Abstract: The invention relates to a fiber/cement composite, the cementitious matrix of which has a water/binder ratio of less than 0.25 and consisting of cement, aggregate elements, fine pozzolanic elements and a plasticizer. The reinforcement consists of three types of fiber: a) metal fibers having a length of between 15 and 25 mm and a diameter of between 0.25 and 0.3 mm, in a percentage by volume of between 0.5 and 3%; b) metal fibers having a length of between 5 and 10 mm and a diameter of between 0.15 and 0.2 mm, in a percentage of between 4 and 7%; and c) 1.5 to 5% of short metal fibers having a length of less than 3 mm. The strength of this composite in uniaxial tension is greater than or equal to 30 MPa. It exhibits positive work-hardening and ductile behavior in uniaxial tension.

Abstract: A method and a device usable in particular for washing solid products contaminated by hydrocarbons.According to this method, a desorbent liquid phase is used to wash solid products which are brought into contact with this desorbent liquid phase forming a mixture consisting of solution, desorbed hydrocarbons and washed products. Said mixture, freed from gravel, undergoes at least one separation stage, this separation giving a underflow comprising at least the major part of the washed sand and an overflow from which the hydrocarbons and the aqueous phase are recovered.This method is applicable to de-oiling oil-contaminated sands and gravels.