SikaRep® Microcrete-4

• 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

Portland cement, selected fillers and aggregates, special additives

6 months from date of production

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.

Values measured at water : powder = 0.15, cube size 70.6 mm, curing temperature +30 °C

Values measured at water : powder = 0.15, curing temperature +30 °C

No shrinkage after initial setting

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

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

+5 °C min. / +40 °C max.

+5 °C min. / +40 °C max.

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

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

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

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.
• Do not mix more material, which cannot be used within pot life.
• Do not add extra water. 
• Mix only full bags for best results.

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

Formwork

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

Working in thick sections

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

Small localized 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 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 maintained 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 organized to ensure an uninterrupted flow of micro-concrete. Ensure proper air displacement when pouring. 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.

Cold weather working

Consider storing bags in a warm environment and using warm water to assist with achieving strength gain and maintaining physical properties.

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.

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.

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