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Advanced spectroscopic and microscopic insights into cement biodeterioration in sulfur-rich sewer systems
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2025-01-24 , DOI: 10.1016/j.cemconcomp.2025.105955
Janette Ayoub, Tony Pons, Marielle Guéguen Minerbe, Guilhem Simon, Gwénaël Gouadec, Sabrina Guérin, Vincent Rocher, Marc Offroy, Mario Marchetti

The biodeterioration of cementitious materials within sewer networks remains a critical problem that compromises the structural integrity and lifespan of these infrastructures essential to water treatment. This study pioneers the use of micro-Raman spectroscopic mapping, coupled with chemometric tools, to investigate the impact of high H2S levels and bacterial activity on high-resistance cementitious matrices (CEM V and CAC) over a four-year period. The research aims to assess how severe environmental conditions affect these materials and identify the resulting phases formed. By utilizing this pioneering approach, the study reveals notable differences in behavior between cement types, with the presence of gypsum, bayerite, native sulfur, and CaCO3 polymorphs in the altered layers. Raman spectroscopy, combined with chemometrics techniques, facilitated the identification of distinct microstructural zones within the specimens. Complementary SEM-EDS analysis provided consistent insights into element distribution and micro-texture changes, confirming degradation mechanisms and highlighting the material's resistance or susceptibility to aggressive environments.

中文翻译:


对富硫下水道系统中水泥生物劣化的先进光谱和微观见解



下水道网络中胶凝材料的生物劣化仍然是一个关键问题,它损害了这些对水处理至关重要的基础设施的结构完整性和使用寿命。本研究率先使用微拉曼光谱映射与化学计量学工具相结合,以研究高 H2S 水平和细菌活性对四年内高电阻水泥基体(CEM V 和 CAC)的影响。该研究旨在评估恶劣的环境条件如何影响这些材料,并确定由此形成的相。通过利用这种开创性的方法,该研究揭示了水泥类型之间行为的显着差异,在蚀变层中存在石膏、拜耳石、天然硫和 CaCO3 多晶型物。拉曼光谱与化学计量学技术相结合,有助于识别标本内不同的微观结构区。互补的 SEM-EDS 分析提供了对元素分布和微观织构变化的一致见解,确认了降解机制并突出了材料对腐蚀性环境的抵抗力或敏感性。
更新日期:2025-01-29
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