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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...
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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.
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Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the 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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Impact strength in concrete is a critical measure that reflects the material's capability to endure the forces applied during pile driving and when supporting machinery foundations that experience impulsive loads. It is also essential when handling precast concrete components to prevent accidental damage. The impact strength is assessed by observing the concrete's resistance to repeated impacts and energy absorption capacity. A key indicator of significant damage to concrete is when it...
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Mortar joint deterioration is a significant concern in masonry structures, with water accumulation in the joints leading to damage from freeze-thaw cycles. The repeated expansion of water during freezing and its melting during thawing develop and propagate cracks in the masonry joints. Eventually, this leads to the spalling of mortar from the joints, loosening masonry units and weakening the structure. The deteriorated mortar joints are also vulnerable to moisture intrusion into the walls.
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Modeling Interface Damage with Random Interface Strength on Asphalt Concrete Impervious Facings.

Hui Peng1,2, Nanxuan Qian1,2, Desheng Yin1,2

  • 1Hubei Key Laboratory of Hydropower Engineering Construction and Management, China Three Gorges University, Yichang 443002, China.

Materials (Basel, Switzerland)
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PubMed
Summary

This study models interface damage in asphalt concrete facings for dams, revealing heterogeneous damage and stress oscillations in ogee sections due to complex interface behavior.

Keywords:
Mazars damageadhesion–decohesion damagecohesive zone modelimpervious facings

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Geotechnical Engineering

Background:

  • Asphalt concrete facings are critical impervious structures for rockfill dams and pumped storage power stations.
  • These facings possess a multilayer structure where interface properties significantly influence overall performance.

Purpose of the Study:

  • To develop and validate a model for investigating complex interface damage in asphalt concrete facings under static loads.
  • To analyze the damage distribution and stress characteristics at interfaces within the facing layers.

Main Methods:

  • A numerical model incorporating the cohesive zone model (CZM) with Weibull-type random interface strength distribution for adhesion-decohesion damage.
  • Mazars' model was used to describe bulk damage within each layer.
  • Validation of the CZM through comparison with indoor direct shear tests.

Main Results:

  • The cohesive zone model (CZM) proved reliable for simulating asphalt concrete layer interfaces.
  • Simulations revealed heterogeneous interface damage and oscillating shear stresses between the sealing and impervious layers, particularly in ogee sections.
  • Local tension stress in ogee sections led to significantly greater damage compared to other areas.

Conclusions:

  • The developed model accurately captures complex interface damage behavior in asphalt concrete facings.
  • Interface characteristics, especially in curved ogee sections, are critical for facing integrity and performance.
  • Understanding heterogeneous damage and stress concentrations is vital for designing durable impervious structures.