Product Data Sheet
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Sikacrete®-321 FS

Sikacrete®-321 FS

One-component, cementitious, pourable, rapid hardening concrete mix

Sikacrete®-321 FS is a one-component, Portland-cement concrete containing factory blended coarse aggregate designed for quick turnaround patching and overlay needs.

  • Very rapid setting structures can be opened to vehicular traffic in 2 hours
  • Non-gypsum based with volume stability
  • Compatible with coefficient of thermal expansion of concrete
  • Increased resistance to deicing salts
  • Easily applied to clean, sound substrate
  • Excellent resistance to freeze/thaw with outstanding durability
  • Pre-packaged coarse aggregate: Eliminates need to extend material in the field; Eliminates the risk of reactive aggregate
  • Formulated to compensate for shrinkage
Product Data Sheet
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Usage

  • As a structural repair material for bridges, parking facilities, industrial plants and walkways
  • On horizontal, vertical and overhead surfaces (formed)
  • On grade, above, and below grade on concrete
  • Full depth repairs
  • Filler for voids and cavities
 

Advantages

  • Very rapid setting structures can be opened to vehicular traffic in 2 hours
  • Non-gypsum based with volume stability
  • Compatible with coefficient of thermal expansion of concrete
  • Increased resistance to deicing salts
  • Easily applied to clean, sound substrate
  • Excellent resistance to freeze/thaw with outstanding durability
  • Pre-packaged coarse aggregate: Eliminates need to extend material in the field; Eliminates the risk of reactive aggregate
  • Formulated to compensate for shrinkage

Packaging

65 lb. (29.5 kg) bag

Color

Dark gray powder

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

Complies with ASTM C-928 specifications for very rapid and rapid hardening mortars
Product Information

Shelf Life

12 months from date of production if stored properly in original, unopened and undamaged sealed packaging

Storage Conditions

Store dry at 40–95 °F (4–35 °C).

Protect from moisture. If damp, discard material

 
Technical Information

Compressive Strength

2 hour

2,500 psi (17.2 MPa)

3 hour3,000 psi (20.7 MPa)
1 day5,000 psi (34.5 MPa)
7 days6,000 psi (41.4 MPa)
28 days7,500 psi (51.7 MPa)

Flexural Strength

28 days

700 psi (4.8 MPa)

Splitting tensile strength

1 day

400 psi (2.8 MPa)

7 days

600 psi (4.1 MPa)

Tensile Adhesion Strength

7 days

>250 psi (1.7 MPa)

Slant Shear Strength

1 day

2,500 psi (17.2 MPa)

7 days

3,000 psi (20.7 MPa)

* Mortar scrubbed into substrate (73 °F (23 °C) and 50 % R.H.)

Shrinkage

< 0.06 %

(ASTM C-157 modified per ASTM C-928)

Freeze-Thaw Stability

300 cycles>  90 %

Rapid Chloride Permeability

28 days< 1,500 Coulombs

Application

Application Information

Mixing Ratio

5 pts. (2.4 L)

Layer Thickness

Min.

Max.

1" (25 mm)

8" (203 mm)

Consistency

Initial Slump

7–9” (178–229 mm)

Slump at 15 minutes

> 5–7” (127–178 mm)

Product Temperature

65–75 °F (18–24 °C)

Ambient Air Temperature

> 45 °F (7 °C)

Substrate Temperature

> 45 °F (7 °C)

Pot Life

 ~ 30 minutes

As the temperature will affect the pot life, application temperature:

  • Above 73 °F (23 °C) will reduce the pot life and slump.

  • Below 73 °F (23 °C) will extend the pot life and slump

Set Time

40–50 minutes

(ASTM C-266)

Final set time

50–60 minutes

(ASTM C-266)

 
Consumption

Coverage

0.5 ft3  (0.01 m3) per bag

(Coverage figures do not include allowance for surface profile and porosity or material waste)
Application steps

MIXING

  • Place 5 pints (2.4 L) of water in mixing container.
  • Slowly add Sikacrete®-321 FS while continuing to mix.
  • Mechanically mix to a uniform consistency with a low-speed drill (400-600 rpm) and paddle or in appropriate-size mortar mixer or concrete mixer for 3 minutes.
  • Some mixers will take longer than others to achieve the desired slump.

APPLICATION

  • Pre-wet surface to SSD.
  • Ensure good intimate contact with the substrate is achieved. To accomplish this, material should be scrubbed into the substrate or other suitable means should be employed such as vibration of the material.
  • Vibrate form while pouring.
  • Finish as desired.
 

CURING TREATMENT

  • As per ACI recommendations for Portland cement concrete, curing is required.
  • Moist cure with wet burlap and polyethylene, a fine mist of water or Sika® Antisol®-250 W*.
  • 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.
  • For best results, keep surface moist with clean, cool potable water for 1–2 hours after initial set. A Hudson Sprayer is suggested for an even application.

* Pretesting of curing compound is recommended.

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