Page 189 - Handbook of Adhesion Promoters

182 Selection of Adhesion Promoters for Different

9.5 BITUMEN

Moisture damage is the major reason for premature failures that worsens the performance
1
and shortens the service life of pavements. A reactive adhesion mechanism operates
when urethane bond linkages are created between the free isocyanate groups present in
polyurethane added to bitumen and the hydroxyl groups of the siliceous aggregate,
1
improving the asphalt mixture resistance to moisture damage.
The organosilane modifier (P2KA Kimical SRL) guarantees excellent performance
2
at 0.01 wt% loading and almost complete resistance to water at 0.03 wt% loading. The
organosilane modifier penetrated the surface of the stone, thus aiding anchoring of the
2
binder to the surface.
The adhesion promoter for bitumens was obtained by the esterification of a polyhy-
dric alcohol having at least three hydroxyl groups, with a carboxylic acid having 12-22
3
carbon atoms.
REFERENCES
1 Cuadri, AA; Partal, P; Ahmad, N; Grenfell, J; Airey, G, Constr. Buildg. Mater., 93, 766-74, 2015.
2 Rossi, CO; Caputo, P; Baldino, N; Szerb, EI; Teltayev, T, Int. J. Adh. Adh., 72, 117-22, 2017.
3 Nordberg, J; Hagberg, D; Gorochovceva, N, WO2014067929, Akzo Nobel Chemicals International B.V.,
May 8, 2014.