Central Technological Library of the University of Ljubljana (CTK)
13.
Concrete ductility as a parameter for designing of tunnel and mine roadway linings
Šušteršič, Jakob ; Zajc, Andrej, 1938-
Because of crack propagation in length direction as well in width direction is prevented by presence of fibres in fibre reinforced concrete (FRC), fibres keep the strength from falling after first ...crack. This is one of the fundamental function of fibres in concrete. In many applications, both steel and polypropylene fibres are used. Higher energy is needed for further crack propagation after first crack, because of mutually bridging effect of both fibres. Therefore, increase of toughness andductility of FRC have been reached. A strength of concrete increase with its age. The higher thestrength of the concrete, the more brittle is its response. However, efficiency of fibres in the FRC is increased too with the age, because of bond between fibres and hardened cement paste has improved. The results of our investigations are shown that toughness of SFRC decreases up to age of 28 days, and after that time it increases moderate. Toughness is measured and calculated according to the standard test methods of ASTM C 1018 and JCI-SF4.
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