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Concrete Paving Quality Control Procedures: Air-Void Analyzer (AVA) Mobile App

Freeze-thaw resistance of concrete is primarily controlled by an air-void system with closely spaced small bubbles. The air-void analyzer provides a method of measuring the spacing factor in fresh concrete, rather than waiting for microscopical analysis of hardened concrete. A sample of mortar is taken from the concrete after it has been through the paver and tested immediately, with a result obtained in about 30 minutes. The AVA test should be used for quality control, not acceptance. The Concrete Paving Quality Control Procedures: Air-Void Analyzer (AVA) mobile app covers: Purpose, Principle, Test Procedure, Test Method, Output and Construction Issues. Did you know you know to validate with GoCanvas periodically?

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Take a peek inside the Concrete Paving Quality Control Procedures: Air-Void Analyzer (AVA) Mobile App

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    Freeze-thaw resistance of concrete is primarily controlled by an air-void system with closely spa...

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    Gently stirring a sample of fresh concrete mortar releases the air bubbles through a viscous flui...

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    A sample of fresh concrete mortar is taken from the slab behind the paver using a vibrating cage ...

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    The measurement continues for 25 minutes or until the weight of the bowl remains unchanged for 3 ...

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    Software then processes the scale readings that were taken over time and, using an algorithm, cal...

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    An AASHTO standard is currently being developed for the AVA.

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    Portable drill with vibrating cage for obtaining mortar sample.

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    Air-void analyzer (AVA) with all supplies, cables, etc.

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    Personal computer with AVA software.

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    Test Method – Refer to Applicable AASTHO/ ASTM Standards and CP Tech Center’s AVA Hyperdocument f...

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    Obtain a sample of fresh mortar behind the paver.

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    Using a syringe, extract 20 cc of mortar from the sample.

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    Eject the 20-cc sample from the syringe and gently agitate it for 30 seconds.

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    The bubbles are released from the mortar sample and, over time, rise through the separation liqui...

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    As the bubbles rise, they are collected underneath a submerged bowl.

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    The buoyancy (mass) of the submerged bowl is measured over time as the bubbles are collected.

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    The test is concluded when the mass of the submerged bowl remains constant for 3 minutes or at th...

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    The computer and software collect and analyze the data from the scale, which is part of the AVA.

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    Software provided with the AVA produces tabular and graphical reports.

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    Spacing factor: Values less than 0.

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    Specifi c surface (bubble size): Values greater than 600 in-1 are desirable.

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    Air-void content of paste.

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    Test results should be plotted graphically and monitored to assure air-void properties are within...

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    AVA testing should be implemented as a quality control tool for Level A projects of a critical na...

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    Comparisons between the AVA and ASTM C 457 test results on the same concrete reveal that the AVA ...

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