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Related Concept Videos

Plasticizers01:31

Plasticizers

127
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...
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Superplasticizers01:30

Superplasticizers

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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,...
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Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

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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...
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Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

260
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...
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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Masonry Paving01:21

Masonry Paving

310
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,...
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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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Using Waste Plastics as Asphalt Modifier: A Review.

Fengchi Xu1, Yao Zhao1, Kangjian Li1

  • 1College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China.

Materials (Basel, Switzerland)
|January 11, 2022
PubMed
Summary
This summary is machine-generated.

Recycled plastic waste in asphalt significantly enhances high-temperature performance, offering economic and environmental advantages. Further research is needed to optimize blends and understand modification mechanisms for improved stability and low-temperature properties.

Keywords:
asphalt binder and mixturecompatibilitycomposite modificationperformancerecycled waste plastic

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Environmental Science

Background:

  • Growing use of waste materials in asphalt production for economic and environmental benefits.
  • Increasing interest in utilizing recycled waste plastic for asphalt modification.

Purpose of the Study:

  • To review and compare various waste plastics and incorporation methods in asphalt.
  • To analyze the properties of waste plastics, asphalt binders, and modified mixtures.
  • To discuss challenges and potential solutions for waste plastic-modified asphalt.

Main Methods:

  • Comprehensive literature review and analysis of existing studies.
  • Comparison of single and composite modification approaches.
  • Focus on properties of waste plastics, asphalt binders, and asphalt mixtures.

Main Results:

  • Incorporation of plastic waste can significantly improve asphalt's high-temperature performance.
  • Performance is influenced by waste source, dosage, blending, and pretreatment.
  • Chemical methods (additives, functionalization) show promise for better plastic-binder interaction.

Conclusions:

  • Waste plastic modification offers potential economic and environmental benefits for asphalt.
  • Challenges include stability, low-temperature performance, and understanding modification mechanisms.
  • Further research is required to determine optimal blend proportions and explore composite modification mechanisms.