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- W655255768 abstract "Major types of bituminous pavement distress were rutting, cracking (longitudinal, transverse, and alligator) and stripping. The transverse cracks were 1/8 to 3 wide. Cuts made perpendicular to them revealed inverted trough shaped deteriorated areas. The central portion of these were rubble-like. A soft loosely bound asphaltic concrete was present between the rubble and sound materials. The rubble and loosely bound material contained bacteria. The deterioration lessened upward from the pavement-soil interface. The soil appears to be the prime source of the bacteria. Most of the bacterial cells were sausage shaped with polar flagellation. They appeared to belong to the genus Pseudomonas which is a known user of asphaltic hydrocarbons. Cocci type bacteria and a virus were also noted. No significant changes were noted in the condition of asphalt coating on limestone and chert strips that were partially immersed in a culture solution innoculated with an active bacterial culture but the cultures grew quite well on the asphalt. Use of a bactericide in pavements to control microbial activity was ruled unwise since it has a strong potential for polluting the environment and creating bacterial strains that could be highly resistant to other chemical biocides. (Some of the bacteria are human pathogens.) Increasing the density of some asphaltic concrete and strengthening the bond between aggregate and asphalt are considered as the preferred alternatives to using chemical biocides. Anything to reduce pavement cracking would help. Adding lime to asphalt mixes may be one effective means of improving aggregate-asphalt bond and controlling biodeterioration. Lime stabilization of soils under asphalt pavements may provide an added protection against bacterial attack by rendering the soil more hostile to bacterial habitat. Full depth hot mix recycling would be more effective than partial depth recycling in retarding bacterial decay at cracks." @default.
- W655255768 created "2016-06-24" @default.
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- W655255768 date "1987-08-01" @default.
- W655255768 modified "2023-09-24" @default.
- W655255768 title "BACTERIA AND ASPHALT STRIPPING. FINAL REPORT" @default.
- W655255768 hasPublicationYear "1987" @default.
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