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Protective coatings with nano constituent materials

Title: Protective coatings with nano constituent materials
Author(s): Christos G. Papakonstantinou
Paper category : conference
Book title: NICOM 2: 2nd International Symposium on Nanotechnology in Construction
Editor(s): Y. de Miguel, A. Porro and P.J.M. Bartos
Print-ISBN: 2-912143-87-X
e-ISBN: 2912143888
Publisher: RILEM Publications SARL
Publication year: 2006
Pages: 321 - 328
Total Pages: 8
Nb references: 7
Language: English

Abstract: Epoxies and other organic matrices have been utilized as protective coatings for infrastructure over several decades because they seal the surface of the concrete. Their main drawback is their inability to release vapor pressure buildup that causes damage in the concrete and delamination of the dried (epoxy) coatings. A new fireproof inorganic matrix based on Geopolymers has been developed for use as a coating material. It has already been used successfully to coat concrete and wood structural members. The results presented focus on the durability of these inorganic matrices that comprise the next generation of barrier and strengthening systems. They are less permeable than concrete thus slowing the flow of water through the weakened exterior surfaces. Vapor pressure is released because the matrices do not form a film. The matrix contains nano scale silica particles and hardeners. These nano particles penetrate and close small cracks on the concrete surface. In strengthening applications, the matrices form a strong bond between the surface of the concrete and the fiber reinforcement. Results on durability studies are presented in this paper. Tests were conducted both in the laboratory and in the field using bridge substructures.

Online publication: 2005-11-17
Publication type : full_text
Public price (Euros): 0.00

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