SPECIFICATION FOR MM-80 HEAVY DUTY, SEMI-RIGID EPOXY JOINT FILLER

PART 1 - GENERAL

1.01 General Description of Work

Provide all labor, products and equipment required to properly install semi-rigid filler in joints in the interior concrete floor slabs.

1.02. Scope of Work

Areas of work include freezers, coolers and ambient temperature areas. Fill all contraction (control) and construction (formed) joints in the interior concrete floor slab where the joints will be exposed to material handling vehicle wheels. Refer to drawings for additional joints possibly requiring filler, such as joints under racks, joints at column diamonds and pads, etc.

1.03. Applicable Standards

Products and installation shall be in compliance or exceed the joint filling criteria established in the latest ACI 302 and ACI 360 Committee published documents.

1.04 Contractor Qualifications

Installer shall have a minimum of three (3) years experience in the installation of semi-rigid fillers on industrial floors.

2. PRODUCTS

2.01 Product(s)

Joint filler for all areas with operating temperatures 40 degrees F or greater shall be “MM-80”, a semi-rigid epoxy manufactured by Metzger/McGuire, Concord, NH (800-223-6680). No substitutes will be allowed.

2.02 Accessories

Silica sand may be used at contractor’s option to choke-off shrinkage cracks beneath filler. Silica must be dry, bagged, of 20 to 40 grit. Compressible backer use is prohibited other than for non-saw cut construction joints. Refer to installation section for additional information.

3. EXECUTION

3.01 Project Conditions

Work area should be free of obstructions and other trades. Slab should be visibly dry and not be scrubbed for at least 24 hours prior to filler installation.

3.02 Timing of Installation

ACI recommends that filling be deferred as long as possible to allow for maximum slab shrinkage and joint widening. For ambient temperatures a 90-120 day slab cure is advisable. Deferring filling until after facility is under permanent temperature control is best, if possible.

3.03 Examination of Conditions

It is the responsibility of the installer to inspect project and joint conditions and notify on-site management in writing of any deficiencies that might adversely affect the quality or durability of the work performed or his contract price. Start of work by the installer implies acceptance of conditions.

3.04 Pre-Installation Sample

Before start of actual work contractor shall install samples to demonstrate his intended procedures and finished product. Sample shall include at least 25’ each of both contraction and construction joints, in both ambient and refrigerated areas, in the presence of on-site management. If procedures and finished product are approved they will be considered a standard for the entire project.

3.05 Joint Preparation

All saw-cut joints shall be thoroughly cleaned to their full depth or 2”. Construction (formed) joints that are not sawn shall be cleaned to a minimum depth of 2”. Preparation shall be performed using a vacuum-equipped saw that will reach the 2” minimum depth, and shall be used in a manner that takes both joint walls back to bare concrete, removing all saw laitance, curing compounds, sealers, debris, etc. Where joints have minor edge chips, said chips will be “squared off” and filled along with the joint itself.

3.06 Choking-Off Joint Bottom

The installer may, at his option, use a maximum of 1/4” of silica sand placed at the bottom of the saw-cut joints to prevent filler run-thru into the shrinkage crack. Compressible backer rod is prohibited in saw-cut joints unless they exceed 2” deep. Compressible backer rod may be used in through-slab (non-sawn) construction joints but must be recessed at least 2” below the slab surface.

Caution: The use of backer rod in any saw-cut joints less than 2” deep will result in the rejection of all saw-cut joints work.

3.07 Filler Installation; MM-80 Epoxy

a. Pre-mix the MM-80 resin (A part), combine with part “B”

and mix in accordance with manufacturers instructions.

b. Dispense MM-80 into joint and fill to within 1/2” of

top. Allow to settle for 15-60 minutes, then apply second

pass. Overfill (crown) with second pass and allow to cure.

c. After MM-80 has cured into a firm solid, razor off excess,

leaving a flush profile. If MM-80 is hard to razor or

rachets, heat filler slightly before razoring.