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Related Concept Videos

Mass Concreting01:22

Mass Concreting

49
Mass concreting refers to the process of placing large volumes of concrete, such as in gravity dams. The heat generated during the cement hydration process and differential cooling rates within the concrete mass can lead to a temperature gradient, which can result in thermal cracks in the concrete mass.
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
49
Preplaced Aggregate Concrete01:29

Preplaced Aggregate Concrete

88
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...
88
Placing Concrete01:17

Placing Concrete

65
The concrete is placed as close as possible to its final position to avoid segregation. The placed concrete is then fully compacted to expel the entrapped air, and the next layer of concrete is laid while the underlying layer is still in the plastic state. The rate at which concrete is placed and compacted is kept equal.
While placing concrete, care is taken to ensure that the concrete is laid in uniform layers, and hand shoveling and moving concrete using poker vibrators is avoided. Also,...
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Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

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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.
65
Masonry Paving01:21

Masonry Paving

236
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,...
236
Compacting Factor test01:22

Compacting Factor test

98
The compacting factor test is a method used to assess the workability of concrete. It is  especially suitable for concrete mixes containing aggregates up to one and a half inches in size. This test involves specialized equipment consisting of two truncated cone-shaped hoppers and a cylinder, all with polished interior surfaces to minimize friction.
The procedure begins by placing concrete into the upper hopper without any compaction. Once filled, the bottom door of this hopper is opened,...
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Related Experiment Video

Updated: May 16, 2025

Design and Construction of an Urban Runoff Research Facility
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Thermal compaction as an alternative approach for full-RAP base layer construction.

Lisley Madeira Coelho1, Belayne Zanini Marchi2, Pedro Henrique Poubel Mendonça da Silveira2

  • 1Department of Fortification and Construction, Military Institute of Engineering - IME, Praça General Tibúrcio, 80, Praia Vermelha, Urca, Rio de Janeiro, RJ, CEP 22290-270, Brazil. madeiralisley@gmail.com.

Scientific Reports
|May 12, 2025
PubMed
Summary

Using thermal compaction for Reclaimed Asphalt Pavement (RAP) warm bases significantly enhances road base stability. This method improves mechanical properties, reducing permanent deformation and increasing resilient modulus for durable, sustainable pavements.

Keywords:
Mechanical characterizationPermanent deformationReclaimed asphalt pavement (RAP)Stabilization of baseWarm base

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Sustainable Pavement Design

Background:

  • Reclaimed Asphalt Pavement (RAP) offers a sustainable alternative to virgin aggregates in road construction.
  • The inherent variability in RAP properties presents challenges for achieving consistent mechanical performance in pavement layers.
  • Developing methods to stabilize RAP is crucial for maximizing its use in high-quality pavement structures.

Purpose of the Study:

  • To investigate the effectiveness of thermal compaction in stabilizing 100% Reclaimed Asphalt Pavement (RAP) mixtures.
  • To evaluate the impact of elevated compaction temperatures on the mechanical behavior of RAP base layers, termed a 'warm base'.
  • To quantify the influence of compaction temperature on permanent deformation (PD) and resilient modulus (RM) of RAP mixtures.

Main Methods:

  • Preparation of Reclaimed Asphalt Pavement (RAP) mixtures exclusively from RAP material.
  • Application of thermal compaction at varying temperatures to create 'warm base' specimens.
  • Performance evaluation using repeated load triaxial tests to measure permanent deformation (PD) and resilient modulus (RM).

Main Results:

  • Increasing compaction temperature significantly improved the mechanical behavior of RAP base materials.
  • Permanent deformation (PD) was reduced by up to 52% at the highest stress level with higher compaction temperatures.
  • Resilient modulus (RM) showed substantial increases, with RAP-M samples exhibiting approximately 187.13% higher values than RAP-F maximum and 389.05% higher than RAP-F minimum.

Conclusions:

  • Thermal compaction is an effective strategy for stabilizing Reclaimed Asphalt Pavement (RAP) mixtures, creating a high-performance warm base.
  • This technique mitigates the challenges posed by RAP variability, enabling greater incorporation of recycled materials in pavements.
  • The study demonstrates the potential for enhanced pavement structural quality and sustainability through optimized RAP utilization.