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Microbial Deterioration of Asphalt Materials and Their Biochemical Changes during Stripping Process; Final research rept. Jul 95-Sep 98
| 题名： | Microbial Deterioration of Asphalt Materials and Their Biochemical Changes during Stripping Process; Final research rept. Jul 95-Sep 98 |
| 作者： | Chang, F. H. |
| 关键词： | Asphaltic concretes; Microorganisms; Degradation; Biodeterioration; Tensile strength; Tests; Marshall method; Biochemistry |
| 摘要： | Chemical analysis, enumeration of heterotrophic microorganisms and asphalt degraders, metabolites produced by asphalt degraders, and tensile strength were assayed after Marshall pucks had been buried for 3, 7, 12, and 23 months in soils that were held in 20-gallon aquarium tanks and maintained at 30, 60, and 90 percent water holding capacities. Good correlation was found between loss of hydrocarbons in asphalt materials and reduction of tensile strength of Marshal pucks. Total hydrocarbon (percentage) in Marshall pucks that were buried in soils was less than those in control and fresh puck samples. The study confirmed that asphalt samples buried in soils that were maintained at 60 percent water holding capacity for 23 months had significantly more asphalt degraders and had undergone most severe biodegradation. GC, HPLC, MS, and IR chromatographs show that major peaks of biochemicals and metabolites almost disappeared in most asphalt samples. The higher visual stripping and broken aggregate percentages also were found in Marshall pucks that had been treated under the same environmental conditions. The study also confirmed that under optimum environmental conditions, microorganisms caused significantly more damage to asphalt pavement in all instances. Therefore, microbial degradative activities are considered major mechanisms to stripping process of asphalt pavement. |
| 总页数： | 106p |
| 报告类型： | 科技报告 |
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