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Dec 27, 2009, 5:54pm

MIXERDRIVER.COM/FORUM :: General :: General Board :: Mixing time

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Topic: Mixing time (Read 189 times)

speedy
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Mixing time
« Thread Started on Oct 25, 2009, 2:20am »

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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wileycoyote
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Re: Mixing time
« Reply #1 on Oct 25, 2009, 2:47pm »

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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booger
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Re: Mixing time
« Reply #2 on Oct 25, 2009, 6:26pm »

Ten to 15 revs after the water is shut off.

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LEAD DOG
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Re: Mixing time
« Reply #3 on Oct 25, 2009, 8:01pm »

ACCORDING TO OUR QC DEPT. (I use the term loosely ::)

) 75 REVOLUTIONS or 5 MINUTES.

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BillyCement
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Re: Mixing time
« Reply #4 on Oct 25, 2009, 8:57pm »

Oct 25, 2009, 8:01pm, LEAD DOG wrote:

ACCORDING TO OUR QC DEPT. (I use the term loosely ::)

) 75 REVOLUTIONS or 5 MINUTES.

75 revolutions. Hmmmm....that sounds like a typical year in South America.

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LEAD DOG
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Re: Mixing time
« Reply #5 on Oct 26, 2009, 8:15pm »

Oct 25, 2009, 8:57pm, BillyCement wrote:

Oct 25, 2009, 8:01pm, LEAD DOG wrote:

ACCORDING TO OUR QC DEPT. (I use the term loosely ::)

) 75 REVOLUTIONS or 5 MINUTES.

75 revolutions. Hmmmm....that sounds like a typical year in South America.

BILLY! YOU MADE A FUNNY! AND A GOOD ONE AT THAT! BRAVO!!!

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Mort
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Re: Mixing time
« Reply #6 on Oct 30, 2009, 12:11pm »

Usually 1 minute for water, five for any admixtures.

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gant
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Re: Mixing time
« Reply #7 on Oct 30, 2009, 6:25pm »

till I feel it is ready lol

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concretejoe
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Re: Mixing time
« Reply #8 on Nov 5, 2009, 12:17am »

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
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Re: Mixing time
« Reply #9 on Nov 5, 2009, 2:25am »

about 2mins..

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Mort
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Re: Mixing time
« Reply #10 on Nov 7, 2009, 1:22pm »

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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