Ciments Francais

Pierre Cassat

Luigi Cassar

Pierre Colombet

Laurent Bonafous

Francine Colombet, Legal Representative

Bruno Le Rolland

Emmanuel Moudilou

Michel Pasquier

Laurent Guillot

A method of treating marine or river dredging sediments, especially harbour zone sediments, whose free water content is between 40% and 80% by weight, for the purpose of obtaining a solid material which is easy to handle, includes the following successive steps: mixing the sediments with a treatment composition including a sulphoaluminate binder and at least one other component selected from a sulphate source and a catalyst of the hydration reactions of the sulphoaluminate binder; a step of setting of the mixture, leading to a compact mixture having a free water content of less than 20% by weight; then fractionating the compact mixture. The sediment thus treated may be incorporated into concrete or mortar formulas, which then have leachable fractions of less than 1% by weight.

Method of treating marine sediments and use of the resulting solid product in mortars or concretes

The photocatalytic granular mixture for mortar and concrete includes a photocatalyst in the form of at least two granular classes with different B.E.T. specific surfaces. It has a photocatalytic activity greater than that of a monodisperse photocatalyst with a single range of B.E.T. specific surface, and thus permits, in association with a conventional hydraulic binder, to obtain construction and repair materials whose aptitude for self cleaning, for the reduction of odors, and for the depollution of ambient air, is considerably improved.

Photocatalytic granular mixture for mortar and concrete and its use

The surface deactivating composition for concrete or mortar comprising a retardant, water and if desired a rheology modifying agent of the HASE type (emulsion, soluble in alkali, of a polymer with hydrophobic modification), characterized in that the retardant is a carboxylic acid and in that the concentration of HASE is greater than or equal to 0.5% by weight. The process of application consists in applying this deactivating composition in proportions of the order of 0.25&plus;0.05 liter per square meter of the surface, then washing with water this surface after a predetermined period.

Composition for deactivating the surface of concrete or mortar and its process of application

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Le Mesnil Simon, France

Pierre Cassat