Product Data Sheet Safety Data Sheet Show all documents

SikaControl® NS

SHRINKAGE REDUCING AND COMPENSATING ADMIXTURE

SikaControl® NS is a shrinkage-reducing and compensating admixture. The effect of the dual-mechanism to control shrinkage allows to produce high-performance concrete with greatly reduced potential for drying shrinkage, cracking and curling.

  • Dual-mechanism control effect on the concrete shrinkage giving predictible and reproducible results
  • Controled expansion mechanism for producing a volume stable concrete
  • Greatly reduced cracking potential related to autogenous shrinkage
  • Reduces curling and allows for increased joint spacing
  • Reduces porosity and permeability, resulting in improved concrete durability
  • Reduces contraction forces induced from drying shrinkage thus minimizing risks of long-term and unsollicited cracks formation
Product Data Sheet Safety Data Sheet Show all documents

Usage

SikaControl® NS can be used in any type of cast-in-place or precast/prestressed concrete, grout, mortar or any other cementitious mixes. Some of the applications of SikaControl® NS may include:
  • Concrete floors, to compensate for drying shrinkage cracking, control curling and increased joint spacing
  • In thin bonded topping slabs, to minimize the difference in shrinkage between the new topping and the existing substrate
  • In concrete elements which are restrained against shrinkage
  • For bridge decks and parking structures
  • For mass concrete structures such as mat foundations, dams and other structures requiring large thicknesses of concrete exceeding 1 m (3 ft)
  • For durable concrete in marine environments
  • For watertight concrete in reservoirs, sewage treatment plants, and dams
 

Advantages

  • Dual-mechanism control effect on the concrete shrinkage giving predictible and reproducible results
  • Controled expansion mechanism for producing a volume stable concrete
  • Greatly reduced cracking potential related to autogenous shrinkage
  • Reduces curling and allows for increased joint spacing
  • Reduces porosity and permeability, resulting in improved concrete durability
  • Reduces contraction forces induced from drying shrinkage thus minimizing risks of long-term and unsollicited cracks formation

Packaging

11.34 kg (25 lb) dissolvable bag and 907 kg (2000 lb) FIBC*

* Flexible Intermediate Bulk Container

Colour

Powder / Off-white to light brown

Product Details

Sustainability / Certifications / Approvals

APPROVALS / CERTIFICATES

Meets the requirements of the following standards:
- ASTM C494, Type S
- NSF/ANSI 61
Product Information

Shelf Life

1 year when stored in dry warehouse conditions.

Storage Conditions

Store in dry environment; exposed, unprotected material will absorb moisture and carbon dioxide from the air resulting in reduced product performance.

Specific Gravity

Approx 2.71

Application

Application Information

Compatibility

SikaControl® NS is compatible with commonly-used SCMs and other Sika® admixtures.

Mixing

Mixing / Dispensing:

SikaControl® NS can be added to the concrete either along with the other powder components or after all the other ingredients are added to the concrete mixer or truck. If it is added after all the other ingredients, adequate mixing should be ensured. The 11.34 kg (25 lb) dissolvable bags are designed to disintegrate through a combination of wetting and grinding of the paper during concrete mixing.

Limitations:

  • Do not introduce repulpable bags into concrete mixes with low water cementitious ratios and smaller size aggregates as these mixes may not develop sufficient mixing energy to fully repulp the bags. Always determine repulpability of bags by pretesting mix designs and batch sequence.
  • Do not premix with other admixtures.

Curing:

The performance of SikaControl® NS is dependent on proper curing practices. To maximize the shrinkage reducing and compensating effects, it is recommended to follow proper curing practices by wet cure only as per ACI 308 recommendations.
Consumption

Recommended Dosage

The recommended dosage range for SikaControl® NS is from 2 % to 7 % by weight of cement mass for concrete, mortars or grouts. SikaControl® NS, at a 5 % dosage rate, has shown significant reduction in shrinkage cracking in independent lab testing.

When trial mixes are performed for mix approval, ensure that all materials used are representative of the materials to be used during actual production. For more information on the optimal dosage regarding the mix design, contact Sika Canada.

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