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Related Concept Videos

Porosity and Absorption of Aggregate01:20

Porosity and Absorption of Aggregate

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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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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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Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...
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Future Porous Materials.

Susumu Kitagawa1,2

  • 1Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University , Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.

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|September 26, 2017
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Summary
This summary is machine-generated.

Porous materials science advances the creation of fuels and valuable chemicals from abundant gases like air. This technology enables sustainable resource utilization from atmospheric components.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sustainable Chemistry

Background:

  • Air is a rich source of nitrogen and oxygen, essential elements for numerous chemical processes.
  • Porous materials offer high surface areas and tunable properties for gas interactions.

Purpose of the Study:

  • To explore the development of porous materials for converting atmospheric gases.
  • To investigate the production of fuels and useful substances from air.

Main Methods:

  • Synthesis of novel porous materials with tailored pore structures.
  • Gas adsorption and catalytic conversion experiments.
  • Characterization of material properties and reaction products.

Main Results:

  • Demonstrated efficient capture and conversion of gaseous feedstocks.
  • Identified key material characteristics for optimal performance.
  • Quantified the yield of target fuels and substances.

Conclusions:

  • Porous materials technology is a viable pathway for sustainable chemical production from air.
  • Further research can optimize material design for enhanced fuel and substance generation.