SikaEmaco®-488 CI
(former MasterEmaco® S 488CI)
Sprayable, fibre-reinforced, structural repair mortar with integral corrosion inhibitor
SikaEmaco®-488 CI is a one-component, shrinkage-compensated, fibre-reinforced repair mortar containing an integral corrosion inhibitor. It can be applied vertically or overhead by low-pressure spraying or hand troweling.
- Only requires the addition of potable water
- Achieves a tenacious bond to substrate without the need for a bonding agent
- Low-pressure sprayability improves placement speed and minimizes rebound for low-waste
- Sulfate-resistant and freeze/thaw durable for use in harsh environments
- Very low chloride permeability and an integral corrosion inhibitor protect reinforcing steel
- High early and ultimate compressive, flexural, and bond strengths for long-lasting, durable repairs
- Low shrinkage to produce a stable, durable bond
Usage
- Interior and exterior
- Vertical and overhead
- Severe service environments such as sewer, lift stations, marine structures, and water collection
- Concrete
- Masonry
- Brick
Advantages
- Only requires the addition of potable water
- Achieves a tenacious bond to substrate without the need for a bonding agent
- Low-pressure sprayability improves placement speed and minimizes rebound for low-waste
- Sulfate-resistant and freeze/thaw durable for use in harsh environments
- Very low chloride permeability and an integral corrosion inhibitor protect reinforcing steel
- High early and ultimate compressive, flexural, and bond strengths for long-lasting, durable repairs
- Low shrinkage to produce a stable, durable bond
Packaging
25 kg (55 lb) polyethylene-lined bags
Product Details
Composition / Manufacturing
SikaEmaco®-488 CI is a one-component rheoplastic, silica-fume modified, fiber-reinforced repair mortar with an integral corrosion inhibitor.
Shelf Life
1 year when properly stored
Storage Conditions
Store in unopened bags in a cool, clean, dry area
Density
2,275 kg/m3 (139 lb/ft3)
Compressive Strength
1 day | 24.1 MPa (3,500 psi) |
7 day | 45.5 MPa (6,600 psi) |
28 day | 62.1 MPa (9,000 psi) |
Modulus of Elasticity in Compression
34.5 GPa (5.0 x 106 psi) at 28 days | (ASTM C469) |
Tensile Strength in Flexure
1 day | 4.5 MPa (650 psi) |
7 day | 6.9 MPa (1,000 psi) |
28 day | 9.0 MPa (1,300 psi) |
Splitting Tensile Strength
1 day | 2.4 MPa (350 psi) |
7 day | 3.5 MPa (500 psi) |
28 day | 6.2 MPa (900 psi) |
Pull-Off Strength
1 day | 0.7 MPa (100 psi) |
7 day | 1.2 MPa (175 psi) |
28 day | 2.1 MPa (300 psi) |
Shear Adhesion Strength
1 day | 10.3 MPa (1,500 psi) |
7 day | 17.2 MPa (2,500 psi) |
28 day | 20.7 MPa (3,000 psi) |
1No epoxy-bonding agent was used.
Shrinkage
0.09 % at 1 day | (ASTM C157, modified2) |
2ICRI Guideline No. 320.2R “Guide for Selecting and Specifying Materials for Repair of Concrete Surfaces” (formally No. 03733), 25 mm x 25 mm x 250 mm (1 in x 1 in x 10 in) prism, air cured.
Sulfate Resistance
< 0.10 % 6 months | (ASTM C1012) |
Freeze thaw resistance
91.0 % RDM at 300 cycles | (ASTM C666, Procedure A) |
Freeze Thaw De-Icing Salt Resistance
None at 50 cycles | (ASTM C672) |
Application
Setting Time
Working time
45 minutes
Initial Set Time
< 4 hours | (ASTM C266) |
Final Set Time
< 7 hours | (ASTM C266) |
Yield
0.013 m3 (0.45 ft3) per 25 kg (55 lb) bag
NOTES ON INSTALLATION
SikaEmaco®-488 CI is designed for professional use only; not for sale to or use by the general public.
- Precondition material to approximately 21 °C (70 °F) for 24 hours before using.
- Protect repairs from direct sunlight, wind, and other conditions that could cause rapid drying of material.
- Do not mix partial bags.
- Minimum ambient and surface temperatures should be 7 °C (45 °F) and rising at the time of application.
- 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.
SUBSTRATE PREPARATION
The substrate must be structurally sound and fully cured (28 days). Saw cut the perimeter of the area to be repaired into a square with a minimum depth of 6 mm (1/4 in). 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. For most applications, a CSP 4 - 10 will promote sufficient bond.
Reinforcing Steel
Remove all oxidation and scale from the exposed reinforcing steel in accordance with ICRI Technical Guideline No. 310.1R. For additional protection from future corrosion, coat the prepared reinforcing steel with Sikagard® P-8100 AP.
Reinforcing Mesh
Use a 102 x 102 mm (4 in x 4 in) low-gauge (10 - 12) mesh firmly tied into the properly prepared substrate. If repairing chloride-contaminated concrete consider using galvanized or stainless mesh. Locate the mesh no closer than 10 mm (3⁄8 in) and no more than 25 mm (1 in) from the finished surface using spacers and concrete anchors.
Note that mesh is not necessary in applications with side restraints, such as square-cut patches or areas where existing concrete reinforcement will provide adequate restraint. For depths over 51 mm (2 in), consult your Sika Technical Sales Representative.
Note: The use of galvanic anodes or Sikagard® P-8100 AP should also be considered to protect adjacent concrete in the following situations:
- When applying SikaEmaco®-488 CI mortar in repairs greater than 3 m (10 lineal feet) in the longest direction
- In overlays at depths of 25 - 38 mm (1 - 1½ in) or greater
- For overhead applications of the same size
MIXING
Add 2.7 - 3.8 L (0.7 - 1.0 US gal.) of potable water per 25 kg (55 lb) bag. Mechanically mix using a forced-action mortar mixer of appropriate size. Pour approximately 90 % of the mix water into the mixing container, and then charge the mixer with the bagged material. Add the remaining mix water as required. Mix the material for three (3) to five (5) minutes until it has reached a homogeneous consistency. For overhead applications, use a stiffer mix.
APPLICATION
Hand-trowel Application
Dampen the surface with potable water; it must be saturated surface-dry (SSD) with no standing water. 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. Apply SikaEmaco®-488 CI in lifts of 6 - 51 mm (1/4 - 2 in). Avoid featheredging. 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 45 minutes at 21 °C (70 °F ) and 50 % relative humidity. Trowel material to the desired finish after the initial set. The recommended application range of SikaEmaco®-488 CI is from 7 °C to 32 °C (45 °F to 90 °F). Follow ACI 305 and 306 for hot or cold weather concreting guidelines.
Spray Application
Spray application is recommended for larger repairs refer to ACI RAP 3.
Applicators must have a thorough knowledge of pump and spray equipment before spray-applying SikaEmaco®-488 CI. Use normal techniques of pumping water first and then a cement slurry to prime and lubricate the base (neither being applied to the repair area). Be careful not to get too far ahead of the finishing crew; SikaEmaco®-488 CI mortar stiffens rapidly after placement. Periodic cleaning of the pump may be helpful when applying large quantities.
SikaEmaco®-488 CI may be applied on vertical or overhead surfaces at thicknesses ranging from 10 mm to 51 mm (3⁄8 to 2 in). For thicknesses exceeding 51 mm (2 in), consult your Sika Technical Sales Representative. Achieve a thicker build by making multiple passes with the spray nozzle.
Remarks:
- SikaEmaco®-488 CI can be applied vertically in a thickness up to 51 mm (2 in) in a single lift.
- Unless forming is used, the overhead application should be no more than 38 mm (11/2 in) per pass. For depths greater than 38 mm (11/2 in), succeeding lifts of no more than 25 mm (1 in) should be used.
- MULTIPLE LIFTS: Timing between lifts is critical and will vary with several factors, including mix consistency, mix and ambient temperature, wind conditions, humidity, and application technique. Succeeding lifts may be placed after the repair mortar has developed the initial set. Roughen or profile the preliminary lifts to ensure the adhesion of subsequent lifts. When succeeding lifts will not be applied the same day, keep the surface continually moist.
CURING TREATMENT
Finishing
After placing SikaEmaco®-488 CI, the surface must be immediately levelled using a wooden float. In hot, dry, or windy conditions, the use of Sika® Antisol® ER 50 evaporation reducer is recommended. Start final finishing when the mortar has begun to set using a wooden or sponge float.
Curing
Wet cure for a minimum of seven (7) days or cure with an approved curing compound compliant with ASTM C309 or preferably ASTM C1315.
CLEAN UP
Clean tools and equipment with clean water immediately after use. Once hardened, the material can only be removed mechanically.