Product Data Sheet
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Sika® Microcrete®-218

Self-compacting concrete for formwork repairs

Sika® Microcrete®-218 is a pre-bagged self-compacting concrete. It has very good flow properties and has been specifically developed to reduce heat generation. As such, large volume repairs may be performed without addition of aggregates.  Sika® Microcrete®-218 contains blended cement, graded aggregates and additives which give rise to controlled expansion in both the plastic and hardened states.

  • Pre-bagged at the factory / consistent quality
  • Easy to mix and apply
  • Good flow characteristics
  • Suitable for large repairs
  • Non-toxic and non-corrosive
  • Impact and vibration resistant
  • Placing thickness up to 300 mm
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Product Data Sheet
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Usage

Sika® Microcrete®-218 is suitable for structural repairs to bridges, columns, etc. It is also conducive for use in the following repair works where single placing is in excess of 50 mm thickness:
  • Bridge columns and beams
  • Concrete piling
  • Dams
  • Grouting applications
Sika® Microcrete®-218 can be applied by gravity pour.  

Advantages

  • Pre-bagged at the factory / consistent quality
  • Easy to mix and apply
  • Good flow characteristics
  • Suitable for large repairs
  • Non-toxic and non-corrosive
  • Impact and vibration resistant
  • Placing thickness up to 300 mm

Packaging

25 kg bag

Colour

Concrete grey powder

Product Details

Product Information

Shelf Life

6 months from the date of production

Storage Conditions

Store properly in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +10 °C and +30 °C. Keep away from direct sunlight, rain and water.

Maximum Grain Size

6 mm
Technical Information

Compressive Strength

at 7 days

~55 N/mm²

at 28 days

~75 N/mm²

Modulus of Elasticity in Compression

at 28 days

~35000 N/mm²

Tensile Strength in Flexure

at 28 days

~8 N/mm²

Tensile Adhesion Strength

at 28 days

> 2 N/mm²

Capillary Absorption

~0.07 kg/m².h0.5

(EN 13057:2002)

Chloride Ion Diffusion Resistance

at 28 days

< 1 000 coulombs

Application

Application Information

Mixing Ratio

3.0–3.2 L of water per 25 kg bag

Fresh Mortar Density

~2.2 kg/l

Flowability

Flow Spread

> 650 mm

L-Box

> 80%

Ambient Air Temperature

Above +20 °C

Substrate Temperature

Above +20 °C

Pot Life

30 minutes min. (at +30 °C)
Application steps

MIXING

Sika® Microcrete®-218 should be mechanically mixed in a clean container using a heavy-duty drill and paddle or a forced-action mixer. Collomix mixer with mixing paddle MK or any other equivalent Forced-Action mixed is recommended. According to the mixing ratio place first the water into the clean mixing container and add Sika® Microcrete®-218 slowly while mixing. Ensure a minimum mixing time of 3 minutes. During mixing, the mortar will initially have a visibly stiff appearance, but upon continuous stirring, it will become free-flowing. Hence, do not add more water than the recommended maximum mixing ratio. The speed of the mixer should not exceed 500 rpm to minimise air entrainment.

APPLICATION

After mixing, stir lightly with a spatula for a few seconds to release any entrapped air. Pour the free flowing mortar immediately into the prepared formwork. Place the mortar within 40 minutes after mixing. Pour the mixed material to the lowest point in the formwork. Care shall be taken not to entrap any air during the repair operation as this may affect the bonding properties of the repair. When placing Sika® Microcrete®-218 over a large area, it is important to maintain continuous flow throughout. Work sequence must be properly organised to ensure uninterrupted flow.

CURING TREATMENT

Exposed surfaces should be kept to a minimum and cured with appropriate curing methods as soon as the mortar has hardened. The formwork can be stripped after at least 3 days. Upon removal of the formwork, cure the repaired areas immediately with Antisol® E curing compound if no further treatment is required or Antisol® A curing compound if a protective coating is to be applied (consult our Technical Service Department) – refer to the respective Product Data Sheet for application rate and method.

CLEANING OF TOOLS

Clean all tools and application equipment with water immediately after use. Hardened or cured material can only be mechanically removed.

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