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Concrete mixer - Capacity?

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mud

03-26-2006 16:32:33

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Just how much concrete is mixed up in a one bag mixer? I'm looking at a 3 pt. mixer that has a large capacity drum. After you mix a bag of Portland, gravel, and or sand, how much crete do you get?

Thanks -

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Slowpoke

03-28-2006 23:08:40

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Re: Concrete mixer - Capacity? in reply to mud, 03-26-2006 16:32:33

Here's the way I understand it:
If it's a one bag mixer, then you should be able to put in 1 94lb bag of cement (which is 1 cubic foot as Bus Driver said), 3 cubic feet of gravel and 2 cubic feet of sand. Now the mixer is loaded with a dry 6 cubic feet total. 27 cu' = 1 yard. Theoreticaly you would load the mixer 4� times to get a yard. But since the wet sand and cement are dispersed between the gravel pieces, 4� loads would be less than a yard, so you would need full 5 loads. Which means you would use 5 bags of cement for a 5 bag mix. To get a stronger 6 bag mix you would use 1+1/5 bag of cement on each of 5 full loads. Depending on how much you need, and want no variation between loads, make a plywood box 12x12x12, with open top. For each load add 3 boxes of gravel and 2 boxes of sand to the drum with the appropriate amount of cement. Add water sparingly and mix. Don't use a hose. Fill up two or three gallon jugs and pour a little from them. Check mix before adding more water. Do not over water. On a small mixer, an extra pint could be too much. The mix should be plastic and not runny.
If I'm wrong in my thinking, somebody let me know!

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03-26-2006 23:05:24

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Re: Concrete mixer - Capacity? in reply to mud, 03-26-2006 16:32:33

Hi,Mud. A bag of cement has ten heaping shovels in it.I made a three sided box that I dump the bags of cement in,then shovel into the mixer.Agood mix for a footing is 5 gravel one cement and you will use about four bags per yard with this mix.For the foundation I mix a little stronger,maybe four gravel one cement.With this mix you will need about 5 bags per yard of concrete. Get extra gravel as it's volume shrinks by one third when mixed with cement.

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mud

03-27-2006 04:25:23

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Re: Concrete mixer - Capacity? in reply to 02, 03-26-2006 23:05:24

That's great. Thanks.

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Floyed

03-26-2006 19:17:02

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Re: Concrete mixer - Capacity? in reply to mud, 03-26-2006 16:32:33

A six bag mix in theory uses six bags of pure cement per yard of concrete.

A five bag mix uses five.

If you use the same amount of pure powder cement and adjust the sand and gravel to make the above mixes,

the five bag mix (with the same amount of cement as the six) will have more sand and gravel. So it makes more concrete with the same cement.

That's why some people order six sack mix. Meaning for the same amount of sand and gravel it would have more cement.

Tada!

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mud

03-26-2006 20:29:39

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Re: Concrete mixer - Capacity? in reply to Floyed, 03-26-2006 19:17:02

O.K., so is it reasonable to say a single bag mix is 1/5th. a cubic yard?

Just trying to figure it out.

mud

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BobInMN

03-26-2006 17:15:03

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Re: Concrete mixer - Capacity? in reply to mud, 03-26-2006 16:32:33

It Depends. Are you using a 5 bag mix or a 6 bag mix. A 5 bag mix will be 1/5 of a yard or 5.4 cubic feet. A 6 bag mix will be 1/6 of a yard or 4.5 cubic feet. This is what you get if you mix one bag at a time.

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mud

03-26-2006 17:40:41

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Re: Concrete mixer - Capacity? in reply to BobInMN, 03-26-2006 17:15:03

Are those mixes something like Sakcrete? If so, that isn't what I'm asking about. Site mix is what I'm refering to.

Anybody know how much is mixed in a one bag mix using raw material onsite? Thanks again...

mud

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ebbsspeed

03-26-2006 17:22:48

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Re: Concrete mixer - Capacity? in reply to BobInMN, 03-26-2006 17:15:03

I don't know anything about concrete mixer capacities, etc. But I'd like to know what a 5-bag mix and a 6-bag mix are, and an explanation of why a 5-bag mix would result in more concrete than a 6-bag mix.

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BobInMN

03-26-2006 17:45:50

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Re: Concrete mixer - Capacity? in reply to ebbsspeed, 03-26-2006 17:22:48

A yard of Concrete is 27 cubic feet. If you are going to use one bag (94 lbs) per mixer load you will use more sand and aggregate with a 5 bag mix. If you used a 5 bag mix design and mixed a total of 6 loads (6 bags) you would end up with 32.4 cubic feet of concrete.

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mud

03-26-2006 17:42:39

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Re: Concrete mixer - Capacity? in reply to ebbsspeed, 03-26-2006 17:22:48

Got me too! 60 lb. bags vs. 80 lb? dunno... LOL!

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Bus Driver

03-27-2006 04:32:32

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Re: Concrete mixer - Capacity? in reply to mud, 03-26-2006 17:42:39

The 94 pound bag of Portland cement is one cubic foot. Makes it easy to get the right proportions with the other ingredients.

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Floyed

03-26-2006 19:19:17

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Re: Concrete mixer - Capacity? in reply to mud, 03-26-2006 17:42:39

I always hit the wrong reply thing and it ends up in the wrong spot..... .....

A six bag mix in theory uses six bags of pure cement per yard of concrete.
A five bag mix uses five.

If you use the same amount of pure powder cement and adjust the sand and gravel to make the above mixes,

the five bag mix (with the same amount of cement as the six) will have more sand and gravel. So it makes more concrete with the same cement.

That's why some people order six sack mix. Meaning for the same amount of sand and gravel it would have more cement.

Tada!

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BobInMN

03-26-2006 17:49:12

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Re: Concrete mixer - Capacity? in reply to mud, 03-26-2006 17:42:39

OK. What do you want the concrete for? Do you want 3000 PSI or 4000 PSI concrete. I work in a soil and materials lab. We do a lot of different mix designs.

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mud

03-26-2006 19:56:15

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Re: Concrete mixer - Capacity? in reply to BobInMN, 03-26-2006 17:49:12

It's for footings for an addition. So, a single bag mix is somewhere near 1/5 a yard? Give or take?

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KEB

03-28-2006 14:46:55

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Re: Concrete mixer - Capacity? in reply to mud, 03-26-2006 19:56:15

I think you"re trying to work it backwards. The terms "5 bag mix" and "6 bag mix" define the ratio of portland cement to aggregate, i.e, the amount of portland cement per yard of concrete, not a specific volume of concrete.

For example, if you need 1/2 yard of concrete, and a "5 bag mix" was strong enough, you"d need 2-1/2 bags (2-1/2 cu ft) of portland cement plus enough aggregate (sand & gravel) to make your 1/2 yard of concrete. If you"re using a small mixer, it"s normally measured by shovel fulls, i.e, a mixer full of "5 bag mix" takes so many heaping shovels of portland cement, so many of sand, & so many of gravel.

According to the Quickrete website, a typical mix is 3 parts gravel, 2 parts sand, and 1 part portland cement, measured by volume.

Hope this makes things a little clearer than mud...

Keith

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