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This report was prepared to aid the facilities engineer in prescribing and constructing slurry seals. The report identifies the potential areas of slurry seals application and discusses material requirements, field construction processes, and techniques to assist the facilities engineer in placing good quality slurry seals. A summary of a recommended laboratory design method for proportioning the materials of the slurry seal mixture and a modified version of construction guide specification CE-807.23 for emulsified asphalt slurry seal surface treatments are also presented herein.
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 411: Microsurfacing explores highway microsurfacing project selection, design, contracting, equipment, construction, and performance measurement processes used by transportation agencies in the United States and Canada. Microsurfacing is a polymer-modified cold-mix surface treatment that has the potential to address a broad range of problems on today's highways --
This report describes the placement and early performance of experimental test sections on which No. 8 modified slurry seal and precoated No. 8 chip seal surface treatments were placed. From observations made during the installation and the performance after one year, it is concluded that the No. 8 modified slurry seal treatment has good potential but that use of the No. 8 chip seal treatment is not feasible.
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.
TRB's National Cooperative Highway Research Program (NCHRP) Report 680: Manual for Emulsion-Based Chip Seals for Pavement Preservation examines factors affecting chip performance, highlights design and construction considerations, and explores procedures for selecting the appropriate chip seal materials. The report also contains suggested test methods for use in the design and quality control of chip seals. Appendices A to J of NCHRP Report 680 provide further elaboration on the work performed in this project--