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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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The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
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Pore-scale Imaging and Characterization of Hydrocarbon Reservoir Rock Wettability at Subsurface Conditions Using X-ray Microtomography
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Intrinsic Wettability of Talc.

Shubhankar Kundu1, Lei Li2, Haitao Liu1

  • 1Department of Chemistry, University of Pittsburgh, 219 Parkman Ave, Pittsburgh, Pennsylvania 15260, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
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Summary
This summary is machine-generated.

Talc

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Area of Science:

  • Mineralogy
  • Surface Chemistry

Background:

  • Talc's hydrophobicity is traditionally viewed as an inherent mineral characteristic.
  • Previous studies have not accounted for surface contamination effects.

Purpose of the Study:

  • To investigate the true nature of talc's surface properties.
  • To determine the cause of talc's observed hydrophobicity.

Main Methods:

  • Preparation of a freshly exposed talc surface.
  • Monitoring water contact angle over time upon air exposure.
  • Spectroscopy analysis to identify surface contaminants.
  • Control experiments to validate findings.

Main Results:

  • Freshly prepared talc surfaces exhibit significant hydrophilicity.
  • Water contact angle increases upon exposure to ambient air, indicating a transition to hydrophobicity.
  • Spectroscopy confirms the presence of airborne hydrocarbons on the talc surface.
  • The rate of hydrocarbon deposition, and thus hydrophobicity development, is dependent on relative humidity.

Conclusions:

  • Talc's hydrophobicity is not an intrinsic property but is acquired through airborne hydrocarbon contamination.
  • Surface wetting behavior of talc is dynamic and influenced by environmental conditions like humidity.