Mechanical behavior and durability of fiber concrete in an aggressive environment (sewers)

Ourdia Fedaoui-Akmoussi (1) , Raoul Jauberthie (2) , Salah Kaci (1) , Laurent Molez (2)

1 Laboratoire de Génie Civil
2 LGCGM - Laboratoire de Génie Civil et Génie Mécanique

Hydrogen sulphide (H2S) released into the sewerage, can cause different alterations that can cause damage when the partial destruction of works of sanitation. The impact of these degradations is very harmful to human health side, health and economy. To understand these phenomena a study was carried out to examine the mechanical behavior and durability of mortar with or without addition of silica fume, with and without steel fibre reinforcement. Three tests were carried out: strength, depth of pH reduction using phenolphthalein, and micro-structural analysis by SEM. The mixes studied had various water cement ratios (0.5; 0.65; 0.8), with a 0.5% steel fibre content and 10% silica fume content. To characterize the durability performance of the mortars studied, samples were exposed to one-year cyclic wetting and drying: control samples under laboratory conditions and exposure samples in a sewage pumping station sump. SEM observations were carried out on samples with 0.8 w/c ratio to study the micro structural changes in the mortar's matrix.

Mots clés: Wastewater; asset Management; mechanical behavior; microstructure; fiber concrete

Domaines: Construction durable; Matériaux composites et construction; Mécanique des matériaux [physics.class-ph]

Ourdia Fedaoui-Akmoussi, Raoul Jauberthie, Salah Kaci, Laurent Molez. Mechanical behavior and durability of fiber concrete in an aggressive environment (sewers). TRIZ Future Conference, Oct 2012, Lisbon, Portugal. ⟨hal-01599404⟩