SIKA MICROCRETE – 4 (30 Kg Bag)

Product Description

USES:-

SikaRep Microcrete-4 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.)
• Structrural strengthening of structure by section enlargement

CHARACTERISTICS / ADVANTAGES:-

• No vibration needed
• Easily pumpable
• Easy to mix and apply
• Excellent flow characteristics
• Rapid strength development
• High ultimate strengths
• Impact resistant
• Non-corrosive
• Non-toxic
• Iron and chloride free Dense and non-shrink concrete created by dual stage expansion
• Good bonding with existing concrete Adjustable consistency by controlling the water within the recommended limit

APPROVALS / STANDARDS:-

• Test Certificate No. C1/0000227197, Shriram Institute for Industrial Research, dated 07-09-2020
• Test Report, IIT Bombay, dated March 10, 2015
• Consultancy Report, IIT Delhi, 2014

PRODUCT INFORMATION:-

Chemical base:-

Portland cement, selected fillers and aggregates, special additives

Packaging:-

30 kg bag

Shelf life :-

6 months from date of production

Storage conditions :-

The product must be stored properly in undamaged and unopened, original sealed packaging, in dry conditions at temperatures between +5 °C and +35 °C. Protect from moisture, direct sunlight and frost. 

APPLICATION INFORMATION:-

Mixing ratio:-

Water : Powder = 0.14 to 0.16 (by weight) 4.2 L to 4.8 L water per 30 kg bag, dependent on the desired flow

Fresh mortar density:-

(2.15 ± 0.15) kg/L (water : powder = 0.15)

Consumption;-

~1900 kg of powder per m3 of concrete (water : powder = 0.15)

Layer thickness:-

Minimum       25 mm per pour

Maximum      100 mm per pour

Higher layer thickness can be done with addition of aggregates. Contact Sika Technical Services for additional information.

Ambient air temperature:-

+5 °C min. / +40 °C max.

Substrate temperature:-

+5 °C min. / +40 °C max.

Pot life:-

~20 minutes (water : powder = 0.15, +30 °C) 

APPLICATION INSTRUCTIONS;-

EQUIPMENT;-

SikaRep Microcrete-4 can be mixed both in paddle type and slow speed (max. 500 rpm) grouting mixer or drum type concrete mixer.

MIXING:-

1. Place about 80–90 % of the premeasured clean water into a clean mixer and gradually add the whole bag of SikaRep® Microcrete-4 into it while continuously mixing.
2. Add the remaining water and additional clean 5–10 mm aggregates (if needed as per design) until the desired consistency is obtained.
3.  Mixing time should be minimum 3 minutes.

IMPORTANT Concrete can also be produced with addition of 10 mm down properly graded silt-free aggregate in proportion of 2 : 1 (SikaRep Microcrete-4 : coarse aggregate) by weight.

IMPORTANT Do not mix more material, which cannot be used within pot life.

IMPORTANT Do not add extra water.

IMPORTANT Mix only full bags for best results.

APPLICATION:-

Strictly follow installation procedures as defined in method statements, application manuals and working instructions which must always be adjusted to the actual site conditions.

IMPORTANT;-

Formwork

Ensure formwork is secure and watertight to prevent movement and leaking during placing and curing.

IMPORTANT:-

Working in thick sections

Do not pour more than 100 mm of layer thickness without addition of aggregates.

Small localised repairs

Small volume mixing 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 microconcrete 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 maintained for uninterrupted concrete flow. Formwork must be firmly placed and kept watertight. When placing microconcrete 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 microconcrete. Ensure proper air displacement when pouring. In large areas, microconcrete 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.

Hot weather working

Consider storing bags in a cool environment and using cold water to assist with controlling the exothermic reaction to reduce cracking and maintaining physical properties.

CURING TREATMENT;-

Formwork must remain in place for at least 3 days. Upon removal of the formwork, cure the exposed surfaces immediately with Sika Antisol 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 removed mechanically.

CLEANING OF TOOLS;-

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

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