has anyone ever expirence line pumping concrete that was not air entrained, but when tested at the end of my hose, the air increased over 2.5%. the mud company and i are at a loss.

If the mud is falling a long ways from the boom or you added too much water(or both) it can happen.  It's happened to me before. 

Usually, if you added water onsite, you can get the inspector to mix it up a bit to release the air and test again.  Also, the testing perameters say he "needs to take a sample from the point of placement."  This is usually a pain in the ass for them but if they raise hell, you can ask him to take it there and check for air.

Sorry, I misread.  But it is probably from the added water onsite or how he is sampling.

Make sure he samples at the truck to be sure it is getting air from the pump somehow and the mud is 0% air from the get go.  But, usually, if he mixes the mud a bit before he tests, that will get you back to kosher.

 Do you know if there's some sort of water reducer in the mix? I've seen some admixture products do this such as Adva & Adva 100. 

 Air tests at the hopper were in spec. at 4% to 6% but out the end of the hose was sometimes as high as 11%!! Took a different pump to the job, an older 32/1200, and had NO problems. The only reason I could think of was that the older pump did NOT have an accumulator and did'nt stroke or shift as hard.     

Tough question but I suspect the test guy is getting some trapped air in the meter. Entrained air is micrscopic but a couple of bubbles of entrapped air will test really high.

I have to agree,inexperienced tester/calibration would be the best starting point.I woudn't rule out some admixtures,however.

Another tip,have the tester and plant do comparitive tests.

to tall if you add more additive dosage ofcourse it will increase the air content this is one of the defects of increasing additives but you will get more slump and strength 

 happens all the time and the only thing i could come up with is the material cylinders has a void of air at the top end of each stroke, the cylinders don't completely fill with mudd and every stroke introduces air in to the mix .may be wrong but it's about the only thing that really makes any sence.

hey do you have any data that would proove this?

sorry, pumper chuck. I think that you are right. when i line pump this job around 250-300 ft the air % is higher at the end of the hose than what it is going in too the pump.

oh yaeh, the mix is striaght 6 sack, but does have 1.5" stone in it too.