Titania and Silica Nanoparticle-Modified Coatings for Cementitious Materials

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Titania and Silica Nanoparticle-Modified Coatings for Cementitious Materials

Author(s): Qingxu Jin, Marisol Faraldos, Ana Bahamonde, Behnaz H. Zaribaf, and Kimberly E. Kurtis

Publication: Special Publication

Volume: 335

Issue:

Appears on pages(s): 97-111

Keywords:

Self-cleaning; Air purification; TiO2; SiO22; NOx; Coating; Photocatalytic cementitious materials

Date: 9/20/2019

Abstract:

Due to the ubiquity of concrete in the urban environment and the upscaling of nanomaterial production, the incorporation of nanoparticles into cementitious materials has gained increased attention. This study compares the performance of various titania (TiO2) and silica (SiO2) nanoparticles-modified coatings, including their photocatalytic performance and the quality of their adhesion to the cementitious substrates. The photocatalytic performance with respect to air purification and self-cleaning are evaluated by nitrogen oxide (NOx) and methylene blue (MB) dye photodegradation, respectively. The results show that the Portland cement (OPC)-based cementitious materials exhibit greater photocatalytic efficiency than calcium aluminate cement (CAC)-based ones. It is proposed that the superior performance is due to a greater proportion of finer porosity and the presence of high surface area calcium silicate hydrates (C-S-H) in OPC-based cementitious materials. Interactions between coatings and cementitious substrates are examined through wettability and adhesion. The results show that the inclusion of silica layer can affect the interaction of coated cementitious surface with water, as well as the bond strength between coating and cementitious substrate.




  

Please enter this 5 digit unlock code on the web page.