SpECbuild MC500
One-component high fluidity micro-concrete for repairs.
SpECbuild MC500 is a one-component, pre-packed micro-concrete designed for easy application in concrete repairs. Upon adding clean water, it quickly transforms into a highly fluid material suitable for reinstating large concrete sections and addressing intricate repair situations. This product effectively minimizes shrinkage while ensuring excellent bond strength with properly prepared substrates.
With a user-friendly formulation, SpECbuild MC500 enhances the efficiency and durability of concrete repairs in various construction projects.
With a user-friendly formulation, SpECbuild MC500 enhances the efficiency and durability of concrete repairs in various construction projects.
Technical Details
SpECbuild MC500 is designed for a variety of concrete repair applications where high fluidity and ease of use are essential. Typical uses include:
- Structural repairs to columns
- Replacing sections of concrete beams
- Making good areas of honeycombed concrete with no feather edging.
SpECbuild MC500 offers several advantages that make it an ideal choice for concrete repair projects. Its unique formulation provides effective solutions for challenging repair situations, ensuring high performance and reliability. The key benefits include:
- No compaction required
- Low permeability inhibits the ingress of chlorides and carbon dioxide
- Excellent bond strength to adequately prepared concrete substrates
- May be placed by concrete pump
- Chloride free
SpECbuild MC500 is designed to deliver exceptional performance in concrete repair applications. The following technical information outlines the key characteristics and strength metrics of this versatile micro-concrete material:
| Property | Test Method | Value |
|---|---|---|
| Water Absorption ISAT | BS EN 1881-208 | 10 minutes: 0.025 ml/m²/sec 30 minutes: nil |
| Setting Time | BS EN 196-3 | Initial: 2.0 hours Final: 4.0 hours |
| Linear Shrinkage | ASTM C531-00 | 7 days: 0.060% |
| Coefficient of Thermal Expansion | – | 5 x 10-6 K |
| Compressive Strength | BS 6319-2 | 1 day: 25±5 N/mm² 3 days: 40±5 N/mm² 7 days: 55±5 N/mm² 28 days: 70±5 N/mm² |
| Flexural Strength | BS 6319-3 | 28 days: 10±2 N/mm² |
| Tensile Strength | BS 6319-7 | 28 days: 3 N/mm² |
Application
Preparation:
It is essential that adequate preparation is carried out prior to the application of SpECbuild MC500. The boundary of the repair area should be cut using a concrete saw to provide a neat edge to the repair with no feather edging. It is recommended that the saw cut be approximately 50mm deep. The area to be repaired may then be broken out up to the prepared boundary.
Repairs using SpECbuild MC500 should generally be at least 50mm as a minimum depth with a maximum of 200mm, although greater depths may be applied depending on the design of the structure being repaired. The substrate should be cleaned thoroughly to ensure the complete removal of dust, reinforcement corrosion products, oil, and grease. The prepared surface should be protected if any delay is anticipated prior to the application of the repair compound.
All reinforcement, which shows signs of corrosion must be fully exposed to an adequate depth behind the bar to allow ease of access for the fluid repair compound. The steel should be grit blasted to bright metal immediately prior to the application of SpECcoat Zn25 zinc-rich protective coating. Apply one coat of SpECcoat Zn25 to the cleaned steel ensuring full coverage, and allow to dry before commencing with the repair application.
Substrate Priming:
Normally, it will only be necessary to pre-soak the substrate with clean water for a period of at least one hour prior to the application of the repair compound. All water should be drained from the formwork prior to commencing the application of the repair material. SpECbuild MC500 should be applied while the substrate remains damp. This product cannot be mixed by hand.
Where it is deemed necessary to seal in chlorides, which could not be removed during the preparation stage, the use of SpECbuild Primer E1 is recommended. SpECbuild Primer E1 is a high-build epoxy primer, which completely seals the substrate. The product is applied for a dry substrate as a two-coat system, the second coat being applied as soon as the first is tack-free. Subsequent application of SpECbuild MC500 must be carried out while the second coat of primer is still tacky.
Mixing:
SpECbuild MC500 is a one-component micro concrete product. For mixing of single bags, it is acceptable to use a 25 litre steel pail as a mixing vessel, and mixing carried out using a slow speed electric drill (350/360 rpm) fitted with a SpECbuild Mixing Paddle. Where larger quantities of material need to be mixed at one time, a compulsory mixer is required. Do not attempt to use free-fall mortar mixers as the shear imparted is insufficient to adequately mix the repair compound.
Place the accurately measured 3.0 to 3.3 litres of clean mixing water into the mixing vessel and slowly add the contents of the bag of repair compound while the mixing paddle is running. To ensure complete and thorough dispersal, the product must be mixed for a minimum of 5 minutes. Mixing of part bags is not recommended.
Curing:
Any exposed areas not protected by formwork must be cured using a proprietary curing compound, such as SpECcure WE. Once the formwork is removed, the total repair area should be cured by the same process. This is of extreme importance at temperatures in excess of 30°C and secondary protection should also be considered to completely seal the repair area against drying winds, which could render the repair completely ineffective.
Preparation:
It is essential that adequate preparation is carried out prior to the application of SpECbuild MC500. The boundary of the repair area should be cut using a concrete saw to provide a neat edge to the repair with no feather edging. It is recommended that the saw cut be approximately 50mm deep. The area to be repaired may then be broken out up to the prepared boundary.
Repairs using SpECbuild MC500 should generally be at least 50mm as a minimum depth with a maximum of 200mm, although greater depths may be applied depending on the design of the structure being repaired. The substrate should be cleaned thoroughly to ensure the complete removal of dust, reinforcement corrosion products, oil, and grease. The prepared surface should be protected if any delay is anticipated prior to the application of the repair compound.
All reinforcement, which shows signs of corrosion must be fully exposed to an adequate depth behind the bar to allow ease of access for the fluid repair compound. The steel should be grit blasted to bright metal immediately prior to the application of SpECcoat Zn25 zinc-rich protective coating. Apply one coat of SpECcoat Zn25 to the cleaned steel ensuring full coverage, and allow to dry before commencing with the repair application.
Substrate Priming:
Normally, it will only be necessary to pre-soak the substrate with clean water for a period of at least one hour prior to the application of the repair compound. All water should be drained from the formwork prior to commencing the application of the repair material. SpECbuild MC500 should be applied while the substrate remains damp. This product cannot be mixed by hand.
Where it is deemed necessary to seal in chlorides, which could not be removed during the preparation stage, the use of SpECbuild Primer E1 is recommended. SpECbuild Primer E1 is a high-build epoxy primer, which completely seals the substrate. The product is applied for a dry substrate as a two-coat system, the second coat being applied as soon as the first is tack-free. Subsequent application of SpECbuild MC500 must be carried out while the second coat of primer is still tacky.
Mixing:
SpECbuild MC500 is a one-component micro concrete product. For mixing of single bags, it is acceptable to use a 25 litre steel pail as a mixing vessel, and mixing carried out using a slow speed electric drill (350/360 rpm) fitted with a SpECbuild Mixing Paddle. Where larger quantities of material need to be mixed at one time, a compulsory mixer is required. Do not attempt to use free-fall mortar mixers as the shear imparted is insufficient to adequately mix the repair compound.
Place the accurately measured 3.0 to 3.3 litres of clean mixing water into the mixing vessel and slowly add the contents of the bag of repair compound while the mixing paddle is running. To ensure complete and thorough dispersal, the product must be mixed for a minimum of 5 minutes. Mixing of part bags is not recommended.
Curing:
Any exposed areas not protected by formwork must be cured using a proprietary curing compound, such as SpECcure WE. Once the formwork is removed, the total repair area should be cured by the same process. This is of extreme importance at temperatures in excess of 30°C and secondary protection should also be considered to completely seal the repair area against drying winds, which could render the repair completely ineffective.
SpECbuild MC500 is available in convenient packaging to suit your project needs:
SpECbuild MC500 is supplied in 25kg bags. Each bag when mixed with water will provide approximately 12 litres of mixed material.
SpECbuild MC500 is supplied in 25kg bags. Each bag when mixed with water will provide approximately 12 litres of mixed material.
For information regarding warranty details for SpECbuild MC500, please contact our team at SMCC using any of the available contact methods listed on this page.
Product FAQ
SpECbuild MC500 is suitable for structural repairs to columns, replacing sections of concrete beams, and repairing honeycombed concrete areas.
SpECbuild MC500 must be mixed using a slow-speed electric drill (350/360 rpm) with a SpECbuild Mixing Paddle. A 25 kg bag requires 3.0 to 3.3 litres of clean water. Mix for a minimum of 5 minutes for thorough dispersal. Part bags should not be mixed, and free-fall mortar mixers are not suitable.
Exposed areas not protected by formwork must be cured using a proprietary curing compound, such as SpECcure WE. After removing formwork, the total repair area should be cured similarly. This is crucial in temperatures above 30°C, and secondary protection against drying winds is recommended to ensure repair effectiveness.
SpECbuild MC500 offers several key advantages for concrete repair projects, including no compaction required for application, low permeability which inhibits the ingress of chlorides and carbon dioxide, excellent bond strength to properly prepared concrete substrates, suitability for placement by concrete pump, and it is chloride-free. These benefits enhance efficiency, reliability, and durability in a variety of construction applications.
SpECbuild MC500 has the following technical specifications: – Water Absorption ISAT (BS EN 1881-208): 10 minutes: 0.025 ml/m²/sec; 30 minutes: nil – Setting Time (BS EN 196-3): Initial: 2.0 hours; Final: 4.0 hours – Linear Shrinkage (ASTM C531-00): 7 days: 0.060% – Coefficient of Thermal Expansion: 5 x 10^-6 K – Compressive Strength (BS 6319-2): 1 day: 25±5 N/mm²; 3 days: 40±5 N/mm²; 7 days: 55±5 N/mm²; 28 days: 70±5 N/mm² – Flexural Strength (BS 6319-3): 28 days: 10±2 N/mm² – Tensile Strength (BS 6319-7): 28 days: 3 N/mm²
SpECbuild MC500 is preferred for its high fluidity, no compaction requirement, low permeability to prevent chloride and carbon dioxide ingress, excellent bond strength, and suitability for pump application. Its formulation minimizes shrinkage while delivering reliable performance in various concrete repair applications.
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For further inquiries about SpECbuild MC500, including pricing, technical support, or project applicability, please reach out to our dedicated team. We are here to assist you in selecting the best solutions for your concrete repair needs and ensuring project success.