speedy
Full Member
"Why hump it? Pump it!"
Posts: 33
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Post by speedy on Oct 25, 2009 2:20:46 GMT -5
After dosing a load with water, say to increase the slump by 2 inches (2 gallons per yard) how long do you let it mix to get a homogenous mix? Is the time any different from adding any other admix?
I'm a concrete pump owner/operator, I say it takes 5 minutes of high-speed mixing to get a consistent mix, depending on the condition of the fins. Otherwise, it's just the 'outside' of the mix that gets wet up, and the 'core' stays dry, and that's the last stuff out of the barrel. What do you drivers find?
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Post by wileycoyote on Oct 25, 2009 14:47:13 GMT -5
I would say at least 5 minutes. If its really gross stuff I'll try put the water in first before I start mixing, so it gets to the front.
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Post by booger on Oct 25, 2009 18:26:57 GMT -5
Ten to 15 revs after the water is shut off.
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Post by LEAD DOG on Oct 25, 2009 20:01:58 GMT -5
ACCORDING TO OUR QC DEPT. (I use the term loosely  ) 75 REVOLUTIONS or 5 MINUTES. |
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Post by BillyCement on Oct 25, 2009 20:57:25 GMT -5
ACCORDING TO OUR QC DEPT. (I use the term loosely ) 75 REVOLUTIONS or 5 MINUTES. |
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Post by LEAD DOG on Oct 26, 2009 20:15:40 GMT -5
ACCORDING TO OUR QC DEPT. (I use the term loosely ) 75 REVOLUTIONS or 5 MINUTES. |
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Post by Mort on Oct 30, 2009 12:11:05 GMT -5
Usually 1 minute for water, five for any admixtures.
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gant
Junior Member
Posts: 12
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Post by gant on Oct 30, 2009 18:25:57 GMT -5
till I feel it is ready lol
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Post by concretejoe on Nov 5, 2009 0:17:27 GMT -5
ASTM says 40 revolutions for job site addition of water I believe. 75 revolutions after it is loaded onto the truck. Normally I'll just let it mix until I see the contractor getting antsy.
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munkey
Junior Member
Posts: 24
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Post by munkey on Nov 5, 2009 2:25:41 GMT -5
about 2mins..
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Post by Mort on Nov 7, 2009 13:22:56 GMT -5
ASTM C94 12.7 states that 30 revolutions at mixing speed to ensure that a homogeneous mixture is attained. So, with a max speed of 18rpm, that would mean a little under 2 minutes. And no, I wouldn't know that unless I had the manual right in front of me  |
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Post by savagesam on Dec 30, 2009 15:59:55 GMT -5
Imho 5 mins is too much in the summer or hot temps. Also 2 G. per C.Y. is fine for summer or 8 sack, but too much in winter. If it doesn't do what you think it should ask the driver to climb up and spray it to the front of the load.
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Post by Mort on Dec 30, 2009 17:08:54 GMT -5
Well, the water *should* only be added up to the point where it doesn't exceed the water/cement ratio of the mix design. And I've never in my life seen a contractor go over that :-P
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Post by oldsmith on Dec 31, 2009 0:19:21 GMT -5
Well, the water *should* only be added up to the point where it doesn't exceed the water/cement ratio of the mix design. And I've never in my life seen a contractor go over that :-P You should come out here and pour for the Amish. When I go to any Amish I leave the plant with it as wet as I can without it coming out the back then when you get there they have you put ALL of your water in the load leaving just enough to rinse in. We have trucks with 400 gal water tanks down to trucks with 200 gal tanks and its the same no mater what you got. But if they put there signature on the waiver its good by me. They just let it self level and thats all they do. |
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Post by BillyCement on Dec 31, 2009 9:41:40 GMT -5
Do the Amish tip?
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Post by oldsmith on Dec 31, 2009 13:33:30 GMT -5
No they are tight as hell. Yet when they pay you out comes a wad of hundreds. A big wad of hundreds!!! |
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Post by truck520 on Jan 4, 2010 7:07:47 GMT -5
well if ya own the pump and ya been doing it long enough ya should know then. dear mister pump man. ( wait till i'm done pumping down i'll need some of your hot water ) lol one min is fine
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Post by Mort on Jan 4, 2010 17:00:07 GMT -5
Dude, how much would it rule to have a 400 gallon water tank? We've got some 90 gallon tanks on our trucks, but most are between 125-150.
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Post by colemen18 on Feb 5, 2010 11:28:22 GMT -5
Amish are my favorite customers! They never complain when i lay it out the way i want to! The little kids freak when you give them candy too!
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Post by Mort on Feb 11, 2010 17:06:07 GMT -5
I bet it takes a long time to get the load there being pulled by a team of horses.
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Post by LEAD DOG on Feb 12, 2010 19:28:32 GMT -5
YOU HIT ANYONE HARD ENOUGH, THEY'LL TIP RIGHT OVER! 
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) 75 REVOLUTIONS or 5 MINUTES.
