On the incorporation of nano TiO2 to inhibit concrete deterioration in the marine environment

Zhen Li, Sufen Dong, Ashraf Ashour, Xinyue Wang, Vijay Kumar Thakur, Baoguo Han, Surendra P Shah

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

To develop high deterioration resistance concrete for marine infrastructures, two types of nano TiO 2(NT) including anatase phase NT and silica surface-treated rutile phase NT were incorporated into concrete. The fabricated NT modified concrete was then put into the marine environment for 21 months in this study. The effects and mechanisms of two types of NT on the deterioration of concrete in the marine environment were investigated from three aspects, including seawater physical and biological as well as chemical actions on concrete with NT. Under the seawater physical action, the exposed degree of coarse sand particles on the surface of control concrete is greater than that of concrete with NT. Owing to the microorganism biodegradation property of NT, the elimination and inhibition rates of concrete with NT on microorganisms can reach up to 76.98% and 96.81%, respectively. In addition, the surface biofilm thickness of concrete can be reduced by 49.13% due to the inclusion of NT. In the aspect of seawater chemical action, NT can increase the pH value inside concrete by 0.81, increase the degree of polymerization of C-S-H gel, and improve the interfacial transition zone between cement paste and aggregate in concrete. Compared to anatase phase NT, silica surface-treated rutile phase NT is more effective in improving the deterioration resistance of concrete in the marine environment. It can be concluded that incorporating NT can inhibit the deterioration of concrete in the marine environment.

Original languageEnglish
Article number135704
JournalNanotechnology
Volume33
Issue number13
Early online date5 Jan 2022
DOIs
Publication statusFirst published - 5 Jan 2022

Keywords

  • Concrete
  • Nano-titanium dioxide
  • Microorganism biodegradation
  • Mechanisms
  • Seawater deterioration resistance
  • concrete
  • microorganism biodegradation
  • nano-titanium dioxide
  • mechanisms
  • seawater deterioration resistance

Fingerprint

Dive into the research topics of 'On the incorporation of nano TiO2 to inhibit concrete deterioration in the marine environment'. Together they form a unique fingerprint.

Cite this