Applications of steel fiber reinforced concrete in Finnish infrastructure
Insinööritieteiden korkeakoulu | Master's thesis
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Master's Programme in Building Technology (CIV)
109 + 22
AbstractFibers are used widely in concrete industry now-a-days for a variety of purposes. Besides other fiber materials, Steel Fiber has much more significance due to its greater strengths and strain hardening behaviour. Steel fiber reinforced concrete (SFRC) reduces the cost while adding mechanical strengths to concrete. Such type of concrete uses readily available concrete materials for the mix except some special types of steel fibers. This research focuses the structural/infrastructural use of steel fibers in concrete using materials available in Finland e.g cement, sand, and aggregates etc. The main focus rests on replacing conventional reinforcement with steel fibers. Different dosages of steel fibers are tested, in increasing order, to check the increasing strengths and ductility. Thesis required beam and slab tests. Beam tests are performed according to SFS-EN 14651 and the slab tests are conducted as five-point bending test. The slabs with only steel fibers and with conventional reinforcements, both, are tested and compared. Residual flexure tensile strength values against crack mouth opening displacements (CMODs) change with differential steel fiber dosage and concrete strength class. Such values cannot be extracted through interpolation and need tests to be performed. The values, as a results of beam tests, can be used for design purposes according to BY-66. Moment capacities of the test slabs were derived forehand using the residual strengths of the used SFRC dosages. Design process is included in the appendix.
Thesis advisorTulimaa, Mika
steel fiber reinforced concrete, fiber reinforced concrete, BY-66, residual flexural tensile strengths