The failure of a reinforced concrete member strengthened with fiberreinforced polymer (FRP) laminates may be caused by crushing of concrete, rupture of FRP laminates, or delamination of the FRP sheet. Therefore, the effectiveness and failure mode of FRP sheets applied to beams and columns is related to the degree of adhesion of the epoxy to the concrete surface. When a peeling or delamination failure can be avoided, a more effective engagement of the FRP sheet occurs, which results in more efficient use of the material. One of the principal factors affecting the bond behavior between the concrete and epoxy is the roughness of the concrete substrate. To prepare the bond surface, sand blasting or grinding is typically used to roughen the concrete. To that end, a portable device has been developed to measure the roughness of concrete surfaces. This device can be used as a quality-control tool to characterize surface roughness and identify when an adequate surface preparation has been attained. The method uses laser striping and image analysis. The method was tested on six slabs of sandblasted concrete, which were sandblasted to varying degrees of surface roughness, and a series of nine plastic model concrete surface profiles.
N. H. Maerz et al., "Concrete Roughness Characterization using Laser Profilometry for Fiber-Reinforced Polymer Sheet Application," Transportation Research Record: Journal of the Transportation Research Board, no. 1775, pp. 132-139, Transportation Research Board, Jan 2001.
The definitive version is available at http://dx.doi.org/10.3141/1775-16
Geosciences and Geological and Petroleum Engineering
Civil, Architectural and Environmental Engineering
American Concrete Institute
University of Missouri--Rolla. University Transportation Center Program
Keywords and Phrases
Characterization; Fiber reinforced plastics; Laser applications; Organic polymers; Plastics applications; Profilometry; Roughness measurement; Strength of materials; Substrates; Surface roughness; Concrete roughness characterization; Fiber reinforced polymer sheet application; Laser profilometry
International Standard Serial Number (ISSN)
Article - Journal
© 2001 Transportation Research Board, All rights reserved.