Slump is measured by filling an inverted cone with wet, slightly compacted cement and then removing the cone form. With more water in the concrete, the concrete sags more and is said to have a higher slump. Once dry, a higher slump mix will be less dense and will be weaker than a higher slump mix. It is a lot easier to work when wet though.
Thanks cornflakes, although actually I knew that, but was interested in a description of the process of setting the slump, rather than how it is tested (unless that is what craneop2 meant).
PRINCHESTER, We do the slump as an educated guess…After a while you can see how the mix is falling off the fins…
Batch man usually mixes a little dry to allow us to add wash water then we have to determine the correct slump…We can add water BUT WOE be the the driver that adds too much water and gets to a job with a “WET” load…
PRINCHESTER, We do the slump as an educated guess…After a while you can see how the mix is falling off the fins…
Batch man usually mixes a little dry to allow us to add wash water then we have to determine the correct slump…We can add water BUT WOE be the the driver that adds too much water and gets to a job with a “WET” load…
[nitpick]
Since when? I take a one-lane road past a concrete company sometimes to plant yard signs while I’m at work, and if I’m unlucky enough I’ll get caught behind one I’m stuck doing 30 instead of 50 down this road. What universe do you live in?
[looks at user name]
oh
[/nitpick]
Anyone else remember some years back when a contractor accidently poked a hole in the Chicago river, causing a massive leak into the subterrean tunnels under the city?
Mayor Daley declared “We will plug the leak quickly”, which they did by pouring truck after truck of cement/concrete into the river over the hole until the leak stopped. The quickly part came in with cement trucks zooming up and down Wells street under police escort on blocked off roads as fast as they could go. Which is pretty damn fast, and pretty damn impressive to see such a massive object careening past at 80+ mph.
(Actually, I don’t know exactly how fast - but it was really really fast)
So, yes, they CAN go that fast, even if they don’t usually. I mean, at that speed and mass it’s gotta take awhile to slow down so just from a viewpoint of safety (presumably the driver wants to live) they must be careful with the speed on those things.
Cement trucks going 70-80 mph???
Hell mine would barely go 50 down hill.
Horizontal chute control was by muscle power in all of our trucks.
BTW the whole 9 yards is what I always thought when I was inside that drum air chiseling
the concrete stuck to those fins.
Yeah, bababy !!
Okay, I am sure upon careful reading of the posts that have landed here since I last viewed, that 70mph is a bit of a stretch. My apologies to those here who have handled the hefty leviathans around tight corners and whatnot.
It was a number plucked from thin air, I shoulda been more conservative in my guesstimation. Sorry about that…