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Related Concept Videos

Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

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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.
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Retarders01:19

Retarders

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Retarders are chemical admixtures designed to extend the setting time, which is especially useful when there is a delay in sequential concrete pours to prevent cold joints and to achieve a cohesive structure. Retarders, when used in appropriate amounts, can also enhance the architectural appearance of exposed aggregate finishes.
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Design Example: Managing Concrete Workability01:14

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Toughness and Hardness of Aggregate01:22

Toughness and Hardness of Aggregate

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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...
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Concrete's susceptibility to frost damage during freeze-thaw cycles demands strategic measures to enhance its frost resistance. Employing techniques like air entrainment, adjusting the water-cement ratio, proper curing, and selecting appropriate aggregates are essential.
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Related Experiment Video

Updated: Jun 14, 2025

Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
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Rheological Performance and Differences between Laboratory-Aged and RAP Bitumen.

Noemi Baldino1, Olga Mileti1, Ylenia Maria Marchesano1

  • 1Department of Information, Modeling, Electronics and System Engineering (D.I.M.E.S.), University of Calabria, Via P. Bucci, Cubo 39C, I-87036 Rende, CS, Italy.

Materials (Basel, Switzerland)
|August 29, 2024
PubMed
Summary
This summary is machine-generated.

Recycled asphalt pavement (RAP) binders show higher performance than laboratory-aged bitumen. Soybean oil rejuvenates lab-aged binders but not naturally aged RAP binders, highlighting limitations in current aging simulation methods.

Keywords:
PAVagingoxidationpavementsoybean oilviscosity

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Chemical Engineering

Background:

  • Traditional binder extraction from recycled asphalt pavement (RAP) is solvent-intensive and not cost-effective for field studies.
  • Laboratory aging using the Pressure Aging Vessel (PAV) is common but may not accurately replicate real-world aging conditions.
  • Differences between laboratory and in-service aged bitumen can impact rejuvenator selection and result interpretation.

Purpose of the Study:

  • To compare the thermo-rheological behavior of bitumen aged via PAV versus binders extracted from RAPs.
  • To investigate the effect of soybean oil (SO) as a rejuvenator on both laboratory-aged and naturally aged bitumen.

Main Methods:

  • Comparative analysis of rheological performances using dynamic oscillatory and steady-state tests.
  • Evaluation of bitumen aged using the Pressure Aging Vessel (PAV) and two different RAP binders.
  • Assessment of the impact of 3% soybean oil (SO) addition on aged bitumen samples.

Main Results:

  • RAP binders exhibited higher strength and viscosity compared to the PAV-aged bitumen sample.
  • Soybean oil addition decreased moduli and viscosity in laboratory-aged bitumen but showed no significant effect on naturally aged RAP binders.
  • Cross-over frequency and rheological parameters revealed substantial differences in SO's effect on viscosity between aged bitumen types.

Conclusions:

  • Naturally aged RAP binders demonstrate superior performance compared to PAV-aged bitumen.
  • Current standard aging techniques inadequately simulate real-world conditions, affecting rejuvenator efficacy.
  • Further research is needed for effective regeneration or modification of aged bitumen, considering the limitations of standard testing procedures.