Transportation Engineering - Vol 2 | 1. Pavement materials: Aggregates by Abraham | Learn Smarter
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Knowledge
1. Pavement materials: Aggregates

Aggregates play a crucial role in the construction of pavements, comprising a majority of the composition in materials like bituminous and Portland cement concrete. Their specific properties, such as strength, hardness, toughness, and shape, significantly affect pavement durability and performance. Various tests are essential to evaluate these properties and ensure that aggregates meet the necessary standards for construction use.

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Sections

  • 22

    Pavement Materials: Aggregates

    This section focuses on aggregates used in pavement construction, detailing their properties, testing methods, and significance.

    Learning Practice

  • 22.1

    Overview

    This section provides an overview of aggregates used in pavement materials, detailing their composition, significance, and variations.

    Learning Practice

  • 22.2

    Desirable Properties

    This section discusses the key desirable properties of aggregates used in pavement construction, including strength, hardness, toughness, shape, adhesion with bitumen, durability, and freedom from deleterious particles.

    Learning Practice

  • 22.2.1

    Strength

    This section discusses the importance of strength in aggregates used in pavement materials, emphasizing their resistance to various stressors.

    Learning Practice

  • 22.2.2

    Hardness

    This section discusses the importance of hardness in aggregates used for pavement surfaces, emphasizing their ability to withstand abrasion from vehicle traffic.

    Learning Practice

  • 22.2.3

    Toughness

    Toughness is the ability of aggregates to resist impact, which is vital for the durability of pavements.

    Learning Practice

  • 22.2.4

    Shape Of Aggregates

    The shape of aggregates significantly influences their strength and durability in construction.

    Learning Practice

  • 22.2.5

    Adhesion With Bitumen

    This section discusses the importance of the adhesion of aggregates to bitumen in bituminous pavements, emphasizing that aggregates should have lower affinity for water to avoid stripping of the bituminous coating.

    Learning Practice

  • 22.2.6

    Durability

    Durability refers to the ability of road aggregates to withstand weather-induced deterioration.

    Learning Practice

  • 22.2.7

    Freedom From Deleterious Particles

    This section discusses the importance of using clean aggregates in pavement construction free from harmful materials.

    Learning Practice

  • 22.3

    Aggregate Tests

    This section outlines essential tests performed on aggregates to determine their suitability for pavement construction.

    Learning Practice

  • 22.3.1

    Crushing Test

    The crushing test measures the resistance of aggregates to crushing under compressive stress, a vital property for pavement construction.

    Learning Practice

  • 22.3.2

    Abrasion Test

    The abrasion test assesses the hardness of aggregates to determine their suitability for pavement construction.

    Learning Practice

  • 22.3.3

    Impact Test

    The impact test evaluates the resistance of aggregates to impact forces, crucial for assessing their suitability in pavement applications.

    Learning Practice

  • 22.3.4

    Soundness Test

    The soundness test evaluates the durability of aggregates against weathering, crucial for quality pavement.

    Learning Practice

  • 22.3.5

    Shape Tests

    Shape tests assess the shape of aggregate particles, particularly focusing on the percentage of flaky and elongated particles.

    Learning Practice

  • 22.3.6

    Specific Gravity And Water Absorption

    This section explores the significance of specific gravity and water absorption of aggregates in pavement materials, highlighting their roles in the design of concrete and bituminous mixes.

    Learning Practice

  • 22.3.7

    Bitumen Adhesion Test

    The Bitumen adhesion test evaluates the ability of bitumen to adhere to road aggregates under wet conditions.

    Learning Practice

  • 22.4

    Summary

    Aggregates are critical for pavement performance, requiring thorough testing for strength and durability.

    Learning Practice

  • 22.5

    Problems

    This section introduces problems associated with aggregates used in pavement materials.

    Learning Practice

References

22.pdf

Class Notes

Memorization

What we have learnt

  • Aggregates constitute a maj...
  • The desirable properties of...
  • Focused testing of aggregat...

Final Test

Revision Tests