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Related Concept Videos

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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Mortar Properties01:17

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Mortar properties encompass a range of characteristics crucial for construction and masonry work, including workability, water retention, bond strength, durability, compressive strength, volume change, and appearance. Workability refers to mortar's ability to be easily applied and manipulated without sagging or falling off surfaces, which is important for efficient masonry unit placement and alignment. Water retention is essential to prevent the mortar from losing moisture too quickly to...
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Mortar01:29

Mortar

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Mortar, a mixture of Portland cement, hydrated lime, sand, and water, is a crucial binding material in construction. Its primary function is to join masonry units together, filling gaps and ensuring a uniform distribution of weight across the structure. This helps in preventing potential weaknesses. Mortar also serves as a protective barrier against environmental elements such as water and wind, thereby safeguarding the interior of the structure. It also compensates for surface irregularities...
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Aggregates Classification01:29

Aggregates Classification

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Aggregate classification is generally based on its size, petrographic characteristics, weight, and source. Size classification ranges from coarse to fine aggregates, defined by the size of the particles. Coarse aggregates are particles that do not pass through ASTM sieve No. 4, and aggregates that pass through the sieve are fine aggregates.
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Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
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Mortar Joint Deterioration in Masonry01:13

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Mortar joint deterioration is a significant concern in masonry structures, with water accumulation in the joints leading to damage from freeze-thaw cycles. The repeated expansion of water during freezing and its melting during thawing develop and propagate cracks in the masonry joints. Eventually, this leads to the spalling of mortar from the joints, loosening masonry units and weakening the structure. The deteriorated mortar joints are also vulnerable to moisture intrusion into the walls.
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Recovered Tire-Derived Aggregates for Thermally Insulating Lightweight Mortars.

Elhem Ghorbel1, Safiullah Omary2, Ali Karrech3

  • 1Department of Civil Engineering, CY Cergy Paris Université, 5 Mail Gay Lussac, Neuville-sur-Oise, 95031 Cergy Pontoise Cedex, France.

Materials (Basel, Switzerland)
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Summary

Recycled tire aggregates in cement mortars improve thermal insulation and reduce waste. Mortars with up to 50% crumb rubber are suitable for non-structural repair, balancing insulation with strength.

Keywords:
bond strengthcrumb rubberend-of-life tires (ELTs)lightweight mortarsmechanical propertiesthermal properties

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Environmental Science

Background:

  • End-of-life tires (ELTs) pose significant waste management challenges due to their non-biodegradable nature.
  • Recycling ELTs into construction materials offers a sustainable solution to reduce environmental impact and conserve natural resources like sand.

Purpose of the Study:

  • To investigate the use of crumb rubber from recycled tires in cement-based mortars for enhanced thermal insulation.
  • To evaluate the effects of varying crumb rubber content on mortar properties for building repair applications.
  • To develop sustainable mortars that minimize structural load and energy consumption.

Main Methods:

  • Eight mortar mixtures were prepared with crumb rubber content ranging from 0% to 100%.
  • Physical and mechanical properties were tested, including density, workability, air content, setting time, thermal conductivity, and compressive strength.
  • The relationship between crumb rubber content and mortar performance was analyzed.

Main Results:

  • Increasing crumb rubber content decreased thermal conductivity, enhancing insulation properties.
  • Mortars with up to 50% crumb rubber content met standards for non-structural repair applications.
  • Higher crumb rubber content led to a decrease in mechanical strength and an increase in air content.

Conclusions:

  • Cement-based mortars incorporating crumb rubber show potential for improved thermal insulation and reduced environmental footprint.
  • Mortars with 25%-50% crumb rubber are viable for non-structural repair, offering a balance between insulation and adequate strength.
  • This research promotes ELT recycling, reducing reliance on virgin materials and contributing to sustainable construction practices.