Abstract
Coating anticorrosive technology has been widely used in marine concrete structures, but there are some problems such as poor adhesion, lack of durability or environmental pollution. Tannic acid (TA) -aminopropyl triethoxysilane (APTES) coating has good adhesion, corrosion resistance and secondary reactivity, and has been widely used in biomedicine etc. fields. However, the feasibility of applying TA-APTES to concrete surface treatment remains to be studied. In this study, hydrophobic nanocomposite coating TA/APTES- hexadecyltrimethoxysilane (HDTMS) was prepared by coupling HDTMS with TA-APTES, and applied to concrete surface treatment. By water contact angle measurement (WCA), Coulomb charge experiment and scanning electron microscopy test, the effects of TA-APTES mixture content, mass ratio of TA to APTES and HDTMS concentration on the hydrophobic property and ionic permeability of coated concrete were investigated. The results indicated that TA/APTES-HDTMS coating prepared with 4.0 mg/mL TA-APTES mixture content, 2:1 mass ratio of TA to APTES and 7.0 % HDTMS solution concentration showed optimal improvement efficiency. In this case, the chloride transport properties and sulfate resistance of coated concrete were studied by chloride and sulfate natural diffusion tests, respectively. The results indicated that compared with uncoated concrete, coated concrete showed better and stable resistance to chloride ion and sulfate. In addition, the chloride transport models of both coated and uncoated concrete were established based on Fick’s Second Law. It was found that the chloride diffusion coefficient of coated concrete was similar to that of uncoated concrete, but the surface chloride content was significantly lower. Meanwhile, the lifetime of TA/APTES-HDTMS coating was evaluated based on the change of surface chloride content and compared with other research literature. Furthermore, by WCA and Coulomb charge experiment, it was concluded that the anti-abrasion property and acid-alkaline resistance of coated concrete were significantly improved. Finally, the cost-benefit analysis of TA/APTES-HDTMS coating and existing commercial coatings also illustrated the advantages of TA/APTES-HDTMS coating.
Sign-in/Register to access full text options 
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
