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ASPHALT CONTENT & VIRGIN AGGREGATE DETERMINATION

ASPHALT CONTENT & VIRGIN AGGREGATE DETERMINATION 2025

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The document outlines the procedure for determining asphalt content and the percentage of virgin aggregate in asphalt mixes during production. It specifies that bitumen content should be measured four times a day, detailing how to record and calculate various metrics related to aggregate and bitumen usage. The form is designed to facilitate simultaneous calculations of asphalt content and virgin aggregate percentage, ensuring compliance with uniformity specifications.

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How to determine optimum asphalt content?

The optimum asphalt content is determined by judging the appearance of the asphalt through the pyrex dishes. The optimum binder content should be determined by observing the excessive mixture draindown, or filling of un- compacted air voids through the pyrex dish.

What are the aggregate specifications for asphalt?

There are actually 5 gradation specifications, each corresponding to a different maximum aggregate size: 37.5 mm, 25 mm, 19 mm, 12.5 mm and 9.5 mm.

How do you calculate asphalt content?

Asphalt contents are determined by measuring the change in mass between the original dry RAP sample and the mass of the final residue aggregate sample after the asphalt is burned off in the ignition furnace. One shortcoming of the process is that a small portion of the aggregate is usually lost in the burning process.

What is the acceptable range of asphalt content?

The final acceptable asphalt content range is 5.1%-5.7%. Meanwhile, considering a long-term ing performance, the high range acceptable range has a high potential for rutting because the plant-produced mixes are permitted to have 0.5% variability.

What process determines asphalt content?

By the Ignition Method A method for the rapid determination of asphalt content has been developed in which the weight of a sample before and after re- moval of the asphalt by burning is utilized.

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