Evolution of the hydraulic and mechanical properties of gelfill

N. Abdul-Hussain, M. Fall

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Mining and Rock Mechanics

ABSTRACT: Hydraulic (H), and mechanical (M) properties are important performance criteria of the gelfill (GF). The understanding of these properties, their interactions and their evolution with time and/or cement hydration degree is still limited due to the fact that GF is a new cemented backfill material. Therefore, a laboratory investigation is conducted to study the hydraulic and mechanical properties of GF and their evolution with time and binder hydration degree. Over 100 GF samples, 5 cm in diameter and 10 cm in height were prepared with various binder proportions (2.0 %, 4.5 %, and 6.0 % PCI), w/c ratios (18.5, 8.2, and 6.2) respectively, and 0.4% (by weight of solids) sodium silicate type N. Samples were cured in room temperature for 3, 7, 28, 90, and 120 days. Uniaxial compressive strength (UCS) and saturated hydraulic conductivity tests were conducted. Valuable results were gained regarding the evolution of the hydraulic and mechanical properties. The study showed that hydraulic and mechanical properties are time-dependent or affected by the binder hydration degree. Mechanical properties are affected by binder content, binder types, hydration degree and curing time while the hydraulic conductivity of the GF decreases as the binder content increases and the binder hydration degree increases

RÉSUMÉ: Le-gels (RG). La connaissance de ces propriétés, leurs interactions et leur évolution dans le temps et/ou en fonction du degré toujours insuffisante; ceci est principalement dû au fait que le RG est un nouveau matériau et mécaniques du RG et leur évolution dans le temps et/ou en fonction du degré échantillons de RG, de 5 cm en diamètre et 10 cm en hauteur, ont été préparés avec diverses proportions de ciment (2,0 %, 4,5 %, et 6,0 % CP I), rapports e/c (18.5, 8.2, et 6.2) respectivement, et avec 0,4% (en masse de solides) de silicate de sodium de type N. Les échantillons ont été soumis à différents temps de cure (3, 7, 28, 90, et 120 jours) dans des conditions de température ambiante. Des essais de résistance uniaxiale compressive et de conductivité hydraulique ont hydrauliques et mécaniques. Cette étude montre que ces propriétés sont fonction du temps et du augmentent.

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