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Related Concept Videos

Cold Weather Concreting01:27

Cold Weather Concreting

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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.
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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.
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Casting Protocols for the Production of Open Cell Aluminum Foams by the Replication Technique and the Effect on Porosity
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Influence of Rigid Polyurethane Foam Production Technology on Cryogenic Water Uptake.

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Thicker spray-applied rigid polyurethane (PUR) foam insulation significantly improves cryogenic performance by reducing heat transfer and moisture absorption. Surface condition also impacts insulation effectiveness in liquid nitrogen applications.

Keywords:
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Area of Science:

  • Materials Science
  • Cryogenics Engineering

Background:

  • Effective insulation is critical for cryogenic applications like liquid gas storage.
  • Polyurethane (PUR) foam is a common insulation material, but its performance under extreme thermal gradients needs optimization.

Purpose of the Study:

  • To investigate the impact of production technology and surface conditions on spray-applied rigid PUR foam insulation performance in cryogenic environments.
  • To evaluate how insulation thickness and surface treatments affect heat transfer and moisture ingress.

Main Methods:

  • Experimental testing of insulated aluminum vessels using dynamic boil-off of liquid nitrogen (LN2).
  • Evaluation of foam properties: adhesion, mechanical strength, thermal expansion, thermal conductivity, and closed-cell content.
  • Comparison of insulation performance with varying foam thicknesses and surface conditions (rough, machined smooth, urea-coated).

Main Results:

  • Increased insulation thickness led to reduced effective thermal conductivity and moisture uptake.
  • A urea-based coating minimized water absorption but increased overall thermal conductivity.
  • Moisture absorption was concentrated near the foam surface, with no cumulative effects observed over repeated tests.
  • Effective thermal conductivity was influenced by insulation thickness, surface condition, and ambient humidity.

Conclusions:

  • Insulation thickness is a primary factor in enhancing cryogenic performance of PUR foam.
  • Surface treatments can mitigate moisture ingress but may impact thermal conductivity.
  • Optimizing PUR foam insulation for cryogenic applications requires careful consideration of thickness, surface finish, and environmental conditions.