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Introductory technical guidance for civil engineers and construction managers interested in surface treatment maintenance of street and highway pavement. Here is what is discussed: 1. SPRAYED ASPHALT SURFACE TREATMENTS 2. BITUMINOUS SURFACE TREATMENT 3. DOUBLE BITUMINOUS SURFACE TREATMENT 4. ASPHALT SLURRY SEALS AND MICROSURFACING
Aggregate loss in asphalt surface treatments has been a major problem in Alaska. A study completed in 1982 entitled "Performance of Bituminous Surface Treatments" recommended specification changes. Most important of these was the adoption of the McLeod design method and limiting the construction season. The project reviewed these recommendations by constructing test sections. The McLeod design method provides an excellant starting point for asphalt and aggregate spread rates. It is further recommended that the percent passing the No. 200 sieve be reduced to 0.5 percent. A survey of seal coating practices and philosophies was also made. Most states feel that surface sealing is economically desirable. Maintenance funds are normally used.
Introductory technical guidance for civil engineers and construction managers interested in surface treatment maintenance of street and highway pavement. Here is what is discussed: 1. SPRAYED ASPHALT SURFACE TREATMENTS 2. BITUMINOUS SURFACE TREATMENT 3. DOUBLE BITUMINOUS SURFACE TREATMENT 4. ASPHALT SLURRY SEALS AND MICROSURFACING
This report describes a field study of a multicourse asphalt emulsion chip seal, designated as a modified single seal. The treatment, already used in North Carolina, consists of an application of emulsion and coarse aggregate followed by another application of emulsion and a final layer of fine aggregate. Sixty sections were placed in three districts in 1986-88, totaling approximately 400 lane-km of surfacing. These sections were evaluated periodically by a team of local operations personnel and research staff. The operations personnel also provided estimates of service life. for conventional single chip seals, used for a cost-benefit analysis. The modified seals performed better and were more cost-effective than conventional surface treatments. Also, the hazard of broken windshields caused by loose aggregate was virtually eliminated on the modified seal treatments. The report includes recommendations for ensuring that the final product is of high quality. The recommendations include using a pilot vehicle, limiting the speed of construction traffic, using clean dry blot aggregate, applying the coarse aggregate not more than one stone thick, and using the proper nozzles on the asphalt distributor.