Product Data Sheet Show all documents

SikaRapid®-1

Hardening accelerator

SikaRapid®-1 is a new generation hardening accelerator for concrete and mortar. It increases the early strengths of concrete without negatively influencing final strengths. SikaRapid®-1 fulfills all the requirements for a concrete admixture based on active agent group FS according to guideline A of FSHBZ and SIA specs. 162 (1989) without any undesired side effects.

SikaRapid®-1 is normally used in combination with a superplasticiser. The addition of SikaRapid®-1 does not change the positive properties (e.g. fluidifying, stiffening behaviour etc.) of the superplaticiser. Depending on the dosage of SikaRapid®-1 an increase in early strengths during the first 24 hours of up to 100% in comparison with normal Sikament concrete can be achieved. Depending on the brand of OPC/HPC used and the temperature of the fresh concrete, the effect may vary slightly.
Product Data Sheet Show all documents

Usage

SikaRapid®-1 is being used at RMC plants at concrete temperatures of +5 °C to +25 °C, where extremely high requirements for early strengths of between 6-24 hours have to be met.
SikaRapid®-1 does not contain any chlorides and can therefore be used without any reservations for reinforced as well as prestressed concrete. However, it should not be used in combination with expanding or shrinkage compensating admixtures.  

Advantages

SikaRapid®-1 is normally used in combination with a superplasticiser. The addition of SikaRapid®-1 does not change the positive properties (e.g. fluidifying, stiffening behaviour etc.) of the superplaticiser. Depending on the dosage of SikaRapid®-1 an increase in early strengths during the first 24 hours of up to 100% in comparison with normal Sikament concrete can be achieved. Depending on the brand of OPC/HPC used and the temperature of the fresh concrete, the effect may vary slightly.

Packaging

5 / 25 / 200 L drums (non-returnable)

Colour

Transparent/light yellow liquid.

Product Details

Product Information

Chemical base

Mixture of organic & inorganic complexing agents

Shelf life

15 months from date of production if stored properly in original unopened packing

Storage conditions

Store protected from direct sunshine at temperatures between +5 °C and +35 °C

Density

1.17–1.19

pH-Value

8.5±1.0
Technical Information

Concreting Guidance

The standard rules of good concrete production and placing must also be observed when SikaRapid®-1 is being used. Optimal curing of the fresh concrete is a must, especially at low temperatures. According to SIA Standard 162 (1989), the temperature of fresh concrete during placing may not be lower than +5 °C (Art. 6 07 4 to 6 07 7).
In case of danger of frost, winter precautions must be implemented and maintained until concrete has developed 10 N/mm2 (freeze-resistance)

Specific Advice

Frozen SikaRapid®-1:
Frozen SikaRapid®-1 may be used after being thawed slowly at room temperatures and intensive stirring.
Combinations:
SikaRapid®-1 may be sensibly combined with any non retarded Sika plasticizer or superplasticiser. Tests must be carried out in combination with such products.
SikaRapid®-1 should not be combined with expansion promoting admixtures such as Intraplast or Intracrete.
For important projects, please consult our Technical Services.

Application

Application Information

DISPENSING

SikaRapid®-1 is either mixed with the gauging water or added simultaneously with the gauging water into the concrete mixer.

It is also possible to add SikaRapid®-1 to the basic concrete carried in a transit mixer at the place of discharge. In this case, an additional mixing time of 1 minute per m3 of concrete must be observed. Prior to its discharge the concrete is to be checked visually for uniform consistency.
Consumption

Recommended Dosage

Depending on desired acceleration effect 0.4–1.3 % by weight of cement

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