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Nuclear asphalt density test - Colorado Department of Transportation

Nuclear asphalt density test - Colorado Department of Transportation 2025

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The document outlines the procedures and data collection for conducting nuclear asphalt density tests by the Colorado Department of Transportation (CDOT). It includes sections for recording test numbers, station details, roller pass numbers, density counts, wet density measurements, and calculations for adjusted field density and relative compaction percentages.

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How to test the density of asphalt?

Using a digital density meter The standard test method (ASTM D8188) requires a digital density meter to measure the asphalt/bitumen samples. A density meter requires less sample volume (around 3 mL to 4 mL, which is about half the amount needed by pycnometers).

How do you measure the density of asphalt?

A conventional method for measuring density (i.e., collecting data) is to extract core samples by coring method and then conduct the in-lab tests. This method, so called destructive method, provides the highly accurate density measurements, but need to destroy the compacted pavement.

How to check compaction of asphalt?

Asphalt pavement compaction is determined from the average maximum specific gravity (MSG) of the asphalt mixture based on the daily average of the contractors field lab results. This MSG value is compared with the bulk specific gravity of each roadway core sample to determine the percent roadway compaction.

What is a nuclear gauge asphalt density?

A nuclear density gauge measures the density of in-place hot mix asphalt (HMA) using gamma radiation. Gamma rays are emitted from the source and interact with electrons in the material.

Would you test asphalt using dry density or wet density?

Note: When taking tests for Asphalt Concrete only record the wet density from the gauge. Establish an area at least 10 feet from any structure and 33 feet from other radioactive sources (another gauge) to take standard counts.

What is the rice test for asphalt density?

The Rice Test for Specific Gravity of Asphalt is a common test that measures the Theoretical Maximum Specific Gravity (Gmm) of asphalt specimens. The test is an integral part of the quality assurance of asphalt mixtures. Free and entrapped air is removed from the asphalt sample to prepare for the test.

Nuclear asphalt density test - Colorado Department of Transportation 2025

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