understanding aggregate-binder interactions is vital for pavement longevity.

Purpose of the Study:

  • To systematically evaluate asphalt-aggregate adhesion performance.
  • To develop and validate a novel quantitative method for adhesion assessment.
  • To investigate the influence of aggregate type, asphalt modification, temperature, and aging on adhesion.

Main Methods:

  • Digital image analysis and surface energy theory were employed.
  • Water immersion tests combined with pixel-based stripping area analysis were used.
  • Four asphalt types (OR50, OR70, OR90, ORSBS) and five aggregates (limestone, basalt, granite, diabase, diorite) were tested.

Main Results:

  • Limestone demonstrated excellent adhesion stability (100% under aging) attributed to chemical bonding.
  • Acidic aggregates like granite showed high sensitivity to moisture and aging.
  • The novel quantitative method showed high correlation (R² > 0.9) with surface energy values.
  • Thermal/oxidative aging reduced adhesion, with SBS-modified asphalt showing better performance.

Conclusions:

  • Aggregate alkalinity is a critical factor for moisture resistance in asphalt mixtures.
  • Polymer modification, particularly with SBS, enhances binder-aggregate adhesion and durability.
  • The validated quantitative method provides a reliable framework for material selection in pavement engineering.