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Application of WST-method for fracture testing of fibre-reinforced concrete

Ingemar Löfgren (Institutionen för konstruktionsteknik, Betongbyggnad) ; John Forbes Olesen ; Mathias Flansbjer
Göteborg : Chalmers University of Technology, Department of Structural Engineering and Mechanics, 2004.
[Rapport]

To evaluate the reproducibility of the wedge-splitting test method and to provide guidelines, a round robin study was conducted in which three labs participated. The participating labs were: - DTU –Technical University of Denmark, Department of Civil Engineering; - CTH – Chalmers University of Technology, Department of Structural Engineering and Mechanics; and - SP –Swedish National Testing and Research Institute. Two different mixes were investigated; the difference between the mixes was the fibre length (Mix 1 with 40 kg of 35 mm long fibres and Mix 2 with 40 kg of 60 mm long fibres). The test results from each lab were analysed and a study of the variation was performed. From the study of the intra-lab variations, it is evident that the variations of the steel fibre-reinforced concrete properties are significant. The coefficient of variance for the splitting load was found to vary between 20 to 40%. The investigation of the inter-lab variation, based on an analysis of variance (ANOVA) indicated that there is no inter-lab variation. The test result can be said to be independent of the testing location and the equipment used (with or without CMOD-control). The conclusions that can be drawn from this study are that: - the wedge-splitting test method is a suitable test method for assessment of fracture properties of steel fibre-reinforced concrete; - the test method is easy to handle and relatively fast to execute - the test can be run with CMOD-control or without, in a machine with a constant cross-head displacement rate (if rate is equal to or less than 0.25 mm/min); - due to variations in fibre distribution, the scatter of the test results is high; - the dimensions of the specimen (height, width, and thickness) should, if possible, be four times the maximum fibre length, or at least more than three times the fibre length; - using inverse analysis, the tensile fracture properties can be interpreted from the test result as a bi-linear stress-crack opening relationship.

Nyckelord: Fibre-reinforced concrete, fracture testing, wedge-splitting test method, Nordtest.



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Denna post skapades 2006-09-25. Senast ändrad 2016-10-15.
CPL Pubid: 9239

 

Institutioner (Chalmers)

Institutionen för konstruktionsteknik, Betongbyggnad (1971-2004)

Ämnesområden

Building Futures
Samhällsbyggnadsteknik

Chalmers infrastruktur

Ingår i serie

Rapport - Institutionen för konstruktion och mekanik, Chalmers tekniska högskola