Details:

Creators:
Cooley, Jr., L. Allen ; Williams, Kevin
Cooley, Jr., L. Allen ; Williams, Kevin Less -
Corporate Creators:
Burns Cooley Dennis, Inc.
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Absorption Aggregates Aging (Materials) Binder Content Durability Field Studies Hot Mix Paving Mixtures Laboratory Tests Mix Design Processing (Materials) Specific Gravity
Publication/ Report Number:
FHWA/MS-DOT-RD-13-245 ; MS-DOT-RD-13-245
FHWA/MS-DOT-RD-13-245 ; MS-DOT-RD-13-245 Less -
Resource Type:
Tech Report
Geographical Coverage:
Mississippi
Corporate Publisher:
Mississippi. Dept. of Transportation
Abstract:
Designing hot mix asphalt (HMA) that will perform for many years is a complex balancing act of selecting an

appropriate design asphalt binder content that is sufficiently high to provide durability but not so high as to lead

to rutting problems. One of the factors that has to be considered during the design of HMA is the absorption of

asphalt by aggregates. Most all aggregates used in the production of HMA have some absorptive characteristics.

The objective of this project was to evaluate asphalt absorption through the production and construction process.

In order to accomplish this objective, six on-going HMA construction projects were visited and HMA sampled.

The HMA was sampled from four locations through the production and construction process, including: the slat

conveyor prior to the mix being placed in the silo, trucks prior to transportation, the paver, and the compacted

HMA layer (cores). Laboratory testing was conducted on these samples to evaluate the amount of asphalt that was

absorbed by the aggregates throughout the production and construction process.

Based upon the results of testing, it was concluded that asphalt absorption continues from the production process

through the construction process. Sample obtained from the slat conveyor and the truck had similar average

asphalt absorption values, while the paver and core samples also had similar average asphalt absorption values.

However, the asphalt absorption at the paver and core locations were significantly higher than the other two. This

suggested that most of the absorption took place during mix transportation to the job site. It was attempted to

compare the amount of asphalt absorption that took place during mix design (based upon the job mix formula) to

the amount of asphalt absorption that took place during the production and construction process; however, this

attempt was not successful. Generally, the amount of asphalt absorption in the field was much higher than that

shown on the job mix formulas.


Format:
PDF
Funding:
SS-245
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:bd7c673c4b8a2f4e0891cb01f8e3bf7e98de92310e3adace6a77bf811955ab40
Download URL:
https://rosap.ntl.bts.gov/view/dot/27480/dot_27480_DS1.pdf
File Type:

Supporting Files

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