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No. 383

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MEADOW-CRETE® H2

TWO-COMPONENT, POLYMER MODIFIED, HORIZONTAL REPAIR MORTAR

DESCRIPTION
MEADOW-CRETE H2 is a two-component, trowel applied, corrosion inhibitor enhanced, polymer modified, shrinkage-compensated, cementitious repair mortar for horizontal applications.

USES
MEADOW-CRETE H2 is designed for horizontal repairs of concrete, both small and large areas, interior and exterior applications, a minimum of 1/4" deep. MEADOW-CRETE H2 is suitable for industrial and civil engineering applications.

FEATURES AND BENEFITS

• Polymer modified / Enhanced bond
• Low permeability / Protects embedded reinforcing steel
• Shrinkage compensated / Added dynamic stability
• Good abrasion resistance / Increased wear resistance for longevity
• Creamy consistency / Easily finished
• Excellent freeze-thaw resistance / Long term stability
• Migrating corrosion inhibitor enhanced / Protects localized and adjacent reinforcing steel

TECHNICAL DATA
The following physical properties were determined using the maximum liquid (ACRY-LOK™) to powder ratio of 1-gallon (3.78 L) per 55 lb. bag at 75ºF (23.5ºC).

Set Time Per ASTM C 191 Initial 2.5 hours Final 4 hours Working Time  30 mins. Flow Per ASTM C 191¹  112%

Compressive Strength Per ASTM C 109¹ @ 1 day 3,500 psi (24MPa) @ 7 days 6,700 psi (46 MPa) @ 28 days 7,750 psi (53.5 MPa)

Bond Strength Per ASTM C 882¹² @ 1 day 725 psi (5 MPa) @ 28 days 1850 psi (13 MPa) Modulus of Elasticity Per ASTM C 469¹ 2.18 x 106 psi (15.0 GPa) Length Change Per ASTM C 157¹ (Modified) Drying Shrinkage @28 days -0.077% (770 µ strain) Length Change Per ASTM C 157¹ (Modified) Specimens stored at 73ºF & 50% RH, continuously Drying Shrinkage @28 days -0.1230% (1230 µ strain) Flexural Strength Per ASTM 348¹ @ 1 day 600 psi (4 Mpa)  @ 28 days 1,600 psi (11 Mpa) Freeze-Thaw Resistance Per ASTM C 666 (Procedure A)¹ At 300 Cycles 92% RDM³

All technical data is typical information, but may vary due to testing methods, conditions and procedures. ¹ Independent Reports Are Available Upon Request. ² Modified – No Bonding Agent used. Pre-dampening of properly prepared substrate. ³ RDM - Relative Dynamic Modulus

PACKAGING & YIELD

• 55lb. (25 kg) bag yields: 0.48 cu. ft.
• Extended with 12.5 lbs. (5.68 kg) of aggregate yields 0.56 cu. ft.
• Extended with 25 lbs. (11.36 kg) of aggregate yields 0.64 cu. ft

SHELF LIFE
12 months when stored on pallets in a dry, cool area

FOR BEST PERFORMANCE

• MEADOW-CRETE H2 is recommended for concrete repairs only.
• Not intended to be used as a self-leveling underlayment or topping; H2 is designed as a trowel down repair mortar.
• Do not apply below 40°F (4°C) or above 90°F (32°C) or when rain is imminent.
• Protect from freezing for a minimum of 24 hours.
• Do not bridge moving cracks. Extend existing control and expansion joints through MEADOW-CRETE H2.
• For large areas with no control, expansion or construction joints, refer to ACI guidelines.
• Do not exceed a length-to-width ratio of 2 to 1 for the repair area.
• Do not add any admixtures.
• Exceeding liquid requirements shall result in reduced physical properties.
• Realize that set time will decrease as the product, air, substrate and mixing liquid temperature increases and will increase as the temperature decreases.
• Repair areas should be saw cut and slightly undercut to a minimum depth of a 1/4" (6 mm). Do not featheredge.
• Protect from conditions that may cause early water loss; windy, low humidity, high temperature and direct sunlight. Early water loss is exasperated in thin applications.
• Realize that the use of extender aggregate will alter physical properties.
• Failure to follow industry standard practices may result in decreased material performance.
• Proper application is the responsibility of the user. Field visits by W. R. MEADOWS personnel are for the purpose of making technical recommendations only, and are not to supervise or provide quality control on the job-site.

SURFACE PREPARATION
Perform surface preparation in accordance with ICRI Technical Guidelines No. 03730. Mechanically abrade existing substrate to remove all unsound concrete, but do not use excessive force, which may cause micro-fracturing. Substrate must be structurally sound and free of any contaminants that will adversely affect bond. Prepared surface must be dust-free and have sufficient profile to ensure adequate mechanical lock. Saw cut perimeter of repair zone to a depth of 1/4" to avoid featheredging.

Completely expose all reinforcing steel, ensuring a minimum clearance of 3/4" behind reinforcing steel. Perform reinforcing steel preparation in accordance with ICRI Technical Guidelines No. 03730.

Pre-soak repair zone, prior to application of slurry coat to a saturated, surface dry (SSD) condition and free of standing water. Prime (SSD) substrate with a slurry coat (2 parts MEADOW-CRETE H2 powder to 1 part ACRY-LOK from W. R. MEADOWS. Allow slurry coat to become tacky prior to application of MEADOW-CRETE H2. Do not allow slurry coat to become tack-free.

MIXING
Mix only complete bags. Using a mortar-type mixer, pour 3/4 of the 1-gallon container of ACRY-LOK into the mixer. Slowly add MEADOW-CRETE H2 while mixing. Mix for 3-5 minutes or until homogeneous and lump-free. Adjust mix consistency using the remaining 1/4 of container of ACRY-LOK. If extending, follow additional instructions below. For small repairs, mix in a clean vessel, using a variable-speed drill with a mixing paddle designed for mixing mortars (not liquids) at 400-600 rpm. Do not over-mix.

EXTENSION
Applications greater than 2" must be extended with 12.5 lbs. (5.68 kg) of 3/8" washed, dried pea gravel. Applications greater than 4" must be extended with 25 lbs. (11.36 kg) of 3/8" washed, dried pea gravel. The extender aggregate must be added to the mixer prior to the addition of MEADOW-CRETE H2.

PLACEMENT
Compact MEADOW-CRETE H2 into properly prepared SSD substrate prior to bulk placement. Finish surface with a wood or steel trowel or sponge float. MEADOW-CRETE H2 may be applied horizontally up to 4" and beyond, depending on percent of extension used. Do not re-temper or over-work product. Follow ACI 305-R89 "Standard on Hot Weather Concreting" or ACI 306-R88 "Standard on Cold Weather Concreting" when applicable.

CURING
Cure MEADOW-CRETE H2 immediately following application using a suitable water-based curing compound from W. R. MEADOWS, or in accordance with ACI 308. W. R. MEADOWS recommends 2250-WHITE or 1130-CLEAR for curing. (Do not use solvent-based curing compounds.) When conditions exist for rapid early water loss, the use of EVAPRE™, an evaporation retarder from W. R. MEADOWS, is also recommended.

SAFETY AND TOXICITY
Avoid inhalation of dust. Avoid direct contact with this product. Utilize gloves and safety glasses to minimize direct contact. If contact occurs, wash affected areas with mild soap and water. Keep product out of reach of children. Refer to Product Material Safety Data Sheet for complete health and safety information.

This material last updated July, 2004.