How can I repair my concrete slab corner that was washed away by heavy rain overnight despite having a tent covering it?
Asked by Dave Coleman 
3 months ago
Last Updated: September 8, 2024
Hey, so I just finished pouring this little landing and then we had a crazy downpour last night that ended up washing away some of the concrete in one corner. Any thoughts on how I can fix it? I thought I had it covered with a tent, but apparently there was a leak that caused the damage.
Have you put a tarp or plastic over it?
Hey Ricky! Yeah, I did notice that there was a big leak in that corner which caused the cement to wear away. The rest of the slab looks good though!
That’s unfortunate, eorge Buruschkin. You’ll have to patch it up then.
Wait for around 30 days before proceeding. Use an angle grinder with a cup wheel to prep the surface, clean it, and consider using the product linked here or something similar: https://www.jondon.com/rapid-set-skim-coat-ea.html?utm_source=google&utm_medium=cpc&utm_term=&utm_content=&utm_campaign=21021561307&hsa_acc=1905229250&hsa_cam=21021561307&hsa_grp=&hsa_ad=&hsa_src=x&hsa_tgt=&hsa_kw=&hsa_mt=&hsa_net=adwords&hsa_ver=3&gad_source=1&gbraid=0AAAAAD_wpd4jx2Vonmn1S5WcaLmbV_AJA&gclid=CjwKCAjwt-OwBhBnEiwAgwzrUlYBH0xCYo9d-8EayBKPiMbPnFZMeXwRmqAdqKtmj85X34ugv6WnzBoCo0YQAvD_BwE
I’d start by focusing on removing the cement mess from the brick. Then, you can look for a latex exterior patching cement in powder form without any aggregate. It may not match perfectly, but a latex mix tends to dry whiter than plain portland cement and will help with bonding. Once you patch it, use a wet brush to blend it in, and repeated brushing will lighten the color. Best of luck.
Use hydraulic cement to quickly patch it up by adding more water to the mix.
Mix some sand with Portland cement in a 3 to 1 ratio and use it for a skim coat. Make sure to work fast because the adhesion weakens after 48 hours.
Looks like you’ve got your work cut out for you cleaning that brick. What a tough job.
I’d suggest chipping down about an inch into the area that needs patching, then mix up some more concrete and trowel it in. It will be “hard,” but not fully cured, so it should chip fairly easily. Just be gentle to avoid cracking the remaining concrete. The roughness of the chipping will help the new concrete adhere well.