Product Data Sheet Show all documents

Sika® Microcrete-3000

DUAL SHRINKAGE-COMPENSATED HIGHLY FLOWABLE ECO-FRIENDLY CEMENTITIOUS REPAIR MATERIAL FOR FORMWORK REPAIRS

Sika® Microcrete-3000 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-3000 contains blended cement, silica fume, graded aggregates and additives which give rise to controlled expansion in both the plastic and hardened states.

  • 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
Product Data Sheet Show all documents

Usage

Sika® Microcrete-3000 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-3000 can be applied by gravity pour or mechanical pumping.  

Advantages

  • 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 at temperatures between +10 °C and +25 °C. Keep away from direct sunlight, rain and water.

Maximum Grain Size

6 mm
Technical Information

Compressive Strength

at 1 day

~ 20 N/mm²

at 7 days

~ 70 N/mm²

at 28 days

~ 95 N/mm²

Tensile Strength in Flexure

~9 N/mm² at 28 days

(EN 196-1)

Restrained Shrinkage / Expansion

< 0.2 % at 28 days

(ASTM C1090)

Bleeding

0 % at 3 hours

(ASTM C940)

Baenziger Block

No cracks

Water Absorption

Initial Surface Absorption Test (ISAT) at 28 days

< 0.02 ml/m²/sec

Water Absorption at 28 days

< 0.5 kg.m²h-0.5

Chloride Ion Diffusion Resistance

< 500 coulombs at 28 days

(ASTM C1202)

Application

Application Information

Mixing Ratio

Flowable consistency: 3.0–3.2 L of water/25 kg bag

Fresh mortar density

~2.30 kg/l

Flowability

Flow spread

> 650 mm

Spread time to reach 750 mm

< 15 seconds

L-Box

> 80 %

Pot Life

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

Yield

Sika® Microcrete-3000

2.05 kg

25.0 kg

82 bags x 25 kg

Water

0.25 L

3.0 L

262 L

Volume of mortar

1.0 L

12.17 L

1 m³
Application steps

MIXING

Sika® Microcrete-3000 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 Force-Action mixer is recommended. According to the mixing ratio (3.0–3.2 L / 25 kg bag) place first the water into the clean mixing container and add Sika® Microcrete-3000 slowly while mixing. Ensure a minimum mixing time of 4 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-3000 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-3000may 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.
The formwork can be stripped after at least 3 days.

Upon removal of the formwork, cure the repaired areas immediately with Sika® Antisol® E curing compound if no further treatment is required or Sika® 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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