clogs wrote:also out of interest,
the waterproofing agent for concrete doesn't like steel.....?
that was what I was told.......?
my new shed will approx 160m2.....I want a 150mm thick base due to loading and ground conditions....
the ready-mix firm wont deliver up my hilly drive.....and the conc pump wont reach from the road....
(read track) so might need two pumps....
so far this looks like it will be done by hand in 2m strips x3m long .....unless I get lucky with another conc firm....
all the fun of the fair......hahaha....
Waterproofing additives are used with steel all the time. In fact, because their role is the prevention of micro-cracks which allow the passage of water, I doubt they're ever used
without steel reinforcing. However, once you get into reinforcing and waterproofing, you are into a structural engineer's territory. I'm not sure, though, why you would need a waterproof concrete unless you were building a retaining wall or an underground structure.
Even the most efficient shape for 160 sq metres of base suggests a minimum concrete depth of 270mm unreinforced. 150mm sounds thin to me even for a reinforced slab. I would certainly recommend you employ a structural engineer for a slab that size.
Have you considered hiring a dumper to ferry the concrete to the pour site? You are also going to need to get your ducks in a row with regards spreading, levelling, tamping and floating a slab of that size. Anything above 30 square metres is a challenge for 1 person, and I suggest you are going to need 4 or 5 people, and at least a couple of them need to be skilled.