Microsurfacing (2010) / Chapter Skim
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Pages 42-47
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From page 42... ...
An example of a method specification for microsurfacing equipment specifications was found in the Georgia DOT manual and is as follows: • Blend the paving mixture using a self-propelled microsurfacing mixing machine that is: – A continuous flow mixing unit. – Able to accurately deliver and proportion the aggregate .
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From page 43... ...
Figure 23 shows how a mobile support unit replenishes the self-propelled continuous mixing machine as it moves down the road applying microsurfacing. The mixing process is tied to the application rate of the mix.
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From page 44... ...
One-half the Canadians calibrate in the field, whereas three Canadian agencies do not specifically require calibration of any sort. Preparing Test Strips Even with calibration there is the possibility that the materials in use could measurably impact the design application rate (Wood 2007)
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From page 45... ...
The test strip will be Asphalt Emulsion Calibration Procedure Aggregate Calibration Procedure 1. Empty machine of all aggregate.
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From page 46... ...
Minnesota DOT also adds: "Carry normal traffic on the test strip within one hour after application, without any damage occurring. The Engineer will inspect the completed test strip after 12 hours of traffic to determine if the mix design is acceptable" (Minnesota DOT 2009)
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From page 47... ...
in length be constructed and accepted allows the agency and the contractor to ensure that the equipment is properly calibrated and that any workmanship issues are resolved before full-scale microsurfacing production. If the microsurfacing is scheduled to occur after dark, the test strip is to be constructed after dark.
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