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Related Concept Videos

Superplasticizers01:30

Superplasticizers

88
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
88
Plasticizers01:31

Plasticizers

77
Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
77
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

100
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
100
Retarders01:19

Retarders

72
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.
The function of retarders is to delay the setting of concrete, and this effect can be measured using a penetration test. The retardation process involves adding...
72
Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

142
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...
142
Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

85
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
85

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Characterizing the Effect of Freeze-Thaw Cycling on Pore Structure of Asphalt Concrete Mixtures Using X-ray CT Scanning.

Materials (Basel, Switzerland)·2023
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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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Performance of Bituminous Binder Modified with Recycled Plastic Pellets.

Haithem Soliman1, Paul Osei2, Ahmed Shalaby2

  • 1Department of Civil, Geological and Environmental Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N 5A9, Canada.

Materials (Basel, Switzerland)
|October 28, 2023
PubMed
Summary

Recycled plastic pellets improve asphalt binder performance in cold regions. Polyester-based (PP) plastic waste enhanced elastic response and rutting resistance more effectively than nylon-based (NP) plastic waste.

Keywords:
MSCR testSuperpave PGmodified binderplastic wasterecycled plastic

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Environmental Engineering

Background:

  • Addressing the environmental challenge of waste plastics requires finding beneficial applications.
  • Limited research exists on asphalt mixtures with plastic waste, especially in cold climates prone to freeze-thaw cycles.

Purpose of the Study:

  • To assess the effect of adding nylon-based (NP) and polyester-based (PP) recycled plastic pellets on the high- and low-temperature properties of bituminous binders.
  • To investigate the influence of Elvaloy copolymer and polyphosphoric acid on these modified binders.

Main Methods:

  • Modification of a PG 58-28 bituminous binder with varying dosages of NP and PP recycled plastic pellets.
  • Evaluation of binder performance at high and low temperatures.
  • Assessment of the impact of additional modifiers like Elvaloy and polyphosphoric acid.

Main Results:

  • Recycled plastic pellets enhanced the elastic response and rutting resistance of bituminous binders.
  • The low-temperature performance of the binders was not negatively affected by the addition of plastic pellets.
  • Polyester-based (PP) plastic pellets demonstrated superior elastic behavior and rutting resistance compared to nylon-based (NP) pellets.

Conclusions:

  • Recycled plastic pellets offer a viable solution for improving asphalt binder properties, particularly in terms of high-temperature performance and durability.
  • The choice of plastic type (PP vs. NP) influences the degree of performance enhancement.
  • This study contributes to sustainable infrastructure development by promoting the use of waste plastics in road construction.