Product Data Sheet
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Sika® Microcrete-2000

Dual shrinkage-compensated, flowing, cementitious repair material for formwork repairs

Sika® Microcrete-2000 is a dual shrinkage-compensated pre-bagged flowing micro 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. With its high silica fume content and combination of blended cement, a highly dense, impervious and hence durable repair mortar is obtained. Sika® Microcrete-2000 contains blended cement, silica fume, fibres, 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
  • High ultimate strengths
  • Very dense and durable
  • Non-toxic and non-corrosive
  • Chloride and iron-free
  • Impact and vibration resistant
  • Gaseous expansion system to compensate plastic shrinkage
  • Controlled crystalline expansion system to compensate shrinkage in the hardened state
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Product Data Sheet
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Usage

Sika® Microcrete-2000 is suitable for structural repairs to marine structures, bridges, columns, etc. It is also conducive for use in the following repair works where single placing is in excess of 25 mm thickness:
  • Bridge columns and beams
  • Jetty piles
  • Concrete piling
  • Spillways
  • Dams
  • Grouting applications
Sika® Microcrete-2000 can be applied by gravity pour or mechanical pumping.  

Advantages

  • Pre-bagged at the factory / consistent quality
  • Easy to mix and apply
  • Good flow characteristics
  • Suitable for large repairs
  • High ultimate strengths
  • Very dense and durable
  • Non-toxic and non-corrosive
  • Chloride and iron-free
  • Impact and vibration resistant
  • Gaseous expansion system to compensate plastic shrinkage
  • Controlled crystalline expansion system to compensate shrinkage in the hardened state

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. Keep away from direct sunlight, water and rain.

Maximum Grain Size

6 mm
Technical Information

Compressive Strength

at 7 days

> 40 N/mm²

at 28 days

> 60 N/mm²

* with 50 mm cubes and kept under restraint for 24 hours

Tensile Strength in Flexure

> 7 N/mm² at 28 days

(ASTM C348)

Restrained Shrinkage / Expansion

+0.20 % at 28 days

(ASTM C1090)

Reaction to Fire

Fire rating, Classified A1
Sika® Microcrete-2000 will not contribute to any state of fire including fully developed fire.

(EN 13501-1)

Chloride Ion Diffusion Resistance

at 28 days

< 500 coulombs

Shear Adhesion

> 15 N/mm² at 28 days

(ASTM C1042)

Water Absorption

Initial Surface Absorption Test (ISAT) at 28 days

< 0.02 ml/m²/sec

Water Absorption at 28 days

< 2 %

Bleeding

0 % at 3 hours

(ASTM C940)

Application

Application Information

Fresh Mortar Density

~2.25 kg/l

Flowability

Flow trough

1 000 mm

Spread time to reach 750 mm

< 10 seconds

Mixing Ratio

Flowable consistency

3.2–3.4 L of water per 25 kg bag

Pot Life

40 minutes min. (at +30 °C)
Consumption

Yield

Based on 0.128 : 1 = water : powder ratio

2.04 kg

25.0 kg

82 bag × 25 kg

Water

0.26 L

3.2 L

262 L

Mortar

1.0 L

12.26 L

1 m³
Application steps

MIXING

Sika® Microcrete-2000 should be mechanically mixed in a clean container using a heavy-duty drill and paddle or a forced-action mixer. According to the mixing ratio place first the water into the clean mixing container and add Sika® Microcrete-2000 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. To obtain maximum benefit of the expansion, place the mortar within 20 minutes after mixing. Pour or pump the mixed material through a flexible tube (minimum 50 mm ø) 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-2000 over a large area, it is important to maintain continuous flow throughout. Work sequence must be properly organised to ensure uninterrupted flow. In such large areas, Sika® Microcrete-2000 may be pumped using a heavy-duty piston or screw feed pump.

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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