Concrete Repair

Cement Based Repair Products

Monneli Betocem Fibre

Fibre Reinforced Shrinkage Controlled Mortar for Concrete Repair

Uses
BETOCEM FIBRE is suitable for use on a wide range of concrete and masonry repairs. It can be applied on vertical, overhead or horizontal places without the use of formwork.
Typical applications would include:
Repairs for edges of beams and pillars
Risers of balconies & terraces
Tunnels
Degraded concrete castings
Reconstruction of concrete structural elements - filling honeycombs in reinforced concrete, rigid joints filling, etc.
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Technical Information
Product Description

BETOCEM FIBRE is a cement mortar composed of high resistance hydraulic binders, silica sand, selected aggregates, special additives and synthetic fibers. The ready to use blend is supplied in dry powder which requires the addition of clean water only to produce an easily workable mortar with thixotropic effect.

Advantages
  • Excellent adhesion to the old concrete
  • Good mechanical resistance both flexure and compression
  • Shrinkage compensation - reduces the risk of cracking
  • Excellent thixotropic behavior
  • Low permeability, gives excellent resistance to attack by Sulphates and other aggressive elements
  • 2 cm layer of the cured product is resistant against CO2 diffusion in the same degree as 15 cm layer of concrete
  • High thickness is achieved without formwork - saving time and expense of multiple applications
Packaging, Coverage / Consumption

Packaging:

BETOCEM FIBRE is supplied in 25 kg bags.

 

Yield: 

14.0 liters / 25 kg bag with 4.5 liters water addition.

Shelf Life & Storage

Storage:

The product must be kept in dry and sheltered place, in these conditions its shelf life will be 12 months.

Technical Properties
PROPERTIES

RESULTS

Appearance

Grey powder

Density at 25ºC

2.1 kg/L

VOC

1.0 g/L

Granulometry

0 – 2.5 mm

Thickness per coat

10–50 mm vertical

10–25 mm overhead

10–100 small pockets & horizontal

Water Impermeability (BS EN 12390 Pt 8)

 <10 mm

Water absorption (BS 1881 Pt 122)

 <2 %

Compressive strength (ASTM C 579)

At 7 days

  34 N / mm2

At 28 days

>45 N / mm2
Tensile strength at 28 days (BS 6319-7)

>3.5 N / mm2

Flexural strength (ASTM C 580)

At 7 days

5 N / mm2
At 28 days 7 N / mm2

Adhesion to concrete at

28 days (BS 1881 Pt 207)

1.6 N / mm²
Drying Shrinkage (ASTM C157-93)

 7 days

28 days

Linear thermal expansion (BS 6431-15)

1 x 10-6 µm

Workability at 25ºC

>30 minutes

Application temperature

from +5ºC to +35ºC

Test performed at 250C, 50% of relative humidity and in absence of ventilation.

All values are subject to 5-10 % tolerance

Application Information
Instructions for use

Concrete preparation

The surface of the concrete to be repaired should be sound, clean and uncontaminated. The decayed or damaged area to be repaired should be marked. Cut the marked area to a depth of at least 10mm using a hand held concrete saw or disc grinder to avoid feather edging and to provide a square edge. Break out or chip the complete repair area down to sound base using sharp tools or chipping hammer.

Oil and grease deposits should be removed by stiff brushing, detergent scrubbing with a heavy duty cleaner/degreaser or steam cleaning.

Steel preparation

Any corroded steel in the repair area must be fully exposed. All exposed reinforcement shall be cleaned of corrosion products by wet grit blasting or other approved means to achieve a clean and bright finish. In case that reinforcing bars section is reduced due to oxidization, integrate them with additional bar reinforcement.

Priming

Steel Priming

The cleaned steel should be coated within 3 hours. Apply one coat of BETOFER, a corrosion proof cementitious based primer or EPOZINC, a two component Zinc rich EPOXY PRIMER, continuously with brush onto the cleaned bar reinforcement ensuring that the whole steel surface area is completely covered. Allow to dry before proceeding with the repair.

Concrete Priming

If the concrete deterioration is due to Chloride attack, it is recommended to use EPORIPRESA, an epoxy
bonding agent. It will cure to form a barrier against Chloride ions.

However if the cause is Carbonation, dampen the surface with clean water (avoiding free standing water) and apply thin coat of AR LATEX RIPRESA, an Acrylic bonding agent.

BETOCEM FIBRE must be applied before the bonding agent dries while it’s still tacky to achieve a better bond between the fresh and cured section.

Mixing

For mixing process, a slow speed drill (200- 300rpm) fitted with a suitable paddle is recommended. Place 4.0-4.5 liters of cold clean water in the mixing bucket. With the drill in operation, add the entire content of the 25 kg bag of BETOCEM FIBRE while mixing continuously till a uniform lump free consistency mix is achieved. Powder must always be added to water.

Allow the obtained mix to stand for about 3 minutes and then remix before application. Under no circumstances should partial mixing be considered.

Application

Apply the product manually with a trowel or spatula with full compaction, to primed substrate while it is still tacky.

The minimum applicable coat thickness is 10 mm and the maximum thickness shall be 50 mm for vertical and 25 mm for overhead sections. For small horizontal sections thickness should be from 10mm up to 100 mm. Application thickness is dependent on repair size and granulometry. High build applications can be achieved through temporary formwork.

If the application of the second coat is necessary the previous layer should be cross hatched and allowed to take up its initial set before applying the next coat.

Use trowel or sponge for the finishing touch.

Curing

The repaired area shall be cured in accordance with good concrete curing practice and protected from drying winds, sun or excessive heat. Curing shall be done with non- degradable curing compound BETOCURE AR. Alternatively; a wet hessian cloth covered with polyethylene sheet can also be employed. Curing should begin as soon as final finish is achieved.

In fast drying conditions, supplementary curing with Polythene Sheets must be used.

Cleaning

BETOCEM FIBRE should be removed from tools and equipment and mixers with clean water immediately after use. Cured material should be removed mechanically.

Equipment used for applying EPORIPRESA, the epoxy bonding agent should be cleaned with SOLVENTE 10.

Recommendations

  • Do not apply the product at temperature less than +5ºC
  • Do not add water once the mix has begun to set
  • BETOCEM FIBRE should not be exposed to running water either during application or prior to final set
  • Do not mix the bags partially
  • In warm weather, store the material in cool place. Make sure to use cool water to keep the mixed mortar temperature below 30ºC.
Additional Information
Health & Safety

BETOCEM FIBRE can be harmful to skin as it contains cement powders which may releases alkalis when mixed with water. During application, wear appropriate protective clothing, goggles, gloves and respiratory equipment if necessary.

In case of contact with skin, rinse with water and again wash thoroughly with soap and water. In case of contact with eyes, rinse with plenty of water and seek medical advice accordingly. If ingested, obtain medical attention immediately. Do not induce vomiting.

Important note

The information in this Technical Data Sheet is based on Colmef Monneli’s experience. Colmef Monneli does not accept any liability arising from the use of its products as it has no direct or continuous control over where or how its products are applied. All Colmef Monneli’s Data Sheets are updates on regular basis. It is the user’s responsibility to obtain the latest version.

additional materials
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Technical Properties Sheet
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Polymer Modified Elastomeric Cementitious Waterproofing Coating

Uses
CEMCOAT FX2 can be used in the following:
Waterproofing walls made of concrete, limestone, porous concrete and brickwork
Waterproofing of monolithic water tanks and rain water retention basins, pools canals
Waterproofing coating for roofs, domes, tunnels, spillways, precast slabs and other wet areas
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