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I poured three 4'x4' slabs to make a walkway beside my house. The first two look alright but the third one is a half inch lower than the one next to it and slopes up at the open end where I want to pour six more slabs. Of course I wanted my slabs to slope down the walkway but my third slab slopes back the wrong way.

Is there something I can use to fill this half inch and get it to slope the right way, or at least make it somewhat level?

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Do you have any pictures? – DMoore Nov 4 '13 at 15:33
Yes, pictures, please hehe – oscilatingcretin Nov 4 '13 at 19:51
If it is not engaged with the adjoining slab, and if you have a use for a 4x4 pad at another spot, then relocate it. If you do not have another use for it, then for the next pad, excavate 3 inches deeper and move it there: tilt it up; clean off most of the dirt; pour about 1" of concrete in the bottom of the new location (to provide uniform bearing); lay it in place; then finally pour a 2" slab on top per @Bryce answer. – mike Nov 4 '13 at 22:37

A number of the low aggregate rapid set cements are good for applications down to a 1/2 inch. The patch is best made when the old cement is still fresh, and for good measure use some concrete bonding adhesive.

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