How to fix a crack in concrete slab

Old 06-20-16, 05:46 PM
Thread Starter
Join Date: Oct 2013
Location: Canada
Posts: 6
Upvotes: 0
Received 0 Upvotes on 0 Posts
How to fix a crack in concrete slab

Hi there,

The slab that makes up the floor of my unenclosed porch has a fine crack that runs across it. It looks like someone tried to patch it at one point but we have occasionally noticed water dripping into the cold room under the porch.

I also noticed something like rusted metal exposed in crack on the underside of the slab, in the ceiling of the cold room. Would this likely be a piece of rebar?

Any ideas on how I should approach properly repairing this? Also, are there any structural concerns with having the slab cracked like this?


Name:  IMG_20160620_195424599.jpg
Views: 701
Size:  19.8 KB

Name:  IMG_20160620_195505374.jpg
Views: 1264
Size:  36.4 KB

Name:  IMG_20160620_195711095.jpg
Views: 1123
Size:  20.7 KB

Name:  IMG_20160620_195724402.jpg
Views: 553
Size:  32.8 KB

Name:  IMG_20160620_195738891.jpg
Views: 443
Size:  18.6 KB
Old 06-25-16, 05:34 AM
Join Date: Mar 2007
Location: Oregon
Posts: 881
Received 24 Upvotes on 23 Posts
Can't help on structural about Zypex a hydraulic cement that is supposed to seal up cracks in concrete.
Old 06-26-16, 12:51 PM
Join Date: Dec 2013
Location: usa
Posts: 1,239
Received 1 Upvote on 1 Post
typical deterioration when 1 doesn't properly seal a conc surface,,, wtr penetrates & causes rust on the rebar which then expands spalling the concrete,,, from the pictures, i'd guess the rebar isn't in the middle of the slab but, rather, in the lower part of the slab,,, i'm guessing the crk closely follows the rebar,,, we've got some suspended walkways to repair w/same issue
Old 07-07-16, 10:15 AM
Join Date: Feb 2004
Location: wv
Posts: 392
Upvotes: 0
Received 0 Upvotes on 0 Posts

Can you tell us how thick the slab is and the width it spans, this will determine what can be done with repairs.

Thread Tools
Search this Thread
Ask a Question
Question Title: