Rhone-poulenc Chimie

Rhodia Chimie

Other

Ceca S.a.

L'etat Francais

Bouygues

Kerneos

Lafarge

Laurent Frouin

Evelyne Prat

Jerome Dugat

Pierre Richard

William Fogel

Maryse Pennavaire

Mikel Morvan

Gilles Orange

Minou Nabavi

Marcel H Cheyrezy

Jamel Mahiaoui

Bernard Alain Clavaud

Thierry Jeannette

Pascal Taquet

Jean-Louis Reymonet

Mustapha Sari

Marie-Madeleine Vincent

J&eacute;r&ocirc;me Dugat

Sandra Boivin

Andre Bertoncini

Jean-Luc Jaquier

Daniel Aubert

Ngoc L Tran

Didier Chabert

Claude Blet

Marcel Cheyrezy

Jérôme Dugat

A cellular structure thermal insulation material includes by weight as compared to the material total weight:

Thermal insulation material and method for making the same

This invention relates to an aqueous suspension including a mixture of at least one aqueous suspension of precipitated silica and of at least one latex, in which the aqueous suspension of precipitated silica has a solids content of between 10 and 40% by weight, has a viscosity lower than 4&times;10 Pa s at a shear of 50 s and, after centrifuging at 7500 revolutions per minute for 30 minutes, produces a supernatant containing more than 50% of the weight of the silica initially in suspension. This suspension can be employed in compositions based on an inorganic binder and in concrete compositions.

Aqueous silica suspensions and their applications in compositions based on inorganic binder

Composition which is useful for exterior coatings, comprising, for successive or simultaneous addition, an aqueous phase comprising a polyol dispersion or solution whose glass transition temperature (t ) is not more than 100&deg; C.; and an isocyanate sub-composition already emulsified or to be emulsified in the aqueous phase.

Exterior coating, composition used for such coatings and method for obtaining same

The invention concerns a concrete obtained by mixing with water, cement, granular elements, elements with puzzolanic reaction, constituents capable of improving the toughness of the matrix, metal fibers and at least a dispersing agent, in specified conditions and proportions. Said concrete has improved properties compared to prior art concrete comprising metal fibers.

Metal fibre concrete, cementitious matrix and pre-mixes for preparing matrix and concrete

Aqueous suspension including a mixture of at least one aqueous suspension of precipitated silica and of at least one latex

The invention relates to aqueous suspensions of precipitated silica and of aluminum sulphate which have a pH lower than 4 and a solids content of between 10 and 50% by weight and which, after a period at rest of 48 hours, are in the form of a gel. The gel is reversible under low shear. The invention also relates to processes for the preparation of these suspensions and to their uses, especially in the field of cement mixes, mortars and concretes.

Aqueous suspension of silica and of aluminium sulphate or of alum,

Self-leveling fluid mortar including calcium sulfate and lime

Cementation slurries well suited for encasing reinforcing elements therefor, for example prestressed steel cable, while reducing the risk of embrittlement thereof, contain from about 1.5% to 3% by weight of homogenizing and exudation-reducing hydrophilic particulates (e.g., precipitated silica particles) that are inert in respect of liquids, have a specific surface area of greater than about 200 m.sup.2 /g and which are fragmentable during mixing and/or injection into multiple fragments having particle sizes ranging from about 5 to 300 nanometers.

Cementation slurries for improvedly encasing reinforcing elements

A process for spraying concrete or mortar, by a dry route or by a wet route, in order to produce on a surface a layer of concrete or of mortar. Just before or at the time of spraying, an aqueous suspension (A) of silica and of an aluminum compound chosen from aluminum sulphate, basic aluminum sulphates, alums and mixtures thereof is added to the concrete or mortar. The aqueous suspension (A) has a pH lower than 4, a solids content of between 10 and 50% by weight, and, after a period at rest of 48 hours, is in the form of a gel which is reversible under low shear. The aqueous suspension (A) is effective for increasing the thickness of the sprayed layer and reducing rebound of the concrete or mortar sprayed onto the surface.

Process for spraying concrete or mortar

The invention relates to a gel made of apolar medium including:

Gel of an apolar medium, its use for the preparation of water-based

Novel aluminum phosphates, in particular amorphous aluminum phosphate powders having a BET specific surface no greater than 25 m.sup.2 /g, well suited as binders/hardeners or for the production of ceramic shaped articles, are prepared by reacting at least one aluminum compound, e.g., an aluminum oxide, hydroxide or oxyhydroxide, with phosphoric acid or an aluminum phosphate, e.g., an acid aluminum orthophosphate, in a liquid reaction medium devoid of inorganic acid anions other than of phosphoric acid, and then spray- or freeze-drying the suspension thus obtained.

Aluminum phosphates and binder compositions/ceramic materials comprised

Inorganic liquid filler compositions, well suited for the sealing or consolidation of ground formations or construction/building materials by injecting such composition into the fissures, cavities or interstices thereof (void volume) and permitting the composition to harden, comprise a homogeneous solution of (i) an alkali metal silicate, (ii) an alkali metal polyphosphate and (iii) an alkali metal aluminate.

Inorganic liquid filler compositions for consolidation/sealing of ground

Inorganic settable slurries well suited for the sealing and/or consolidation of unstable soil/ground formations, or for the sealing/repair of defective building materials, include (a) an aqueous solution of an alkali metal silicate, (b) a water-soluble calcium compound, e.g., lime, (c) an alkali metal aluminate, and (d) an alkali metal hydroxide, preferably sodium hydroxide.

Inorganic injectable slurries and consolidation of ground

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L'Hay les Roses, France

Laurent Frouin