Rustey colored patch
#1
07-20-14, 01:04 PM
Rustey colored patch
This is just curiosity and no problem involved. Recently I patched a piece of sidewalk using TOP and BOND. I've done this once before for this same spot many years ago. It now needed a re-patch. This time it dried to a rusty color. I can't figure out why. Never did it before nor has any of the other spots I repaired that same day. The rest of the existing sidewalk is the usual worn grey color. Several other patched never discolored. What made this particular spot go rusty?
#2
07-20-14, 06:30 PM
Member
My guess would be traces of rust in the bottom of the container (wheelbarrow or bucket?) you used to transport either the fluid mix or even the mixing water itself. A long shot would be contaminated product, possibly from production equipment not being thoroughly cleaned following a batch of colored product having been made. In the old days, Embeco, one of the first concrete repair products on the market, contained steel filings as an anti-shrink additive, and commonly rusted when exposed to weather (as the filings expanded as they corroded).
#3
07-21-14, 02:56 AM
Since its on the edge of the walk, I would guess the discoloration is dirt. Is this an overlay or a full depth pour where concrete was broken out? I realize you said top and bond, but just checking that the material was used properly. Looks like your material was very wet and dirt bled up to the top. Possibly the slab not cleaned well enough prior to topping? Dirt bleeding in from planting bed?
#4
07-21-14, 06:02 AM
Bridgeman and Peco,
The mix was done only using plastic containers. Other spots using the same mix did not discolor. I guess it could be considered a full depth repair. I don't think it was dirt, as I cleaned the area pretty good before hand. My thought is that some iron in the surrounding soil must have leached into it and was drawn to the surface.
The mix was done only using plastic containers. Other spots using the same mix did not discolor. I guess it could be considered a full depth repair. I don't think it was dirt, as I cleaned the area pretty good before hand. My thought is that some iron in the surrounding soil must have leached into it and was drawn to the surface.
