Highway Maintenance Response Time Standards

DRAFTSingle Course Overlays including Liquid Asphalt TreatmentsWhen a pavement has been crack sealed two or more times and the surface hasbegun to develop secondary and tertiary cracking, crack sealing iscontraindicated. In this case a surface treatment covering the whole pavement isnecessary. Usually this requires a single course hot mix overlay. On some lowervolume pavements, chip seal can be an economical alternative to a single coursehot mix overlay. Typical sufficiency scores will be in the 6 to 7 range for thesetreatments. In certain cases, such as when the presence of road hardware orcurbs makes the addition of 40 mm of surface thickness impractical, liquidasphalt treatments such as microsurfacing or paver placed surface treatmentmay be desired. Warrants for these surface treatments include low severitycracking and infrequent corrugations, settlements, heaves, or slippage cracks.As indicated in the footnote to Table 1, single course overlays should not exceed70% of total resurfacings in each Region. Total resurfacings should place eachRegion on a 12 year paving cycle.Portland Cement Concrete Surfaced PavementsCrack Sealing and Joint ResealingPortland Cement Concrete Pavements typically do not age in quite the samemanner as Hot Mix Asphalt Surfaced Pavements, but what does happen is thatcracks develop either due to freeze-thaw cycles or due to loading. Joint sealingmaterial does age and eventually wears out. The typical life of the siliconesealants and the compression seals commonly used in the past is about eightyears. These pavements should be sealed regularly to keep water out of thesubgrade and from corroding load transfer devices.Shoulder TreatmentsUsually constructed of hot mix asphalt, shoulders abutting Portland CementConcrete Pavements deteriorate in the same manner as Hot Mix Asphalt7