Need a bit of guidance here,
I have tough yard and my contractors are going to pour concrete over some large boulders and filled in the remaining area with parts of other boulders (6in to 1 foot). They are planning on using rebar but not much else. I have read this is not optimal but they are pretty deep into the project now – thoughts? Should I ask them to use extra rebar? Adjust the concrete mix so it is more liquid? Wet the rocks jut in advance of the pour so the concrete binds better. Any help you can provide is genuinely appreciated, a bit outside my comfort zone here.
Best Answer
A vibrator will get excellent penetration of regular concrete into the broken rock. Adding more water to concrete mix reduces the strength. I poured a car park addition to a drive way using broken concrete from a sidewalk . The concrete minimum thickness was 2 " or less . It was in fine shape 10 years later when I moved . Of course I doubt it would be strong enough for moving traffic.