Microsurfacing (2010) / Chapter Skim
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Pages 28-35
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From page 28... ...
Previous research has shown that contract policies, procedures, and regulations directly affect construction costs (Ohio DOT 2007; Erwin and Tighe 2008)
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From page 29... ...
all responding agencies outsource their microsurfacing work, which leads to the conclusion that most of the U.S. and Canadian agencies do not believe they have adequate competition among qualified microsurfacing contractors for their programs.
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Table 24 is an example of the supplementary specification that the Ohio DOT (2008) uses for its microsurfacing projects.
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From page 31... ...
Good British Columbia 1 year Standard construction warranty Good Manitoba 2 years Performance specification includes warranty provision Excellent Nova Scotia 2 years Standard construction warranty Good Ontario 2 years Flushing, raveling Good Quebec 1 year Standard construction warranty Good Saskatchewan 1 year Standard construction warranty Good TABLE 23 SUMMARY OF WARRANTIES REPORTED IN THE SURVEY TABLE 24 SUMMARY OF OHIO DOT MICROSURFACING WARRANTY SPECIFICATION Distress Type Threshold Level (per 500 SF of surface area) Description Bleeding/ Flushing 300 SF (28 SM)
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From page 32... ...
The three that were lower than that limit were the Ohio DOT at 40°F (4°C) and Michigan DOT and FLHD at 45°F (7°C)
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From page 33... ...
Figure 15 shows the distribution if the respondents are split between northern and southern climates. It reveals that microsurfacing is more intense in the shorter northern season, whereas the southern states are able to spread their program out over a several more months.
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From page 34... ...
Given that microsurfacing projects usually are limited to a defined area of pavement, quantity surveys are fairly straightforward and not highly variable. Thus, lump sum contracts, including the total cost of the project with mobilization and traffic control, could be used without the agency incurring a substantial cost increase.
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From page 35... ...
• The concept of requiring warranties on microsurfacing projects was found to be less onerous than for other pavement work because most agencies require the contractor to furnish the job mix formula. • Few agencies require microsurfacing contractors and agency personnel to complete microsurfacing training and/or a certification program.
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