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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.
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Pathways to High-Performance Salt Hydrate Thermochemical Energy Storage Materials and Systems.

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Salt hydrate thermochemical materials offer high energy storage but degrade. Improving their stability requires understanding coupled thermo-chemo-mechanical behaviors during cycling.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Energy Storage

Background:

  • Salt hydrate thermochemical materials (TCMs) show potential for thermal energy storage due to high energy densities and low operating temperatures.
  • However, their practical application is limited by poor structural integrity and degradation issues encountered during repeated hygrothermal cycling.

Purpose of the Study:

  • To highlight the limitations of current characterization methods for TCMs.
  • To emphasize the need for advanced *in situ* techniques to study dynamic material evolution.
  • To explore multiscale modeling approaches for predicting and enhancing TCM cycling stability.

Main Methods:

  • Review of existing characterization techniques for TCMs.
  • Discussion of *in situ* measurement of transport properties and structural changes.
  • Outline of multiscale modeling frameworks integrating thermodynamics and mechanics.

Main Results:

  • Current characterization methods are insufficient for capturing the complex evolution of TCMs during cycling.
  • Understanding coupled thermo-chemo-mechanical behaviors across scales is crucial for improving TCM performance.
  • *In situ* techniques and multiscale modeling offer promising avenues for TCM development.

Conclusions:

  • Further research is needed to address key questions regarding TCM stability and lifetime.
  • Developing robust TCMs requires a holistic approach integrating materials science, engineering, and advanced characterization.
  • Transforming TCMs into viable energy storage solutions necessitates overcoming current degradation challenges.