Air sure no problem. Slump ? got me

I can adjust the slump too, if I pump slow enough and take long enough with one load......on a hot day...I should be able to make the 5 into a 3 inch slump. Man I am special

how do you change the slump without changing the properties of the concrete??? Big No-no!!

Well what an intresting question.I would ask for a pump operator who does magic in his spare time if he has eny. when you find him dont let him go as he will be worth his weight in gold.