project prismoid demonstration

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Pocket Form Isolator

“Project Prismoid” Demonstrationof Potential Savings via

Concrete Waste Prevention

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Pocket Form Isolator…

• Seems to “Cost too much” to many people if they don’t understand how its cost can be offset with Concrete Waste Prevention.

• Stays where it is used to retain level soil, which is placed atop a concrete footing.

• May be placed prior to, or after steel column erection. Nothing needs to be cut in the field – only simple corner bolting.

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• Never needs to be removed, which saves labor, money, time and reputations.

• Enables a wide variety of finish options.

• Often enables a contractor to cast slabs and pocket infill concrete simultaneously.

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• Works very differently from wooden or any other temporary forming method.

• Is designed to meet the specific project needs with all factors considered.

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Temporary Formwork…

• Must always be removed, and therefore; causes slab casting and pocket infill to be always placed at separate times. This unfortunate circumstance always increases time needs and results in chipped slab edges due to formwork removal. Utility penetrations often become a nightmare!

• PFI offers a very simple, precise solution! We have an amazing array of configurations!

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• Enables “outside the box” conditions to be ideal for uniform thickness slab casting. Being able to maintain uniform slab thickness makes vapor barrier installation more practical and eliminates the waste of concrete being cast into unnecessary places. Concrete uses valuable natural resources and should be conserved.

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With temporary formwork…

• The contractor must thicken slab edges around isolation pockets to prevent loss of soil (as cave-ins). It is very rare for anyone to bring-in soil and compact this soil to a slope atop of the footing to form a “proper thickened edge”. The fact is that any thickened edge around an isolation pocket will always cause problems when the slab inevitably shrinks!

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Concrete Waste Prevention…

• Is the key to building the best possible pockets and casting a uniform thickness slab-on-grade.

• For the slab to maintain a uniform depth, there must not be areas where someone wastes money on thickened regions of concrete to enable a cheaper form to be utilized.

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Project Prismoid…• Utilizes hollow wooden

cubes to indicate one cubic yard of concrete. Since the scale for this model is 1.5” = 1’-0”, the cubes have an interior measurement of 4.5” in all three directions. This is the simplest shape, 1- yard in all 3- directions!

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Project Prismoid…

• Is a model where rice indicates waste concrete. Using this approach, rice only indicates waste, rather than necessary concrete for the slab.

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Project Prismoid…• This model is built

with a slope of 1:1, which for this model and at this scale = 20”of rise in 20” of run.

• Anchor bolts give one a feel for where this applies to their own comparative project.

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Project Prismoid…

• Just to help this best look realistic, we also made a scaled-down column to mount to the anchor bolts.

• This small column is not utilized in showing the concrete waste, it only provides spatial orientation.

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Project Prismoid…

• Is designed to only indicate concrete waste and it is for this reason that all wood pockets made for this demonstration are 1’-8” deep. This model indicates where the change occurs between necessary and waste concrete. Obviously, the footing and (4” thick) slab are necessary concrete, so the rice will only indicate the unnecessary concrete. Remember unnecessary concrete = waste concrete. This will show you where lots of money may be saved.

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A 24” square x 20” deep…• Was made from wood to be

used for the 24SQ24 comparison. The top 4” to be the floor slab.

• The top photo shows how it will be used for rice to be placed.

• The lower photo shows how it aligns with the red lines on the “footing”. The pocket’s text is also red.

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• The lower photo shows how it aligns with the green lines on the “footing”. The pocket’s text is also green.

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• The lower photo shows how it aligns with the blue lines on the “footing”. The pocket’s text is also blue.

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In an effort to only indicate…

• Waste concrete, the interior pocket is only built up to the height of the sides – 20” for this example of 24”square with 20”:20”slope of soil base.

• The 24” square wood pocket is held-down with the anchor bolts.

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To enhance the sales of PFI…

• We have a spreadsheet which shows how much concrete waste costs for any variety of isolation pocket configurations.

• We are always glad to work w/ customer’s “numbers” and show them how much money can be saved by eliminating their thickened slab edge. They are always shocked to learn the savings potential!

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The Concrete Waste Calculator…

• Uses the aforementioned variables to run calculations with a formula for the volume of the resultant prismoid with the pocket’s infill subtracted from said prismoid. The infill is necessary concrete – and cannot, therefore; be considered waste. There are figures provided “along the way” to verify accuracy.

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Customer’s numbers we need:• Cost of slab concrete per cubic yard.

• Pocket dimensions X, Y and Z.

• Ideal slab thickness (if uniform).

• Minimum edge width (bearing atop of footing).

• Quantity of similar pockets.

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The “numbers” we need are:

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The Concrete Waste Calculator…

• May easily be tailored to any condition for a square column isolation pocket.

• Will be easily used to “prove” certain examples that we have models made for.

• Uses formulas that are 100% accurate. The models simply indicate these volumes in a visual manner – which is often more easily understood.

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Since the model’s footing exposure…

• Is 6’-0” (72”) square, the below listed examples have the following minimum edge distances (E.D.):

• 24SQ24 example, E.D. = 24”• 28SQ24 example, E.D. = 22”• 36SQ24 example, E.D. = 18”

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Project Prismoid 24SQ24 results…

• On the left is a photo of the model utilizing the 24”square wooden pocket. Around the pocket is rice, which is representing unnecessary concrete w/ PFI.

• On the right is a photo showing the removed rice placed into measuring cubes. Our spreadsheet proved that this example would require 3.44 cubic yards of slab concrete.

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Concrete Waste Prevention…• People often focus on the cost of the form and

thereby consider PFI to be more expensive than their temporary form, but these same people fail to understand that in order to use a removable form, they must waste a huge amount of money to provide unnecessary concrete.

• PFI permanently retains the soil – placed atop of the footing – enabling a uniform thickness slab to be cast. This saves lots of money and gives a contractor perfect pockets for less cost than has been spent in the past.

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One could accurately say that his pockets are “free”…

• When the mountain of costs using removable pockets is honestly and accurately considered!

• Also, his slab’s edges are clean and undisturbed because there has been no form removal.

• Don’t let this problem cause you to lose profits while building sloppy, wasteful, time-consuming junk pockets!

• Step-up to the plate and do things the modern way!

project prismoid demonstration

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