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Related Concept Videos

Moisture Content and Bulking of Aggregate01:10

Moisture Content and Bulking of Aggregate

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The moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption.
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Porosity and Absorption of Aggregate01:20

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Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
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Mortar Properties01:17

Mortar Properties

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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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Cavity Drainage and Flashings in Masonry walls01:20

Cavity Drainage and Flashings in Masonry walls

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Typically, a cavity wall consists of two wythes separated by a gap of at least 2 inches, which may contain insulation while still maintaining a minimum clear space of 1 inch to facilitate adequate drainage. Advanced methods like the insertion of a continuous drainage mat can further reduce this space while ensuring effective moisture expulsion.
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Measurement of Air Content in Concrete01:23

Measurement of Air Content in Concrete

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Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
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General External Flow Characteristics01:26

General External Flow Characteristics

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The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
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Updated: Apr 11, 2026

Fabric Moisture Uniform Control to Study the Influence of Air Impingement Parameters on Fabric Drying Characteristics
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Structure-Property Relationships for Moisture-Swing Direct Air Capture.

John Hegarty1, Michael L Barsoum1, Megan Burrill1

  • 1Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States.

Environmental Science & Technology
|April 10, 2026
PubMed
Summary
This summary is machine-generated.

Moisture-swing carbon capture using ion-exchange resins (IERs) shows promise for efficient CO2 removal. Optimizing resin pore size, ion type, and anion is key to enhancing direct air capture performance.

Keywords:
carbon dioxide removalcryoporometryhumidity-driven carbon capturenegative emissions technologiespore size distributionsolid-state NMRstrong-base anion-exchange resinswater-mediated adsorption

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Efficient and low-cost atmospheric CO2 capture is crucial for developing negative-emission technologies.
  • Moisture-swing carbon capture offers a low-energy pathway, but its underlying structure-property relationships require further investigation.

Purpose of the Study:

  • To systematically investigate the impact of various structural and chemical properties on the humidity-driven carbon dioxide (CO2) capture performance of strong-base ion-exchange resins (IERs).
  • To establish practical design rules for optimizing IERs for direct air capture (DAC) applications.

Main Methods:

  • Systematic investigation of 10 commercial IERs with varying polymer backbones, ammonium functionalities, pore architectures, and counteranions.
  • Assessment of thermodynamic and kinetic capture behaviors using closed-loop cycling with ambient CO2 at different relative humidity (RH) levels.
  • Characterization of morphological and chemical properties using SEM/EDS, N2 sorption, NMR cryoporometry, solid-state NMR, and FTIR spectroscopy.

Main Results:

  • Macroporous IERs with intermediate, well-connected pores demonstrated superior CO2 capture capacity and kinetics compared to gel-type resins.
  • The interplay between ion identity and ammonium functionality influenced swing capacity, with Type I and Type II IERs performing better with phosphate and carbonate, respectively.
  • Anion choice affected kinetics, while acrylic backbones enhanced water uptake. Humidity-driven protonation was confirmed via solid-state NMR.

Conclusions:

  • Optimizing IER pore architecture, ion functionality, and counteranion type is essential for enhancing moisture-swing CO2 capture efficiency.
  • The study provides critical design guidelines for developing improved sorbent materials for direct air capture.
  • Understanding structure-property relationships is key to advancing low-energy carbon capture technologies.