ROUGH CONCRETE SURFACES FOR STRENGTHENING AND RETROFITTING – 3D MODEL OF ROUGHENING PROCESS FOR DESCRIPTION OF CONCRETE SURFACE GEOMETRY

Author(s): R. Ortlepp
Book Title: Seventh International RILEM Conference on High Performance Fiber Reinforced Cement Composites (HPFRCC7)
Editor: H.W. Reinhardt, G.J. Parra-Montesinos, H. Garrecht
ISBN: 978-2-35158-145-2
e-ISBN: 978-2-35158-146-9
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 145-152
Total Pages: 8
Language: English

Abstract: Natural resources can be conserved if we carefully maintain the building stock and indeed extend the useful economic life of buildings. One way to achieve this is to enhance loadbearing structures by repair, restoration or strengthening. Such upgrading often involves applying a new concrete layer to existing concrete elements. In order to ensure an homogenous load bearing behaviour, it is necessary that load transfer be assured across the rough concrete joint or interface. This transfer of forces is largely dictated by the properties of the old concrete substrate and particularly by the aggregates.

A simulation of the roughening process shows how different grain-size distribution curves influence the geometry of the emerging rough surface. Representative cut-outs of the grain structure were 3D-modelled for 12 variants of grain-size distribution curves. Various parameters to describe the rough surface were calculated from the modelled surface data and scrutinized to determine their practical use for surface characterisation. Roughened concrete joints should be designed to reflect the project findings.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00