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Related Concept Videos

Masonry Paving01:21

Masonry Paving

246
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,...
246
Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

85
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...
85
Types of Aggregate Grading01:15

Types of Aggregate Grading

382
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...
382
Toughness and Hardness of Aggregate01:22

Toughness and Hardness of Aggregate

237
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...
237
Preplaced Aggregate Concrete01:29

Preplaced Aggregate Concrete

91
Preplaced aggregate concrete is ideal for construction environments that are not easily accessible. The process begins by properly wetting the gap-graded coarse aggregates to remove the dirt, then placing it in the form and compacting it. Voids are filled with a mortar mix pumped under pressure through slotted pipes. This mortar typically consists of Portland cement, pozzolan, fine aggregates, water, and a fluidizing aid. The pozzolan helps reduce bleeding and segregation while improving the...
91
Aggregates Classification01:29

Aggregates Classification

298
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...
298

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Suitable Granular Road Base from Reclaimed Asphalt Pavement.

Oswaldo Guerrero-Bustamante1,2, Amparo Guillen1, Fernando Moreno-Navarro1

  • 1Construction Engineering Laboratory, University of Granada (LabIC.UGR), 18071 Granada, Spain.

Materials (Basel, Switzerland)
|February 26, 2025
PubMed
Summary

Reclaimed Asphalt Pavement (RAP) can replace virgin materials in road base construction. This study shows RAP offers superior load-bearing capacity and reduced permanent deformation compared to traditional granular bases.

Keywords:
Reclaimed Asphalt Pavement (RAP)granular baseroad infrastructuresustainable materials

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Sustainable Construction

Background:

  • Road construction relies heavily on virgin granular materials.
  • Recycled materials like Reclaimed Asphalt Pavement (RAP) offer sustainable alternatives.
  • RAP utilization can provide environmental and cost benefits in infrastructure.

Purpose of the Study:

  • To assess the feasibility of using RAP as a granular base layer in road construction.
  • To evaluate the performance of RAP under simulated in-service and full-scale load conditions.
  • To investigate the impact of design variables like gradation and binder content on RAP performance.

Main Methods:

  • Advanced laboratory testing simulating in-service conditions.
  • Full-scale demonstration of material behavior under static and dynamic loads.
  • Analysis of various gradations and binder contents for RAP.

Main Results:

  • RAP exhibited higher load-bearing capacity than conventional granular bases.
  • RAP demonstrated improved resistance to permanent deformation.
  • Elastic modulus increased by up to 30%, and permanent deformations decreased by approximately 20%.

Conclusions:

  • Reclaimed Asphalt Pavement (RAP) is a viable and high-performing material for granular base layers.
  • RAP utilization enhances structural performance and reduces permanent deformation in road infrastructure.
  • The inherent properties of RAP, including asphalt cement content, contribute to its superior mechanical behavior.