Abstract: A process for constructing infrastructures, in which aggregates, vitrified blast-furnace slag, a pulverulent activator and water are mixed together, the mix is spread out over the ground, compacted and left to harden, and in which a particulate slag and a ready-prepared additive containing, on the one hand, the activator and, on the other hand, dry ground vitrified slag having a particle size of less than 500 &mgr;m are added to the aggregate is provided. Further provided is the additive for the construction of infrastructures according to the said process, which additive includes, on the one hand, a pulverulent activator and, on the other hand, dry ground vitrified slag having a particle size of less than 500 &mgr;m.

Abstract: The present invention relates to a process for manufacturing a soil treatment composition, to soil treatment compositions and to the use of such compositions. The process according to the invention comprises a step of selecting one or more slags having a predetermined free lime content of greater than or equal to a first threshold value, a step (B1) of adding free lime to the slag or slags and a step of grinding the slag or slags in order to obtain a soil treatment composition having a predetermined free lime content of greater than or equal to a second value.

Abstract: Device for maneuvering large capacity bags filled with powdered or granular materials wherein a square 6 formed from four tubes 11-14 is placed on the bag, the cross-pieces 9 formed by the ends of the tubes being engaged in the straps 2-5 of the bag. The forks of a forklift truck can be inserted in two parallel tubes enabling the bag to be maneuvered without risk of overturning, without the truck driver leaving his seat and without the help of another person. Equipped with an annular accessory 18 forming a support for the funnel 21 of a bag 20 which can be locked onto the inner sides of the tubes so that is inscribed in the square, one of the major applications of the device according to the invention is the robotization of the emptying and filling of flexible containers.