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Related Concept Videos

Hydration of Cement01:24

Hydration of Cement

636
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...
636
Pore Size Distribution01:23

Pore Size Distribution

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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
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Silica Gel Column Chromatography: Overview01:10

Silica Gel Column Chromatography: Overview

3.0K
Silica gel column chromatography is a technique for separating compounds using a column packed with silica gel as the stationary phase. This method relies on differences in the polarity of compounds. Based on their polarities, compounds move between the stationary phase (silica gel) and the mobile phase (the solvent), forming discrete bands in the column.
Polar components tend to bind strongly to the silica gel, causing them to move slowly through the column. In contrast, nonpolar compounds...
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Strength and Heat of Hydration01:29

Strength and Heat of Hydration

547
The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
547
Alkali Aggregate Reaction in Concrete01:26

Alkali Aggregate Reaction in Concrete

389
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
389
Soundness of Cement01:17

Soundness of Cement

414
The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
414

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Structural characterization of gel-derived calcium silicate systems.

Anikó Meiszterics1, László Rosta, Herwig Peterlik

  • 1Institute of Chemistry, L. Eötvös University, H-1117 Budapest, Hungary.

The Journal of Physical Chemistry. A
|September 11, 2010
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Summary

This study synthesizes calcium silicate ceramics for biomedical uses, focusing on processing-structure relationships. Spectroscopic analysis clarifies calcium-oxygen-silicon bonds, crucial for material properties.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Ceramic Science

Background:

  • Calcium silicate ceramics are promising for biomedical applications due to their biocompatibility and bioactivity.
  • Understanding the relationship between processing parameters and the resulting structure is crucial for tailoring material properties.
  • Spectroscopic and structural characterization techniques are essential for elucidating material composition and morphology.

Purpose of the Study:

  • To synthesize calcium silicate ceramics with properties suitable for biomedical applications.
  • To investigate the processing-structure relationships in sol-gel derived calcium silicate systems.
  • To identify and characterize calcium-oxygen-silicon bonds using spectroscopic methods.

Main Methods:

  • Sol-gel synthesis route was employed, varying chemical compositions, catalyst concentration, aging, and heat treatment conditions.
  • Fourier transform infrared (FTIR) and 29Si magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy were used to analyze bond systems.
  • Scanning electron microscopy (SEM), small-angle neutron scattering (SANS), small-angle X-ray scattering (SAXS), wide-angle X-ray scattering (WAXS), and X-ray diffraction (XRD) were utilized to study aggregate structures.

Main Results:

  • The study successfully synthesized calcium silicate systems via a sol-gel route.
  • Processing parameters significantly influenced the evolved phases and structures.
  • Spectroscopic analyses provided insights into the formation and nature of Ca-O-Si bonds.

Conclusions:

  • The sol-gel method is effective for producing calcium silicate ceramics for biomedical applications.
  • Detailed understanding of processing-structure relationships is key to optimizing ceramic properties.
  • Spectroscopic and scattering techniques are vital for comprehensive material characterization.