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Related Concept Videos

Hot Weather Concreting01:20

Hot Weather Concreting

64
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,...
64
Design Example: Sustainability in Concrete Building01:26

Design Example: Sustainability in Concrete Building

167
As the construction industry moves towards more eco-friendly practices, concrete's adaptability and its ability to incorporate sustainable features make it a key material in the drive towards greener building solutions.
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground...
167
Mass Concreting01:22

Mass Concreting

62
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...
62
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

81
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.
81
Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

Waterproofing and Anti-Bacterial Admixtures in Concrete

79
Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
Waterproofing admixtures render concrete hydrophobic,...
79
Cold Weather Concreting01:27

Cold Weather Concreting

73
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...
73

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Updated: Jul 1, 2025

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Enhancing Thermal Efficiency in Water Storage Tanks Using Pigmented Recycled Concrete.

Jorge López-Rebollo1, Ignacio Martín Nieto1, Cristina Sáez Blázquez1

  • 1Department of Cartographic and Land Engineering, Higher Polytechnic School of Ávila, University of Salamanca, Hornos Caleros, 50, 05003 Ávila, Spain.

Materials (Basel, Switzerland)
|March 13, 2024
PubMed
Summary
This summary is machine-generated.

Recycled concrete water tanks with coloring pigments offer improved thermal performance, increasing water temperature by 2°C. This sustainable solution promotes construction material circularity and significant energy savings for industrial heating applications.

Keywords:
heat storagepigmented concreterecycled concretethermographic propertieswater tank

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Area of Science:

  • Materials Science
  • Sustainable Construction
  • Thermal Engineering

Background:

  • Construction industry generates significant waste, including precast concrete rejects.
  • Industrial processes requiring water heating are energy-intensive.
  • Improving thermal performance of concrete elements can lead to energy savings.

Purpose of the Study:

  • To manufacture water tanks from recycled concrete incorporating coloring pigments.
  • To enhance the thermal performance of recycled concrete elements for water heating applications.
  • To assess the economic and environmental benefits of the proposed solution.

Main Methods:

  • Mechanical testing (tensile, compression, modulus of elasticity) for concrete dosage validation (HA-30).
  • Laboratory thermal tests on concrete samples with varying pigment concentrations to determine optimal percentage.
  • Field testing of prototype water tanks under real environmental conditions.

Main Results:

  • A suitable concrete dosage for HA-30 structural concrete was determined.
  • An optimal pigment concentration of 1% was identified, with minimal impact on thermal conductivity.
  • Colorized water tanks showed an average water temperature increase of 2°C compared to a reference tank.
  • Potential monthly energy savings of 8625 kWh for industrial water heating.

Conclusions:

  • Recycled concrete with coloring pigments is a viable material for water tanks.
  • The optimized pigment enhances thermal performance, contributing to energy and emissions savings.
  • This approach supports construction material circularity and offers significant economic and environmental benefits.