what happened to my driveway

[coldwaken]

hi, can anyone tell me what happend to our driveway and how to fix it? why it turns to white and can't wash away? thanks.

[Tweets77]

Perhaps some sort of acid spill? (vinegar or some such thing? I would turn the stone right over and not worry about it.

[Ciel]

Salt? Friction or impact of some kind? Chemical reaction? Spill that never left...
As suggested above, the turning over the brick part could be the most cost-effective-unless that is jointing sand, which contains plastics that activate when wet (thanks to Vanilla Ice's home reno show I know this sand is different) to harden into place! Look into that before removing the brick.

http://www.ehow.com/info_8396657_ing...ting-sand.html
But keep an eye out on activities in that spot for clues as to what might be creating the lighter surface.