Replies

1. 
   YesMaam27577 | Jun 01, 2009 02:17am | #1

   I'd start by bleaching and power washing the existing stuff. Then do whatever you think is needed to match color.

   If you don't get the old stuff clean, you won't know.

   Politics is the antithesis of problem solving.
1. 
   brownbagg | Jun 01, 2009 03:28am | #2

   the more cement the darker it will be

1. 
   KFC | Jun 01, 2009 04:40am | #4

   It'll probably be a six-sack mix.  That's still pretty white compared to old, old concrete.

   Any guesses on lampblack per yard?

   It doesn't have to be a perfect match, just close enough that it doesn't leap out at you.

   thanks,

   k

2. 
   KFC | Jun 01, 2009 04:47am | #5

   "I'd start by bleaching and power washing the existing stuff. Then do whatever you think is needed to match color.

   If you don't get the old stuff clean, you won't know."

   There's something to that- I realize some of this is surface dirt.  But we all know it darkens over time, too.  I bet if I took a core of the sidewalk in question it'd be almost uniform.

   Regardless, I'd have to wash and bleach the whole sidewalk to keep the bleached section from popping out visually, so I'd like to just dye the new part if possible.  I've gotten it close when mixing my own, but I'm curious if anyone has ever ordered a batch for this very purpose.

   I'll ask the ready-mix guy on Monday, I guess.  Those guys are sometimes helpful with questions, sometimes not.

   Actually, Larm's Masonry Supply in Oakland/San Leandro might be a good place to call, now that I think about it... (for all you locals).

   k

   k

2. 
   dedubya | Jun 01, 2009 04:05am | #3

   If it is type 1 or type II GOOD LUCK as  most newer cements are type1/II mix, manufactored at the plants that way and color fluctuates somewhat differant shades of grey every two months or so.