Design and execution of floors on ground and industrial pavements with fibre reinforced concrete

POMBO, R.; ALTAMIRANO, MG; GIACCIO, G.; ZERBINO, R.

Valencia

Simposio; X RILEM-fib International Symposium on Fibre Reinforced Concrete (BEFIB); 2021

Univ Pol Valencia

Steel and synthetic macrofibres are widely used as a replacement for nominal reinforcement in industrial floors and pavements. Some of the properties of the wet and hardened concrete enhanced by the fibres provide superior behaviour to the slabs containing conventional steel bars reinforcement. Fibres control the extent and size of cracks formed due to drying shrinkage and allow the extension of the slabs joint spacing. Fibres improve the post-cracking properties of concrete increasing flexural and ultimate load carrying capacity of the slabs. Finally, the combination of fibres with an expansive agent to obtain a ?Shrinkage-Compensating-Fibre-Reinforced Concrete? allows the design of large slabs with almost no cracks and with tight joints widths. Although the same considerations for a good concrete mix design without fibres are also Good for a FRC, care should be taken to avoid increasing potential shrinkage and curling using inappropriate materials and proportions. Examples of large floor and pavement works in Argentina using these technologies are presented,mentioning the different fibre types incorporated and explaining the FRC properties considered in the design. Comparison between laboratory and on field results is shown. FRC characterization included the evaluation of workability, free and restrained shrinkage, compressive and flexural residual strengths. In addition, comparisons between polymer and steel FRC behaviour are made.