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Design Example: Aggregate Gradation

Design Example: Aggregate Gradation

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...

Types of Aggregate Grading

Types of Aggregate Grading

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...

Toughness and Hardness of Aggregate

Toughness and Hardness of Aggregate

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...

Abrasion Resistance of Concrete

Abrasion Resistance of Concrete

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...

Aggregates Classification

Aggregates Classification

Aggregate classification is generally based on its size, petrographic characteristics, weight, and source. Size classification ranges from coarse to fine aggregates, defined by the size of the particles. Coarse aggregates are particles that do not pass through ASTM sieve No. 4, and aggregates that pass through the sieve are fine aggregates.
Petrographic classification groups aggregates based on common mineralogical characteristics. Some of the common mineral groups found in aggregates are...

Bonding and Strength of Aggregate

Bonding and Strength of Aggregate

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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Related Experiment Video

Updated: Jun 9, 2025

Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior

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Published on: June 27, 2018

Performance Study of Stabilized Recycled Aggregate Base Material with Two-Gray Components.

Kai Wang^1,2, Xianhu Hu³, Yingjie Yuan²

¹College of Transportation, Shandong University of Science and Technology, Qingdao 266590, China.

Materials (Basel, Switzerland)

|October 26, 2024

Summary

This summary is machine-generated.

Recycled construction waste shows excellent practical road performance, meeting highway standards for sub-base construction. This study validates the feasibility of using these materials in urban road projects.

Keywords:

base material construction waste lime fly ash pavement performance test section

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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties

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Area of Science:

Civil Engineering
Materials Science
Environmental Engineering

Background:

Urban road construction faces challenges with traditional material sourcing and waste disposal.
Construction waste represents a significant environmental burden and a potential resource.
Utilizing recycled construction waste in road sub-bases offers a sustainable alternative.

Purpose of the Study:

To evaluate the practical road performance of recycled construction waste materials.
To investigate the construction technology and feasibility of using these materials in urban road sub-bases.
To analyze the mechanical properties and long-term durability of recycled material-based sub-bases.

Main Methods:

Indoor laboratory tests: sieving analysis and unconfined compressive strength tests.
On-site field tests: periodic core sampling, compaction tests, and rebound deflection tests.
Performance evaluation based on "Technical Specifications for Construction of Highway Pavement Subbase" (JTG/T F20-2015).

Main Results:

Particle gradation of the recycled mix matched target specifications.
Achieved 7-day unconfined compressive strength suitable for heavy traffic, with 14-day strength reaching 7 MPa.
Core samples confirmed good aggregate gradation, profile, thickness, and strength; compaction and deflection tests indicated good deformation resistance.

Conclusions:

Recycled construction waste materials are technically feasible for urban road sub-base construction.
The materials meet stringent highway technical requirements for strength and performance.
This approach offers a sustainable and viable solution for managing construction waste while building robust infrastructure.