United States Department of Transportation
i
In-place voids monitoring of hot mix asphalt pavements : follow-up.
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2014-01-01
[PDF-254.77 KB]
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Abstract:In order to validate the policy of allowing the adjustment of the asphalt cement to reduce the laboratory
air voids up to one percent, cores were taken over a period of four years on 19 paving projects and
tested for air voids. After being compacted by traffic over several years, the average air voids in these
pavements were 3.8%. Since the design air voids are required to be between 3.5% and 4.5%, the
monitoring validates the effectiveness of the policy. However, there was significant scatter in the data
with most of the in-place voids falling out of this design range.
Implementation
The asphalt cement adjustment policy has been validated, but more guidance needs to be developed to
reduce scatter. CDOT should consider additional guidance in making AC adjustments to achieve more
consistent in-place voids. Forensic analysis of any pavement showing premature failure related to mix
problems may help in developing and fine-tuning this guidance.
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