Highly resistant and ductile fibre concrete

Details Highly resistant and ductile fibre concrete Highly resistant and ductile fibre concrete

C - Chemistry, Metallurgy

04

B

C04B 7/52 (2006.01) C04B 14/48 (2006.01) C04B 20/00 (2006.01) C04B 28/02 (2006.01)

Patent

CA 2420775

The invention concerns a concrete wherein are dispersed metal fibres obtained by mixing with water a composition containing: a) a cement; b) fine elements with pozzolanic reaction; c) granular elements divided into two granular categories C¿1? > 1 mm and < 5 mm and C¿2? from 5 to 15 mm; d) cement additives; e) an amount E of water added in the mixture; f) a dispersing agent, and preferably a superplasiticizer; g) metal fibres in amount not more than 120 kg/m?3¿ of concrete; the contents of the different constituents (a), (b), (C¿1?), (C¿2?), (d) and the amount of water E, expressed in volume, satisfying the following relationships: ratio 1: 0.50 <= (C¿2?)/(C¿1?) <= 1.20; ratio 2: 0.25 <= [(a)+(b)+(d)]/[(C¿1?)+(C¿2?)] <= 0.60; ratio 3: 0.10 <= (b)/(a) <= 0.30; ratio 4: 0.50 <= E/[(a)+(b)+(d)] <= 0.75; ratio 5: (d)/(a) <= 0.2. The invention is useful for making segments without reinforcements, slabs and panel-type elements, shells or the like.

Béton dans lequel sont dispersées des fibres métalliques, obtenu par mélange avec de l'eau d'une composition comprenant: a) un ciment; b) des éléments fins à réaction pouzzolanique; c) des éléments granulaires répartis entre deux classes granulaires C1 < 1mm et > 5 mm et C2 de 5 à 15 mm; d) des additions cimentaires; e) une quantité d'eau E ajoutée dans le mélange; f) un agent dispersant, et de préférence un superplastifiant; g) des fibres métalliques en quantité au plus égale à 120 kg/m3 de béton; les teneurs des différents constituants (a), (b), (C1), (C2), (d) et la quantité d'eau E, exprimées en volume, satisfaisant aux relations suivantes: ratio 1, 0,50 <= (C2)/(C1) <= 1,20; ratio 2, 0,25 <= [(a)+(b)+(d)]/[(C1)+(C2)] <= 0,60; ratio 3, 0,10 <= (b)/(a) <= 0,30; ratio 4, 0,50 <= E/[(a)+(b)+ (d)] <= 0,75; ratio 5, (d)/(a) <= 0,2. Application à la fabrication de voussoirs sans armatures, de dalles et d'éléments de type plaques, coques ou similaires.

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