Hardening Accelerators - Rapid - Sika® Rapid-1

Strength/Hardening Accelerating Admixture

Sika® Rapid-1 is a non-chloride strength/hardening accelerator formulated to increase the early strength of concrete without affecting the initial workability. Sika® Rapid-1 meets the requirements of ASTM C-494, Type C accelerating admixture.

High Early Strength Concrete: Sika® Rapid-1 delivers excellent results in normal and
hot weather conditions where very high early strengths are required.

• Benefits
  • Early stripping and re-use of forms.
  • Faster finishing operations on flatwork surfaces.
  • Earlier post-tensioning.
  • Effective with Type I/II/III cements.
  • Enhanced concrete sustainability through cement reduction and lower carbon footprint (eCO²).

Precast Concrete: Sika® Rapid-1 delivers excellent results for precast concrete when high early strengths are required. Curing times are significantly reduced while concrete quality is improved.

• Benefits
  • Use as a replacement for steam curing to save energy costs.
  • Increase early strengths and allow faster rotation of molds to increase production per day.
  • Use as a replacement for Type III cement.
  • Enhanced concrete sustainability through cement reduction and lower carbon footprint (eCO²).

Cold weather concreting: Sika® Rapid-1 is an effective hardening accelerator where high early strength concrete is desired and the use of calcium chloride is prohibited.

• Benefits
  • Insulation and heating costs for curing time can be reduced.
  • Earlier stripping and reuse of forms increases labor productivity.
  • Accelerated strength gain allows earlier structural use and speeds completion time.
  • Enhanced concrete sustainability through cement reduction and lower carbon footprint (eCO²).

Sika® Rapid-1 does not contain calcium chloride or any other intentionally added chlorides and will not initiate or promote the corrosion of reinforcing steel present in the concrete. Placing concrete in freezing conditions: When used at Sika recommended dosage rates, Sika® Rapid-1 may reduce the need for cold weather concreting practices as specified in ACI 306-Standard Specification for Cold Weather Concreting. Field evaluations should be carried out when concrete is to be placed in freezing conditions to determine the minimum ambient and concrete temperatures required, and the optimum dosage for the desired setting time and strength performance. Sika strongly recommends that appropriate sound curing practices be used to protect fresh concrete from excessive heat loss in extreme weather conditions.

Usage

Sika® Rapid-1 is designed for the use in Ready Mix, Precast and Dry cast concrete applications. The applications where Sika® Rapid-1 can provide substantial benefits are: Concrete requiring increased early age strength development:

• Precast/prestressed concrete.
• Cold weather construction.
• Fast-track construction.
• Bridge overlays.

Sustainable construction with reduced carbon footprint (embodied CO²) of concrete through cement reduction.

Advantages

High Early Strength Concrete: Sika® Rapid-1 delivers excellent results in normal and
hot weather conditions where very high early strengths are required.

• Benefits
  • Early stripping and re-use of forms.
  • Faster finishing operations on flatwork surfaces.
  • Earlier post-tensioning.
  • Effective with Type I/II/III cements.
  • Enhanced concrete sustainability through cement reduction and lower carbon footprint (eCO²).

Precast Concrete: Sika® Rapid-1 delivers excellent results for precast concrete when high early strengths are required. Curing times are significantly reduced while concrete quality is improved.

• Benefits
  • Use as a replacement for steam curing to save energy costs.
  • Increase early strengths and allow faster rotation of molds to increase production per day.
  • Use as a replacement for Type III cement.
  • Enhanced concrete sustainability through cement reduction and lower carbon footprint (eCO²).

Cold weather concreting: Sika® Rapid-1 is an effective hardening accelerator where high early strength concrete is desired and the use of calcium chloride is prohibited.

• Benefits
  • Insulation and heating costs for curing time can be reduced.
  • Earlier stripping and reuse of forms increases labor productivity.
  • Accelerated strength gain allows earlier structural use and speeds completion time.
  • Enhanced concrete sustainability through cement reduction and lower carbon footprint (eCO²).

Sika® Rapid-1 does not contain calcium chloride or any other intentionally added chlorides and will not initiate or promote the corrosion of reinforcing steel present in the concrete. Placing concrete in freezing conditions: When used at Sika recommended dosage rates, Sika® Rapid-1 may reduce the need for cold weather concreting practices as specified in ACI 306-Standard Specification for Cold Weather Concreting. Field evaluations should be carried out when concrete is to be placed in freezing conditions to determine the minimum ambient and concrete temperatures required, and the optimum dosage for the desired setting time and strength performance. Sika strongly recommends that appropriate sound curing practices be used to protect fresh concrete from excessive heat loss in extreme weather conditions.

Packaging

Sika® Rapid-1 is available in 55 gallon drums (208 liters), 275 gallon totes (1040 liters) and bulk delivery.

Color

Reddish/Violet liquid. Color may change upon continuous exposure to UV light.

Product Details

Product Information

Shelf Life

Shelf life when stored in dry warehouse conditions between 50 °F and 80 °F (10-27 °C) is 1 year.

Storage Conditions

Sika® Rapid-1 should be stored at above 40 °F (5 °C). If frozen, thaw and agitate thoroughly to return to normal state.

Specific gravity

Approx. 1.17

Application

Application Information

Mixing

Add correct amount of Sika® Rapid-1 at the concrete plant or into ready mix truck at the job site. The admixture may be added manually or by automated dispenser directly into the sand or into the water line at the batch plant. When used in combination with other admixtures care must be taken to dispense each admixture separately into the mix. Do not mix with dry cement.

Use With Other Admixtures: Sika® Rapid-1 performs well in combination with other admixtures such as non-retarding water reducers, high range water reducers and air entraining agents. Do not mix Sika® Rapid-1 with expansion agents or shrinkage compensating agents.

MIXING

Sika® Rapid-1is added to the gauging water or added with it into the concrete mixer.
Sika® Rapid-1 may also be added into the ready- mix truck on site. When added on site the truck mixer shall rotate its drums at maximum revolutions for at least 1 minute per m³ concrete and a minimum of 5 minutes to achieve a uniform mix. The concrete has to be visually checked for uniform consistence before discharging.

Consumption

Recommended Dosage

To promote high early strength Sika® Rapid-1 may be used at the rate of 8-48 fl.oz. per 100 lbs. (520- 3120 ml/100 kg) cement. When used to protect concrete from freezing, dosage will vary with different brands of cement and ambient temperatures and higher dosages may be necessary. Adjust water content accordingly when used at dosage of 16 fl.oz/100 (1040 ml/100 kg) cementitious or higher. Sika recommends that trial mixes be performed to determine the most efficient dosage.

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