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Case study ultra-high performance concrete

Prestressed I-girders: Part II – Fabrication and testing


This article describes the details of a case study on the flexural behaviour of two UHPC I-girders, which have been tested in collaboration with the precast company Ergon, Belgium. Part I, published in CPI issue 5/2013, already described the ultra-high performance concrete (UHPC) material utilised in this research, with an average compressive strength of 150 MPa and 1% fibre volume fraction. Part II focusses on the actual manufacturing and testing of two 7 m long I-girders containing 9 prestressing strands. These girders didn’t contain – besides the steel fibres – secondary steel reinforcement, thus the UHPC carried all secondary (i.e. shear, temperature, shrinkage) tensile stresses. In the experimental phase of this study, full-scale flexural experiments were conducted on the UHPC prestressed I-girders behaviour. These experimental results were then - in the analytical phase - are compared to a prediction based on the Eurocode 2 (EN 1992-1-1) equations, which were developed and validated for normal to high strength concrete, up to a strength class of C90/105. The possibility to use this (extrapolated) Eurocode 2 to predict the flexural performance of UHPC prestressed I-girders is evaluated.

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Belgian Building Research Institute – BBRI
www.bbri.be

Ergon Nv
Marnixdreef 5, 2500 Lier, Belgium
info@ergon.be, www.ergon.be

CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 12 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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