Repair of restraint cracks in parking rc slab exposed to weather.
Repair of restraint cracks in parking rc slab exposed to weather.
(OP)
Hi,
I need your opinion on a repair method for the above situation. Do i simply ream the cracks a bit wider with an anglegrinder and apply a trafficable waterproofing paint? With the paint then being applied thicker in the areas of the cracks? Or do i injection grout the cracks and paint over it with aforementioned paint?
The idea was always to "waterproof the slab" with aforementioned paint, but now these cracks have appeared and i am concerned the paint wont bridge them if simply painted over.
I appreciate your advice and comments.
Thanks.
I need your opinion on a repair method for the above situation. Do i simply ream the cracks a bit wider with an anglegrinder and apply a trafficable waterproofing paint? With the paint then being applied thicker in the areas of the cracks? Or do i injection grout the cracks and paint over it with aforementioned paint?
The idea was always to "waterproof the slab" with aforementioned paint, but now these cracks have appeared and i am concerned the paint wont bridge them if simply painted over.
I appreciate your advice and comments.
Thanks.






RE: Repair of restraint cracks in parking rc slab exposed to weather.
BA
RE: Repair of restraint cracks in parking rc slab exposed to weather.
RE: Repair of restraint cracks in parking rc slab exposed to weather.
The structure consist of 3 office levels and 1 parking. Conventional reinforced concrete structure. Columns and shear walls. Slab is 280mm thick. Cracks are approx .2mm to .3mm and i was thinking of using basf monotop or similar as trafficable waterproofing paint.
RE: Repair of restraint cracks in parking rc slab exposed to weather.
Brian C Potter, PE
http://simplesupports.wordpress.com
RE: Repair of restraint cracks in parking rc slab exposed to weather.
BASF and Sika would be my preferred manufacturers for traffficable membranes. You should have discussions with approved applicators in your area.
RE: Repair of restraint cracks in parking rc slab exposed to weather.
RE: Repair of restraint cracks in parking rc slab exposed to weather.
RE: Repair of restraint cracks in parking rc slab exposed to weather.
As the slab is supported on a wall at the perimeter, the most likely reason for the cracking is restraint by the wall, resulting in tension in the slab as it shrinks. Are the cracks all the way through the slab? As you stated that "now these cracks have appeared", I take it that the crack widths are unexpected and perhaps recent. If they are direct tension cracks, they will continue to widen with time, so filling them early with a rigid material won't solve the problem.