Creep behaviour of macro glass fibre reinforced concrete beams

FIBRE CONCRETE 2017

Löber, P.^1 ; Heiden, B.^1 ; Holschemacher, K.^1

Structural Concrete Institute, HTWK Leipzig, University of Applied Sciences, Karl-Liebknecht-Straße 132, Leipzig, Germany^1

关键词: Applied stress;    Creep behaviour;    Creep coefficient;    Fibre reinforced concrete;    Four-point bending test;    Glass fibre reinforced;    Residual strength;    Structural concretes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/246/1/012028/pdf
DOI  :  10.1088/1757-899X/246/1/012028

来源: IOP

【 摘 要 】

This paper aims to present a creep study on structural concrete reinforced with macro glass fibres and wants to contribute to the understanding of creep behaviour of fibre reinforced concrete (FRC). Fibre reinforced concrete beams have been subjected to bending and tested in cracked state under defined stress levels. Therefore, a four-point-bending test setup was chosen and the creep period was 372d. The aim was to determine creep coefficients and to test residual strength values afterwards. Results show a dependence of residual strength and applied stress level. It turned out, that the beams failed due to tertiary creep at stress levels between 65 and 70% of residual crack load at 0.5 mm pre-crack deflection. Nevertheless, all remaining specimens showed increased loads after creep period. Finally, the evaluation is conducted in comparison to other fibre types.