Hi,

We have a job coming up in england for exposed aggregate concrete, the mix design is along the lines of 500 litres/m3, gap graded crush stone, grade range 6-10mm, CEM I 320kg/m3, sand 0/2 about 600kg/m3.

Now, am i going to be able to pump this mix though a 40-45m line? I am intending on hiring a squeeze pump, the putz roline, i know a piston pump is out of the question (because theres to much reduction?) 

Has anyone had any experience with this type of mix, any advice would be much appreciated.

Thanks

we pump exposed through all of our booms from 28_48 try to get the batch plant to put more fines in for you we push it around 80-120 slump no problems

We can't pump  exposed agg at all cause they use about 2200 lbs of pea gravel even Boom guys want try it,I would stay away from a Squeeze pump.

Exposed aggregate scares me. I've had jobs that wouldn't even pump through the turret. I don't know, who buys if it doesn't pump. Large amounts of small rock in a mix tend to pack.

 Mix design is again the key issue. We can pump some of those mixes here but not all. everything from type of rock. sand , and cement content make a big difference. The best way to figure it out is talk to the ready mix supplier, and even make a test pour.

The above advice is the best bet. Before we started on a tunnel pour we were working on, pumping 2500+ feet underground we did a test pour to make sure the pump could do it. It worked, so we did the job

if the cutting ring in a piston pump is nice and tight and the exposed isnt all gravel, it'll pump it just fine. it doesnt matter whats pushing it once it gets to the reducer, piston or squeeze, if it wont reduce, its the concrete, not the pumps fault.