| Asphalt Rubber Technology Information Center |
Los Angeles County Department of Public Works Asphalt Rubber Chip Seal with Warm Mix Additive
Demonstration Project
Author(s):
Dragos Andrei, Erik Updyke, R Gary Hicks, Ding Cheng
Origin:
California
Date:
September, 2010
Categories:
Warm Mix
Key Words:
chip seal, warm mix, asphalt rubber, spread application
Summary:
The Los Angeles County Department of Public Works placed an asphalt rubber warm mix chip seal demonstration on
Smith Avenue in the unincorporated community of Acton on August 26, 2010. This was the second project of this type
placed in California in the summer of 2010 by Intermountain Slurry Seal, Inc. The first was in the City of Roseville placed
in June 2010 and reported in the Center’s June newsletter. The placement temperature of the warm mix asphalt rubber
spray application used in LA County was 335°F, considerably lower than the application temperature of 400°F when no
warm mix additive is used. The additive supplied was manufactured by Engineered Additives blended at 1.5 % by weight
of the asphalt rubber binder.
Observations included the following:
There appeared to be less smoke coming from the spray bar when using the warm mix additive than from around a
distributor equipped with a smoke reduction device observed with conventional asphalt rubber.
The viscosities were on the lower side, 1500 and 1700 centipoise, but were within the specification range.
When walking beside the distributor, perhaps 5 feet to the side, for over 50% of the project, the effect of smoke was not
felt. The smoke appeared to be white with a blue tint.
Overall, the project was considered a success.
Demonstration Project
Author(s):
Dragos Andrei, Erik Updyke, R Gary Hicks, Ding Cheng
Origin:
California
Date:
September, 2010
Categories:
Warm Mix
Key Words:
chip seal, warm mix, asphalt rubber, spread application
Summary:
The Los Angeles County Department of Public Works placed an asphalt rubber warm mix chip seal demonstration on
Smith Avenue in the unincorporated community of Acton on August 26, 2010. This was the second project of this type
placed in California in the summer of 2010 by Intermountain Slurry Seal, Inc. The first was in the City of Roseville placed
in June 2010 and reported in the Center’s June newsletter. The placement temperature of the warm mix asphalt rubber
spray application used in LA County was 335°F, considerably lower than the application temperature of 400°F when no
warm mix additive is used. The additive supplied was manufactured by Engineered Additives blended at 1.5 % by weight
of the asphalt rubber binder.
Observations included the following:
There appeared to be less smoke coming from the spray bar when using the warm mix additive than from around a
distributor equipped with a smoke reduction device observed with conventional asphalt rubber.
The viscosities were on the lower side, 1500 and 1700 centipoise, but were within the specification range.
When walking beside the distributor, perhaps 5 feet to the side, for over 50% of the project, the effect of smoke was not
felt. The smoke appeared to be white with a blue tint.
Overall, the project was considered a success.
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