Chip Seal Best Practices (2005) / Chapter Skim
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Pages 32-38
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From page 32... ...
Most of the asphalt distributor tanks used for chip seal work hold from 1,000 to 4,000 gal of liquefied asphalt. They should be equipped with baffles to prevent pressure surges resulting from the asphalt sloshing in the tank when starting and stopping.
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From page 33... ...
Chip seal projects require either double- or triple-lap coverage, as shown in Figure 32. The advantage of using double or triple lapping is that 63% 37% 63% 37% 88% 12% 0% 20% 40% 60% 80% 100% United States Canada AU, NZ, UK, SA Yes No FIGURE 29 Respondents requiring computerized distributors.
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From page 34... ...
A self-propelled spreader, equipped with a receiving hopper in the rear, belt conveyors to carry the aggregate to the spreading hopper, and a spreading hopper with adjustable discharge gates, is generally specified for most chip seal projects in North America. A discharge roller that assists in ensuring uniform transverse application rates is located at the bottom of the discharge gate.
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From page 35... ...
Steel-wheeled rollers used for surface treatments typically weigh between 3 and 6 tons, and thus are comparatively lighter than those used in asphalt paving (Seal Coat .
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From page 36... ...
This piece of equipment attempts to combine the advantages of both roller types in a single machine. SWEEPING EQUIPMENT There are two main tasks for sweeping on a chip seal project: cleaning the existing road surface of dust and foreign materials before placing the chip seal and removing excess aggregate from constructed chip seals.
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From page 37... ...
The survey responses indicated that rubber-coated drums are commonly used on chip seals (known as surface dressings in British terminology) in the United Kingdom, and they are also used when required on sprayed seals in Australia.
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From page 38... ...
However, the findings of this portion of the study do result in several best practices with respect to chip seal equipment.
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