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Related Concept Videos

Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

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.
To address...
Frost Resistant Concrete01:29

Frost Resistant Concrete

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.
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of entrained...
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

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...
Cold Weather Concreting01:27

Cold Weather Concreting

When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
To counteract the negative impacts of cold weather, ensuring...
Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
Measurement of Air Content in Concrete01:23

Measurement of Air Content in Concrete

Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
The pressure method,...

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Related Experiment Video

Updated: May 28, 2026

Preparation of Carbon Fiber and Bamboo Fiber Reinforced Poly (butylene Adipate-co-terephthalate) Foams by Supercritical Carbon Dioxide Foaming
07:56

Preparation of Carbon Fiber and Bamboo Fiber Reinforced Poly (butylene Adipate-co-terephthalate) Foams by Supercritical Carbon Dioxide Foaming

Published on: October 10, 2025

Multi-Parameter Collaborative Optimization of Foamed Asphalt Cold Recycling Mixture Properties.

Wei Qiu1, Bin Li2,3,4, Ziyi Song2,3

  • 1Poly Changda Overseas Engineering Co., Ltd., No. 942, Middle of Guangzhou Avenue, Tianhe District, Guangzhou 510000, China.

Materials (Basel, Switzerland)
|May 27, 2026
PubMed
Summary

This study optimized foamed asphalt for cold recycling, finding asphalt type crucial for performance. Optimal foaming conditions and mixture designs were identified for enhanced mechanical properties and durability in recycled asphalt pavements.

Keywords:
cold recycled mixturefoamed asphaltfoaming characteristicsindirect tensile strengthinfluencing factors

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Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall
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Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall

Published on: January 6, 2023

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Last Updated: May 28, 2026

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12:21

Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall

Published on: January 6, 2023

Area of Science:

  • Civil Engineering
  • Materials Science
  • Pavement Engineering

Background:

  • Cold recycling with foamed asphalt is a sustainable pavement rehabilitation technique.
  • Understanding foamed asphalt characteristics is key to optimizing cold recycled mixture performance.
  • Key performance indicators include expansion ratio and half-life for foamed asphalt.

Purpose of the Study:

  • To investigate the foaming properties of asphalt and their impact on cold recycled mixture performance.
  • To determine the optimal parameters for foamed asphalt production and cold recycled mixture design.
  • To analyze the influence of various factors on the mechanical properties and water stability of recycled mixtures.

Main Methods:

  • Evaluated foaming characteristics using expansion ratio and half-life.
  • Analyzed the effects of asphalt type, foaming temperature, and water content on foaming.
  • Investigated the influence of asphalt content, gradation, cement content, curing time, and mixing water on mixture performance.

Main Results:

  • Asphalt type significantly impacts foaming performance; CNOOA asphalt foamed optimally at 160°C with 2% water.
  • Optimal asphalt contents were 3.5% for gradation A and 2.5% for gradation B.
  • 1.5% cement content balanced performance, and curing time most significantly influenced mechanical properties.

Conclusions:

  • Asphalt type is the primary factor in foamed asphalt performance.
  • Specific optimal parameters for asphalt content, cement content, and mixing water were established for different gradations.
  • Curing time, cement content, and asphalt content are critical for optimizing the performance of cold recycled mixtures.