Compressive strength classes and performance classes of ultra-high-performance concrete (Part 1)

Fig. 1: Mean values of compressive strength fcm for different specimens of Series 1 to 8 and spread of individual test results [8] Figure: Leutbecher/Riedel
Fig. 1: Mean values of compressive strength fcm for different specimens of Series 1 to 8 and spread of individual test results [8]
Figure: Leutbecher/Riedel
Fig. 2: Ratios fcm,cyl100/fcm,cube100 (left) and fcm,cyl150/fcm,cyl100 (right) of Series 1 to 8 as function of the mean concrete compressive strength fcm,cyl150 [8] Figures: Leutbecher/Riedel
Fig. 2: Ratios fcm,cyl100/fcm,cube100 (left) and fcm,cyl150/fcm,cyl100 (right) of Series 1 to 8 as function of the mean concrete compressive strength fcm,cyl150 [8]
Figures: Leutbecher/Riedel
Fig. 3: UHPFRC specimens: Types, denomination, and fabrication [13] Figure: Leutbecher/Riedel
Fig. 3: UHPFRC specimens: Types, denomination, and fabrication [13]
Figure: Leutbecher/Riedel
Fig. 4: Loading direction and predominant fiber orientation (qualtitative) in compression tests on cubes [13] Figure: Leutecher/Riedel
Fig. 4: Loading direction and predominant fiber orientation (qualtitative) in compression tests on cubes [13]
Figure: Leutecher/Riedel
Fig. 5: Prepared photograph of the polished cross-section of a beam of Series 1 (left) and distribution of the fiber orientation hv (right) Figure: Leutbecher/Riedel
Fig. 5: Prepared photograph of the polished cross-section of a beam of Series 1 (left) and distribution of the fiber orientation hv (right)
Figure: Leutbecher/Riedel
Fig. 6: Mean values of compressive strength fcm of different specimens and test series and spread of individual test results [13] Figure: Leutbecher/Riedel
Fig. 6: Mean values of compressive strength fcm of different specimens and test series and spread of individual test results [13]
Figure: Leutbecher/Riedel
Fig. 7: Ratios Cyl/Cube as function of the fiber volume fraction ρf (Cyl100/Cube100 is the average ratio fcm,cyl100/fcm,cube100 of Series 4, 5, 7, and 8 from Fig. 2a) Figure: Leutbecher/Riedel
Fig. 7: Ratios Cyl/Cube as function of the fiber volume fraction ρf (Cyl100/Cube100 is the average ratio fcm,cyl100/fcm,cube100 of Series 4, 5, 7, and 8 from Fig. 2a)
Figure: Leutbecher/Riedel
Torsten Leutbecher Studied civil engineering at Fachhochschule Würzburg, Germany, between 1994 and 1999. In 1998 and 1999, he worked as structural engineer at rmi Reuter + Mittnacht Ingenieure – Consulting engineers VBI, Würzburg. From 1999 to 2001, he studied civil engineering at Universität Kassel. Between 2001 and 2006, he was research assistant at the Chair of Structural Concrete at Universität Kassel. In 2007, he received his doctoral degree from Universität Kassel. Between 2006 and 2008, he worked as structural engineer at Ingenieurbüro für Bauwesen Fehling + Jungmann GmbH – Consulting engineers VBI, Kassel. From 2008 to 2014, he was Akademischer Rat at the Chair of Structural Concrete at Universität Kassel. In 2014, he was appointed professor of structural concrete at Universität Siegen. Since 2014, he is chairman of Task Group „Design and construction“ of the DAfStb-subcommittee „Ultra-High-Performance Concrete“
Torsten Leutbecher
Studied civil engineering at Fachhochschule Würzburg, Germany, between 1994 and 1999. In 1998 and 1999, he worked as structural engineer at rmi Reuter + Mittnacht Ingenieure – Consulting engineers VBI, Würzburg. From 1999 to 2001, he studied civil engineering at Universität Kassel. Between 2001 and 2006, he was research assistant at the Chair of Structural Concrete at Universität Kassel. In 2007, he received his doctoral degree from Universität Kassel. Between 2006 and 2008, he worked as structural engineer at Ingenieurbüro für Bauwesen Fehling + Jungmann GmbH – Consulting engineers VBI, Kassel. From 2008 to 2014, he was Akademischer Rat at the Chair of Structural Concrete at Universität Kassel. In 2014, he was appointed professor of structural concrete at Universität Siegen. Since 2014, he is chairman of Task Group „Design and construction“ of the DAfStb-subcommittee „Ultra-High-Performance Concrete“
Philipp RiedelStudied civil engineering at Hochschule Zittau/Görlitz, Germany, between 2005 and 2009. From 2009 to 2011, he studied civil engineering at Universität Kassel. From 2011 to 2014, he worked as structural engineer at EFG Beratende Ingenieure GmbH, Fuldabrück. Since 2014 he is research assistant at the Chair of Structural Concrete at Universität Siegen.
Philipp Riedel
Studied civil engineering at Hochschule Zittau/Görlitz, Germany, between 2005 and 2009. From 2009 to 2011, he studied civil engineering at Universität Kassel. From 2011 to 2014, he worked as structural engineer at EFG Beratende Ingenieure GmbH, Fuldabrück. Since 2014 he is research assistant at the Chair of Structural Concrete at Universität Siegen.

At present, a national technical approval or an approval on a case-by-case basis is required for structural applications of concretes >C100/115 as well as steel fiber reinforced concretes >C50/60. This holds true likewise to the application of ultra-high-performance concrete (UHPC), which is not yet regulated in Germany. This two-part paper presents the intended classification and reports on the backgrounds and test methods; please read the first part here.

1 Introduction

The spectrum of normal weight concretes covered by DIN EN 206 [1] and DIN EN 1992-1-1 [2, 3] ends at compressive strength class C100/115 in Germany at present. The characteristics and the application of steel fiber reinforced concrete are regulated in Germany by the DAfStb Guideline „Steel Fibre Reinforced Concrete“ [4] up to compressive strength class C50/60. A national technical approval of the Deutsches Institut für Bautechnik (DIBt) or an approval on a case-by-case basis granted by the supreme building authority is currently required for the structural application of (steel...

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