Bitumen which is solid at ambient temperature

A bitumen that is solid at ambient temperature in the form of pellets comprising a core made of a first bituminous material and a coating layer made of a second bituminous material, in which:

• the first bituminous material comprises at least one bitumen base, and
• the second bituminous material comprises:
• at least one bitumen base, or at least one pitch with a ring and ball softening point (RBSP) of greater than or equal to 80° C., wherein the RBSP is measured according to standard EN 1427, or a mixture of these materials, and at least one chemical additive chosen from:
• an organic compound of general formula (II):
• R—(NH)nCONH—(X)m—NHCO(NH)n—R′ (II),
• in which:
• the groups R and R′, which may be identical or different, contain a saturated or unsaturated, linear, branched or cyclic hydrocarbon-based chain, comprising from 1 to 22 carbon atoms, which is optionally substituted, and optionally comprising heteroatoms, rings and/or heterocycles;
• the group X contains a saturated or unsaturated, linear, branched or cyclic hydrocarbon-based chain, comprising from 1 to 22 carbon atoms, which is optionally substituted, and optionally comprising heteroatoms, rings and/or heterocycles;
• n and m are integers having a value of 0 or 1, independently of each other, and
• an organic compound of general formula (V):
• R″—(COOH)z (V),
• wherein R″ represents a linear or branched, saturated or unsaturated hydrocarbon-based chain comprising from 4 to 68 carbon atoms, and z is an integer ranging from 2 to 4.