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Concrete

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JDTECH

01-03-2003 23:16:34

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Hey, guys, can anyone please tell me how many cubic feet in a yard of concrete and how it is figured? Also where can I find a book or guide on weights, measurments and equivilents? Thanks.

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Steve B

01-05-2003 16:52:14

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Re: concrete in reply to JDTECH, 01-03-2003 23:16:34

Try WWW.Graniterock.com

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willyz

01-05-2003 05:35:07

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Re: concrete in reply to JDTECH, 01-03-2003 23:16:34

Easy amswer: a yard is 3ft. so a cubic yard is 3ft X 3ft X 3ft + 27 cubic ft.

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Wayne

01-04-2003 21:23:30

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Re: concrete in reply to JDTECH, 01-03-2003 23:16:34

You asked about a reference book, and the best one I have found for all around stuff is simply called the pocket reference, by Thomas J. Glover, or at least that's what's on the cover. It's published by Sequoia Publishing Inc out of Littleton Colorado. Their number is 303-972-4167. I imagine they could tell you where to pick up one. I picked my copy up in a local computer store, one of those things that they just set up by the register that has their name embosed on the cover but I've seen them other places also. It has a little bit of everything. The general index names Air and gases, automotive, carpentry, cemestry, computers, electrical and electronics, hardware, mine and mill aggregrates, money, plumbing/piping, rope and cable, steel and metals, tools, water, weights and properties of materials, welding, conversion tables, etc etc etc. Each of these catagorys is then broken then down into several different catagories. The book I have is pocket sized like the name implies, and is about 3x5 and maybe 3/4 inch thick, and every one I have seen has a black cover with gold embossing. I've found if it's not in this, it's probably too technical for us "average" guys to be messing with..LOL Looks like everybody else had got your concrete problem worked out, but maybe if you can get you a copy of this book it'll be a big help in the future. Wayne

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Joe (Wa)

01-05-2003 19:14:40

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Re: Re: concrete in reply to Wayne, 01-04-2003 21:23:30

Glover pocket ref is avail @ Harbor Freight and many other similar stores. A couple of bucks well spent.

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01-04-2003 21:06:06

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Re: concrete in reply to JDTECH, 01-03-2003 23:16:34

Concrete weighs 4000 lbs per yard. Aggregate normaly weighs 2800-3200 lbs per cubic yard, depending on type. There is 27 cubic feet per cubic yard. A simple way to figure coverage is to divide the inch thickness of your slab into 12 and then multiply that number times 27. Example, 4" divided into 12=3. 3x27=81. 6 divided into 12 =2 2x27=54.

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JDTECH

01-04-2003 16:47:30

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Re: concrete in reply to JDTECH, 01-03-2003 23:16:34

Wow, I didn't mean to stir up a debate! All of your information and advise is very much appreciated. Thanks.

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Mac

01-04-2003 12:28:15

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Re: concrete in reply to JDTECH, 01-03-2003 23:16:34

Never figured much on how it is calculated. I have an old slide rule type calculator I have used for years. Several calculators on the web. I usually get plenty and have a place ready to use any extra left over. Better a little to much than not enough. I dont think there are ever 2 batches alike anyhow.

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jls

01-04-2003 17:47:20

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Re: Re: concrete in reply to Mac, 01-04-2003 12:28:15

For fun we stand at the job site and figure concrete and then compare answers! Then we call the batch plant and have THEM figure it. Round up and nail several 2x4 frames 4'square to dump the extra in, makes handy steps and places to set equipment. The important part is to know which companys consistantly deliver short!

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buck

01-04-2003 08:50:24

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Re: concrete in reply to JDTECH, 01-03-2003 23:16:34

3'x3'x3'=27 cu.ft.=1cu.yd. and weighs 4000lbs. per cu.yd. or 150lbs.per cu.ft. In general terms and applicable to most construction the weight applies to concrete, stone, gravel sand. and earth. I try to remember this because most of these materials are sold by weight or volumn and in most cases you are trying to place them by volumn.

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Hancock Concrete Finishing

01-04-2003 08:05:33

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Re: concrete in reply to JDTECH, 01-03-2003 23:16:34

There is 80 cubic feet in a yard of concrete and if you pour a building on a 4 inch floor then times your length times your width and divide it by 80 and youll know how much concrete to order from the ready mix plant. Say a pad is 20 ft long and 40 ft wide then go 20x40=800square feet and divide by 80= 10yards of concrete and if it is a 5 inch floor then divide by 70 and if it is a 6 inch floor divide by 60 and so on

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Stan

01-04-2003 13:08:06

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Re: Re: concrete in reply to Hancock Concrete Finishing, 01-04-2003 08:05:33

Hancocks talking SQUARE feet you get per yard at given thickness.

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JMS/MN

01-04-2003 13:07:39

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Re: Re: concrete in reply to Hancock Concrete Finishing, 01-04-2003 08:05:33

What you really mean is you can cover 80 square feet of a slab with one cubic yard of concrete if the slab is four inches thick. I never figured out the 70 and 60 divisor- I always figure at the four inch depth and add 25 % for each extra inch of thickness. Looks like we all get the same result, just travel a different path.

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Rod (NH)

01-04-2003 13:21:13

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Re: Re: Re: concrete in reply to JMS/MN, 01-04-2003 13:07:39

Must be that danged "new math". If you use the 60 divisor as stated, you wind up 1.5 cubic yards SHORT of the required amount :o).

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Are you sure 'bout that?

01-04-2003 13:00:49

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Re: Re: concrete in reply to Hancock Concrete Finishing, 01-04-2003 08:05:33

A cubic yard should be 3'x3'x3'. That works out to 27 cubic ft.

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Whoa, horsie

01-04-2003 12:06:39

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Re: Re: concrete in reply to Hancock Concrete Finishing, 01-04-2003 08:05:33

Don't mean to start a fight, but Hancock's figures are incorrect. Concrete is typically measured in "yards", which is shorthand for "cubic yards". As Russ stated, there are 27 cubic feet (1 foot x 1 foot x 1 foot) in a cubic yard (1 yard x 1 yard x 1 yard). 1 yard = 3 feet, so 1 cubic yard = 3'x3'x3' = 27 cubic feet. If you want conversion factors for different slab thicknesses, the best thing to do is convert your slab thickness to feet, then use the above formula. Example: 20 x 40 x 4" thick = 20 x 40 x 0.33 = 264 cu. ft. / 27 = 9.7 cubic yards. To do a 6-inch slab, it would be 20 x 40 x 0.5 = 400 cu. ft. / 27 = 14.8 cubic yards. Of course, round to the next highest yard--most plants won't deliver partial yards, and there's nothing worse than finding you're just a tad shy when the concrete's already poured!

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JDTECH

01-04-2003 16:42:40

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Re: Re: Re: concrete in reply to Whoa, horsie, 01-04-2003 12:06:39

Thanks for your time and input. My brother-in-law told me 1 yd of concrete covers 81 sq ft at 4" thick, but he couldn't remember the rest. I wasn't sure, but I had it the back of my head that a yd was 3'x3'x3'. I just needed to know for sure. I have a 28'x48' pole building that has an unlevel dirt floor. I am trying to figure how much it will cost me to pour a floor, footing and 4' retaining wall. Thanks for your help.

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T_Bone

01-04-2003 18:44:26

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Re: Re: Re: Re: concrete in reply to JDTECH, 01-04-2003 16:42:40

Hi JDTECH,

If you had you uneven floor varying from 4" to 5" it's going to cost you some crete money.

A 28'X48'x4" slab = 28x48=1344sq/ft X 144 (ci in a sq/ft)= 193,536ci X 4"(slab thickness)= 774,144ci/1728 (ci in a cft)= 448cft/27 (cft in a cyd)=16.6yds of crete

A 28'X48'X 5" slab=20.74yds

So if your slab was 1/2" average too deep then it would cost you and extra $280 plus tax for crete at $70yd. Now you can see why it's very important to fine grade the bed before you pour.

T_Bone

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T_Bone

01-05-2003 22:05:53

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Re: Re: Re: Re: Re: concrete in reply to T_Bone, 01-04-2003 18:44:26

Correction;

It'll cost $140 more in crete.

T_Bone

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TimV

01-04-2003 07:23:36

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Re: concrete in reply to JDTECH, 01-03-2003 23:16:34

JDTech: Russ answered one question, and I'll tackle the other--there are plenty of books available that have conversion factors--Mark's Standard Handbook of Engineering is the granddaddy of them, but at $100+ it's kind of ex$pen$ive. There are also plenty of on-line converters available--refdesk.com and onlineconversion.com are two I've used, though there are tons of others. I wrote an Excel spreadsheet years ago for figuring concrete yields, and I still use it--it's pretty basic, but it works fine. When figuring yields, be SURE your units line up--measuring one dimension in feet and another in inches is a sure way to order the wrong amount of concrete!

onlineconversion

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JDTECH

01-04-2003 16:30:11

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Re: Re: concrete in reply to TimV, 01-04-2003 07:23:36

Thanks, Tim. Years ago I had a little booklet that had the majority of those conversions, but wouldn't you know it when I really wanted it I couldn't find it. Back in high school and college I probably could remember them right off the top of my head but time has a funny little way of stealing things from us. Thanks again.

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TimV

01-05-2003 00:30:09

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Re: Re: Re: concrete in reply to JDTECH, 01-04-2003 16:30:11

JDTech: No problem--the whole reason for this board's existence is for us to help each other out! I've got a nifty little program I downloaded from somewhere on my puter at work that I can send you if you're interested--drop me an e-mail and I can send it to you. It's got dozens of conversion factors and other useful stuff--very similar to the "pocket reference" Wayne mentioned (which I've seen before--it's very handy). Gotta confess--I also wrote the "whoa horsie" post--didn't want to start a fight, but also didn't want you to come up shy on your concrete--been there, done that! Also keep in mind that if you use 2x4's (or any other store-bought lumber) for your forms, they are typically 1/2" shy of nominal dimensions, which can throw your calculations off as well, though usually to the good (too much!) side.

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TimV

01-06-2003 09:44:07

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Re: Re: Re: Re: concrete in reply to TimV, 01-05-2003 00:30:09

JDTech: I found the download site for the conversion program I have. It's small (145k) but pretty handy.

Conversion utility

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Russ

01-04-2003 01:42:28

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Re: concrete in reply to JDTECH, 01-03-2003 23:16:34

There are 27 cubic feet in a cubic yard, 3'x3'x3'. If you want to figure how many square feet you can cover with a cubic yd, first you need to know the thickness, for example 6", which will be a square foot of coverage 6" deep which works out to 1/2 cubic foot, 12"x12"x6" so you will get 54ft� of coverage from 1yd�. Simply multiply the 27ft(�) x 2 to get coverage amounts. For a 4" slab you will get 81ft� coverage from a yard(�). Of course these are all ideal numbers and you will need a certain percentage extra depending on how flat and level you have made the base to place the slab on. As a rule, washed stone is much cheaper than concrete so you are better off using more stone and less `crete. If this is a slab for heavy equipment it`s a good idea to compact the stone and fill in low spots before you pour, this ensures that your slab is fully supported. Russ

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charlie

01-04-2003 07:29:12

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Re: Re: concrete in reply to Russ, 01-04-2003 01:42:28

length x width x depth / 27 = cubic yards.good luck

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Russ

01-04-2003 01:42:27

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Re: concrete in reply to JDTECH, 01-03-2003 23:16:34

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