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if u know what I mean

check the contract u have with the supplier. u can reject the concrete if it mention from batching plant to receiving is more than the allowance in contract.

beside that u didn't carry out slump test? it will probably fail as the workability couldn't achieve

that's why u have to be careful when u order concrete. tell them ur requirement. I believe ur project also got spec. for concrete right? eg. if the concrete spec. require is 30 minutes for concrete to be mix (in batching plant) and completion of placing at site. for pump mix is 2 hours, then u have to tell the concrete supplier to comply at beginning.

if the clerk of work is competent, he see the delivery of concrete already take 2 hours, he will reject and not allow u use that concrete.

ya. that's abt competency. not easy I must say, coz it also involve of a lot of pipu inside this construction work.

DO sign by main contractor for the purpose of the supplier claim from u. clerk of work sign more on acknowledgement of the rebar had come to site. perhaps that 1 can be used to claim material on site

For point 3,
It is one of the most discussed topic for people who work in construction line.
We usually compare client / developer / consultant and contractor.

In short, we can conclude that.. it is pretty shit when you are not bosses of the company.

But as a employee usually working as client / developer will be more "valuable".

Consultant / contractor can be very subjective.. as long as one is capable and they can be well paid.
As company earning, contractor usually have better margin compare to consultant. But of course contractor always has higher risks. (cash flow problem.. not getting paid, screw up project and lose money)

Because they just have to like instruct people to work for them only? coordinate and manage ppl.
All the design liability is on consultants?
Usually higher paid?

Are you someone in the industry?

Anyway this is my personal opinion. There will be never ending discussion if really need to.

With IR / certified professional engineer working in consultancy firm or setup own consultancy company can earn as much as the developer project manager / head of projects.

However, if you are someone in the field you will understand there is no 100% good design, there is a lot of compromise here and there, you take risk of your design, get complaints on and off because of design oversight, etc etc.

Working as the developer side may get the same complain but they may just simply taichi it to the consultants.