we laid a concrete pad last Friday 9am and 11am tips (8 + 5cube so not much at all) at 4 am the next morning we abandoned trying to power float it as it would not go off. (my alarm went of at 3am so I was late for work milking!!!) its a c40 concrete but has plasticizer in which power float mixes don't normally? what is surface grinding like to try and get a polished finish? what do you think the concrete company should be doing about it they are saying the concrete is fine and will gain adequate strength. but we are not happy with the finish. we have 2 things who should pay for the 12 hours we spent extra on the pad more than we should have? (the concrete came with a verbal warning that it might start to go after 2 hours) and who should pay for the surface grinding which would not have been required? (cost would be 3 men for 12hrs extra + surface grinding) or do we rip it our and start again? (cost would be 3 men for 2o hours laying slab! + cost of ripping out and re setting forms) I cant really understand why they don't stomach it and off set the cost across the rest of our jobs wouldn't be 10%!