Mix mortar and concrete?

Old 05-10-07, 01:08 PM
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Mix mortar and concrete?

I'm about to lay out a new sidewalk. I have free access to (literally) tons of broken-up concrete in all sizes and considered using some of the smaller pieces for the base. This lead me to wondering if I couldn't use the larger pieces, as well, so that I might end up with a 6 inch slab but by only using an amount of new concrete equal to what one might use for a 3 inch or so slab. Will the new concrete bond well enough to the old? Would this work?

It seemed to me it would be more appropriate to use mortar for this. Is it feasible to first pour a layer of mortar to bind the chunks and then, while still wet, follow up and finish it off with an inch or two of concrete?

In other words, can you mix mortar with concrete?

Old 05-10-07, 01:30 PM
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The only way to reuse old concrete in new concrete is to crush it to 3/4" size or less. You could mortar the old slabs together provided they are flat, top and bottom, though.

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