DOT Density Testing and Inspection: Precautions in Performing the AASHTO T-99 Test

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The DOT Density Testing and Inspection: Precautions in Performing the AASHTO T-99 Test mobile app has been prepared to document procedures used by the Department of Transportation (DOT) to assure quality in density testing and inspection in the field.

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This app is intended to train and aid technicians performing density testing on DOT projects.

The department uses the AASHTO T-99 (Method C, Modified) test as a referee or supplemental test to the One-Point T-99 test to determine the Maximum Density of soils having a loss-by-washing greater than 15 percent. It is usually used by the inspector at the direction of the Area Density Specialist. The equipment used is the same as that used for the One-Point T-99 Test except for the One-Point Chart. This test establishes a moisture-density relationship; thus, it is important that the compactive effort is standard and uniform throughout the entire series of molds to ensure accuracy of the results.

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