Discoloration issues on new concrete.
New concrete walls have black areas.
And till date the concrete still has discoloration and lots of splotchy mottled spots like leopard as you can see in the 1st pic.
While it generally cures in a uniform fashion sometimes cement will have dark splotches that show on the surface as the material cures or dries.
Favorite answer the spots you are seeing are due to the aggregate in the concrete.
Concrete is a mixture of sand crushed stone or gravel and a paste consisting of water and portland cement.
The day they installed the concrete it was hot about 80 degrees and very windy.
Black stains on concrete consist of layers of dirt and oil chemicals ink or other substances.
Use less aggressive stamp patterns.
Why would holes appear on a brand new concrete driveway.
When removing a black stain from concrete it is important to completely remove the stain s multiple layers to keep new dirt and debris from reattaching to the stain s top layer.
A frequent reason behind a darkened concrete appearance is the addition of calcium chloride to accelerate the setting time of concrete see photo 1 especially when calcium chloride dosages approach 2 by weight of cement.
1 large areas of contrasting color 2 black spots or dark leopard spots.
Dark colors show everything especially all the chemical residue from pool water including chlorine bromine and salt.
The combination of substances become darker as layers of dirt accumulate on top of the stain.
Use light colors for the slab.
But concrete can become discolored due to conditions present in the concrete itself or as a result of external factors.
Depending on the concrete that was ordered you may have river gravel smooth rocks or crushed limestone a.
A month ago we had a new patio north facing and sidewalk installed with broom finish.
It becomes stronger and.
There are many causes of discoloration on a concrete surfaces and the solution will vary depending on the cause.
We are in vancouver bc canada.
Concrete discoloration dark spots stripes and blotchy concrete.
And 3 white patches caused by efflorescence.
It looked like hardened cement that had dried on top and was darker in color than the rest of concrete.
Concrete is a fairly straightforward mixture of cement sand and water that is used in driveways basement slabs sidewalks and even streets.
They applied a top cast per our request to expose some aggregate and left.
Concrete discoloration comes in the form of dark spots stripes blotchy areas and color differences.