Details:

Creators:
Soucie, Timothy
Corporate Creators:
Maine. Dept. of Transportation. Transportation Research Division
Subject/TRT Terms:
[+]
Aggregates Binders Mix Design Pavements Rutting Stone Matrix Asphalt Superpave
Publication/ Report Number:
42806
Resource Type:
Tech Report
Geographical Coverage:
Maine
Corporate Publisher:
Maine. Dept. of Transportation
Abstract:
In September 2003 the Maine Department of Transportation used stone matrix asphalt and Superpave to

renovate two intersections in South Portland, Maine. The experimental placement of stone matrix asphalt

(SMA) and Superpave with modified binder was a part of pavement project STP-8724(00) X. The

primary focus of this experiment is to look at the rutting resistance of SMA versus Superpave with

modified binder.

SMA mixtures consist of a large coarse aggregate content, fine aggregate, high filler content, asphalt

cement with or without a modifier and usually a cellulose or mineral fiber. These mixtures contain a large

coarse aggregate content (approximately 70 percent) and enough fine aggregate to help fill the voids in

the coarse aggregate. The strength of this mix is gained from stone on stone contact. This mix is designed

to have 3-4 percent air voids, and it has a relatively high asphalt content due to the high amount of voids

in the mineral aggregate. The mix contains a high filler content (approximately 10 percent passing the No.

200 sieve), and it typically contains a polymer in the asphalt cement or fiber (cellulose or mineral) in the

mixture to prevent drainage of the asphalt cement. This mixture has a surface appearance similar to that of

an open graded friction course, however it has low in-place air voids similar to that of a dense graded

HMA. The high asphalt content produces a mixture that is easily compacted and that should be durable.

If the asphalt content is excessive it will tend to push the aggregate apart and prevent stone on stone

contact. An asphalt content that produces 3-4 percent air voids in laboratory compacted samples is

desirable.

The intersections are at the junction of Route 1 and Turnpike Spur (703) and the junction of Route 1 and

Westbrook Street. The pre-existing pavement conditions had moderate rutting and cracking. The goal of

the experiment is to compare how the SMA and Superpave perform relative to each other.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:dfe9fb9fd60479bfd5794e7eaeaabe973f6ae4b85e98ffa71d8ad62581e210d4
Download URL:
https://rosap.ntl.bts.gov/view/dot/28469/dot_28469_DS1.pdf
File Type:

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