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Related Concept Videos

Shotcrete01:18

Shotcrete

121
Shotcrete is a specialized technique where mortar or small aggregate concrete rich in cement content is sprayed onto a surface at high velocity. The force of impact compacts the material and enables it to cling to vertical or overhead areas without sagging. The technique involves layering the shotcrete in stages until it reaches approximately 4 inches in thickness. Operator skill in nozzle management is pivotal in deciding the quality of the shotcrete. Shotcrete is used in constructing tunnel...
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Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

Waterproofing and Anti-Bacterial Admixtures in Concrete

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Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
Waterproofing admixtures render concrete hydrophobic,...
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Soundness of Cement01:17

Soundness of Cement

222
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...
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Mortar Joint Deterioration in Masonry01:13

Mortar Joint Deterioration in Masonry

152
Mortar joint deterioration is a significant concern in masonry structures, with water accumulation in the joints leading to damage from freeze-thaw cycles. The repeated expansion of water during freezing and its melting during thawing develop and propagate cracks in the masonry joints. Eventually, this leads to the spalling of mortar from the joints, loosening masonry units and weakening the structure. The deteriorated mortar joints are also vulnerable to moisture intrusion into the walls.
The...
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Microcracking in Concrete01:20

Microcracking in Concrete

186
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
186
Testing Water Quality01:14

Testing Water Quality

162
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
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Updated: Aug 19, 2025

Optimized Sealing Process and Real-Time Monitoring of Glass-to-Metal Seal Structures
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Ultrasonic Quality Assurance at Magnesia Shotcrete Sealing Structures.

Vera Lay1, Ute Effner1, Ernst Niederleithinger1

  • 1Bundesanstalt für Materialforschung und Prüfung, 12205 Berlin, Germany.

Sensors (Basel, Switzerland)
|November 26, 2022
PubMed
Summary

Ultrasonic echo testing shows promise for quality assurance in magnesia concrete shotcrete used for nuclear waste disposal. While effective for detecting large defects like delamination, further development is needed to reliably identify smaller flaws.

Keywords:
engineered barrierimagingmagnesia concreteshotcreteultrasonicsunderground

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Area of Science:

  • Nuclear Engineering
  • Materials Science
  • Geotechnical Engineering

Background:

  • Engineered barriers are crucial for safe nuclear waste disposal.
  • Magnesia concrete applied via shotcrete is a researched construction method for these barriers.
  • Non-destructive testing is essential for quality assurance during construction.

Purpose of the Study:

  • To evaluate the ultrasonic echo method for quality assurance of magnesia concrete shotcrete.
  • To assess the method's capability in imaging internal structures and defects.
  • To investigate the potential of phase analysis for defect characterization.

Main Methods:

  • Application of the ultrasonic echo method on magnesia concrete shotcrete test blocks.
  • Imaging of internal structures, including backwall and boreholes.
  • Analysis of ultrasonic signals, including phase analysis, to identify and characterize defects.

Main Results:

  • Successful imaging of internal structures and large defects like delamination was achieved.
  • Ultrasonic imaging did not consistently identify concrete section boundaries, verified by drilling.
  • Detection of artificial defects (cracks, voids, low-density material) proved challenging, highlighting method limitations; smaller defects were often missed.

Conclusions:

  • Ultrasonic imaging offers a suitable foundation for quality assurance in nuclear waste repository sealing structures.
  • Further development is necessary to improve the reliability and validation of the ultrasonic method.
  • The method holds potential for enhancing the safety of nuclear waste repositories despite current limitations.