Bitumen emulsion-based composition
View Patent ↗The invention concerns a bitumen emulsion-based surfacing composition or bituminous mix consisting of an amphoteric surfactant and its use in road highway engineering for making materials for new roads, for reinforcing or maintaining old roads or for punctually repairing same.
1. Paving composition consisting essentially of:
i) 0.5 to 30% by weight of a bitumen emulsion consisting of:
(a) 0.1 to 3% by weight of an amphoteric surfactant chosen from the compounds of formula (I) or (II)
in which:
R 1 is a linear or branched, saturated or unsaturated aliphatic group having 6 to 24 carbon atoms;
R 2 is a linear or branched, saturated or unsaturated aliphatic group having 2 to 6 carbon atoms, at least one of these carbon atoms optionally being substituted by a hydroxy group;
R 3 and R 4 are linear or branched saturated or unsaturated aliphatic groups comprising from 1 to 4 carbon atoms, wherein R 3 and R 4 may be identical or different;
R 5 is a linear or branched saturated or unsaturated aliphatic groups comprising from 1 to 6 carbon atoms, at least one of these carbon atoms optionally being substituted by a hydroxy group;
Y is an SO3 − or COO − group;
Z is an SO3 − or COO − or OH group;
b. from 30 to 95% bitumen; and
c. water in sufficient quantity to make up the emulsion;
ii) from 70 to 99.5% by weight of aggregates;
iii) from 0 to 20% by weight of total water.
2. Paving composition according to claim 1 , wherein the bitumen emulsion is between 2 and 15% by weight of the weight of the paving composition.
3. Paving composition according to claim 1 , wherein the aggregates are between 85 to 98% by weight of the weight of the paving composition.
4. Paving composition according to claim 1 , wherein the amphoteric surfactant is present in said bitumen emulsion in a quantity of between 0.5 to 1.5% by weight of the bitumen emulsion.
5. Paving composition according to claim 1 , wherein the bitumen is present in said bitumen emulsion in a quantity of between 45 and 80% by weight of bitumen emulsion.
6. Paving composition according to claim 1 , wherein R 1 is a mixture of aliphatic groups derived from coconut oil.
7. Paving Composition according to claim 1 , wherein R 2 is a linear group with 3 saturated carbons.
8. Paving composition according to claim 1 , wherein R 3 , R 4 , or R 5 represents a methyl or ethyl radical.
9. Paving composition according to claim 1 , wherein the amphoteric surfactant is one of cocoamidopropyl betaine, cocoamidopropyl hydroxysultaine or cocoamphoacetate sodium salt.
10. The paving composition according to claim 1 wherein the amount of water is from 1 to 15% by weight of the emulsion.