Replacement of minimum steel bar reinforcement with steel fibres in structural concrete members

FIBRE CONCRETE 2017

Junker, F.^1 ; Holschemacher, K.^1 ; Müller, T.^2 ; Kieslich, H.^3

HTWK Leipzig, University of Applied Sciences, Structural Concrete Institute, Karl-Liebknecht-Strasse 132, Leipzig

04277, Germany^1

Baustoffprüflabor Müller and Lobisch GmbH, Am Gewerbepark 8, Dreiheide, OT Süptitz

04860, Germany^2

KandK Baugesellschaft MbH, Güterbahnhofstraße 5a, Torgau

04860, Germany^3

关键词: Concrete beam;    Flexural loading;    Four-point bending test;    Light-weight aggregate concrete;    Lightweight aggregate concrete(LWAC);    Steel bar reinforcement;    Steel fibre reinforcement;    Structural concretes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/246/1/012003/pdf
DOI  :  10.1088/1757-899X/246/1/012003

来源: IOP

【 摘 要 】

Using lightweight concrete enables a decrease in dead load and thermal conductivity in the case of the manufacturing of structural concrete members. With the addition of steel fibres in concrete, its properties are altered from brittle to ductile, so that the use of additional minimum reinforcement for securing ductility and crack control can be avoided. This study is aimed at investigating the possibility of replacing conventional minimum steel bar reinforcement with steel fibre reinforcement in lightweight aggregate concrete under flexural loading. Therefore, six full-scaled beams with two different lightweight aggregate concretes (LWAC) (oven-dry densities of 3and 3) as well as different types of reinforcement were prepared. For each LWAC, a beam with traditional steel bars, a beam with steel fibres and a beam with a combination of steel fibre reinforcement and reduced steel bar reinforcement were produced. The cracking behaviour of the lightweight concrete beams was studied in a four-point bending test. The results of this study show that it is possible to replace a high amount of the conventional mesh or bar reinforcement with steel fibres.