Newly built or recently
rehabilitated tennis courts should last for many years; however, some
playing surfaces are cosmetically damaged or structurally impacted by
the effects of aggregate contamination. Caused by pyrite (iron particle)
contamination of the aggregate in asphalt concrete pavement, these cosmetically undesireable spots and
streaks on the playing surface detract from the beauty of courts so
affected, even becoming a distraction to players, and are sometimes
capable of causing localized surface failures.