Flushed and unflushed chipseal samples were taken in 1997–98, near sites where flushing had occurred on state highways in the Wairarapa, New Zealand.
The unflushed seals were tracked with a weighted wheel in a temperature-controlled cabinet, and the changes of texture depth occurring during approximately 100,000 wheel passes were measured. Bitumens from flushed seal samples were characterised rheologically.
The results were analysed to determine factors controlling the occurrence and degree of flushing resulting from trafficking of chipseal surfaces.
Keywords: aging, bitumen, chipseal, compaction, flushing, New Zealand, roads, traffic, viscosity