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Related Concept Videos

Hot Weather Concreting01:20

Hot Weather Concreting

95
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,...
95
Mass Concreting01:22

Mass Concreting

95
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...
95
Cold Weather Concreting01:27

Cold Weather Concreting

98
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...
98
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

102
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.
102
Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

192
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...
192
Frost Resistant Concrete01:29

Frost Resistant Concrete

108
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...
108

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Eco-Concrete in High Temperatures.

Marcin Sundin1, Hans Hedlund1, Andrzej Cwirzen1

  • 1Building Material Department of Civil, Environmental and Natural Resources Engineering, 97187 Lulea, Sweden.

Materials (Basel, Switzerland)
|June 28, 2023
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Summary

Sustainable concrete using industrial waste shows promise for a greener future. These eco-concretes often outperform traditional concrete, especially at temperatures up to 400 °C, but fire resistance needs further study.

Keywords:
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Area of Science:

  • Materials Science
  • Civil Engineering
  • Environmental Science

Background:

  • Growing demand for sustainable construction materials.
  • Need for effective waste management solutions in the construction industry.
  • Concerns regarding the durability of eco-concretes, particularly under fire conditions.

Purpose of the Study:

  • To review literature on sustainable and fire-resistant concrete binders and aggregates.
  • To evaluate the performance of eco-concretes compared to ordinary Portland cement (OPC) concrete.
  • To identify gaps in research regarding fire resistance testing and standards for eco-concretes.

Main Methods:

  • Comprehensive literature review of sustainable concrete technologies.
  • Analysis of studies focusing on industrial by-products as cement replacements (e.g., GGBFS, fly ash).
  • Examination of research on fire-resistant aggregates and various testing methodologies.

Main Results:

  • Eco-concretes utilizing industrial waste often exhibit superior performance to OPC concrete up to 400 °C.
  • Mixes with partial or total cement replacement show favorable outcomes.
  • Research has primarily focused on matrix components, with less attention to post-exposure sample treatment.

Conclusions:

  • Sustainable concrete incorporating industrial waste offers significant environmental and performance benefits.
  • Further research is needed on the fire resistance of eco-concretes, especially concerning standardized testing methods.
  • Standardized small-scale testing protocols are lacking for evaluating the fire performance of these advanced concrete materials.