Creep and shrinkage of steel fibre reinforced concrete

To find out an influence of fibre reinforcement onto creep and shrinkage of fibre reinforced plain concrete required an experimental program that contained long-term properties research of many testing specimens from different types of concrete mixtures. Presented results represent the first proved dependent of long time deformation of concrete reinforced by straight steel fibres with different length "L" and diameter "d", it means with different slenderness ratio Lid. Fibres are made from semi-hard steel. Two base doses of fibres were tested and compared with plain concrete with a similar structure. From results of tests, four basic general conclusions about influence of steel fibre reinforcement upon long time deformation properties of concrete can be derived. These principles for tested fibres need to be verified for other types of fibres through following long time testing programs. Database, as big as possible, of gained results will help to establish general relationships, that will be used by designers for steel fibre reinforced concrete (SFRC) structures design and for more precise calculating with creep and shrinkage of SFRC.