Abstract
This work presents the performance of a SiO2-epoxy nanocomposite lining for the anticorrosion of the concrete structures in sewer networks. Nanocomposite lining on the concrete substrate surface of the 15 phr (part per hundred epoxy resin) amine-cured epoxy polymer containing 3.0 phr of nano-SiO2 was prepared by intercalating epoxy into the SiO2 via direct mixing process. The silica exfoliation was monitored by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The barrier feature of epoxy the base nanocomposite against water and sulfuric acid solution was evaluated. The results showed that the nanocomposite lining was of a great barrier against these corrosive environments due to the intercalation and exfoliation caused by the dispersion of the SiO2 nanoparticles into the epoxy matrix. The rate of the H2SO4 into the nanocomposite lining was also investigated by measurement of the depth of the sulfur element penetrated layer using the coupled Scanning Electron Microscopy (SEM)/Energy dispersive X-ray spectrometer (EDS). Deterioration behavior of the adhesion strength of the nanocomposite lining was studied. The nanocomposite lining shows a significant improvement of bond strength in comparison to the neat epoxy lining. The durability of the nanocomposite lining adhesion when the lining systems exposed to water and the sulfuric acid solution is also improved significantly.
Highlights
Nowadays, as a part of living standards, sewer systems are implemented for the collection and transportation of wastewater to treatment facilities
Hydrogen sulfide formed by sulfate-reducing bacteria (SRB) is released to the sewer air, absorbed/adsorbed into the moisture layer on the concrete walls exposed to air, it was oxidized to sulfuric acid by the activity of sulfide-oxidizing bacteria (SOB), corroded concrete [1]
This study reports our findings on the degradation of epoxy-silica nanocomposite lined on concrete substrate exposure to sulfuric acid solution for the purpose of the anticorrosion of sewerage concrete
Summary
As a part of living standards, sewer systems are implemented for the collection and transportation of wastewater to treatment facilities. Most of these piping systems are constructed of concrete since concrete is compatible with the environment and the cost-effectiveness. Sewer concrete structures are rapidly degraded because of the acidic environments generated by bacterial activities [3]. This degradation is well-known as microbially induced concrete corrosion [4,5,6]. The sulfuric acid reacts with the silicate and carbonate compounds to form gypsum via the following reactions: H2SO4 + CaO:SiO2:2H2O ⟶ CaSO4 + SiðOHÞ4 + H2O H2SO4 + CaCO3 ⟶ CaSO4 + H2CO3
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
