Fluid Non-Shrinking Mortar for Degraded Concrete Repair
BETOCEM FLOW is a non-shrinking mortar composed of high resistance hydraulic binders, silica sand, selected aggregates and special additives. The product is characterized with excellent properties such as: free flowing, high adhesion to the support and resistance against Sulphates. It is fibre reinforced, and very fluid which makes it suitable to be casted into tight shuttering.
Packaging:
BETOCEM FLOW is supplied in 25 kg bags.
Yield:
12.5 liters / 25 kg bag with 3.5 liters water addition.
Storage:
The product must be kept in dry and sheltered place, in these conditions its shelf life will be 12 months.
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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.
Prepare the formwork to be rigid and tight to prevent loss of material. The formwork should include drainage outlets for pre-soaking.
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
Surface to be repaired should be soaked with water for several hours prior to application of BETOCEM FLOW, to minimize local absorption and to assist in the free flow of material.
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 FLOW 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
To prepare the mortar, it is recommended to have a forced-mixer of spiral paddle in a slow speed (300/400 rpm) heavy duty drill. It is essential that machine mixing capacity and labour availability is adequate to enable the placing operation to be carried out continuously.
Add 3.3 – 3.5 liters of water in the mixing drum then add the full bag of BETOCEM FLOW and mix for at least 4 – 5 minutes till obtaining a fluid, uniform lump free consistency mix.
Do not part mix the bags, nor use additional water than specified. Note that powder must always be added to water.
To obtain the full benefit of the fluidity provided, apply BETOCEM FLOW immediately after mixing.
Application
Cast the mortar into the formwork, allowing air to escape. It's advisable to spray the formwork by water prior to placing the mortar to avoid water absorption from the mix.
BETOCEM FLOW should be place in a single continuous operation. The material should be poured slowly to prevent air entrapment. BETOCEM FLOW can be used for thickness that ranges from 20 mm to 200 mm. For higher thickness, the addition of suitable graded 5-8 mm aggregate (up to 30% can be added). This could increase the thickness of applied mortar by 80 mm. Vibration process to the mixture is not necessary.
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.
Cleaning
BETOCEM FLOW 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
BETOCEM FLOW 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.
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.
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