Construction and Maintenance Practices for Permeable Friction Courses (2009) / Chapter Skim
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Pages 55-64
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From page 55... ...
Metering and introduction of asphalt binder into the mixture may be done by any C H A P T E R 7 Construction of Permeable Friction Courses
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From page 56... ...
Most PFC mixtures will require the use of both a fiber and a modified asphalt binder to minimize draindown potential and improve durability. Draindown testing conducted during mix design should provide an indication of draindown potential and the needed stabilizing additive(s)
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From page 57... ...
For the first method, the hot-mix producer takes delivery of the modified asphalt binder and meters it into the PFC mixture in a traditional manner. Special storage techniques and/or temperatures may be required, as discussed previously.
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From page 58... ...
Elevated mixing temperatures increase the potential for damage to the asphalt binder due to rapid oxidation. This damage can lead to premature distress within PFC layers.
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From page 59... ...
Local experience with paving mixtures that include very stiff asphalt binders (polymer-modified) should be considered when specifying weather limitations.
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From page 60... ...
The survey indicated that a wide range of tack coat materials have been used with PFCs including emulsions and neat asphalt binder. 60 4 cm channel 1 2 1 4 cm 10 cm 2 soft shoulder 4 cm shoulder 1 2 hard shoulder slow lane 30 to 50 cm 2 to 2.5 cm 1 - Impervious Layer 2 - Porous asphalt Figure 39.
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From page 61... ...
. Without the use of auger extensions, the coarse aggregates tend to be pushed to the edge of the mat, leaving the asphalt binder behind.
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From page 62... ...
Static steel wheel finish rollers are used to remove any roller marks from the pavement surface. It is normal practice to mix a minimum amount of release agent with the water in the roller drum to prevent the asphalt binder from sticking to the drum.
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From page 63... ...
1.645) Implemented Specification Limits Asphalt Binder Content, % 0.24 0.39 ±0.45 Percent passing the 3/8 in.
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From page 64... ...
A cost analysis showed that fully recessed thermoplastic traffic markings was cost effective. During the survey, agencies were asked what materials were used for pavement markings on open-graded mixes.
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