Concrete slab crack repairs
Concrete slab crack repairs
(OP)
We have been asked to review the design of a post tensioned concrete slab. The slab has cracks in excess of 2mm wide!! A repair methodology has been suggested by others, a cementitious grout will be injected under into the cracks.
Normally I would have thought they'd use a low viscosity expoxy which is much more effective in reaching the full depth of the crack as it relies on gravity.
If anyone has any experience in pressure grouting of cracks, I would appreciate if you could offer some advice.
Thanks
Normally I would have thought they'd use a low viscosity expoxy which is much more effective in reaching the full depth of the crack as it relies on gravity.
If anyone has any experience in pressure grouting of cracks, I would appreciate if you could offer some advice.
Thanks






RE: Concrete slab crack repairs
One reason higher viscosity materials such a cementitious grouts are chosen is the belief that the cracks are so wide that the "thinner" material will just run out. Proper procedures of placement and experience with the material can control this so that proper repairs are made.
Check the International Concrete Repair Institute for additional information
RE: Concrete slab crack repairs
It would be helpful to know your opinion of the reason for the cracking. Are they direct tension cracks extending through the slab or some other type of crack? How thick is the slab? How much tensioned steel? How much untensioned? Bonded or unbonded?