Product Data Sheet Edition 5.16.2007 Identification no. 539 SikaRepair SHA
SikaRepair® SHA Fast-setting, one component, cementitious repair mortar with superior high build properties
Description SikaRepair SHA is a fast-setting, one-component, cementitious ready to use repair mortar. The
incorporation of low density aggregates allows high build applications on vertical and overhead surfaces. SikaLatex R or SikaLatex may be used instead of water for a two component, polymer- modified repair mortar. Where to Use
Fast repairs to overhead and vertical concrete and mortar surfaces on grade, above and below grade.
As a repair material for building facades, parking structures, industrial plants, bridges, etc. Advantages
Minimal time required between lifts.
Fast finishing time.
Time/labor-saving material; application up to 3 inches on vertical surfaces in one layer.
Easy to use; just add water.
High bond strength ensures excellent adhesion.
Good, early and ultimate strength.
Increased freeze/thaw durability and resistance to deicing salts.
Easy to clean.
Suitable for exterior and interior applications.
Not a vapor barrier. Yield 0.55 cu. ft./bag Packaging Sika Repair SHA: 25 lb. bag, 60/pallet; 50 lb. (22.7 kg.) multi-wall bag.
SikaLatex (R): 1 gal. plastic jug; 4/carton, 5 gal. pails.
(Material and curing conditions @ 73°F (23C) and 50% R.H.)
Shelf Life One year in original, unopened bags. Storage Conditions Store dry at 40°-95°F (4°-35°C). Condition material to 65°-75°F
before using. Color Concrete gray. Mixing Ratio 1 50 lb. bag SikaRepair SHA + 3/4 gal. to 1 gal. of liquid Density (Wet mix) 106 lbs./cu. ft. (1.70 kg./l) Application Time Approximately 10-15 minutes. Finishing Time 20-30 minutes Time Between Lifts Less than 1 hour Compressive Strength (ASTM C-109) with Latex R
1 day 2,000 psi (13.8MPa) 2,500 psi (17.2 MPa) 7 days 3,000 psi (20.7 MPa) 3,500 psi (24.1 MPa) 28 days 4,500 psi (31.0 MPa) 5,000 psi (34.5 MPa) Flexural Strength (ASTM C-293)
28 days 800 psi (5.5 MPa) 1,100 psi (9.7 MPa) Bond Strength * (ASTM C-882 modified)
28 days 1,000 psi (6.8 MPa) 1, 800 psi (12.4 MPa) *Mortar scrubbed into substrate
How to Use Substrate Concrete, mortar, and masonry products. Surface Preparation - Concrete/Mortar: Remove all deteriorated concrete, dirt, oil, grease, and all bond-inhib-
iting materials from surface. Preparation work should be done by high pressure water blast, scabbler or other appropriate mechanical means to obtain an exposed aggregate surface profile of ±1/16-in. (CSP-5). After preparation, substrate strength should be verified prior to patch placement. Substrate should be saturated surface dry (SSD) with no standing water during application. Reinforcing Steel: Steel reinforcement should be thoroughly prepared by mechani- cal cleaning to remove all traces of rust. Where corrosion has occurred due to the presence of chlorides, the steel should be high pressure washed with clean water after mechanical cleaning. For priming of reinforcing steel use Sika Armatec 110 EpoCem (consult Technical Data Sheet).
Concrete Substrate: Prime the prepared substrate with a brush or sprayed applied coat of Sika Armatec 110 EpoCem (consult Technical Data Sheet). Alternately, a scrub coat of Sika Repair SHA can be applied prior to placement of the mortar. The repair mortar has to be applied into the wet scrub coat before it dries. Mixing With water: Pour 3/4 of one gallon of water into the mixing container. Add powder while mixing
continuously. Mix mechanically with a low-speed drill (400-600 rpm) and mixing paddle or in an ap- propriate mortar mixer. Add more water to obtain desired consistency of the mortar. Do not exceed one gallon per bag. Mix to uniform consistency, maximum 3 minutes. Manual mixing can be toler- ated only for less than a full unit. Thorough mixing and proper proportioning is necessary. With Latex R: Pour 3/4 gallon of Sika Latex R into the mixing container. Slowly add powder and mix as above. With diluted Latex R: Sika Latex R may be diluted up to 5:1 (water: Sika Latex R) for projects requiring minimal polymer-modification. Pour 3/4 gallon of the mixture into the mixing container. Slowly add powder and mix as above. Note: SikaLatex R must be protected from freezing. If frozen, discard. Application & Finish The mixed SikaRepair SHA must be worked well into the primed substrate, filling all pores and voids.
Compact well. Force material against edge of repair working towards the center. Thoroughly compact the mortar around exposed reinforcement. After filling repair, consolidate, then screed. Finish with steel, wood, plastic floats, or damp sponges, depending on the desired surface texture. Where multiple lifts are required, score top surface on each lift to produce a roughened substrate for next lift. Allow preceding lift to harden before applying fresh material. Saturate surface of the lift with clean water. If previous layers are over 48 hours old, mechanically prepare the substrate and dampen. Curing As per ACI recommendations for portland cement concrete, curing is required. Moist cure with wet
burlap and polyethylene, a fine mist of water or a water based* compatible curing compound. Curing compounds adversely affect the adhesion of following lifts of mortar, leveling mortar or protective coatings. Moist curing should commence immediately after finishing. Protect freshly applied mortar from direct sunlight, wind, rain and frost.
* Pretesting of curing compound is recommended. Limitations
Application thickness: Minimum: With water: 1/4 inch (6 mm). With Latex R: 1/8” (3 mm). Maxi- mum in one lift: 3 inches (75 mm) vertical, 1.5 inches (38 mm) overhead.
Minimum ambient and surface temperatures 45°F (7°C) and rising at time of application.
Do not use solvent based curing compounds. As with all cement based materials, avoid contact with aluminum to prevent adverse chemical reaction and possible product failure. Insulate poten- tial areas of contact by coating aluminum bars, rails, posts etc. with an appropriate epoxy such as Sikadur Hi-Mod 32. Caution Irritant Suspect carcinogen - Contains portland cement and sand (crystalline silica). Skin and eye ir-
ritant. Avoid contact. Dust may cause respiratory tract irritation. Avoid breathing dust. Use only with adequate ventilation. May cause delayed lung injury (silicosis). IARC lists crystalline silica as having sufficient evidence of carcinogenicity in laboratory animals and limited evidence of carcinogenic- ity in humans. NTP also lists crystalline silica as a suspect carcinogen. Use of safety goggles and chemical resistant gloves is recommended. If PELs are exceeded, an appropriate NIOSH approved respirator is required. Remove contaminated clothing. First Aid In case of skin contact, wash thoroughly with soap and water. For eye contact, flush immediately
with plenty of water for at least 15 minutes, and contact a physician. For respiratory problems, remove person to fresh air. Clean Up In case of spillage, scoop or vacuum into appropriate container, and dispose of in accordance with
current, applicable local, state and federal regulations. Keep container tightly closed and in an upright position to prevent spillage and leakage. Mixed material: Uncured material can be removed with water. Cured material can only be re- moved mechanically.
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