US 6,887,309 B2Granted

Highly resistant and ductile fiber concrete

AssigneeLafarge

InventorsPascal Casanova, Hu Chong, Bernard Clavaud

Life of this patent

Estimating the term…

Loading patent…

Abstract

A concrete in which metallic fibers are dispersed, obtained through mixing with water a composition including a cement; ultrafine elements with a pozzolanic reaction; granular elements distributed into two granular classes (C1)>1 mm and <5 mm and (C2) ranges from 5 to 15 mm; cement additions; an amount of water E added in the mixture; a dispersant, and preferably a superplasticizer; metallic fibers, in an amount maximum equal to 120 kg per m3 of concrete, the contents of the various components (a), (b), (C1), (C2), (d) and the amount of water E, expressed in volume, meeting the following relationships: 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: 0.05≦E/[(a)+(b)+(d)]≦0.75; ratio 5: (d)/(a)≦0.20. The invention applies to the manufacture of voussoirs without frameworks, of tiles and of elements of the plate, shell type or the like.

Claims38

Dependent claims

A concrete in which metallic fibres are dispersed, obtained through mixing with water a composition comprising:

(a) a cement with particles having a grain size D50 ranging from 10 to 20 μm;
(b) ultrafine elements with a pozzolanic reaction, element particles of said ultrafine elements having a grain size D50 of maximum 1 μm;
(c) granular elements distributed into two granular classes C1 and C2 defined as follows:
(C1):
particles with a size higher than 1 μm and lower than 5 mm,
(C2):
particles with a size ranging from 5 to 15 mm;
(d) cement additions with a grain size D50 lower than or equal to 100 μm;
(e) an amount of water E added;
(f) a dispersant or a superplasticizer, being present in a dry matter proportion ranging from 1.5 to 5% by volume based on the cement;
(g) metallic fibres, in an amount maximum equal to 120 kg per m3 of concrete and having an individual length l such that the concrete has a l/φ ratio of at least 2, l being the fibre individual length and φ being the diameter of the biggest grain;
wherein contents of components (a), (b), (C1), (C2), (d) and the amount of water E, expressed in volume, meet the following relationships:
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)≦0.20.

19 more elements

A method for producing a concrete in which metallic fibres are dispersed, comprising mixing an amount of water E with a composition comprising:

(a) a cement with particles having a grain size D50 ranging from 10 to 20 μm;
(b) ultrafine elements with a pozzolanic reaction, element particles of said ultrafine elements having a grain size D50 of maximum 1 μm;
(c) granular elements distributed into two granular classes (C1) and (C2) defined as follows:
(C1):
particles with a size higher than 1 μm and lower than 5 mm,
(C2):
particles with a size ranging from 5 to 15 mm;
(d) cement additions with a grain size D50 lower than or equal to 100 μm;
(e) a dispersant or a superplasticizer, present in a dry matter proportion ranging from 1.5 to 5% by volume based on the cement;
(f) metallic fibres in an amount maximum equal to 120 kg per m3 of concrete and having an individual length l such that the concrete has a l/φ ratio of at least 2, l being the individual length of the fibres and φ being the diameter of the biggest grain;
wherein contents of components (a), (b), (C1), (C2), (d) and the amount of water E, expressed in volume, meet the following relationships:
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)≦0.20.

18 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/362,519Filed 31 Aug 2001
Priority: FR 00 112091 Sep 2000
Published: US 2004/0050302 A118 Mar 2004
Granted: 3 May 2005
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

C04B 7/527
Grinding ; After-treatment of ground cement: obtaining cements characterised by fineness, e.g. by multi-modal particle size distribution
C04B 20/008
Characterised by the grain distribution: micro- or nanosized fillers, e.g. micronised fillers with particle size smaller than that of the…
C04B 28/02
Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic…
C04B 2201/52
For the mechanical strength: high compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive…