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Structural Repair (Jacketing)
ApcoBuild MicroRepairo + ApcoBuild Seal N Safe

For concrete

  • Expose the reinforcement bars in the spalled cracked concrete by removing / chipping to a minimum depth of 10mm behind the reinforcing bars. The repair area section shall be profiled to get U Shape or square shape with an inward tapering edge of reinforcement.
  • The exposed reinforcing bars shall be cleaned thoroughly to remove all traces of rust, scales, etc., by using wire brush, emery paper etc.
  • The lateral ties/stirrups shall also be cleaned in the same way. After removal of corroded portion, the diameter of the reinforcement shall be checked and compared with the drawings.

Provision of additional reinforcement

  • If the diameter of reinforcing bars in the concrete repair section is reduced substantially (say >20%) of its original size additional bars shall be provided as per the design. This additional reinforcement shall be properly anchored to the existing concrete by providing adequate shear connectors. Weld mesh may also be provided if found necessary depending on the recommendation of Structural / Design Engineer.

 

  • Priming of reinforcement bars

    • The exposed and cleaned reinforcing bar shall be provided with a coat of of Epoxy Zinc Primer Or with a passivativing layer of polymer coating in ratio of 1:1 of ApcoBuild Seal N Safe with Cement . A second coat if needed may be provided to achieve a uniform and continuous film.

    Formwork and shuttering

    • Slurry tight and strong form work shall be provided. The shuttering for encasement shall be kept ready such that the formwork shall be placed in position and fixed such that the ApcoBuild MicroRepairo can be poured into the form work within the overlay time of the bonding agent (4 - 5 hours).
    • Adequate supports shall be provided for the formwork. Care should be taken to ensure leak proof shuttering. Under no circumstance the slurry shall flow out of the shuttering during pouring of Micro Repairo.

    Mixing of micro concrete

    • ApcoBuild MicroRepairo, a cementitious, non-shrink micro concrete shall be mixed using the appropriate water powder ratio as mentioned in the technical data sheet.
    • The mixing shall be done mechanically and under no circumstance hand mixing is allowed. Mixing shall be carried out for 3 to 5minutes to ensure thorough homogeneous mix is obtained without any bleeding or segregation. In hot climate ice cooled water shall be used to maintain the temperature of mixed material.
    • If the encasing thickness is more than 75 mm, add stone aggregates up to 50 % by weight of micro concrete to the mixed micro concrete directly into the mixer hopper. The stone aggregates must be 12 mm and down and shall be clean, washed and dried.
    • Mix first micro repairo with recommended dose of water for about 3 minutes in mixer and then pre weighed stone aggregates into the mixer. Mix further for about 2 minutes till lump free mix is obtained. Do not add extra water than mentioned in the technical data sheet.

    Pouring of micro concrete

    • The mixed ApcoBuild MicroRepairo shall be poured into the formwork using a suitable funnel or through a hose pipe. It must be poured from one end only. A suitable hopper / funnel arrangement shall be made at site to facilitate the pouring operations.
    • The pouring operation shall be continuous and it shall not be stopped unless the job is completed. To achieve this, sufficient mixers / drilling machines and wok force shall be arranged at site.

    De shuttering

    • The shuttering from the sides of the R C members shall be removed after a period of 48 hours. However, the formwork of the soffit shall be retained and removed after 3 days.

    Curing

    All the repaired and encased area shall be fully cured as per standard concrete practices. Curing compound  shall be used for effective curing of sides and soffits of beams.
  • Always maintain the water : powder ratio as per specification for the desired strength
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Disclaimer: These suggestions and data are based on information which we believe to be reliable. They are given for information only and in good faith, but without guarantee, as conditions and methods of use of our products are beyond our control. We recommend that the user determines the suitability of our materials and suggestions before adopting them on a commercial scale.
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