Chip Seal Best Practices (2005) / Chapter Skim
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Pages 19-24
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From page 19... ...
As evident by the proportion of international responses 20 totaling more than 100%, international agencies seem to prefer a mix of unit-price and lump-sum contracts, and they have also contracted with design–build, whereby the chip seal contractor is responsible for both the design and the construction. The greater reliance on lump-sum contracts by international respondents is significant when one considers that all of those nations have developed their own chip seal design methodologies that are based on a much more detailed set of engineering measurements than those used in either the McLeod or the Kearby design methods.
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From page 20... ...
The British have incorporated an element of risk management into their chip seal design process that relates to the season in which the chip seal will be placed. Figure 19 is taken from Road Note 39 and illustrates this approach to selecting the proper timing within the chip seal season for construction.
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From page 21... ...
The same phenomenon is found with state DOTs that do not routinely use chip seals as part of their PM program. The smaller dollar value of projects within these agencies may isolate them from attracting qualified contractors.
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From page 22... ...
. New Zealand also has many of the environmental challenges faced in the northern United States and Canada in its mountainous areas, where maintenance chip seals installed on top of two- or three-course surface treatments must be resistant to snowplowing (Owen 1999)
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From page 23... ...
The survey responses noted that the most common warranty period for chip seals projects is 1 year. Of the 16 international agencies that have warranty requirements, all but the Yukon Territory of Canada responded that their warranty periods were 1 year in duration.
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From page 24... ...
Research on the Michigan experience noted that "The final results gave contractors greater flexibility [emphasis added] in selecting the materials and application methods used for warranted surface treatments" (Galehouse 1998)
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