- Repairs to reinforced or pre-stressed beams or columns.
- All types of structural repair which can be applied by trowel.
- Repairs in marine environments.
- To fill pinholes prior to over coating for general reprofiling.
Concrete Repair Mortar CRM-300
Description
Stucco® CRM-300 is ready to use economical single component polymer modified repair mortar containing fibres and silica fume. CRM-300 contains specially selected material to provide a fine, smooth repair material.
Uses
Composition
CRM 300 consists of selected cements, processed sand, Fibre and chemical additives.
Advantages
- Contains fibres to reduce micro cracking and improves durability
- Easy to apply. Excellent workability.
- Water & weatherproof.
- Excellent adhesion and mechanical strength.
- Contains no chlorides or salts that may cause corrosion.
- Non sagging
- Excellent low permeability- Gives excellent resistance to attack by aggressive elements.
Technical Data
| Appearance | Grey Powder |
| Size of the aggregate | < 3.00 mm |
| Fresh Weight Density | Dry: 2.01g/ltr wet: 2.1 g/ltr. |
| Water Absorption ISAT | 10 minutes < 0.007 ml/m2/sec |
| Approximate yield / coverage | 580 ltrs/ton, 29 m2/ton @ 20 mm thickness |
| Coverage | 1m2/Bag @13. 5mm thickness |
| Working time | Approx. 30- 45 minutes |
| Curing | Minimum 3 days (3-4 times daily) by potable water |
| Compressive strength | >70 N/mm2 after 28 days |
| Flexural strength | 5.5 N/mm2 at 28 days |
| Bond Strength to Concrete | 1.50 to 2.0 N/mm2 at 28 days |
| Shelf Life | 12 months from date of Manufacture |
| Application Standards | BS: 6319 Part 7: 85, BS 6319, Part 3:85, BS: 1881, part 116 and 207, BS: 4551: 80, BS 1881: Part 208:1996 |
Method of Application
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Surface Prearation
- Surface preparation is important. Correct surface preparation helps to achieve proper bonding between substrate and new floor.
- All surfaces must be clean and structurally sound. The Substrate should be cleaned using a brush to remove any dust or loose particles.
- The surface of the concrete must be mechanically scarified or must be hacked to at least 70-80% of the total concrete surface. The surface must be divided in equals panels of 2*3 meter to avoid shrinkage cracks.
- Pre-wetting on concrete at least 5-6 hour before is a must and excess water should be allowed to dry before the application begun.
- Mixing CRM 300 is simply mixed with water to yield a stiff easily workable compound. The quantity of water depends on the desired consistency but as a guide we recommend 16-17% by weight of CRM 300. Mix with a paddle mixer or trowel for at least 3 minutes to ensure a homogeneous lump free material is achieved. Do not remix the product after losing workability by the addition of more water.
- Priming Priming is not normally required. Surface to receive CRM 300 should be well saturated with water first.
- Application
- Mix and apply CRM 300 to the surface after Anticorrosion treatment if required.
- Apply the mixed paste/mortar with a steel trowel. It should be allowed to partly set before smoothing.
- If a very smooth finish is required; a small amount of water may be sprayed on to the surface prior to final smoothing.
- Curing CRM 300 should be cured with clean water for at least 72 hours (3 days) by spraying twice a day.
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Precautions
- Newly installed plaster should be protected from hot, dry winds and excessive ventilation.
- Do not apply if raining. Protect from rain for 48 hrs after application. Hard or lumpy material must not be used
- The plaster has to be allowed to dry out completely devoid of any moisture, before applying any kind of stucco finish, paint or wall paper
- Storage CRM-300 must be protected from moisture and direct sunlight. Store off the ground in a cool and dry place.