Posted: Tue Jun 20, 2006 9:11 pm
I have a separate post on shuttering. 9m x 6.6m reinforced raft.
It is 150mm thick in centre and 300 deep for 500mm wide all around perimeter (with structurally calculated steel reinforcement)
The volume means I need 2 deliveries of C30 Readymix.
When it comes to pouring the raft, a friend has suggested that it would be worth putting in first pour, and aiming this at the thickened perimeter, and putting this in fairly stiff.
As I have to have 2 loads anyway, put a delay inbetween loads, this will allow the first pour to start setting, and then put the 2nd pour in topping up perimeter and filling in centre. He thinks this would save a lot of stress on the shuttering.
The question is two fold ... is this a good idea ? and secondly how much of a delay should I build in, too much would mean a non-consolidated raft I guess.
It is 150mm thick in centre and 300 deep for 500mm wide all around perimeter (with structurally calculated steel reinforcement)
The volume means I need 2 deliveries of C30 Readymix.
When it comes to pouring the raft, a friend has suggested that it would be worth putting in first pour, and aiming this at the thickened perimeter, and putting this in fairly stiff.
As I have to have 2 loads anyway, put a delay inbetween loads, this will allow the first pour to start setting, and then put the 2nd pour in topping up perimeter and filling in centre. He thinks this would save a lot of stress on the shuttering.
The question is two fold ... is this a good idea ? and secondly how much of a delay should I build in, too much would mean a non-consolidated raft I guess.