Pseudomonas and Bacillus are dominant microorganisms to widely distributes in asphalt pavement structure. Microbial degradation leads to asphalt aging, and causes its performance deterioration, reducing the durability of asphalt pavement. To better understand the degradation behaviors of dominant microorganisms on asphalt, and reveals their microbial aging mechanisms on asphalt, the effects of microbial degradation on micromorphology, chemical functional group, component and microstructure of asphalt were discussed. Results indicate that main damages of microbial degradation start from asphalt surface and then permeates into its interior. Microorganisms degrade light components of asphalt as nutrients and decompose them into CO2 and H2O through oxidation reactions, but exhibit limited degradation ability to macromolecular components. Microbial degradation causes the content changes of asphalt components, altering the colloidal structure of asphalt. Microorganisms destroy the continuity of asphalt surface and increase surface roughness of asphalt. This study provides a new insight into microbial aging mechanism of asphalt.

中文翻译：

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沥青路面结构中微生物对沥青的降解行为


假单胞菌属 （Pseudomonas） 和芽孢杆菌属 （Bacillus） 是广泛分布于沥青路面结构中的优势微生物。微生物降解导致沥青老化，并导致其性能恶化，降低沥青路面的耐久性。为了更好地了解优势微生物对沥青的降解行为，揭示其对沥青的微生物老化机制，讨论了微生物降解对沥青微观形貌、化学官能团、组分和微观结构的影响。结果表明，微生物降解的主要危害始于沥青表面，然后渗透到沥青内部。微生物将沥青的轻质成分降解为营养物质，并通过氧化反应将其分解成 CO2 和 H2O，但对大分子成分的降解能力有限。微生物降解导致沥青成分的含量发生变化，从而改变沥青的胶体结构。微生物破坏了沥青表面的连续性，增加了沥青的表面粗糙度。本研究为沥青的微生物老化机制提供了新的见解。