Bacteria and asphalt stripping. Final report, December 1983-August 1987
Major types of bituminous pavement distress were rutting, cracking (longitudinal, transverse, and alligator) and stripping. 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. 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.
- Research Organization:
- Kansas Dept. of Transportation, Topeka (USA). Bureau of Materials and Research
- OSTI ID:
- 6593550
- Report Number(s):
- PB-89-113492/XAB
- Resource Relation:
- Other Information: See also PB--85-103455
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
ASPHALTS
BIODEGRADATION
BITUMINOUS MATERIALS
PAVEMENTS
BACTERIA
CALCIUM OXIDES
HYDROCARBONS
LIMESTONE
MICROORGANISMS
PROGRESS REPORT
PSEUDOMONAS
REVIEWS
ROADS
ALKALINE EARTH METAL COMPOUNDS
BITUMENS
CALCIUM COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
DOCUMENT TYPES
MATERIALS
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OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
ROCKS
SEDIMENTARY ROCKS
TAR
020500* - Petroleum- Products & By-Products
360604 - Materials- Corrosion
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