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5 Table 2.1. Preservation Treatment Use on High-Traffic-Volume Rural and Table 2.2. Preservation Treatment Use on Urban HMA-Surfaced Roadways High-Traffic-Volume Rural and Urban PCC-Surfaced Roadways Treatment Usage Treatment Usage Rural Urban Treatment (ADT >5,000 vpd) (ADT >10,000 vpd) Rural Urban Treatment (ADT >5,000 vpd) (ADT >10,000 vpd) Crack filling Extensive Extensive Concrete joint sealing Extensive Extensive Crack sealing Extensive Extensive Concrete crack sealing Extensive Extensive Slurry seal Limited Limited Diamond grinding Extensive Extensive Microsurfacing Moderate Moderate Diamond grooving Moderate Extensive Chip seals Moderate Moderate Partial-depth concrete Extensive Moderate Ultra-thin bonded Moderate Moderate patching wearing course Full-depth concrete Extensive Extensive Thin HMA overlay Extensive Extensive patching Cold milling and Extensive Extensive Dowel bar retrofitting Moderate Moderate overlay (i.e., load transfer Ultra-thin HMA overlay Limited Moderate restoration) Hot in-place HMA Limited Limited Ultra-thin bonded Limited Moderate recycling wearing course Cold in-place recycling Moderate Moderate Thin HMA overlay Limited Moderate Profile milling Moderate Moderate Note: Extensive = Use by 66% of respondents; Moderate = 33% to 66% usage; Limited = <33% usage. Ultra-thin whitetopping Limited Limited Note: Extensive = Use by 66% of respondents; Moderate = 33% to 66% usage; Limited = <33% usage. Table 2.3. Preservation Treatments Commonly Used on High-Traffic-Volume HMA-Surfaced Roadways Roadway Category An important element of the overall traffic level is the aver- age daily truck traffic (ADTT) or the percentage of the ADT Rural (ADT >5,000 vpd) Urban (ADT >10,000 vpd) that is made up of trucks. However, agencies did not report that truck traffic has a significant influence on preservation Crack fill Crack fill Crack seal Crack seal treatment selection. Thin HMA overlay Cold mill and overlay Cold mill and overlay Drainage preservation Drainage preservation Pavement Condition In selecting the right preservation treatment for a pavement, the condition of the existing pavement is important. Not only Table 2.4. Preservation Treatments Commonly Used is the overall condition important, but the specific distresses on High-Traffic-Volume PCC-Surfaced Roadways present on the pavement also impact the selection of the proper preservation treatment. It is rare to encounter a single pave- Roadway Category ment condition, so these guidelines have been structured such Rural (ADT >5,000 vpd) Urban (ADT >10,000 vpd) that the suitability of various treatments for combinations of pavement conditions has been considered, where possible. Joint seal Joint seal Although it is always important to apply preservation treat- Crack seal Crack seal Diamond grinding Diamond grinding ments at the right time to address the right condition(s), this Full-depth patching Full-depth patching is especially applicable to high-traffic-volume roadways. For Partial-depth patching Partial-depth patching example, if two roads of the same design are constructed to the Dowel bar retrofitting Dowel bar retrofitting Drainage preservation same standards under the same environmental conditions, it is expected that these roadways would perform identically