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In vitro microbiologically-induced concrete corrosion behavior of Ag^(+) loaded zeolite-polyurethane coating for concrete sewer applications

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Journal of Central South University 2022年第9期29卷 3171-3185页

作者： Asma KAMARUL ASRI Safaa N.SAUD Esah HAMZAH Zaharah IBRAHIM Faculty of Mechanical Engineering Universiti Teknologi MalaysiaSkudai 81310Malaysia Faculty of Information Sciences and Engineering Management&Science UniversityShah Alam 40100Malaysia Faculty of Bioscience and Bioengineering Universiti Teknologi MalaysiaJohor 81310Malaysia

Microbiologically-induced concrete corrosion(MICC)refers to chemical reactions between biologically produced sulphuric acid and with hydration products in the hardened concrete paste,resulting in an early reduction of strength,deterioration,and very severe circumstances,structural *** paper explores the bactericidal characteristics of cementitious materials with surface coated with modified *** zeolite-polyurethane coating incorporated with silver was studied in environments inoculated with *** bacteria for 8 consecutive *** antibacterial characteristics were evaluated in terms of pH,optical density(OD),sulphate production and bacteria count to determine the effectiveness of the zeolite-polyurethane coatings in environments inoculated with *** bacteria producing the sulphuric *** results revealed that the samples incorporated with silver modified zeolites generally showed antibacterial performance(regardless of the zeolite type)compared with unmodified polyurethane *** was evaluated by the lack of bacteria attachment and the deformed microcolonies on the sample surface,lag in pH reduction,increase in OD,and sulphate *** silver zeolites gained their antibacterial performance from the release of silver ions(Ag^(+))when the sample comes into contact with aqueous *** results in the inhibition of cell functions of the bacteria and subsequently causes cell damage.

关键词： microbiologically-induced corrosion cement zeolite a.thiooxidans silver ions

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