We Claim:
1. A bituminous composition which is in solid form under cold
conditions and in divided form, characterized in that the composition
comprises:
a) at least one pitch with a penetrability at 25°C ranging from 0 to 20 1/10 mm and a ring and ball softening point (RBSP) ranging from 115°C to 175°C, it being understood that the penetrability is measured according to the standard EN 1426 and that the RBSP is measured according to the standard EN 1427, and
b) at least one bitumen base.

2. The composition as claimed in claim 1, in which the pitch is an oxidized pitch.
3. The composition as claimed in claim 1 or 2, in which the pitch is present in an amount ranging from 2% to 30% by mass relative to the total mass of the composition.
4. The bituminous composition as claimed in any one of claims 1 to 3, which is solid under cold conditions and in divided form, and also comprises at least one chemical additive chosen from an organic compound, a paraffin, a polyphosphoric acid, and mixtures thereof.
5. The bituminous composition as claimed in claim 4, comprising from 0.1% to 5% by mass, preferably from 0.5% to 4% by mass, more preferentially from 0.5% to 2.8% by mass and even more preferentially from 0.5% to 2.5% by mass of said chemical additive relative to the total mass of said bitumen base.
6. The bituminous composition as claimed in claim 4 or 5, in which the chemical additive is an organic compound which has a molar mass of less than or equal to 2000 g.mol"1, preferably a molar mass of less than or equal tolOOOg.mol"1.

7. The bituminous composition as claimed in any one of claims 4 to 6, in the form of blocks or pellets.
8. A process for manufacturing a bitumen composition as claimed in any one of claims 1 to 7, said process comprising the following steps:

- heating the bitumen base b) to a temperature ranging from 140 to 180°C,
- introducing pitch a) into the bitumen base b),
- stirring the mixture at a temperature ranging from 140 to 180°C until a homogeneous mixture is obtained.

9. The process as claimed in claim 8, in which the pitch is introduced in the form of pellets.
10. A kit that may be used for the manufacture of a bituminous composition as claimed in any one of claims 1 to 7, comprising at least:
- a bitumen base which is solid under cold conditions and in divided form,
- a capsule comprising at least one pitch with a penetrability at 25°C
ranging from 0 to 20 1/10 mm and a ring and ball softening point (RBSP)
ranging from 115°C to 175°C, it being understood that the penetrability is
measured according to the standard EN 1426 and that the RBSP is
measured according to the standard EN 1427, in the form of pellets.
11. The kit as claimed in claim 10, in which the bitumen base which is solid under cold conditions and in divided form is in block form.
12. The kit as claimed in claim 10 or 11, in which the bitumen base which is solid under cold conditions and in divided form comprises, on one of its faces, a cavity for housing all or part of the capsule.
13. The kit as claimed in claim 12, in which the capsule is removably housed entirely or partially in said cavity.
14. A process for preparing a bituminous composition as claimed in any one of claims 4 to 7, comprising:

- the mixing of at least one bituminous composition as claimed in any one of claims 1 to 3 and of at least one chemical additive chosen from an organic compound, a paraffin, a polyphosphoric acid, and mixtures thereof, to form a supplemented bituminous composition,
- the forming of the supplemented bituminous composition in the form of a block or pellets.

15. A process for transporting and/or storing and/or handling a bituminous composition as claimed in any one of claims 4 to 7, said bituminous composition being transported and/or stored and/or handled in the form of blocks or pellets of bituminous composition which are solid at ambient temperature.
16. A bituminous surfacing mix or concrete comprising the bituminous composition as claimed in any one of claims 1 to 7 and aggregates.
17. The use of a bituminous composition as claimed in any one of claims 1 to 7, for the manufacture of bituminous surfacing mixes or bituminous concretes.
18. A process for manufacturing bituminous surfacing mixes or bituminous concretes comprising at least one bituminous composition and aggregates, the bituminous composition being chosen from bituminous compositions which are solid under cold conditions and in divided form as claimed in any one of claims 4 to 7, this process comprising at least the steps of:

- heating the aggregates to a temperature ranging from 100°C to 180°C,
- mixing the aggregates with the bituminous composition in a tank such as a mixer or a mixing drum,
- obtaining surfacing mixes.
19. The process as claimed in claim 18, which does not include a step of
heating the bituminous composition which is solid under cold conditions
and in divided form, before it is mixed with the aggregates.

20. The use of a pitch with a penetrability at 25°C ranging from 0 to 20 1/10 mm and a ring and ball softening point (RBSP) ranging from 115°C to 175°C, it being understood that the penetrability is measured according to the standard EN 1426 and that the RBSP is measured according to the standard EN 1427, for increasing the modulus of a bituminous composition or for increasing the modulus of bituminous surfacing mixes or bituminous concretes.