| 摘要 |
<p>According to the invention, a slow setting bitumen-aggregate mix for cold paving is manufactured by a) preparing a cationic oil-in-water emulsion of bitumen in the presence of an emulsifier containing i) a tertiary polyamine selected from the group consisting of a di(C<SUB>2</SUB>-C<SUB>3</SUB> alkylene)triamine, a tri(C-<SUB>2</SUB>C<SUB>3</SUB> alkylene)tetraamine, a tetra(C<SUB>2</SUB>-C<SUB>3</SUB> alkylene)pentaamine, a penta(C<SUB>2</SUB>-C<SUB>3</SUB> alkylene)hexaamine, a hexa(C<SUB>2</SUB> C<SUB>3</SUB> alkylene)heptaamine or a mixture thereof, which amine compounds have only tertiary amine groups and contain one or two aliphatic groups with 8-22 carbon atoms, bound to a nitrogen atom, while the remaining nitrogen substituents are methyl groups and ii) an acid present in such an amount that the aqueous emulsion obtains a pH value from 1-6, preferably 1.5-5, and b) mixing the aqueous emulsion obtained with a solid aggregate. The present invention also comprises a tertiary polyamine selected from said group of tertiary polyamines or a salt thereof with an acid, a process for the production of said tertiary amine, as well as the use of the tertiary polyamine salt as an emulsifying or cohesion increasing agent.</p> |
