Product Data Sheet
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Sika® Microcrete®-217 MYF

Powder power-pack for producing high performance micro-concrete

Sika® Microcrete®-217 MYF contains all the necessary active ingredients to produce a free flowing, shrinkage compensated, high performance micro-concrete when mixed with clean, hard, 5–10 mm concrete aggregrates and water.

  • Easy to mix and apply
  • Good flow characteristics
  • Rapid strength development
  • High ultimate strengths
  • Impact resistant
  • Non-corrosive
  • Non-toxic
  • Iron and chloride free
  • Dense and non-shrink (2 step expansion)
    • Gaseous expansion in plastic stage
    • Crystalline expansion in hardened stage
  • Extended working time
  • Good pumping properties
All properties must be checked with trials using selected additional aggregates
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Product Data Sheet
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Usage

Sika® Microcrete®-217 MYF is suitable for producing high performance micro-concrete for deep repairs to all concrete structures such as:
  • Highway bridges and culverts
  • Whafts and jetties
  • Tunnels and mines
  • Dams and reservoirs
  • Car parks and basements
  • Power stations
  • Sewerage and water treatment structures
  • Anywhere where localised deep repair is required
  • Anywhere additional thickness is required (column and beam jacketing, etc.)
 

Advantages

  • Easy to mix and apply
  • Good flow characteristics
  • Rapid strength development
  • High ultimate strengths
  • Impact resistant
  • Non-corrosive
  • Non-toxic
  • Iron and chloride free
  • Dense and non-shrink (2 step expansion)
    • Gaseous expansion in plastic stage
    • Crystalline expansion in hardened stage
  • Extended working time
  • Good pumping properties
All properties must be checked with trials using selected additional aggregates

Packaging

25 kg bag

Colour

Grey powder

Product Details

Product Information

Shelf Life

6 months from date of production

Storage Conditions

Store in original, unopened and undamaged packaging in dry conditions at temperatures between +5 °C and +30 °C. Protect from direct sunlight, rain and water.

Maximum Grain Size

1.2 mm
Technical Information

Compressive Strength

Flowable Workability (without adding extra aggregates)

24 hours

> 25 N/mm²

7 days

> 50 N/mm²

28 days

> 65 N/mm²

Expansion

≤ 1.5 %

(modified ASTM C940)

Bleeding

0 % at 24 hours

Reaction to Fire

Classified A1 - will not contribute in any state of the fire including the full developed fire

(EN 13501-1)

Application

Application Information

Mixing Ratio

Flowable consistency

4.0–4.4 L water per 25 kg of Sika® Microcrete®-217 MYF + 16.7 kg aggregates

Pourable consistancy

4.0–4.4 L water per 25 kg of Sika® Microcrete®-217 MYF + 25 kg aggregates

Note: The aggregates shall be pre-wetted to saturated-surface-dry conditions (SSD) before mixing with Sika® Microcrete®-217 MYF.

Fresh Mortar Density

2.35–2.45 kg/l (depending on workability and volume of added aggregate)

Layer Thickness

50 mm min. / 150 mm max. per pour

Flowability

1–3 seconds (LBox)

Site trials are recommended to determine the flowability of Sika® Microcrete®-217 MYF when added with the actual aggregates used at site. If required, the quantity of aggregates shall be adjusted (reduced) to meet the flowability requirement.

Ambient Air Temperature

+10 °C min. / +30 °C max.

Substrate Temperature

+10 °C min. / +30 °C max.

Setting Time

3–5 hours
Application steps

MIXING

Place about 80–90 % of the premeasured clean water into a clean mixer and gradually add the whole bag of Sika® Microcrete®-217 MYF into it while continously mixing. Add the remaining water and additional clean 5–10 mm aggregates until the desired consistency is obtained.

Mix for 2–3 minutes with forced action mixer until homogeneous.

APPLICATION

Small localised repairs

Small volume mixing (1 Sika® Microcrete®-217 MYF + aggregates) may carried out with a suitable low-speed (500 rpm) drill and mixing paddle. After mixing, stir lightly with a spatula for a few seconds to release any entrapped air. The micro-concrete is then poured immediately into the prepared formwork.

Large repairs

When carrying out large scale repairs or column / beam jacketing, ensure sufficient pressure head is maintaintained for uninterrupted concrete flow. Formwork must be firmly placed and kept watertight. When placing micro-concrete over large area, it is important to maintain a continuous flow throughout the process. Work sequence and equipment must be properly organised to ensure an uninterrupted flow of grout. In large areas, micro-concrete may be mixed and pumped using heavy duty screw feed and piston pumps. Equipment suitability should be tested and checked prior to actual grouting works.

CURING TREATMENT

Formwork must be remain in place for at least 3 days. Upon removal of the formwork, cure the exposed surfaces immediately with Antisol®-E curing compound or use other approved curing methods.

CLEANING OF TOOLS

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

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