03 01 30.71

No. 384

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MEADOW-CRETE® GPS

ONE-COMPONENT, POLYMER MODIFIED VERSATILE REPAIR MORTAR

DESCRIPTION
One-component, trowel applied or pneumatically applied (wet process), migrating-corrosion-inhibitor enhanced, polymer-modified, shrinkage-compensated, fiber reinforced, micro silica enhanced, cementitious repair mortar for horizontal, vertical and overhead applications.

USES
The product is ideal for patches from ¼" to deep horizontal, vertical and overhead repairs and resurfacing of concrete, either small or large areas, interior or exterior application. MEADOW-CRETE GPS is suitable for industrial and civil engineering applications.

FEATURES / BENEFITS

• Fiber Reinforced / Increased Tensile & Flexural Strengths
• Polymer Modified / Enhanced Bond
• Micro Silica Enhanced / Low Permeability / Protects Embedded Reinforcing Steel
• Shrinkage Compensated / Added Dynamic Stability
• Highly Engineered / Low Rebound
• Creamy Consistency / Easily Finished
• Excellent Freeze-Thaw Resistance / Long Term Stability
• Wet Spray Process / Low In-Place Cost
• Migrating-Corrosion-Inhibitor Enhanced / Protects Localized and Adjacent Reinforcing Steel

TECHNICAL DATA
The following physical properties were determined using the maximum water to powder ratio of 3.75 quarts (3.54 L) per 50 lb. bag at 75ºF (23.5ºC)

Set Time Per ASTM C 191 Initial 4 hours Final 6 hours Working Time  2 hours Flow Per ASTM C 928¹  56%	Compressive Strength Per ASTM C 109¹ @ 1 day 2,500 psi (17 MPa) @ 7 days 6,000 psi (41 MPa) @ 28 days 6,750 psi (46.5 MPa)
Bond Strength Per ASTM C 882¹² @ 1 day 700 psi (5 MPa) @ 28 days 2,550 psi (17.5 MPa) Modulus of Elasticity Per ASTM C 469¹ 2.44 x 106 psi (16.8 GPa) Length Change Per ASTM C 157¹ Drying Shrinkage -0.083% (830 µ strain) Flexural Strength Per ASTM 348¹ @ 1 day 675 psi (4.5 Mpa)  @ 28 days 1,450 psi (10 Mpa) Freeze-Thaw Resistance Per ASTM C 666 (Procedure A)¹ At 300 Cycles 112% 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

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

PACKAGING and YIELD
50 LB. (22.7 kg) bag yields: 0.44 cu. ft.
The yield listed above is based on 3.5 quarts (3.30 liters) of water per 50 lb. (22.7 kg) bag and will vary based on substrate profile, aggregate, variations in mix water amounts and waste/rebound. Field trials should be performed to determine yields based on job-site conditions.

FOR BEST PERFORMANCE

• MEADOW-CRETE GPS is recommended for concrete repairs only.
• Not intended to be used as a self-leveling underlayment or topping; GPS 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 GPS.
• 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 be increased 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 a sufficient profile to ensure adequate mechanical lock. Saw cut perimeter of repair zone to a depth of ¼" to avoid featheredging.

Completely expose all reinforcing steel, ensuring a minimum clearance of ¾" behind reinforcing steel. Perform reinforcing steel preparation in accordance with ICRI Technical Guidelines No. 03730.

Pre-soak repair zone prior to application of MEADOW-CRETE GPS to a saturated, surface dry (SSD) condition and free of standing water.

HAND APPLICATION
Prime SSD substrate with a slurry coat (2 parts MEADOW-CRETE GPS powder to 1 part water). For enhanced bonding, use ACRY-LOK™ instead of water. Allow slurry coat to become tacky prior to application of MEADOW-CRETE GPS.

MIXING
Mix only complete bags. Using a mortar type mixer, pour 3.5 –3.75 quarts (3.30-3.54 liters) per 50lb. (22.7 kg.) bag in mixer. Slowly add MEADOW-CRETE GPS. Mix for 3-5 minutes or until homogeneous and lump-free. Do not over mix.

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

MACHINE PLACEMENT
Use low-pressure, wet spray equipment. Follow industry standard nozzle procedures for removal of rebound, spray angle, compaction behind reinforcing steel and appropriate reinforcing steel cover, etc. Cut surface face to desired configuration. Finish with a wood or steel trowel or sponge float. Do not re-temper or overwork. Follow ACI 305-R89 "Standard on Hot Weather Concreting" or ACI 306 R88 "Standard on Cold Weather Concreting", when applicable.

HAND PLACEMENT
Compact MEADOW-CRETE GPS into properly prepared SSD substrate prior to bulk placement. Finish surface with a wood or steel trowel or sponge float. MEADOW-CRETE GPS may be applied up to 3" horizontally and vertically and 2" overhead, dependent on patch size and configuration. Do not re-temper or overwork. Follow ACI 305-R89 "Standard on Hot Weather Concreting" or ACI 306 R88 "Standard on Cold Weather Concreting", when applicable.

CURING
Cure MEADOW-CRETE GPS 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. For industrial use only. Refer to Material Safety Data Sheet for complete health and safety information.

This material last updated July, 2004.