I have a 6’X8′ exterior concrete slab (a back porch) that has a manhole cover set into it and that has been painted several time; much of the paint has peeled off. It looks awful and leaks along the side that joins the wall, which is made of brick. There is an awning above the slab.I’d like to refinish it and am looking for ideas.
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Once you get all of the paint off, you can put a "microtopping" over the existing solid slab. Microtoppings are specially blended ceements that have adhesives, binders, a lack of aggragate, and a whole lot of cement. They come in prepare mixes ($$$) or I've seen some boys mix up their own. It's like troweling on a new surface.
But it don't work if you don't get the old paint and dirt off first. Most people use a shotblaster to do so. A sandblaster could do the same more slowly.
jack hammer
Are you sure this isn't the top of your septic tank?
Usually slabs with large openings, such as manholes, are the top of what ever the manhole accesses.
when I had a rained on sidewalk or driveway, my concrete contractor would do the following:
I bag of Quickrete Vinyl Patch (The yellow bag with the blue writing)
1 Gallon of white bonding agent.
1)Hose the slab down to remove all grit and dust off (you have already pressure washed the paint off...right?)
2) While the slab is still wet, pour half the gallon (or less) on the slab and spread it out with a broom
3) Mix the 40#bag of VinylCrete in a wheelbarrow with the rest of the bonding agent untill it is a soupy (not watery) mix.
4) Spread it out with a trowel, approx 1/8" thick. Let set up a little and you can add a broom finish.
Because I was building tract homes where the afternoon rains in the spring were unpredictable, I have used this technique on over a hundred drives. The ONLY call-back I had was when I was too lazy to grind off the loose portland down to the aggregate.
Quickcrete has a blue bag called resurfacer, but it did not work NEARLY as well