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Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

268
The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
The grading, or particle-size distribution, of sand is determined using sieve analysis, with standard sizes ranging from 150 μm to 10 mm (ASTM No. 100 sieve to 3⁄8 in. sieve). Sand is...
268
Types of Aggregate Grading01:15

Types of Aggregate Grading

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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...
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Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

249
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
249
Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

448
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...
448
Masonry Paving01:21

Masonry Paving

420
The construction of masonry paving involves using materials such as bricks, stones, and concrete masonry units. These materials are chosen for their shape, color, strength, and resistance to abrasion and weathering. Masonry units can be installed dry on a thin layer of sand and a gravel base, or they can be embedded in mortar or asphalt on a concrete slab. For areas subjected to heavy vehicular loads, a rigid base layer of reinforced or unreinforced concrete is recommended. In contrast,...
420
Toughness and Hardness of Aggregate01:22

Toughness and Hardness of Aggregate

539
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...
539

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Related Experiment Video

Updated: Dec 31, 2025

Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight
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Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight

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Optimizing Gradation Design for Ultra-Thin Wearing Course Asphalt.

Wentian Cui1, Kuanghuai Wu1, Xu Cai1

  • 1School of Civil Engineering, Guangzhou University, Guangzhou 510006, China.

Materials (Basel, Switzerland)
|January 8, 2020
PubMed
Summary

A new Ultra-thin Wearing Course-10 (UTWC-10) asphalt mixture offers superior rutting resistance and high-temperature stability. This advanced asphalt also demonstrates promising skid resistance and improved durability for road surfaces.

Keywords:
functional pavement layerhigh-temperature stabilitypavement performance testultra-thin wearing course asphalt mixture

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Pavement Engineering

Background:

  • Ultra-thin wearing course asphalt mixtures are crucial for road surface reconstruction and functional layers.
  • Improving rutting resistance and high-temperature stability is essential for pavement longevity.
  • Existing asphalt mixtures require enhanced performance characteristics.

Purpose of the Study:

  • To develop and evaluate an Ultra-thin Wearing Course-10 (UTWC-10) asphalt mixture.
  • To enhance high-temperature stability and skid resistance of asphalt wearing courses.
  • To compare the performance of UTWC-10 with traditional asphalt mixtures.

Main Methods:

  • Utilized the Course Aggregate Void Filling (CAVF) method for mixture design.
  • Conducted high-temperature rutting tests to assess dynamic stability (DS).
  • Performed anti-sliding performance attenuation tests using a coarse aggregate polishing machine.

Main Results:

  • UTWC-10 exhibited significantly higher rutting dynamic stability (DS) than traditional mixtures.
  • The designed UTWC-10 demonstrated promising skid resistance.
  • UTWC-10 showed superior low-temperature crack resistance and water stability.

Conclusions:

  • The UTWC-10 asphalt mixture provides excellent high-temperature rutting resistance and skid resistance.
  • UTWC-10 offers improved durability and performance compared to conventional asphalt wearing courses.
  • This research validates UTWC-10 as a high-performance material for road construction.