Concrete Repair

Cement Based Repair Products

Monneli Betocem HCS

High Compressive Strength Repairing Mortar

Uses
BETOCEM HCS is designed to provide a structural grade repair mortar particularly in situations where abrasion resistance and imperviousness are required such as:
General concrete repair
Repairs to structural concrete elements, e.g. reinforced beams and columns
Highly trafficked surfaces, particularly transition strips adjacent to mechanical bridge joints.
Repairs in marine environments or other situations, where concrete is in contact with chloride or Sulphate solutions
Floor repairs in industrial areas, especially if exposed to oil or lubricants
Honeycombing repairs
Pile cap re-profiling and treatment
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Technical Information
Product Description

BETOCEM HCS is a one component polymer modified cement based mortar, designed as a high compressive strength repairing mortar. It is composed of high resistance hydraulic binders, silica, graded aggregates and special additives, which gives a high strength, non-shrink mortar, fit to the applied vertically in a large thickness.

Advantages
  • Easy to mix and apply
  • Excellent bond strength to concrete substrate.
  • Good abrasion resistant
  • Shrinkage-compensated
  • High compressive strength
  • Low permeability providing protection against the ingress of chlorides and carbon dioxide
Packaging, Coverage / Consumption

Packaging:

BETOCEM HCS is packed in 25 kg bags.

 

Yield: 

12.9 liters / 25 kg bag with 2.8 liters water addition.

Shelf Life & Storage

Storage:

Store in a dry covered place. In these conditions the product maintains its stability for 12 months.

Colors
Grey
Technical Properties
PROPERTIES

RESULTS

Appearance

Grey powder

Wet density at 25°C

2.15 kg/L

VOC

0.1 g/L

Granulometry

0-3.5mm

Thickness per coat

10 – 60 mm vertical

10 – 35 mm overhead

10 – 100 small pockets & horizontal

Compressive strength (ASTM C579)

After 7 days

55 N / mm2

After 28 days

75 N / mm2
Flexural strength (ASTM C580)
After 28 days Up to 11 N / mm2
Tensile strength (BS 6319 Part 7)

After 28 days

>3 N / mm2
Water absorption (BS 1881)

4%

Drying shrinkage (ASTM C157-93)

At 7 days

At 28 days

Rapid chloride permeability (ASTM C1202)

Low

Workability at 25ºC

>30 minutes

Application temperature

from +5ºC to +35ºC

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 with a marker. 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, 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 HCS 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 3.5 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 HCS 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 to ensure thorough compaction around the reinforcement and against the edges of the reinstatement area. The repair then can be finished with a steel trowel. The product can be applied up to 60 mm in thickness in vertical, and in 100 mm layers in small pockets or horizontal plane. The material should not be applied at less than 10 mm thick layer.

Use a steel trowel 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 HCS 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 HCS 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 HCS 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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