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Stanrose® Micro Concrete (Concrete Repairing)                                                          

Product Description : Stanrose® Micro Concrete is a ready to use dry powder which requires only addition of clean water at site to produce a free flowing non shrink repair micro concrete. It is composed of good quality cement, properly selected aggregates & additives. It is used & designed for repairing of damaged reinforced concrete elements like columns, beams & structure where the areas are restricted or not easily accessible for proper placement of concrete using vibrator. Stanrose® Micro Concrete has excellent flowability, workability & proper particle size to reach small & congested reinforcement.

Areas of Application :
Repair of damaged reinforced concrete elements like beams, columns, wall, etc. where access is restricted and compaction is not possible.
For jacketing of RCC columns to increase load-taking capacity (strengthening of a vertical members)

Features & Benefits :
Pumpable - Can be pumped or poured into restricted locations.
Flowable - Flowable mortar hence does not require compaction.
Shrinkage Compensation ? Controlled expansion system which compensates for shrinkage and settlement in the plastic state.
Strength - Develops high initial and ultimate compressive strength.
Moisture Resistant - Offers excellent resistance to moisture ingress.
Durability - Makes repaired sections highly durable & compatible to parent concrete.
Thickness build up - Can be applied at 100 mm thickness at one stroke
Early reinstatement -Rapid strength gain helps in early reinstatement & removal of shuttering.

Method of Application :

1. Surface Preparation
Clean the surface and remove loose concrete, dust, oil, paint, grease, waterproof coating, etc.
Expose fully any corroded steel in the repair area and remove all scale and corrosion deposits. Light shot blasting is highly recommended. Apply Stanrose Rust Remover for rust free bars.
Apply Stanrose Epoxy Zinc Primer over the cleaned re-bars and allow it to dry before pouring of Stanrose® Micro Concrete.
Saturate the substrate with water to prevent absorption of water from the mixed material.
For a dry substrate, it should be primed by applying one coat of Stanrose Epoxy Bonding Agent / Stanrose® Concrete Super Bond. Allow the bonding agent to reach tacky condition before pouring of Stanrose® Micro Concrete.

2. Mixing
Use PAN Mixer for mixing of Stanrose® Micro Concrete.
Charge 85-90 % of clean & potable mixing water (3.75 to 4 liters per 25 kg bag) to a PAN Mixer.
Start addition of Micro Concrete powder slowly under continuous mixing. Keep mixing for 2 minutes. Add balance quantity 10 ? 15 % of mixing water & again mix for another 2-3 minutes to form a homogeneous, free flowing, uniform & lump-free mix.

3. Application
Pour or pump the mixed Stanrose® Micro Concrete into a watertight shuttering.
Cure the repaired concrete for minimum 7 days after removing the shuttering or alternatively use Stanrose® Curing Compound for curing.

 Precautions & limitations :
Stanrose® Micro Concrete can applied in section up to 100 mm depth.
For thickness more than 100 mm, addition of pre-calculated aggregates may be required. Consult technical team for more details.
Strictly follow water-powder ratio as specified.
Ensure that the shuttering is 100% watertight.
Ensure full exposure of reinforced steel.
Consult structural engineer if the diameter of rebar is reduced by more than 20% of the original diameter.
Replacement or provision of additional steel shall be done in consultation with structural consultant.

Technical Information :

W/P Ratio 0.15 - 0.16 -----
Compressive strength @ 30o C

ASTM C 109 : 99

15 N/mm2 at 1 day
28 N/mm2 at 3 days
40 N/mm2 at 7 days
55 N/mm2 at 28 days
Flexural Strength @ 30o C ASTM C 580 6 N/mm2 at 28 days
Tensile Strength @ 30o C ASTM C 307 2.5 N/mm2 at 7 days
Expansion   0.45%
Fresh Wet Density   2200 - 2300 kg /m3

Shelf Life & Storage :
Shelf life is six months from the date of manufacturing. Store at cool & dry place in unopened condition.

Health & Safety Precautions :
As with all chemical products, caution should always be exercised.
Protective clothing such as gloves and goggles should be worn (see packaging for specific instructions).
Treat any contact to the skin or eyes with fresh water immediately.
Should any of the products be accidentally swallowed, do not induce vomiting but call for medical assistance immediately.



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