Hello, I'm currently planning a project to widen my exisiting gravel driveway. The driveway is higher than the adjacent lawn by about 1 foot so the extra section needs to be built up with hardcore and then a layer of concrete with top layer of gravel all against a retaining wall. I would like some advice here as to what thickness would be best for the hardcore and concrete layers.
Based on some advice so far I am thinking to use 6 inches of concrete (correct me if you think this is unnecessary) which would require approximately 0.5 metre cubed concrete. My question here is whether it would be feasible for me to mix this much onsite with a hired petrol powered mixer to save cost or whether I would need to order it ready mixed and delivered.
Thanks in advance for any input on these queries.