In this week's tip we want to show you how to accurately figure concrete for a slab on metal deck pour. There is a formula and we want to show you what the formula is and how to set up an excel spreadsheet so you can quickly and accurately figure concrete for a slab on metal deck pour.
Step One: Enter description into A Column rows 1-10
Step Two: Understand the descriptions
So in column A of the spreadsheet the slab length (1) and slab width (2) are the overall dimensions of the slab you are going to place. #3-7 are shown above to help you figure out what dimensions you need. #8 is if you are pouring your slab to elevation (there is a link below to a free training course that guides explains the difference between pouring to thickness and pouring to elevation, it's free so check it out). #10 is what you are trying to calculate the total cubic yards for the slab placement, this will be shown in the video's below.
Step Three: Will show you two ways to enter the formula in excel.
So once you have completed step one above and created your spreadsheet and entered the descriptions in column A rows 1-10. Also, you understand the dimensions needed as shown in step two above, then go to step three option one then option two to enter the formula needed to calculate slab on metal deck,
Option One: Will show you the formula by entering text.
Option Two: Will show you the formula by clicking the cells to enter into the formula.
We hope you have now created a spreadsheet to help you figure concrete for slab on metal deck, and as talked about in the videos above the link for a free course on what you need to know before you place slab on metal deck is below, so check it out today!
Check out Construct-Ed newest Free Course on what you need to know before placing your next metal deck.
Getting ready to move up into a new role as a foreman and are wondering how to order concrete?
You need a couple of things before you call your concrete supplier and schedule concrete.
1) Your job name/number and location
2) The scheduled pour date and time
3) Mix design number/ bag mix and admixtures
4) Cubic Yards Needed
5) Spacing on trucks
So how do you figure concrete- In the US it's by cubic yards, you times the width by the height by the depth then divide by 27. So a footing that is 16' long x16' wide x 4' deep then divide by 27
16x16x4= so there is 1024 cubic feet and there is 27 cubic feet in one yard so 1024/27=37.92 yards
So would you order exactly 37 yards? If you order the exact you will come up short so rather than getting into a lot of detail about deflection, spillage, weight etc., you have what we call a waste factor. Again we can get into a lot of detail here about uneven sub-grade, composite decking deflection, pump loss, gravel sub grade etc... but if you figure a 5% waste factor on most applications you will be safe. So if you need 37.92 yards times that by 5% gives you 1.85 yards, so 1.85+ 37.92=39.77 yards so you would want to order 40 yards.
When picking your date and time just be aware of how much your pouring- if your trying to pour 500 yards in footing and the job is on a busy road than you would want to pour at off traffic hours for better service. Or what type of mix your pouring if you have a hot mix that has some quick setting admixtures or like a corrosion inhibitor (DCI,CNI) then you don't want to try pouring in the afternoon of a hot sunny day. So, know and understand what’s in your concrete and the environment around and on the job when scheduling concrete pour.
Finally spacing on the trucks, some factors determining the spacing on the trucks would be
first: how many yards an hour can be placed- if you have a pump and are trying to do a large pour-what’s that pump good for, if your using wheelbarrows how many do you have, how long does it take to get from the load section to the pour are and back.
Second: type of pour- there’s a big difference between how many yards an hour you can pour a 4" slab on grade and an 8" slab on grade- take a 30' x 30' area:
* a 4" it takes 30 yards to pour out- so three concrete trucks.
* a 8" it takes 44 yards so 4-1/2 concrete trucks.
The area is the same, so you can dump 4.5 trucks on an 8" slab quicker than you can a 4" slab.
so your spacing might be 7 minutes for an 8" slab and 12 minutes for a 4" slab.
If you’re a new foreman the best advice if it's available for you would be to talk to your finish crew, carpenter crew, concrete supplier and pump operator to come up with a good pour out plan.
And if you don't already have a pre-pour checklist click here and use these free pour cards, not only do they help you think through your pour planning it helps you develop a proper pour process.
Along with ordering concrete you need the finish product check out this free course by Construct-Ed https://www.construct-ed.com/concrete-vibration/, it's a free course along with a certification to add to your LinkedIn profile so check it out today!
In this weeks tip we will be marking up and exporting a slab plan with Bluebeam Revu. This is helpful in planning slab placement on your job. You can figure the sf, perimeter, CY and color code it all, then send to your finish crew so they can plan as well.
I've had request on how to add pour cards to a phone homescreen and to edit the forms once submitted. So today we walk through how to bookmark, edit and submit the pour cards. You can also click this link to use your free pour cards now
Here are a couple tips to help you with your next stair pan placement:
Thanks to Bo and Mitch for the video below talking about screeding pan stairs.
Construction How To's