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Related Concept Videos

Hot Weather Concreting01:20

Hot Weather Concreting

Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
Mass Concreting01:22

Mass Concreting

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...
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...
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...
Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units and sand dry and...

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Related Experiment Video

Updated: May 28, 2026

Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight
08:03

Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight

Published on: May 31, 2022

Numerical Simulation Study on the Temperature Rise Characteristics of Asphalt Pavement During Hot In-Place Recycling.

Chuanyi Ma1,2, Jizhe Zhang2, Bokai Liu3

  • 1Shandong Hi-Speed Group Co., Ltd., Jinan 250098, China.

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

Optimizing hot in-place recycling for asphalt pavements requires understanding heating parameters. Lowering travel speed and increasing hot air temperature significantly improve deep-layer pavement temperatures for better recycling efficiency.

Keywords:
asphalt pavementheat penetration efficiencyheating parametershot in-place recyclingnumerical simulation

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Thermal Engineering

Background:

  • Hot in-place recycling (HIPR) is crucial for asphalt pavement maintenance.
  • Heating efficiency in HIPR depends on hot air temperature, velocity, and travel speed.
  • The precise influence of these parameters on deep-layer pavement temperature is not fully understood.

Purpose of the Study:

  • To investigate the impact of key heating parameters on asphalt pavement temperature profiles during HIPR.
  • To elucidate the interaction mechanisms between hot air temperature, velocity, and travel speed.
  • To provide a theoretical foundation for optimizing HIPR processes.

Main Methods:

  • Development of a three-dimensional transient heat transfer model for asphalt pavement.
  • Simulation of intermittent heating conditions using varying hot air temperature, velocity, and travel speed.
  • Analysis of pavement surface temperature and temperature at 4 cm depth.

Main Results:

  • Travel speed has the most significant impact on deep-layer temperature (regression coefficient of 8.5 °C·min/m).
  • Reducing travel speed by 0.5 m/min increases deep-layer temperature by ~4.25 °C.
  • A 50 °C increase in hot air temperature raises deep-layer temperature by ~5.75 °C; hot air velocity has a minor effect (12-14 m/s).

Conclusions:

  • Heat penetration efficiency increases with higher hot air temperature and velocity, or lower travel speed.
  • A clear quantitative relationship between heating parameters and temperature responses was established.
  • Findings offer a theoretical basis for optimizing HIPR parameter selection for enhanced pavement recycling.