BITUMINOUS COMPOSITION SOLID AT AMBIENT TEMPERATURE
A bituminous composition includes at least one bitumen base, at least one first chemical additive chosen from compounds of general formula Ar1-R 1 -Ar 2 (I), and at least one second chemical additive chosen from a second chemical additive chosen from the reaction products of at least one C 3 -C 12 polyol and of at least one C 2 -C 12 aldehyde. This composition can be used for different industrial applications and as road binder, notably for the preparation of bituminous mixes.
1 .- 15 . (canceled)
16 . A bituminous composition comprising at least:
a) a bitumen base,
b) a first chemical additive chosen from compounds of general formula (I):
Ar1-R1-Ar2 (I)
wherein:
Ar1 and Ar2 represent, independently of one another, an aromatic group comprising from 6 to 20 carbon atoms chosen among a benzene nucleus or a system of condensed aromatic nuclei, said hydrocarbon group being substituted by at least one hydroxyl group and optionally by one or more C1-C20 alkyl groups, and
R1 represents an optionally substituted hydrocarbon divalent radical, the main chain of which comprises from 6 to 20 carbon atoms and at least one group chosen from the amide, ester, hydrazide, urea, carbamate and anhydride functional groups,
c) a second chemical additive chosen from the reaction products of at least one C 3 -C 12 polyol and of at least one C 2 -C 12 aldehyde.
17 . The bituminous composition as claimed in claim 16 which is solid at ambient temperature and in a divided form.
18 . The bituminous composition as claimed in claim 17 , which is in the form of blocks or pellets.
19 . The bituminous composition as claimed in claim 16 , wherein the compound of general formula (I) is 2′,3-bis[(3-[3,5-di(tert-butyl)-4-hydroxyphenyl]propionyl)]propionohydrazide.
20 . The bituminous composition as claimed in claim 16 , wherein the second chemical additive is chosen from sorbitol derivatives.
21 . The bituminous composition as claimed in claim 20 , wherein the second chemical additive is chosen from condensation products of aromatic aldehydes with sorbitol.
22 . The bituminous composition as claimed in claim 21 , wherein the second chemical additive is 1,3:2,4-di-O-benzylidene-D-sorbitol.
23 . The bituminous composition as claimed in claim 16 , wherein the bituminous composition comprises from 0.1% to 10% by weight of one or several compounds of general formula (I), with respect to the total weight of the bituminous composition.
24 . The bituminous composition as claimed in claim 16 , wherein the bituminous composition comprises from 0.2% to 5% by weight of one or several compounds of general formula (I), with respect to the total weight of the bituminous composition.
25 . The bituminous composition as claimed in claim 16 , wherein the bituminous composition comprises from 0.1% to 10% by weight of one or several chemical additive(s) chosen from the reaction products of at least one C 3 -C 12 polyol and of at least one C 2 -C 12 aldehyde, with respect to the total weight of the bituminous composition.
26 . The bituminous composition as claimed in claim 16 , wherein the bituminous composition comprises from 0,15% to 5% by weight of one or several chemical additive(s) chosen from the reaction products of at least one C 3 -C 12 polyol and of at least one C 2 -C 12 aldehyde, with respect to the total weight of the bituminous composition.
27 . The bituminous composition as claimed in claim 16 , wherein the sum of the weights of the compounds of general formula (I) and of the chemical additive(s) chosen from the reaction products of at least one C 3 -C 12 polyol and of at least one C 2 -C 12 aldehyde represents from 0.2% to 10%, with respect to the total weight of the bituminous composition.
28 . The bituminous composition as claimed in claim 27 , wherein the sum of the weights of the compounds of general formula (I) and of the chemical additive(s) chosen from the reaction products of at least one C 3 -C 12 polyol and of at least one C 2 -C 12 aldehyde represents from 0.3% to 7%, with respect to the total weight of the bituminous composition.
29 . The bituminous composition as claimed in claim 16 , wherein the ratio of the weights of the compounds of general formula (I) to the weight of the chemical additive(s) chosen from the reaction products of at least one C 3 -C 12 polyol and of at least one C 2 -C 12 aldehyde in the composition is from 0.1 to 10.
30 . The bituminous composition as claimed in claim 29 , wherein the ratio of the weights of the compounds of general formula (I) to the weight of the chemical additive(s) chosen from the reaction products of at least one C 3 -C 12 polyol and of at least one C 2 -C 12 aldehyde in the composition is from 0.2 to 5.
31 . The bituminous composition as claimed in claim 16 , wherein the bituminous composition comprises from 70 to 99.8% by weight of one or several bitumen bases.
32 . The bituminous composition according to claim 16 , which is a road binder.
33 . A process for the manufacture of bituminous mixes comprising at least one road binder and aggregates, the road binder being chosen from the bituminous compositions according to claim 16 , said process comprising at least the following steps:
1) heating the aggregates at a temperature ranging from 100° C. to 180° C.,
2) mixing the aggregates with the road binder in a vessel,
3) obtaining bituminous mixes.
34 . The process as claimed in claim 33 , which does not comprise a stage of heating the road binder before it is mixed with aggregates.
35 . A process for the transportation and/or storage and/or handling of bitumen, said method comprising the steps of:
preparing a bituminous composition in a solid and divided form as claimed in claim 17 ,
transporting and/or storing and/or handling the bituminous composition at ambient temperature.