BETEC® 250

Product description

BETEC® 250 is a cement based, volume stable micro-concrete with high initial and final strength development with final strength class of C80/95 and tested fatigue resistance ac-cording to Model Code 90, Model Code 2010 and Eurocode 2 part 2 (2010). BETEC® 250 stands out by controlled volume expansion and offers maximum durability and applicability.

Advantages

• High early- and final strength development to strength class C80/95 for the most durable and reliable structural connections, statically and dynamically load bearing.
• S-N curves according to Model Code 90, Model Code 2010 and Eurocode 2, part 2 (2010) can be used for design without restrictions.
• High surface load capacity guarantees long-term maintenance-free constructions
• Extended workability times and exceptional rheology are ensuring fast, easy and cost effective application even with pumps.
• Compact mortar matrix due to self-compacting and controlled volume expansion.
• Declaration of performance according to EN 1504-6

Certificates

• Declaration of performance according to EN 1504 part 6 / System 2+
• Assessment for fatigue strength according to Model Code 90, Model Code 2010 and Euro-code 2, part 2 (2010).

Areas of Application

All grouting applications where superior applicability, high performance and durable connections are required:

• Assembly of pre-cast constructions
• Grouting of bridge bearings and bridge support structure
• Grouting of machines and industrial equipment
• Assembly of wind energy towers and anchoring in the foundation
• Grouting of rails and sleepers.

Product Properties

Technical Data/Properties(*)

_{^{(1) Typical values in production control. All tests were executed under a conditioned temperature of 21°C and 65% RH.
(2) The illustrated compressive strengths are measured with 150 mm cubes.
(3) According to EN 206-1:2001 in combination with DIN 1045-2
(4) At +5 °C material and surrounding temperatures the micro-concrete achieves ~5 MPa after 26 hours.}}

Application

1. Preparation of Substrate

• Substrate preparation has to be according EN 1504-10 section 7.
• The substrate has to be free from dirt, grease, laitance, loose concrete, loose particles or layers which could adversely affect adhesion.
• Remove all damaged concrete and prepare substrate by sand or grid blasting, high pressure water jetting, or other methods until base concrete is ex-posed, offering sufficient roughness (bond) and open pores.
• The substrate must be pre-wetted with clean water until saturated. The substrate should be damp, but without free standing water.
• The substrate must be frost-free and have a cohesion of minimum 1.5 MPa.

2. Mixing

• The product has to be mixed using a suitable forced action mixer (400-600 rpm). The mixing head must be completely immersed in the powder.
• Add the total required quantity of water into the mixer, add the powder and mix for 5 minutes until a lump-free, homogeneous mixture is obtained. Never use more than the maximum water quantity.
• The mixing time depends on the type of mixer. 5 minutes is the minimum.
• The mixture must be allowed to rest to release air entrapped during mixing.
• Once the grout is ready mixed, apply immediately. Do not prepare more material than can be used within the open time of the material.
• When the grout starts to set, remix but never add more water.

3. Application

• The material is always poured or pumped from one side or corner in one continuous application. A dense and non-absorbent formwork is necessary. To prevent air entrapment, sufficient ventilation holes must be provided.
• Do not vibrate.
• When grouting large areas, apply the grout by using worm/screw pumps.

4. Curing

• After treatment has to be according EN 13670 in combination with DIN 1045-3.
• In warm or windy conditions protect the applied material from dehydration by mist-spraying with clean water or protective tarpaulins until the initial set has taken place.
• In cold conditions cover with insulated tarpaulin, polystyrene or other insulating material. Protect sur-faces against frost and rain until final set has taken place.
• In cold, humid or unventilated areas it can be necessary to allow for a longer curing period, or to intro-duce forced air movement to avoid condensation. Never use dehumidifiers during the curing period or within 28 days after application.
• Formwork should not be removed for at least 48hours.
• The after-treatment should be at least 5 days.
• The after-treatment should take place as soon as possible, at the latest when the material surface starts to set.
• As an alternative to the conventional treatment methods, suitable curing agents can be used to prevent rapid water loss.

5. Cleaning and maintenance

• Mixing and application equipment should be cleaned immediately with clean water. Hardened material needs to be removed mechanically.

6. Special remarks

• Cementitious materials can lead to incompatibilities under certain conditions in combination with non-ferrous metals (such as aluminium, copper, zinc).
• Low temperatures reduce flow and delay the early strength development. High temperatures accelerate the strength development and decrease the open time of the material.
• Depending on geometry and application thickness, reinforcement steel can be necessary.
• Lateral grouting overhang should be kept as low as possible (approx. 20-50mm).

Health and Safety

BETEC® 250 is a product based on cement and can therefore cause burns to skin and eyes, which should be protected during use. Wear gloves and protective eye shields. Wearing a dust mask is advised. Treat splashes to eyes and skin immediately with clean water. Consult a doctor when irritation continues. If accidentally ingested, drink water and consult a doctor. Users must comply with all risk and safety phrases. MSDS’s can be obtained from GCP Applied Technologies or from our website. GISCODE ZP1.

CERTIFICATE

BETEC® 250