Product Data Sheet Show all documents

SikaEmaco® 425 Gel Patch

(former MEmaco N 425)

Non-sag concrete repair mortar with integral corrosion inhibitor for vertical and overhead applications

SikaEmaco® 425 Gel Patch is a trowel-grade, lightweight, polymer-modified, silica fume-enhanced repair mortar with an integral corrosion inhibitor

  • Non-sag consistency able to be placed in 51 mm (2 in) thick lifts
  • Readily sculpted, shaved, and finished to match the existing substrate
  • Very low chloride permeability and an integral corrosion inhibitor protect reinforcing steel
  • Only requires the addition of potable water
  • Low shrinkage produces a stable, durable bond
  • Lightweight microscopic beads improve vertical and overhead workability
  • Polymer modification improves adhesion and provides increased freeze/thaw stability
Product Data Sheet Show all documents

Usage

  • Interior and exterior
  • Vertical and overhead
  • Above and below grade
  • Spalls or holes in concrete
  • Deteriorated edges
Substrates
  • Concrete
  • Masonry
  • Structural Concrete
 

Advantages

  • Non-sag consistency able to be placed in 51 mm (2 in) thick lifts
  • Readily sculpted, shaved, and finished to match the existing substrate
  • Very low chloride permeability and an integral corrosion inhibitor protect reinforcing steel
  • Only requires the addition of potable water
  • Low shrinkage produces a stable, durable bond
  • Lightweight microscopic beads improve vertical and overhead workability
  • Polymer modification improves adhesion and provides increased freeze/thaw stability

Packaging

19.5 kg (43 lb) polyethylene-lined bags

Product Details

Product Information

Composition / Manufacturing

SikaEmaco® 425 Gel Patch is composed of crystalline (quartz) silica and Portland cement.

Shelf Life

12 months when properly stored

Storage Conditions

Store in unopened containers in a cool, clean, dry area

 
Technical Information

Compressive Strength

1 day

14.8 MPa (2,150 psi)

7 days

38.6 MPa (5,600 psi) 

28 days

46.5 MPa (6,750 psi)

*At 50% relative humidity

Tensile Strength in Flexure

1 day

3.4 MPa (500 psi)

7 days

5.5 MPa (800 psi)

28 days

7.7 MPa (1,110 psi)

Shear Strength

Bond Strength

1 day

6.2 MPa (900 psi)

7 days

13.1 MPa (1,900 psi)

28 days

16.9 MPa (2,450 psi)

Expansion

1 day

+0.019% wet cure

−0.026% dry cure*

7 days

+0.028% wet cure−0.11% dry cure*

28 days

+0.034%  wet cure−0.15% dry cure*

Coefficient of Thermal Expansion

Linear coefficient of thermal expansion

9.5 x 10-6 mm/mm/°C (5.3 × 10−6 in/in/°F)

(ASTM C531)

Freeze Thaw De-Icing Salt Resistance

Scaling Resistance

0.0 kg/m² (0.0 lb/ft²) No Scaling at 50 cycles

(ASTM C672)

Freeze thaw resistance

98.8% RDM

(ASTM C666 A)

Modulus of Elasticity in Shear

3.86 GPa (5.6 x 105psi)

(ASTM C215)

Water Absorption

4% at 28 days

(ASTM C642)

Splitting Tensile Strength

1 day

2.1 MPa (310 psi)

7 days

3.9 MPa (560 psi)

28 days

4.2 MPa (610 psi)

Application

Application Information

Application Time

20-30 min at 21 °C (70 °F)
Consumption

Yield

0.012 m3 (0.43 ft3) per 19.5 kg (43 lb) bag
Application steps

NOTES ON INSTALLATION

  • Do not bridge moving cracks or joints.
  • Do not overwork material
  • Do not add plasticizers, accelerators, retarders, or other additives.
  • Do not extend with aggregate.
  • Bonding agents are recommended for large areas as well as permanently damp areas.
  • Protect from freezing for 24 hours after application.
  • For professional use only; not for sale to or use by the general public.
  • Make certain the most current versions of the product data sheet and SDS are being used.
  • Proper application is the responsibility of the user. Field visits by Sika personnel are for the purpose of making technical recommendations only and not for supervising or providing quality control on the jobsite.

SURFACE PREPARATION

  1. The substrate must be structurally sound and fully cured (28 days).
  2. Saw cut the perimeter of the area being repaired into a square with a minimum depth of 6 mm (¼ in) .
  3. The surface to be repaired must be clean, free of laitance, and saturated surface-dry (SSD) following ICRI Guideline no. 310.2 to permit proper bond.

Reinforcing Steel

  1. Remove all oxidation and scale from the exposed reinforcing steel in accordance with ICRI Technical Guideline No. 310.1R.
  2. For additional protection from future corrosion, coat the prepared reinforcing steel with Sikagard® P 8100 AP or SikaTop® Armatec®-110 EpoCem®.

MIXING

  1. Precondition material to 21 °C ± 3 °C (70 °F ± 5 °F)  before mixing.

  2. Mechanically mix at a slow speed with a 19 mm (3/4 in) drill and mixing paddle.

  3. Add approximately 2.6 L (0.68 US gal) of potable water into a clean mixing container. Gradually sift in powder 1/3 at a time while mixing continuously at a slow speed (high speeds may entrain air). Mix for a minimum of 3 minutes to ensure a uniform, lump-free consistency. Do not exceed a total of 2.8 L (0.74 US gal) of mixing water per 19.5 kg (43 lb) bag.

APPLICATION

  1. Dampen the surface with potable water; it must be saturated surface-dry (SSD) with no standing water.
  2. With a gloved hand, scrub a small quantity of mixed material into the SSD substrate. Thoroughly key in and work the material throughout the cavity to promote bond. Do not apply more of the bond coat than can be covered with mortar before the bond coat dries.
  3. Apply material in lifts of 6-51 mm (1/4-2 in). Avoid feather edging. For optimum mechanical bond on successive lifts, thoroughly score each lift and allow it to reach the initial set before the next layer is applied. Placement time is 20-30 minutes at 21 °C (70 °F)  and 50% relative humidity.
  4. Trowel, shave, or shape the material to the desired finish after the initial set.
  5. The recommended application range of SikaEmaco® 425 Gel Patch is from 4 to 32 °C (40 to 90 °F). Follow ACI 305 and 306 for hot or cold weather guidelines.

CURING TREATMENT

Cure with an approved water-based curing compound compliant with ASTM C309 or preferably ASTM C1315. If the repair area will receive a coating, wet curing is recommended.

CLEAN UP

Clean tools and equipment with clean water immediately after use. Cured material must be removed mechanically.

 

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