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Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
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Updated: Dec 9, 2025

Stress Distribution During Cold Compression of Rocks and Mineral Aggregates Using Synchrotron-based X-Ray Diffraction
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Structural response of α-quartz under plate-impact shock compression.

Sally June Tracy1,2, Stefan J Turneaure3, Thomas S Duffy1

  • 1Department of Geosciences, Princeton University, Princeton, NJ 08544, USA.

Science Advances
|September 14, 2020
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Summary

Shock compression of quartz (SiO2) reveals a new disordered metastable phase, challenging the long-held assumption of stishovite formation under dynamic pressure. This finding impacts geophysics and materials science understanding.

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Area of Science:

  • Geophysics
  • Materials Science
  • Mineral Physics

Background:

  • Quartz (SiO2) is crucial in geophysics and materials science, extensively studied under dynamic compression.
  • Previous research suggests quartz transforms to a dense high-pressure phase under shock loading, often assumed to be stishovite.
  • However, direct crystal structure data for shock-compressed quartz has been lacking.

Purpose of the Study:

  • To determine the crystal structure of shock-compressed α-quartz.
  • To investigate phase transformations of SiO2 under dynamic compression up to 65 GPa.
  • To challenge existing assumptions about quartz's high-pressure behavior.

Main Methods:

  • Utilized gas-gun shock compression.
  • Employed in situ synchrotron X-ray diffraction for real-time structural analysis.
  • Examined α-quartz samples subjected to shock pressures up to 65 GPa.

Main Results:

  • Observed a phase transformation in shock-compressed α-quartz.
  • The resulting high-pressure phase is disordered and metastable.
  • This phase is neither crystalline stishovite nor amorphous SiO2.

Conclusions:

  • The dynamic compression of quartz does not lead to the stishovite phase as previously assumed.
  • A novel disordered metastable phase of SiO2 is formed under shock conditions.
  • This discovery necessitates a re-evaluation of quartz's behavior under extreme dynamic pressures.