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Thermal Insulation in Masonry Walls01:22

Thermal Insulation in Masonry Walls

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In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
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Masonry in Cold and Hot Weather Conditions01:21

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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.
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The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
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Masonry walls are subject to slight expansion and contraction due to variations in temperature and moisture. Thermal movement in masonry is relatively straightforward to measure and plan for. On the other hand, moisture movement poses more of a challenge. New clay masonry units typically absorb water and expand over time under normal environmental conditions. Conversely, new concrete masonry units tend to shrink as they lose the excess moisture acquired during their production process.
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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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Masonry curtain walls employ brick or stone veneers supported by the building's structure to form an external cladding system that is both aesthetically appealing and functional. These walls are erected through two principal techniques, first by traditional layering of masonry units and second by using prefabricated panels. Traditional construction relies on steel shelf angles attached to the spandrel beam for support, with high-bond mortars ensuring secure attachment of masonry veneer...
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Data on external walls from a multi-objective simulation for cold climates.

Cristina Baglivo1, Paolo Maria Congedo1

  • 1Department of Engineering for Innovation, University of Salento, 73100 Lecce, Italy.

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This study optimized precast wall designs for energy efficiency in cold climates. Several wall configurations were identified as optimal, balancing thermal performance, cost, and sustainability.

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Area of Science:

  • Building Science
  • Sustainable Materials
  • Energy Efficiency

Background:

  • Optimizing building materials is crucial for energy-efficient construction, especially in cold climates.
  • Precast walls offer potential for high performance but require careful material selection and design.
  • Existing methodologies may not fully integrate thermal, cost, and sustainability factors for cold climate applications.

Purpose of the Study:

  • To apply a multi-objective optimization process to building materials for high energy-efficient precast walls suitable for cold climates.
  • To identify optimal configurations of precast walls considering thermal properties, sustainability, and costs.
  • To evaluate the dynamic behavior of building components using advanced simulation tools.

Main Methods:

  • Utilized the modeFRONTIER optimization tool (rel. 4.3) for multi-objective analysis.
  • Evaluated dynamic building component behavior according to UNI EN ISO 13786:2008 standards.
  • Input data included material thermal properties, sustainability metrics, and supply/installation costs.

Main Results:

  • Generated numerous high-efficiency precast wall configurations categorized by thickness: thick, thin, and ultra-thin.
  • Simulation outputs were tailored for cold climates, focusing on thermal performance, cost-effectiveness, and sustainability scores.
  • Identified multiple optimal combinations of external precast walls for cold climate conditions.

Conclusions:

  • The multi-objective optimization approach effectively identified energy-efficient precast wall solutions for cold climates.
  • Optimal wall designs balance thermal insulation, material costs, and environmental impact.
  • The study provides valuable data for selecting high-performance precast external walls in demanding climatic regions.