United States Department of Transportation
i
Effectiveness of anti-strip agents in asphalt mixtures.
-
2012-07-01
[PDF-2.73 MB]
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Corporate Publisher:
-
Abstract:Since the late 1970s there has been much research performed to better understand the stripping phenomenon in asphalt mixtures.
As a result, there have been changes in both materials and technology over the past 30 years to improve the resistance to moisture
damage and the ability to test for performance under adverse moisture conditions. Due to the changes in materials and technologies
related to the development and improvement of anti-strip agents, this research study was conducted to evaluate the effectiveness of
current anti-strip agents used in hot mix asphalt pavements.
One purpose of the project was to evaluate anti-strip agents with a variety of aggregates and mix types. Three granite sources
were used: one does not have a history of stripping, one is a known stripping aggregate, and the other has used both hydrated lime
and liquid additive in the past in order to meet tensile strength requirements. All granite sources were used in both 12.5 mm surface
mixture and 25 mm base mixture. In addition, a limestone source was used in the 25 mm analysis to determine whether liquid
antistrips may result in better performance than hydrated lime. Limestone was used only in the 25 mm mix because it is not
typically used in surface mixtures due to a tendency to polish under traffic.
Secondly, the past field performance of Georgia’s mixes designed with hydrated lime to the performance of Georgia’s mixes
designed using liquid anti-strip agents was evaluated. Therefore, part of the study involved identifying projects with similar age,
aggregate source, and mix type in order to make comparisons of performance for mixtures with liquid anti-strip with similar
projects that used hydrated lime.
Thirdly, a field test section was constructed where three different anti-strip agents were used in a conventional Superpave
surface mixture. This was done on a typical mill and inlay project.
A final objective involved conducting a series of laboratory performance test comparisons using different aging periods to make
long-term comparisons of the effectiveness of hydrated lime to liquid and Warm mix anti-strip additives.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
