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Short-term crack sealant performance and reducing bumps and transverse cracking in new hot mix asphalt overlays over crack sealants.
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    Interim Report; Sept. 2007-Sept. 2009.
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  • Abstract:
    This interim report is intended to provide preliminary information regarding the performance of crack sealants produced by three

    manufacturers during a two-year period in service in three pavements in Colorado. In addition, preliminary conclusions have been

    developed regarding the propensity of three of these sealants to contribute to bumps in new overlay hot mix asphalt. Results of

    performance evaluations made, to date, indicate that the crack sealants failed at a surprising rate after only one winter. However,

    subsequent performance surveys after twelve months and twenty-one months indicate a tendency for the sealants to heal. Routing the

    cracks prior to filling appears to provide the best performance when the filler is overbanded, and filling the cracks to within ¼ inch of

    the surface instead of flush with the surface or overbanding produced the poorest performance.

    Bumps accompanied by transverse cracking occurred over the crack sealants when a new hot mix overlay was placed after the crack

    sealants had been in service two years. The bumps and transverse cracks were exacerbated by utilizing steel rollers with vibration on

    breakdown of the hot mix asphalt overlay. The number of passes of the vibrating steel rollers further exacerbated the presence of the

    bumps and cracks. The same rollers used in static mode reduced the effect, and pneumatic rollers used for breakdown eliminated it.

    The ambient temperature and temperature of the substrate pavement during construction appears to have had little effect, as the same

    bumps and cracking occurred during vibratory breakdown after a small rain shower moistened the substrate pavement surface prior to

    the overlay hot mix asphalt placement.

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