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Concrete mixing

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Warren

10-16-2001 12:52:41

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I am set to mix and pour a couple of sidewalk slabs with my 3 point cement mixer. The mixer is apparently a "1 bag mixer". Which seems to be self explanatory, but here's the question. How much portland cement do I mix for a yard of concrete? Is a "6 bag mix" a one yard quantity made with 6 bags of portland cement?
Also, the bag instructions suggest 1 part cement, 2 parts washed sand, and 3 parts of aggregate. Does this comprise a 6 bag mix or is it as suggested by the Menard's sales clerk a 7 1/2 bag mix?
What is a good recommended mix for general flat work like I am doing for a sidewalk? I plan to pour about 5".
I'm confused and would like to buy enough bags of cement for the job without having to keep too many over the winter.

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Matt Harrington

10-23-2001 06:28:10

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Re: Concrete mixing in reply to Warren, 10-16-2001 12:52:41

Sorry I didn't see this post earlier. Here where I live in Texas we can get the gravel and sand already mixed together. It is called a premix for about $15 a yard. You mix 5 shovels of that to one shovel of cement. Once you know how much water to use in each batch, it goes very smoothly.

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Bernie

10-21-2001 16:24:11

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Re: Concrete mixing in reply to Warren, 10-16-2001 12:52:41

My aggie college Farm Construction book emphasized that the amount of water in the mix determines the strength of the concrete. Five gallons to a 94# bag for water tanks,etc, 6 gallons for floors and 7 for heavy footings. Dump the H2O in first, then 1/2 the sand and gravel, the bag of cement next and then the rest of the sand and gravel. I use about half and half 1" crushed rock and washed sand.If the mix is too sloppy add more sand and cut back on the rock next load. HTH

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Paul

10-20-2001 12:25:01

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Re: Concrete mixing in reply to Warren, 10-16-2001 12:52:41

The 1/2/3 ratio that you mentioned has been used in small mixers for years. It produces a good workable mix. It's easy to proportion with an ordinary shovel too. Don't get too involved with fancy formulas unless you enjoy worrying yourself. One shovel of cement-two shovels of sand-three shovels of gravel. Figure out how many 1/2/3 batches will fit in your mixer comfortably on the first loading, and then the subsequent loadings will be simple - maybe 5/10/15 ratio will fit for instance. It also helps to measure how much water the first load requires to make a workable mix. Then the subsequent loads will mix faster since you won't be using the "trial and error" method on each load. Helps to keep from getting an occasional "too wet" load. You can add dry mix to the mixer to correct a wet load, but if the mixer is already full. . . The wife and kids can help load buckets with the correct amount of water and sand for each load. . . Good luck with your project!

By the way - you can call a ready mix truck and save money if you are pouring a larger area. I seldom use my small mixer any more. And then sometimes you can't get the truck where you want it and the little mixer saves the day.

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bob

10-21-2001 18:09:24

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Re: Re: Concrete mixing in reply to Paul, 10-20-2001 12:25:01

we just poured a small slab at my son,s and got one of those 1 yard carts and pulled it home behind pickup really handy getting spots and will stradle sidewalk. Only complaint i have is we didn,t like more rocks in last of load but owner said he should have told us to stirr a little with shovel in long run for small batch it was cheaper than ready mix truck with min load add ons.

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keith bryan

09-05-2004 11:26:42

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Re: Re: Re: Concrete mixing in reply to bob, 10-21-2001 18:09:24

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ErnieD

10-18-2001 17:42:17

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Re: Concrete mixing in reply to Warren, 10-16-2001 12:52:41

Tip of the day. Make sure engine air intake is not down wind of cement dust plume of charging the mixer. Paper air cleaners will not do a good job of filtering out the cement powder.

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bbott

10-16-2001 15:27:21

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Re: Concrete mixing in reply to Warren, 10-16-2001 12:52:41

Here's a snip from another web site on mixing concrete..

For estimating purposes, you can make about 1 cubic yard of concrete with five 94-pound bags of cement, 14 cubic feet of sand, and 21 cubic feet of gravel. (this is your 5 bag mix)

(It takes about forty 80-pound bags of prepackaged materials to make 1 cubic yard of concrete.) Note that the volume of the combined ingredients is about one-third less than the sum of the volumes of the individual ingredients.

A site with a nice concise outline form of concrete basics is...

Link

if you go to www.google.com and search on 'concrete' you'll get lots more links.

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