BETEC 311 / 330

BETEC 311 / 330 are synthetic modified and strengthened by synthetic fibre repair mortars based on Portland cement. These mortars are also highly suited for manually performed repairs (pcc) as well as for the wet-guniting system.

During manufacturing only high-quality aggregates are used, which meet the strictest requirements. During the production process as well as during the final stages these materials are extensively tested for quality, not only in our own laboratory, but also in independent acknowledged institutes.

• Concrete repairs to bridges, fly-overs, tunnels
• Concrete repairs to the off-shore industry
• Concrete repairs to chimneys
• Concrete repairs in the chemical and petrochemical industry
• Concrete repairs in installations for sewage purification

• Synthetic modified one-component fibrous mortar, ready for use, which is easy to process and environment-friendly
• Chromate reduced
• Very easy to finish
• Checked volume increase
• No plastic shrinkage
• Very high early and final strengths, therefore loading is possible soon after application
• Resistant to frost and gritting materials, like salt
• Free of chlorides and other corrosive aggregates
• Contains no aluminous cement
• Complies with the requirements drawn up for prestressed concrete
• Very good adhesion to concrete and steel
• Highly resistant to oil and grease
• Betec 330 has been approved for application in installations for drinking water
• Very low rebound
• Because of the wet-guniting technology, excellent compaction of the mortar is realised

Anchor Fixations

FIXING OF REINFORCEMENT BARS AND ANCHORS WITH BETEC MORTARS

Because Betec mortars adhere particularly well to concrete and steel, these materials are eminently suitable to bond reinforcement bars and anchors to all types of mineral construction materials. Vertical anchors, horizontal wall anchors and overhead vertical anchors can all be bonded using Betec cement based mortars.
Special Betec moulding mortars can be used for floor anchors. Because the space between the an-chor and the wall of the opening is usually limited, Betec 110, Betec 200 or Betec 801 (rapid mortar) is most suitable for this purpose. 
Only Betec 110, Betec 200 or Betec 801 can be used for wall anchors if the openings can be drilled downwards min -15 C at an angle, otherwise the moulding mortar would escape from the opening. Betec AM is suitable for completely horizontal openings. This mortar has a consistency similar to cream, which makes it easy to pump and prevents its from escaping from the opening. Betec AM can also be used for overhead openings. 

OPERATING METHOD 
Vertical downward:

• Drill the anchor opening at least 6 mm larger than the anchor to be fixed.
• Preferably submerge the opening in water after drilling to saturate the surrounding concrete with water.
• Extract standing water out of the opening before actual fixing.
• Pour the Betec moulding/injection mortar (prepared according to processing instructions on the back of the bag) in the opening and lower anchor into it.
• Once the moulding mortar has set, protect it from dehydration with curing compound, or keep it wet with clean mains water.

Horizontal, and vertical upward:

• Drill the anchor opening at least 6 mm larger than the anchor to be fixed. However, with large anchor diameters and bonding depths it is better from a technical point of view to drill the anchor quite gen-erously minium 10 mm bigger.
• Moisten the fixing opening with clean mains water well beforehand to ensure that the surrounding concrete is saturated.
• Remove excess water.
• Insert the Betec AM (prepared according to processing instructions) in the opening using a manual pump or cement gun and position the anchor in it.
• Once the moulding mortar has set, protect it from dehydration with curing compound, or keep it wet with clean mains water.

Table 1: acceptable force with bonding depth 10 times the anchor diameter:

FR= acceptable force in calculation stage (Kn)
FU= acceptable force in failure stage (Kn)

Table 2: Adhesive stress between anchor adhesive and concrete:

Table 3: Edge and axial distances:

General Processing Advice Trowel and wet guniting grouts (cement-bound) [B]

Preliminary treatment of the ground
Before applying BETEC repair mortar, the mineral ground should be freed of cement skin, dirt, grease, oil, dust, curing compound, paint residues, loose parts and other contaminants.
The ground should be roughened to such a degree that good adhesion is obtained.
Roughening and removing the cement skin from the mineral ground can be carried out by means of mechanical actions such as spraying water under high pressure, grit blasting, dabbing, grinding or hacking (pneumatically, electrically, manually).
The mineral ground should be frost-free!

Pre-moistening of the ground
Highly absorbing grounds must be moistened with clean tap water until no more water is absorbed in ample time before the repair material is applied. When applying the reparation mortar the ground should not be water-repellent (glistening wet); this will reduce adhesion. If the ground still shows too much water absorption, the adhesive surface will burn because of the low water-cement ratio.
There are various options for additional adhesive layers, dependent on the surface and field of application; refer to our technical staff concerning this.

Mixing
BETEC repair mortars can be mixed in a free-fall concrete mixer, forced mixer, Deys 200 groutautomatic or in case of smaller amounts with a plaster mixer for electric drilling machines.
For the correct water dosage we refer to the front of the packaging; the minimum and maximum water dosage are mentioned there. The water dosage should not be below the minimum need for water, the maximum dosage must not be exceeded.
Fill the mixer with 2/3 of the water dosage indicated, then add the BETEC repair mortar.First mix thoroughly, so that a mixture free of lumps is produced. Then gradually add the remaining 1/3 of the mixing water until the correct consistence is realised; do not add any more water than strictly necessary.

• Do not add water afterwards
• Always use clean tap water, or suited mixing fluids delivered by us
• The total mixing time amounts to a minimum of 3 minutes (approximately 3-5 minutes)
• The processing time amounts to approximately 50-70 minutes (high-early-strength mortars approximately 10 minutes) (20ºC)

Note: in order to obtain a polymer modified repair mortar (PCC), polymer dispersion BETEC 410 should be added to the mixing water; the ratio depends on the application: 5 to 3 parts water for 1 part BETEC 410. It is also possible to use PCC mortars which are ready for use - refer to our technical staff concerning this.

Processing
Dependent on the type of mortar, BETEC repair mortars can be applied manually or mechanically (wet-guniting system).
In manual applications, often an adhesive layer BETEC 031 or from BETEC 410 mixed 1:4 parts with tapped water should be applied; this layer must be brushed with force into the ground with a broom or a steel brush. The repair mortar should be applied within the processing time of the adhesive layer (WET-IN-WET). Dry adhesive layers must be removed.Another option is the application of an adhesive layer of the same material.

• Minimum processing temperature of BETEC repair mortars is 5ºC; for the application in temperatures of +5ºC to -5ºC you should consult our technical staff concerning measures that should be taken in winter.

Curing
Because BETEC repair mortars are cement-bound, it is of the greatest importance that the mortar is cured. Because of the low water-cement ratio the mortar must be cured for 5 days at the minimum in order to prevent premature desiccation and ensuing shrinkage. This can be done by wetting with clean tap water. Another option is to cover the mortar with moist burlap covered with synthetic foil. Less time-consuming is the use of BETEC BETOFILM curing compound which must be applied in two layers.

Packaging and storage
BETEC mortars are delivered in packages of 20/25 kg; packaging consists of several layers of paper, with layers of perforated synthetic material in between. The packaging material is not water-tight and must be stored in a dry and frost-free place. In the original closed packaging the storage life of the mortar is 12 months.

Health & Safety
BETEC® are products 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 drinking 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. Safety data sheets can be obtained from Deys Betontechniek or from our website. GISCODE ZP1.