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<blockquote data-quote="sierra1995" data-source="post: 173409" data-attributes="member: 1059">it's a by product of the crushing operations. Crushed concrete makes a very good surfacing material for driveways and other gravel applications. You want to drain any moisture away to prevent heaving, same reason why most roadways are built on gravel and not clay. But as far as the patio is goes, i would not recommend placing new concrete over crushed concrete. The reason is that the new concrete will bond to the crushed, and will re-activate any cement left over in the crushed concrete. You'll end up with a slab twice the thickness, which may sound good, but it will crack differently than a standard 4&quot; slab on gravel.Just go with the pit run gravel as your base. If you want to spend a bit more money, put some heavy duty fabric down to separate your clay from the gravel. Also, I would just use Macro Fiber polypropylene (Mac Matrix) reinforced concrete, not steel. It's only a patio and the macro fibers will hold any uncontrolled cracks as good as or better than steel. Whatever you do, avoid welded wire sheets at all cost!</blockquote>

[QUOTE="sierra1995, post: 173409, member: 1059"] it's a by product of the crushing operations. Crushed concrete makes a very good surfacing material for driveways and other gravel applications. You want to drain any moisture away to prevent heaving, same reason why most roadways are built on gravel and not clay. But as far as the patio is goes, i would not recommend placing new concrete over crushed concrete. The reason is that the new concrete will bond to the crushed, and will re-activate any cement left over in the crushed concrete. You'll end up with a slab twice the thickness, which may sound good, but it will crack differently than a standard 4" slab on gravel. Just go with the pit run gravel as your base. If you want to spend a bit more money, put some heavy duty fabric down to separate your clay from the gravel. Also, I would just use Macro Fiber polypropylene (Mac Matrix) reinforced concrete, not steel. It's only a patio and the macro fibers will hold any uncontrolled cracks as good as or better than steel. Whatever you do, avoid welded wire sheets at all cost! [/QUOTE]

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