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concrete void material
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Re: concrete void material By  peach!!

Posts: 0

6/1/2009 4:10:00 PM

I wouldn''t use a biogradable material unless the grade beam is short enough to support itself and imposed loads without additional support. Foam isn''t going to provide a lot of support (even though it will be there forever).


   

Re: concrete void material By  beach

Posts: 0

6/1/2009 4:58:00 PM

Aren''t grade beams usually designed to support from the ends? The void material is not relied upon to support the beam, it acts as a cushion as the soil expands and contracts. Good question about the type of material...doe the engineer call out the material?


   

Re: concrete void material By  rday

Posts: 0

6/1/2009 5:05:00 PM

I disagree peach.

The void material for the purpose in the OP needs to degrade. The presence of swelling soils requires a void space be created beneath the grade beam.

The grade beam is designed to function as a beam, the form void is not intended for long term support.


   

Re: concrete void material By  peach!!

Posts: 0

6/1/2009 5:23:00 PM

so............ why not use air as the void material? That''s what will be there in the long term.


   

Re: concrete void material By  beach

Posts: 0

6/1/2009 5:29:00 PM

probably because you need something to pour against?


   

Re: concrete void material By  peach!!

Posts: 0

6/1/2009 5:35:00 PM

beach..
Isn''t that called a form?

Pour the beam.. remove the form.. backfill..

foam is not much of a resisting material.


   

Re: concrete void material By  beach

Posts: 0

6/1/2009 5:36:00 PM

Kind of tough to remove a form from the bottom of a grade beam


   

Re: concrete void material By  peach!!

Posts: 0

6/1/2009 6:14:00 PM

Even if there is a "void"..

Isn''t a void the definition of void material..

foam.. cardboard.. neither will resist the forces of the concrete being placed against them.

Prove it to me..


   

Re: concrete void material By  beach

Posts: 0

6/1/2009 6:46:00 PM

The material is placed between the earth and the bottom of the soon to be placed concrete, that''s the way it''s done.

Prove it? OK...


   

Re: concrete void material By  beach

Posts: 0

6/1/2009 6:54:00 PM

http://www.beaverplastics.com/beavercurrent/frostcushion.html


   

Re: concrete void material By  beach

Posts: 0

6/1/2009 6:58:00 PM

Corrugated paper (cardboard):


************************************************************************************************************************
SECTION 03100 - CONCRETE FORMWORK (WALLVOID)
************************************************************************************************************************
This section includes corrugated paper void form materials to create a temporary support for the placement of structural concrete walls and grade beams spanning between supporting elements where expansive soils or other conditions are present below. WallVoid creates a void space beneath structural concrete walls and grade beams, allowing expansive soil to swell without damage to the structure.

Information contained herein is intended to be included as a supplement to Section 03100 - Concrete Formwork.

************************************************************************************************************************

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Corrugated paper void form materials to create a temporary support for the placement of structural concrete walls and grade beams over expansive soils.

1.2 SUBMITTALS

A. Submit product data and manufacturer?s installation instructions under provisions of Section 01300 for corrugated paper formwork and accessories.

************************************************************************************************************************

PART 2 PRODUCTS

Edit the following descriptive specifications to identify project requirements:

WallVoid products can be designed to offer an approximate response to moisture by specifying the interior components? makeup as follows:

1. Extra Fast ? Non-wax impregnated, plain kraft paper and a water-soluble adhesive
2. Fast ? Non-wax impregnated, plain kraft paper and a moisture-resistant adhesive
3. Moderate ? Plain kraft paper with a wax impregnated medium, but non-wax impregnated liners and a moisture-resistant adhesive
4. Slow ? Plain kraft paper with wax impregnated medium / liners and a moisture-resistant adhesive
5. Extra Slow ? Wet-strength paper with wax impregnated medium / liners and a moisture-resistant adhesive

The standard strengths of WallVoid are designed for any average working load ranging from approx. 800 p.s.f. ? 2,000 p.s.f. in increments of about 200 lbs. Custom strengths up to 7,000 p.s.f. are available upon request.

WallVoid is available in ready-to-use, factory-glued assembled form, as well as knockdown (K.D.) form for shipping and storage savings. The standard length of each piece is 60?. Pieces are easily crosscut with a handsaw to fit as required. Available void depths range from 1? to 18?. Pieces can be stacked in layers to achieve depths greater than 18?. Standard widths range from 4? to 36? and can be installed side by side to achieve greater widths.

Types Available:
1. WallVoid (rectangular with panel flange) ? used in between the panels of a wall forming system. The panels are placed on the flange to hold the void piece in place, thereby preventing it from floating up into the wall during concrete placement.
2. FormVoid (rectangular without flange) ? used underneath the panels of a wall forming system. It is designed to carry the load of the formwork as well as the concrete wall or grade beam. It is used primarily in intermittent footing applications.
3. TrenchVoid (rectangular without flange) ? used in the bottom of a trenched grade beam where the earth is used to form the beam. The width of the void form is the same as the trenched beam.
4. TrapVoid (trapezoidal shape with or without flange) ? used in either formed walls or trenched grade beam applications where a cast-in-place concrete retainer is required at the base.

Related Products:
1. SlabVoid ? used to create void space directly under structural concrete slabs.
2. ArcVoid ? used to properly create void space around the upper portion of drilled piers at the intersection with grade beams.
3. SureTops ? used to properly form and contain the upper portion of concrete piers.
4. SureRound PierVoid ? used to properly create void space adjacent to the upper portion of drilled piers at the intersection of the slab, under pier caps, or at a transition in pier diameter.
5. Column Wrap ? used to surround and isolate telepost columns from the slab.
6. Pipe Guard ? used to surround and isolate typical diameter pipes that are protruding from the slab.
7. Pipe Wrap ? used to surround and isolate all sizes of pipes protruding from the slab.
8. Angle Expansion Strip ? used to reduce damage caused by vertical movement around the slab perimeter adjacent to grade beams.
9. SureRetainer by Motzblock ? used to prevent the migration of backfill material into the voided area, while allowing compaction equipment to operate directly adjacent to wall or grade beam.
10. SureCover Board ? used to distribute working load, bridge small gaps, and protect void material from puncture and other damage during concrete placement.

************************************************************************************************************************
Where brackets are indicated [ ], a choice needs to be made by design engineer. Remove options not needed for a particular project.
************************************************************************************************************************

2.1 PREFABRICATED VOID FORMS

A. Wall Void Forms:
1. Function: used to create void space directly under walls or grade beams.
2. Composition: corrugated paper material with a moisture resistant exterior, and having an interior fabrication of a uniform, cellular configuration, composed of [Extra Fast] [Fast] [Moderate] [Slow] [Extra Slow] moisture response components.
3. Depth: [(______) inches deep] [depth as indicated on drawings].
4. Profile: [rectangular] [trapezoidal] shape in cross section.
5. Position: [between form panels] [under form panels] [placed in trench].
6. Strength: capable of sustaining an average working load [of (______) p.s.f.] [for wall height of (______) feet based on manufacturer?s recommendations].
7. Accessories:
a. Drilled Pier Forms ? properly form and contain the upper portion of concrete piers.
b. Arcuate End Void Form ? properly creates void space around the upper portion of drilled piers at the intersection with grade beams.
c. Seam Pads ? covers void form joints to prevent moisture and concrete from flowing in between and into the wall void interior.
d. End Caps ? covers exposed ends of void forms to prevent moisture and concrete from flowing into wall void interior.
e. Backfill Retainer (impact-resistant, high-density, polyethylene (HDPE) plastic) ? allows compaction equipment to operate directly adjacent to wall or grade beam. It is designed to prevent the migration of backfill material into the voided area. Retainer should extend at least 4? above the top of the void form. Sizes available: [14? x 36?] [20? x 48?] [26? x 48?]. Refer to manufacturer?s recommendations for installation instructions.
f. Protective Cover Board ([275-C fully wax impregnated paper] [1/8? hardboard] [1/4? hardboard] [(______) inch plywood]) ? distributes working load, bridges small gaps, and protects void material from puncture and other damage during concrete placement. Used in wide footings or grade beams where supports for reinforcing steel are placed directly on void forms.
8. Acceptable Products / Manufacturer: WallVoid, FormVoid, TrenchVoid, TrapVoid, Column Wrap, ArcVoid, Seam Pads, End Caps, SureRetainer by Motzblock, and SureCover Board as manufactured by SureVoid Products, Inc., Englewood, CO
(800) 458-5444 or Fort Worth, TX (888) 803-VOID

************************************************************************************************************************

PART 3 EXECUTION

3.1 INSTALLATION

A. Wall Void Forms:
1. Store void forms and accessories in accordance with manufacturer?s recommendations.
2. Prepare ground surface on an even plane. There should be no capillary break below the void form unless otherwise directed by the designing engineer or architect.
3. Assemble knockdown (K.D.) products as recommended by manufacturer to develop designed strengths.
4. Install wall void forms and accessories in accordance with manufacturer?s recommendations.
5. Use end caps to seal exposed ends. Use seam pads to cover joints to prevent concrete intrusion.
6. Place a layer of protective cover board over void forms as necessary to distribute working load, bridge small gaps, and protect them from puncture and other damage during concrete placement.
7. Protect void forms from moisture, and replace wet or damaged pieces before placing concrete.
8. Immediately protect the base of the wall after forms have been stripped with an HDPE retainer. This will keep backfill material from migrating into the voided area. The retainer should be installed per the manufacturer?s recommendations.


END OF SECTION


   

Re: concrete void material By  beach

Posts: 0

6/1/2009 7:06:00 PM

I''m done..... :p

FOR USE OVER UNSTABLE SOILS FOR:-
? Grade Beams
? Structural Flat Slabs
? Prestressed Box Beams
? Cored Flat Slabs
Bildavoid void form is designed to have adequate strength to support wet concrete until
initial setting is complete. It is also designed to lose strength with prolonged exposure to moisture which soon accumulates beneath slabs and beams.

ALSO USED FOR:-
? Hollow Beams
? Hollow Mass Concrete Installations
? Acoustic purposes
?
Care should be taken to keep BildaVoid void form protected from weather and they should be laid as close to the time of pouring as possible.
BildaVoid void form should not be point loaded

ADVANTAGES OF VOIDFORM
? Forms a cushion between soil and structure.
? Supports the grade beam and slab until it reaches strength
? Provides a void to protect grade beams and slabs from negative pressures which cause cracking and breaking. After a time VOIDFORM absorbs ground pressures because of the action of soil acids, bacteria and moisture on the material. Eventually a void remains beneath the concrete.

TYPES OF VOIDFORM
1. Standard Void form for floor slabs may be Cellular (formed) panels or block
panels.
2. Void form block panels (semi-cellular). These consist of layers of fibreboard which
can be cut to size. They are supplied pre-assembled and have high dead loading
resistance and slower decomposition rates.


SUGGESTED SPECIFICATION
On ground surfaces that are completely firm and level, place VOIDFORMS and cover same with a waterproof membrane. Do not lay out VOIDFORMS until ready to place concrete. All VOIDFORMS stored on site must be protected at all times, off the ground in a manner to keep thoroughly dry but ventilated to prevent steaming.
Other trades shall co-operate by protecting forms by providing necessary walkways to prevent point loading. If concrete is to be wheeled into place, proper runways shall be provided.


   

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