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Post by Driver on May 29, 2006 13:07:33 GMT -5
You guys down there in Dundee have some info posted on Lift axle pressures and Slump readings all according to how much is loaded on the truck..
I was going to steal em but I didn't (thats the kinda guy I am ;D)
Any chance someone could post em or E-mail me copy's ,,,they where useful at least to me..something to have as general knowledge
& THANK YOU
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speedy
Full Member
"Why hump it? Pump it!"
Posts: 33
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Post by speedy on May 29, 2006 19:20:33 GMT -5
Pardon my ignorance, but how can the pressure on a lift axle have any relationship to the slump of the mix? I always thought that even the hydraulic pressure required to turn the drum at idle was dicey at best, even with an experienced eye? I work with one driver I would call a pro. He VERY seldom has to temper his load. While others, NEVER bring the right slump. One fella in particular, he'll try discharging it even when it's like plaster, more going up the funnel than down the chute.  I'll ask him to wet it up....(which he does, but usually not enough the first time), and he won't scrape the chute down, and the re-tempered stuff won't push the first mud down, and it's spilling over the edges of the chute. I'm sure you all have never worked with individuals like this, though. ;D |
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Post by Driver on May 29, 2006 20:40:18 GMT -5
It doesn't Speedy,my fault for wording topic that way..
These are 2 separate lil sheets (inter company) that are posted just as a guide line.
Example: 6 yrds on 4 axle truck,,the company wants ya to run X amount of air pressure in each axle,,and so on right down the line..
Same goes for slump meter,,,, total separate memo
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speedy
Full Member
"Why hump it? Pump it!"
Posts: 33
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Post by speedy on May 29, 2006 22:36:51 GMT -5
OK, my Dumb. I get it now. lift axles are a foreign concept to me, not allowed here.
Are the drive axles walking beam or rubber block, as oppose to spring or air-ride?
UGHH!! Gives me a headache just thinking about it. Gotta keep on top of it or else big $$ fines?
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Post by Driver on May 30, 2006 17:47:40 GMT -5
We have both air ride & Hendrickson susp----> Walking beams
No springs on the drives..
yep Last thing I want to do is walk in office with over load just because I forget to set air axles...I always play with pressure a bit to account for the increasing CRUMBLING Roads we have here,
& trying to get a better ride
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Post by batchmaster on Jun 1, 2006 7:13:05 GMT -5
i'll see if i can scrape up the tag axle pressure memo we put out, and see about posting a slump gauge "guide" when i get more time this afternoon for ya.
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Post by batchmaster on Jun 1, 2006 8:43:27 GMT -5
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Post by batchmaster on Jun 1, 2006 8:45:46 GMT -5
that didn't post right, the first set of numbers is the desired slump, then the next number you have drum wide open engine idling, then last drum wide open engine @ 2000 rpm. if that makes any sense.
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Post by batchmaster on Jun 1, 2006 9:18:08 GMT -5
Tag Axle Pressures
Here is a retyped version of the tag axle memo we put out in 2004. Anyone that has any input on this memo please post.
For 1200 series tires the tag axle pressure needs to run from 60-70 pounds. Fully loaded the recommended pressure is 90 pounds in the front axle and 70 pounds in the rear axle for five axle trucks, backed off in 10 pound increments per yard for less than a full load. For 5 axle trucks and the spread 6 axle trucks, typically an 11 cyd legal mixer, anything 2 cyds or less the tags do not need to be run in the down position, with 3 yards on the rear tag needs to be run down, and anything more than 4 yards both tags down for 5 axles, 2 tags down for the spread six. For the short six axle trucks, with any amount of concrete left on, you should run the rear tag down, more than 3 yards on, the rear tag and your second tag, for 5 yards or more all tags down. 6 axle trucks need all tags @ 110 psi for 10 yards and backed off 10 pounds per yard for less than full loads.
For 1000 series tag tires, the recommended pressure is from 70-90 pounds.
Legal Axle Weights for 5 axle trucks(Truck Empty Weighs approx. 32,500 lbs.)
Front Steer Front Tag Front Drive Rear Drive Rear Tag
18,000 lbs 13,000 lbs 13,000 lbs 13,000 lbs 13,000 lbs
Legal Axle Weights for Short Six Axle(Truck Empty Weighs approx. 34,500 lbs.)
Front Steer 1st Tag 2nd Tag Front Drive Rear Drive Rear Tag
13,000 lbs 13,000lbs 13000lbs 13,000lbs 13,000lbs 13,000lbs
Legal Axle Weights for Spread 6 axle (Truck Empty Weighs approx. 35,500, typically an eleven yard legal mixer)
Front Steer 1st Tag 2nd Tag Front Drive Rear Drive Rear Tag
18,000 lbs 13,000lbs 13,000lbs 13,000lbs 13,000lbs 13,000lbs
For Example: 3 cyds of 5 sack, limestone mix weighs approximately 12,141 lbs. The five axles and spread six axle trucks can carry 44,000 lbs. before putting any tags down, this includes the weight of the truck, so 11,500 pounds of material for 5 axles and 8,500 pounds of material for a spread 6 axle. The short six axles can carry 39,000 lbs before putting any tags down, this includes the weight of the truck, so 4,500 lbs. of material. So in this example every one of these trucks would need to have a tag down to be legal.
This is not gospel...but this is what our company runs by. Any input to this would be great. Hopefully everyone knows what I mean by short six and spread six axle truck, it has to do with the span between the front steer and first tag axle. Your Welcome Driver!
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Post by batchmaster on Jun 6, 2006 15:43:07 GMT -5
hope that this has been helpful, no new posts to this thread leaves me wondering, hmmm...waste of time.
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Post by Driver on Jun 7, 2006 6:40:13 GMT -5
Thanks Bmaster,,,,Not a waste of of time there Bro
Just havnt been near internet since last weekend
Will contuine later,, gotta punch in here soon
Thanks again
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Post by batchmaster on Jun 8, 2006 13:26:34 GMT -5
alright, as long as i know that all of that typing was not for nothing! hopefully it is useful information to somebody.
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Post by batchmaster on Jun 12, 2006 14:58:45 GMT -5
you also have to remember that load size, type of aggregate, and different admixture use may affect how your slump meter reads, that is why i try to stress to my guys to get a visual, and if you see someone taking a slump test, ask them what they got and make a mental note where it was reading when it was tested, see how close the gauge is. also remember that "dry batched" loads also read wet...hence the visual inspection.
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Post by Driver on Jun 14, 2006 19:50:59 GMT -5
Bet I go more on sound.. Using the slump meter and sound is what may make me look at it..I look after backing out and washing down..unless i think load is wet I more or less looking at load to see if the batchman forgot to add anything (stone sand powder etc etc) ;D ;D ;D anything out of ordinary Or how bad he just PLASTERED inside of the barrel  |
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Post by batchmaster on Jun 27, 2006 8:04:43 GMT -5
everything on this end is computer controlled, most of our screwups come from the loader operator contaminating bins so...but yes, you can hear a dry load crunching away. the only thing i might forget is maybe chloride or something...everything else is controlled by computer except i can adjust the water.
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Post by nascarfan67 on Jun 28, 2006 21:06:07 GMT -5
after doing this for awhile, i can usually tell by the sound in the drum what kind of slump i have, but ya gotta take a look before leaving the yard, sometimes sounds can be deceiving, especially if your hauling pea pebble, which allmost allways sounds wet, or shock crete which sounds wet, but is very dry, all i know is that if i leave the yard with a wet load, its on me, so i allways look.
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Post by Driver on Jun 29, 2006 22:58:22 GMT -5
Hey thats true,,,,,,Wet load is allways blamed on driver Now what about a dry load?  ? Me running out of water on a 6 yard load,,,Just what happened here,,, ;D Just maybe no water in the bottom of load???  Whats up with those loads ;D ;D Not sure what shock crete is??? Will rummage thru bosses mix designs tho to look it up,,,,,,,Have hauled no slump mud before but nothing called shock crete?? am at a loss here as to what that is,,,(Am thinking someone sold OLD mud? ?? ;D ;D) |
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Post by batchmaster on Jul 7, 2006 7:30:47 GMT -5
shot Crete, for pools and stuff, put through a pump and then blown out the other end through a gun...stacked up for pool walls, we have a job going right now that is using shot Crete at a miniature golf course. as far as the dry loads, probably not enough water before the load, and sometimes on a monday with material sitting in the plant over the weekend, the material is dryer and sucks the water. that's the only thing i can think of for that.
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Post by Driver on Jul 10, 2006 17:35:16 GMT -5
Shot Crete I have been involed with for Built-in pools,,preety kewl process.....it was the shock crete that threw me |
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Post by batchmaster on Jul 13, 2006 7:22:52 GMT -5
yep, same guy pronounces flyash as flash so...would throw most off as well.
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Post by Yard Bird on Mar 16, 2009 8:16:21 GMT -5
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Post by Mort on Mar 16, 2009 11:26:43 GMT -5
I thought shotcrete and gunnite were the same thing.
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Post by Mixer Driver 69 on Mar 16, 2009 14:40:04 GMT -5
I've done shot crete for the walls on freeway underpasses. Very dry, and, yea, I was there forever.
Anyone poured into a curb machine? Same thing, dry as eff, and the inspectors are very picky. More of our guys have been rejected on those jobs than on any other.
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Post by Mort on Mar 16, 2009 19:38:24 GMT -5
I don't believe I've ever been to an inspected curb job. Slip forms, yes, but I can understand why. It would suck if someone were to break through and go down the wrong side of I-5.
I rarely drive conventional anymore, though, so I get out of curb machines most of the time.
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Post by concretejoe on Mar 29, 2009 23:31:23 GMT -5
With gunnite the water is added at the end of the hose. The truck delivers the sand and cement mixture. That gets poured into a hopper which utilizes air to blow the mixture out of a hose. There is a water nozzle at the end that mists the mixture as it leaves the hose. The result is a dry, sticky mixture that is blown into shapes. It's used for pools, tunnels, erosion control, monolithic dome houses and many more things. Yardbird is right. Take a book and some earplugs.
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Post by Mort on Mar 30, 2009 15:00:28 GMT -5
So, with gunnite the water is added later, shotcrete it is in the load? Am I close?
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Post by Mixer Driver 69 on Mar 30, 2009 18:51:11 GMT -5
Yea, with shot crete, there's water in it, but it's very dry, a 2" slump. There's a nozzle at the end of the hose and an air line is attached to it, blowing the stuff onto walls or into pools. I did a koi pond today. 6 yards.
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Post by concretejoe on Mar 30, 2009 21:00:13 GMT -5
You're correct Mort, and talk about trashing your truck. It's the dry pack from hell.
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Post by Mort on Mar 30, 2009 21:02:58 GMT -5
Cool, I learned my one new thing today.
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Post by Peterbilt on Apr 22, 2009 22:29:15 GMT -5
Have any of you guys ever hauled CTPB its basically just 1 inch rock and powder they use it for the approaches before a bridge deck it covers drainage pipes its so loud and takes about 35 minutes in full discharge to get the load off we call it pop corn because of the noise it makes in the drum
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>:(Pressure w/ drum 
;Dwide open 
:-[wide open
:PEngine @ 2000 RPM
