These are similar to the polystyrene foam wallform systems, but without the environmental deficits. Material is largely from recycled wood pallets. Care must be taken in shipping and handling to prevent breakage and the resulting waste. Giving essentially concrete walls, they must be designed accordingly with proper reinforcing.

SECTION 03600 — WOOD-CEMENT WALLFORMS


PART 1 — GENERAL

1.01 DESCRIPTION

The extent of wood-cement wallforms (“WF”) is shown on the Drawings. This Section includes concrete fill and steel reinforcing related to the WF construction.

1.02 REFERENCE STANDARDS

Except as modified by the requirements of these Contract Documents comply with ACI 301 "Specifications for Structural Concrete Buildings" ACI 318 "Building Code Requirements for Reinforced Concrete"

See Cold Weather Conc. Checklist if applicable…
Follow one of the following, as appropriate
ACI 306.1 "Standard Specification for Cold Weather Concreting".
ACI 305 "Standard Specification for Hot Weather Concreting".

1.03 SUBMITTALS

If requested, submit to Architect written certificates, signed by concrete producer and Contractor, of materials and mix proportions used and slump test reports for slump and compression strength.

1.04 DELIVERY, STORAGE & HANDLING

Store on pallets on level ground in original wrapping until ready to use. Handle carefully to prevent breakage of units.


PART 2 — PRODUCTS

2.01 WOOD-CEMENT WALLFORMS

Stackable permanent concrete wall formwork, fabricated of Portland cement-impregnated wood fiber, with a minimum of 80% recycled wood.
Compressive strength = 800 psi.
Size: 12" overall thickness, 1' to 3' lengths as required by layout
Insulation inserts: 3" thick [rigid mineral wool][extruded polystyrene]
Manufacturer: Midwest Faswall, 404 N. Forrest Avenue, Ottumwa, Iowa 52501 515/682-1212 Fax:515/683-1212

2.02 CONCRETE MATERIALS

Portland Cement: ASTM C 150
Aggregates: ASTM C 33.
Water: Clean, drinkable.
Air-Entraining Admixture: ASTM C 260.
Water-Reducing Admixture: ASTM C 494, type as required to suit project conditions. Only use admixtures which have been tested and accepted in mix designs, unless otherwise acceptable.

2.03 MIX PROPORTIONS AND DESIGN

Proportion mixes complying with mix design procedures specified in ACI 301.

Use air-entraining admixture in all concrete, providing from 2.5% to 4.5% .

Mix concrete according to the following:

	Wood-Cement Wallforms
Water-cement ratio	8 gal/sack
Cement content	5-1/2 bags/yd.
Maximum aggregate size	3/8" pea gravel
Slump	10" to 11"
Minimum 28 day compressive strength	3500 psi

2.04 ADDITIONAL FORM MATERIALS

Provide additional form materials with sufficient stability to withstand pressure of placed concrete without bow or deflection. For exposed concrete surfaces, provide form materials suitable to project conditions. Secure to WF as required.

2.05 REINFORCING MATERIALS

Deformed Reinforcing Bars: ASTM A 615, Grade 60.


PART 3 — EXECUTION

3.01 WALLFORM INSTALLATION

Follow the manufacturer’s instructions for the installation of WF. Place protruding footing/foundation wall reinforcing rods to align with the WF cores. Prepare bracing and framing for openings in advance of WF installation.

Embed the first course of WF in a mortar bed to plumb and level. Place WF tightly together in a running bond, avoiding gaps between blocks. Cut and handle WF with care to avoid damage; reject any WF with defects or cracks. Galvanized screws may be used to secure WF and bracing during erection.

Align cores of WF; construct so that concrete members and structures are of correct size, shape, alignment, elevation and position. Provide openings in WF and coordinate to accommodate the work of other trades. Educate other tradespeople as required regarding cutting and handling of WF to avoid damage and inaccuracies. Accurately place and securely support items built into forms as WF is set. Secure cutouts or open areas of WF to prevent leakout of concrete.

At pilasters and wall intersections, cut openings in the sides of each course of adjacent WF to install continuous steel reinforcing and allow free flow of concrete.

Reinforcement: Position, support and secure reinforcement against displacement. Locate and support with metal spacers and hangers as required. Set wire ties so ends are directed into concrete. Bend reinforcing around corners; minimum overlap of all reinforcing = 12"

Embedded Items: Set and build into work anchorage devices and other embedded items required for other work that is attached to, or supported by cast-in-place concrete. Use setting diagrams, templates and instructions provided by others for locating and setting.

3.02 PLACING CONCRETE

For job site mixing, use drum type batch machine mixer,mixing not less the 1-1/2 minutes for one cu. yd. or smaller capacity. Increase mixing time at least 15 seconds for each additional cu. yd. or fraction thereof.

For ready-mix concrete, comply with ASTM C 94. Place concrete by direct chute, by bucket and crane, or by pumping with a 2" nozzle.

Maximum height of concrete pour into WF = 4'-6". Do not pour individual vertical cores to full height; place concrete such that the concrete level rises evenly over a 6’ to 8’ horizontal run of WF. At the top of each successive pour, fill the top of each course halfway full only, to provide keying for the subsequent course.

Inspect, clean and adjust WF prior to concrete placement. Do not stand on, lean against or otherwise disturb WF during placing of concrete or curing.

Concrete Placement: Comply with ACI, placing concrete in a continuous operation within planned joints or sections. Do not begin placement until work of other trades affecting concrete is completed. Consolidate placed concrete with hand rodding and tamping, so that concrete is worked around reinforcement and other embedded items and into forms. Do not allow mechanical vibrating equipment to make direct contact with the WF.

3.03 PROTECTIONS

Protect concrete from physical damage, reduced strength or weathering resistance due to weather extremes during mixing, placement and curing.


END SECTION 03600