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SikaPaver®-621 AE

COMPACTION AID FOR SEMI-DRY CONCRETE

SikaPaver®-621 AE is a filling and compaction aid which has been designed to eliminate the stickiness of semi-dry concretes at elevated water-cement-ratios.
The resulting granular concrete leads to an even mould filling and less quality fluctuations while ensuring the targeted concrete compaction. Suitable for use in hot and tropical climatic conditions.

SikaPaver®-621 AE has been designed especially for the application in semi-dry / no-slump concrete with high moisture contents and causes:
  •  Better dispersion and wetting of cement, additives and pigments
  •  Reduced friction between cement and aggregates
  •  Retaining of parts of the water, which reduces the stickiness of the concrete.
  This leads in fresh semi-dry concrete to the following advantages:
  • Granular mould-filling properties, despite high water contents
  • Even concrete distribution across the mould (horizontally and vertically)
  • Stronger compactability, which allows, for example, achieving shorter cycle time or higher concrete densities
  • Increased green strength (shape keeping) after immediate de-molding

In hardened concrete, SikaPaver®-621 AE hence causes:
  • Higher concrete density and strength
  • Smoother and more homogenious concrete surfaces and flanks
  • Better durability
  • Less quality variations and consequently less second grade products
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Usage

  • Concrete Pavers
  • Masonry Blocks
  • Roof Tiles
  • Kerbstones
  • Landscaping elements
  • Screed concrete

Advantages

SikaPaver®-621 AE has been designed especially for the application in semi-dry / no-slump concrete with high moisture contents and causes:
  •  Better dispersion and wetting of cement, additives and pigments
  •  Reduced friction between cement and aggregates
  •  Retaining of parts of the water, which reduces the stickiness of the concrete.
  This leads in fresh semi-dry concrete to the following advantages:
  • Granular mould-filling properties, despite high water contents
  • Even concrete distribution across the mould (horizontally and vertically)
  • Stronger compactability, which allows, for example, achieving shorter cycle time or higher concrete densities
  • Increased green strength (shape keeping) after immediate de-molding

In hardened concrete, SikaPaver®-621 AE hence causes:
  • Higher concrete density and strength
  • Smoother and more homogenious concrete surfaces and flanks
  • Better durability
  • Less quality variations and consequently less second grade products

Packaging

1000 L flowbin

Colour

Clear to light brown liquid

Product Details

Product Information

Composition

Blend of surfactants and modified polycarboxylates

Shelf life

12 months from date of production if stored properly

Storage conditions

Store in undamaged, unopened, original sealed packaging in dry conditions at temperatures between +5°C and +50°C. Mix well before using.

Density

~1.08 kg/l (+25°C)

Total chloride ion content

Nil

(EN 934-2)
Technical Information

Concreting guidance

The standard rules of good concreting practice for production and placing must be observed when using SikaPaver®-621 AE in concrete. Refer to relevant standards.

Application

Application Information

Dispensing

SikaPaver®-621 AE shall be introduced at the end of the mixing process to ensure its uniform distribution. The necessary mixing time after the admixture dosage depends on the individual mixer.

Compatibility

SikaPaver®-621 AE may be combined with all types of Portland cement, concretes containing pozzolanic materials such as; GGBS, PFA , micro-silica
and the following Sika® products:
▪ SikaFume®
▪ SikaFiber®
▪ Sika® Stabilizer
▪ SikaControl®
We recommend to perform trial mixes to establish the required performance when combined with the above products. Please consult our Sika
Technical Department.
Consumption

Recommended dosage

Semi-dry concrete: 0.4 - 1.5 % by weight of binder
Dosages outside of this range can be used depending on the mix design, raw materials, climatic conditions and concrete requirements. Trial mixes must be performed to establish the exact dosage rate required.

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