Creep behaviour of cracked steel and macro-synthetic fibre reinforced concrete

ZERBINO, R.; MONETTI, D.; GIACCIO, G.

MATERIALS AND STRUCTURES

SPRINGER

Lugar: Berlin; Año: 2016 vol. 49 p. 3397 - 3410

1359-5997

The study of creep behaviour of fibre concrete in cracked conditions is nowadays one of the main subjects of interest; many research groups in the world are working on this matter and the development of test methods and parameters for its characterization becomes an urgent necessity. This paper explores the use of different types and levels of long term bending loads and compares the creep rates of fibre reinforced concrete (FRC)incorporating steel and two macro-synthetic fibres. Tests arrangements with three and four point loadings were used. An initial crack with of 0.5 mmwas adopted.It was verified that the creep rate clearly increases in macro-synthetic FRC and that the application of loading-unloading cycles does not implies significant changes in the creep rate when compared to permanent loads of similar magnitude. After creep tests the remaining bending residual capacity of FRC is considerable. Similar creep behaviour was observed by using three or four point loading configuration.