Evaluation of ozone for preventing fungal influenced corrosion of reinforced concrete bridges over the River Nile, Egypt

Abstract

Fungal influenced corrosion (FIC) of some corroded sites in three selected bridges [Embaba bridge (E-bridge), Kasr al-Nile-bridge (K-bridge) and University bridge (U-bridge)] located over the River Nile in Egypt were investigated. Six fungal species, belong to 12 fungal genera, were isolated from the corroded reinforced concrete of the three tested bridges. Fourier transform infrared spectroscopy (FTIR) was screened for the most dominant fungal species (Fusarium oxysporium) which showed in all tested bridges that indicated the presence of amine group accompanied with polysaccharides contents. FIC of the most deteriorated bridge (K-bridge) was documented with FTIR. The association of fungal spores with corrosion products was recorded with scanning electron microscope (SEM). Evaluation of ozone for preventing FIC of the K-bridge was carried out by recording the corrosion rate and the corresponding inhibition efficiency (IE%). No mycelial growth with 100% IE was observed at 3 ppm ozone concentration after 120 min exposure time. With longer duration of ozone exposure, the membrane permeability of F. oxysporium was compromised as indicated by protein and nucleic acid leakages accompanied with lipid and tryptophan oxidation. The total intracellular and extracellular proteins of F. oxysporium were run on sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) indicated the increasing of the supernatant protein on the expense of the cellular protein bands with extending ozone exposure time (0-80 min).

Vitex agnus castus plant extract as Safe corrosion inhibitor for carbon steel 1018 in 1M hydrochloric acid

“…The shifting wave numbers and the new bond formation that appeared previously in (Table 6) through the functional groups of VAC inhibitor on the metal surface supporting the interaction between the active constituents of VAC inhibitor and the metal surface. The presence of extract components that containing nitrogen & oxygen heteroatoms together with Л electron clouds over benzene rings and other double and triple bonds finally confirmed that, those donor atoms and bonds act as active centers that suppresses the redox reaction by making a protective film from VAC solution through its mixed nature in adsorption so as to, inhibit severe corrosion which takes place with 1M HCl on the CS 1018 surface [56][57][58][59][60][61] .…”

New data on relevant ancient Egyptian wooden artifacts: Identification of wooden species and study of the state of conservation with multidisciplinary analyses

“…(II) Decrease in the intensity band of water absorption around (1,640 cm −1 ) and decrease in O‐H stretching band around (3,300–3,400 cm −1 ); this was due to the water loss and the dry storage conditions. (III) Decrease in C=C stretching band around (1,508 cm −1 ) due to the loss of lignin according to fungal degradation (Geweely, 2011; Kubovský et al, 2020). (IV) Decrease in C‐O‐C stretching bands around (1,160 cm −1 ); this indicates the advanced cellulose chain breaking and the depolymerization occurrence (Kubovský et al, 2020).…”

Alkyd based water-reducible anticorrosive paints and their antifungal potential

“…Filamentous fungi are known to highly biodeteriorate materials [62]. These fungi have an invasive growth that many times manages to break the material on which they grow and at the same time release large amount of acids that favour corrosion processes [63]. Besides, Aspergillus as is one of the most common genera associated with biodeterioration of coatings and paints [64].…”