SikaEmaco®-488 CI

SikaEmaco®-488 CI is a one-component rheoplastic, silica-fume modified, fiber-reinforced repair mortar with an integral corrosion inhibitor.

1 year when properly stored

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

2,275 kg/m³ (139 lb/ft³)

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.

¹No epoxy-bonding agent was used.

45 minutes

0.013 m³ (0.45 ft³) per 25 kg (55 lb) bag

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.

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 SikaTop® Armatec®-110 EpoCem®.

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 Sika^® Galvashield^® XP or SikaTop® Armatec®-110 EpoCem® 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

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.

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 (1½ in) per pass. For depths greater than 38 mm (1½ 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.

Finishing

After placing SikaEmaco®-488 CI, the surface must be immediately levelled using a wooden float. 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 tools and equipment with clean water immediately after use. Once hardened, the material can only be removed mechanically.