Underpinning an outbuilding

[geraldthehamster]

I'm underpinning one long wall and one corner of a 5.5 x 3.6m outbuilding, walls 2m high in single brick, with pillars. It was built decades ago on a floor slab 2 or 3 inches thick, on soil, and as a consequence the outside wall has moved (no proper restraint between the rafters of a shallow roof hasn't helped - now rectified). I'm only doing one side because the other has a garage slab against it and isn't going anywhere.

My question - I'm digging a trench the width of an edging spade, to a depth of about 10 inches below the existing footing, extending inwards just beyond the inside of the wall, under the slab. I've dug and filled the front corner, and about 1200 along the side. How long should I leave the concrete to cure before digging the adjacent section? Is it advisable to continue the next day?

Cheers
Richard

 

[noseall]

Next day will be fine, by then the concrete will be stronger than the soil it's sitting upon.