Concrete slab surface repair
Concrete slab surface repair
(OP)
I am discussing repair of the surface of exterior slabs on grade with a property owner. The slabs were exposed to 2 or 3 unknown chemicals that have discolored and mildly etched the surface. The owner is adamant that no coatings or cementitious overlays be used for fear of poor long term performance. When I suggested sand blasting and/or grinding, he questioned whether the durability would be decreased.
I suspect we will only lose 1/16" to 1/8" of the surface to get rid of the effected concrete. The area is prone to freeze thaw and extremes of hot and cold weather. My thinking is that, if anything, blasting or grinding should remove the upper layer of cement paste and leave a stronger, possibly less porous surface unless we uncover air voids from poor consolidation or voids any exposed aggregate. Any thoughts or references to support or argue against my thoughts on this?
Thanks
I suspect we will only lose 1/16" to 1/8" of the surface to get rid of the effected concrete. The area is prone to freeze thaw and extremes of hot and cold weather. My thinking is that, if anything, blasting or grinding should remove the upper layer of cement paste and leave a stronger, possibly less porous surface unless we uncover air voids from poor consolidation or voids any exposed aggregate. Any thoughts or references to support or argue against my thoughts on this?
Thanks





RE: Concrete slab surface repair
As for using sand blasting, that could cause micro-cracks in the near surface concrete which could decrease durability. I would suggest a non-impact grinder.
RE: Concrete slab surface repair
RE: Concrete slab surface repair
Dik
RE: Concrete slab surface repair
GeoPaveTraffic - my one hesitation about grinding is the fear that the resulting surface might become too slippery for foot traffic in bad weather.
Thanks to both of you for the responses,
sennafan
RE: Concrete slab surface repair
RE: Concrete slab surface repair