hayden
Veteran Member
I mixed and poured about 5 bags of concrete mix a week ago, and today checked on it and I can crumble the concrete with my hand. Any ideas what might have gone wrong? After 7 days I'd expect it to be good and solid. Not full strength, but solid. Instead, I was able to crumble a chunk that broke off when I removed the wood form. Other droppings around the form are also easily crushed. I also mixed some mortar mix at the same time and used it in and around the same area, and it's good and hard as I'd expect.
For more details, read on. My pour is backfilling the corner of an old granite block foundation where it was not properly supported. I believe I mixed it properly (not too wet, not too dry). The form was a combination of wood, earth, and the granite. It's been cold, but it didn't freeze in the first few days. Night time temps are probably in the high 30's to low 40's. Could that be it?
Does Sakcrete go bad? The bags I used are about 3-4 years old, but they've been in a closed shed. The contents were a bit lumpy when I mixed it, but it was otherwise dry. I recently tried using an old bag of mortar that had been stored in a damp location, and had a similar problem, but in that case most of the bag was hard as a rock.
Thanks for the help
For more details, read on. My pour is backfilling the corner of an old granite block foundation where it was not properly supported. I believe I mixed it properly (not too wet, not too dry). The form was a combination of wood, earth, and the granite. It's been cold, but it didn't freeze in the first few days. Night time temps are probably in the high 30's to low 40's. Could that be it?
Does Sakcrete go bad? The bags I used are about 3-4 years old, but they've been in a closed shed. The contents were a bit lumpy when I mixed it, but it was otherwise dry. I recently tried using an old bag of mortar that had been stored in a damp location, and had a similar problem, but in that case most of the bag was hard as a rock.
Thanks for the help
