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POTHOLE REPAIR RESEARCH The Strategic Highway Research Program (SHRP) PROJECT H106 evaluated the effectiveness of materials, procedures and equipment used for performing pothole repair. These four (4) distresses define the evaluation of pothole repair patches:
POTHOLE REPAIR TESTS*
*SAS® Statistical Package FINDINGS When compared directly, the throw-and-roll placement method is a viable option for repairing potholes, particularly in adverse weather conditions. This procedure should only be considered if good-quality cold mixes are used. When comparing costs of patching operations, the performance or service life should be also be considered. The initial cost per ton of purchasing a material is insignificant when compared to the labor, equipment and user delay costs incurred by patching operations. Poorly performing materials can further increase the labor, equipment and user delay costs by requiring a great deal of repatching. Spray-injection patching devices are a viable way to repair potholes in asphalt pavements and are capable of producing good patches when good-quality, compatible aggregate and binder are used. Spray-injection devices are limited by the quantity of the materials used and by the skill of the operator using the device. Poor-quality and incompatible materials will not be improved simply by the use of a spray-injection device. Patches placed under severe winter conditions should not be expected to perform as well as those placed in more temperate, spring-like conditions. The most critical period in the service life of a pothole patch appears to be the first few weeks, when the material is setting. Excessive moisture and cold temperatures can impede the setting of the repair materials, providing more opportunity for the repairs to fail. Winter patching operations should be limited to either throw-and-roll or spray injection to reduce the amount of time that workers need to be in traffic, thereby reducing the risk to both the maintenance crew and the traveling public. The greatest failure mode was the reveling of the material out of the pothole and it occurred within days of the installation. Therefore, preliminary testing should be done to ensure the compatibility of the aggregate and binder that will be used to avoid premature failures and repatching operations. Fossil Works, Incorporated is the
manufacturer of DARM, Durable Asphalt Repair Mix. For more information
contact Fossil Works, Incorporated at
1-877-3 FOSSIL (336-7745), FAX 702-293-7898, info@fossilworksinc.com. For more information on DARM®: DARM® Specifications DARM® Material Safety Data Sheet (MSDS) is available upon request. |
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