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Concrete Paving Quality Control Procedures: Air Content (Hardened Concrete) Mobile App

Another method of determining the quality of an air-void system in concrete is microscopical analysis of hardened concrete. This method provides information on the total air content, as well as the spacing factor and other parameters. The Concrete Paving Quality Control Procedures: Air Content (Hardened Concrete) mobile app covers: Purpose, Principle, Test Procedure, Test Method, Output and Construction Issues. Use the browser on your mobile device to download GoCanvas.

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Take a peek inside the Concrete Paving Quality Control Procedures: Air Content (Hardened Concrete) Mobile App

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    Another method of determining the quality of an air-void system in concrete is microscopical anal...

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    The air-void structure of concrete can be measured and characterized by examining a section of a ...

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    The manual method is described in ASTM C 457.

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    Alternate automated methods use computer hardware and software to analyze an image of a polished ...

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    Saw for cutting a section of a core.

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    Polishing tools for grinding, lapping, and preparing the core section.

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    Hardware and software for measuring air voids in the core section.

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    Generic Automated Test Method – Refer to ASTM C 457 for Comprehensive Guidance or Manufacturer’s ...

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    Obtain a core from the pavement.

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    Cut a section of the core

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    Grind, lap, and polish the core section until it is smooth and flat.

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    Cover the polished face of the core section with black ink from a stamp pad.

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    Heat the core to 54°C (130°F) and coat the ink-covered core section with a zinc paste.

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    Allow the core section to cool, and scrape the zinc paste off the surface.

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    Mount the prepared core section in the image analysis apparatus.

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    Start the image analysis apparatus.

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    The image analysis hardware and software automatically traverse the section and record the data.

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    The software produces a tabular report showing air content, spacing factor, and specific surface ...

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    The air content is expressed as a percent of volume of the concrete sample.

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    Spacing factor is the average distance from any point to the nearest air void, or the maximum len...

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    Specific surface area is the surface area of the air voids divided by the air voids’ volume.

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    Spacing factors should be less than 0.

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    Air-void spacing can be impacted by many factors, ranging from cement and admixture chemistry to ...

  • ...and More!

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