Influence of PP-Fibres to Concrete Permeability

Influence of PP-Fibres to Concrete Permeability

Paper in proceedings (conference paper)

Permeability of the surface layers of RC structure for gasses and liquids depends on the actual stat of a porous structure and on moisture content. Surface layers significantly efect durability of the RC structures. One of the recent diagnostic methods evaluating the actual state of the concrete surface layers is the structure permeability method for air. The method theoretically developed J.R. Torrent, who also assisted at manifacturing of an excellent device TPT (Torrent Permeability Tester (1). The structure state of concrete is influenced by the course of hydratation both in setting and hardening concrete. In this stage originate is concrete micro-cracks, which initiate development of cracks and failures. This unfacourable state can be reduced by addition of some polymeric fibres into fresh concrete. The contribution describes test results from polypropylene fibres application and their affects on the permeability of the concrete surface layers for air. The results of the experimental tes are evaluated with criteria for properties of concrete from the durability viewpoint (2).

Permeability of the surface layers of RC structure for gasses and liquids depends on the actual stat of a porous structure and on moisture content. Surface layers significantly efect durability of the RC structures. One of the recent diagnostic methods evaluating the actual state of the concrete surface layers is the structure permeability method for air. The method theoretically developed J.R. Torrent, who also assisted at manifacturing of an excellent device TPT (Torrent Permeability Tester (1). The structure state of concrete is influenced by the course of hydratation both in setting and hardening concrete. In this stage originate is concrete micro-cracks, which initiate development of cracks and failures. This unfacourable state can be reduced by addition of some polymeric fibres into fresh concrete. The contribution describes test results from polypropylene fibres application and their affects on the permeability of the concrete surface layers for air. The results of the experimental tes are evaluated with criteria for properties of concrete from the durability viewpoint (2).

permeability, TPT testing methods, surface layer

permeability, TPT testing methods, surface layer

JURÁNKOVÁ, V., ADÁMEK, J., JURÁNEK, P.

01.12.2005

Ústav fyziky FAST

Workshop NDT 2005

47-52

6