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Related Concept Videos

Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

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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.
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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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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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Hydration of Cement01:24

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Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
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Porosity in Cement Paste01:18

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The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
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Mortar Joint Deterioration in Masonry

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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.
The...
101
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  11. Innovative Geopolymer Tiles For Indoor Humidity Control: A Comparative Study Of Moisture Buffering Performance

Innovative Geopolymer Tiles for Indoor Humidity Control: A Comparative Study of Moisture Buffering Performance

Gurkan Akarken1,2, Yildiz Yildirim3, Ugur Cengiz2,4

  • 1Department of Energy Resources and Management, Faculty of Engineering, Çanakkale Onsekiz Mart University, Çanakkale 17010, Türkiye.

ACS Omega
|March 17, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Innovative geopolymer tiles demonstrate superior moisture buffering capabilities for indoor humidity control. These novel construction materials offer enhanced performance compared to conventional options, paving the way for healthier indoor environments.

Area of Science:

  • Materials Science
  • Construction Engineering
  • Building Physics

Background:

  • Geopolymers are gaining traction in construction for their unique properties.
  • Controlling indoor relative humidity is crucial for occupant comfort and building health.
  • Passive humidity control materials offer sustainable building solutions.

Purpose of the Study:

  • To evaluate innovative geopolymer tiles for passive indoor relative humidity control.
  • To systematically develop geopolymer tiles with enhanced moisture buffering capabilities.
  • To compare the performance of geopolymer tiles made from different metakaolins.

Main Methods:

  • Production of geopolymer tiles using four distinct and one commercial metakaolin.
  • Determination of Moisture Buffer Value (MBV) using the Nordtest method in a controlled climate chamber.

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  • Conducting custom moisture buffer tests, strength measurements, and physical appearance inspections after water submersion.

    • Main Results:

    • Geopolymer tiles exhibited exceptional moisture buffering performance.
    • MBV values ranged from 5.68 to 7.94 (g/m² Δ%HR), representing the highest reported values for geopolymer tiles.
    • The study demonstrated superior performance compared to conventional materials, supported by mechanical, morphological, and structural analyses.

    Conclusions:

    • The developed geopolymer tiles possess significant potential as passive materials for indoor humidity regulation.
    • These novel materials offer a sustainable and effective solution for improving indoor environmental quality.
    • The findings highlight the advanced hygroscopic properties of geopolymers for construction applications.