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Related Concept Videos

Mass Concreting01:22

Mass Concreting

106
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...
106
Hot Weather Concreting01:20

Hot Weather Concreting

115
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,...
115
Cold Weather Concreting01:27

Cold Weather Concreting

109
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...
109
Strength and Heat of Hydration01:29

Strength and Heat of Hydration

302
The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
302
Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

127
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...
127
Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

222
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...
222

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Thermal Energy Storage (TES) Prototype Based on Geopolymer Concrete for High-Temperature Applications.

Mohammad Rahjoo1, Guido Goracci1, Juan J Gaitero2

  • 1Centro de Física de Materiales, CSIC-UPV/EHU, Paseo Manuel de Lardizábal 5, 20018 Donostia-San Sebastián, Spain.

Materials (Basel, Switzerland)
|October 27, 2022
PubMed
Summary

Geopolymer concrete (GEO) offers superior thermal energy storage (TES) capabilities compared to Ordinary Portland Cement (OPC) concrete. GEO withstands temperatures over 500 °C, making it ideal for high-temperature industrial applications.

Keywords:
OPCcementconcretegeopolymer high-temperature TESthermal energy storage

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sustainable Construction

Background:

  • Thermal energy storage (TES) is crucial for industrial efficiency and power plant dispatchability.
  • Ordinary Portland Cement (OPC) concrete is a common TES material but degrades above 400 °C.
  • High-temperature TES materials are needed for advanced industrial heat applications.

Purpose of the Study:

  • To experimentally evaluate the performance and heat storage capacity of geopolymer-based concrete (GEO).
  • To compare the high-temperature capabilities of GEO with OPC-based materials for TES applications.
  • To identify advanced materials for industrial TES systems operating at elevated temperatures.

Main Methods:

  • Experimental investigation of geopolymer-based concrete (GEO) performance.
  • Comparative analysis of GEO and Ordinary Portland Cement (OPC) concrete under thermal load.
  • Measurement of thermal storage capacity and thermal diffusion coefficient at high temperatures.

Main Results:

  • Geopolymer concrete (GEO) demonstrated stable performance at temperatures exceeding 500 °C.
  • GEO exhibited a higher thermal storage capacity than OPC-based materials.
  • GEO possesses a high thermal diffusion coefficient at elevated temperatures, enhancing its TES potential.

Conclusions:

  • Geopolymer concrete (GEO) is a viable and competitive material for high-temperature thermal energy storage (TES) applications.
  • GEO offers superior performance and durability compared to OPC-based materials in demanding industrial environments.
  • The findings support the use of GEO in industries requiring robust and efficient high-temperature TES solutions.