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Related Concept Videos

Microcracking in Concrete01:20

Microcracking in Concrete

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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...
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Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

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Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
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Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

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Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
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Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

140
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...
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Drying Shrinkage01:21

Drying Shrinkage

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When hardened concrete is exposed to air with a relative humidity of less than 100 percent, it begins to lose the free water within its capillaries. As this water evaporates, the water initially adsorbed onto the calcium silicate hydrates migrates towards these now empty spaces and eventually evaporates as well. Over time, as more water leaves, the volume of the concrete decreases, a phenomenon known as drying shrinkage.
A portion of this drying shrinkage can be reversed; if the concrete is...
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Effects of Air-entrainment in Concrete01:28

Effects of Air-entrainment in Concrete

80
Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
80
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  11. Tracking The Aging-induced Evolution In Self-healing Capacities Of Asphalt Binder: Microstructure And Rheology Analysis

Tracking the Aging-Induced Evolution in Self-Healing Capacities of Asphalt Binder: Microstructure and Rheology Analysis

Yang Li1, Rui Gu2, Lei Lyu2

  • 1School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 25, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

This study introduces a novel self-healing asphalt that utilizes polymers with dynamic disulfide bonds. UV aging negatively impacts its self-healing ability by altering polymer structure and distribution.

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Civil Engineering

Background:

  • Asphalt pavement degrades due to environmental factors like UV radiation and thermal oxidation.
  • Developing durable, self-healing materials is crucial for extending pavement lifespan and performance.
  • Polymers with dynamic covalent bonds offer potential for self-healing applications in asphalt.

Purpose of the Study:

  • To develop an efficient and durable self-healing asphalt using polymers with dynamic disulfide bonds.
  • To investigate the impact of thermal oxidative and UV aging on the self-healing properties of modified asphalt.
  • To analyze the microstructural and rheological changes affecting self-healing capacity after aging.

Main Methods:

  • Development of polymer-modified asphalt (PUS-MA) and PUS/styrene butadiene styrene block copolymer-modified asphalt (PUS/SBS-MA).

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  • Evaluation of self-healing promotion using a nonthixotropic system under thermal oxidative and UV aging conditions.
  • Microstructural and rheological analysis via fluorescence microscopy, FTIR, GPC, and DSR.

    • Main Results:

    • UV aging was found to be detrimental to the self-healing promotion effect of PUS.
    • Aging induced changes in modifier distribution, chemical structure, and macromolecular decomposition.
    • Reduced molecular chain mobility and altered hydrogen bonding in polymers correlated with decreased self-healing capacity.

    Conclusions:

    • The self-healing capacity of PUS-modified asphalt is significantly influenced by aging conditions, particularly UV exposure.
    • Molecular chain mobility and hydrogen bonding within dynamic disulfide bond polymers are key determinants of self-healing performance.
    • Understanding aging effects is vital for designing robust self-healing asphalt materials.