Fixing of marble panel

Fixing of marble panels

Cement slurry shall be poured within the gap between tiles and plaster, this is to ensure that there is no void left between tiles and plaster surface. 

Sand mixed with dust particles is sprinkled over applied adhesive on the rear side of marble panel, this is wrong practice as panel will not get proper bondage strength. Using clean 20mm cubical aggregates will get satisfactory bondage strength.

Procedure for laying tiles

Marking the floor


Laying the tiles


Cutting edge tiles


Grouting of tiles

Mixing of mortar on marble flooring

Mortar was being mixed on marble flooring, its a wrong practice as marble floor may get damaged or can get scratch marks.

Inadequate foam on starters

Foam used at starter for preventing slurry leakage is inadequate.

Moderate honeycombing

Moderate honeycombing and vertical offset was observed on column no C-4.

Primary causes of voids or honeycombs in reinforced concrete

• Form Leaks - Leaks in the form-work can allow the cement paste to escape out of the form leaving behind only un-bonded aggregate and rock pockets.
• Inadequate Vibration - When the concrete is properly vibrated it acts more like a liquid allowing it to better settle in the form, consolidate around the reinforcement and completely fill the forms. It also helps in releasing any of the air voids in the mix to the surface. Improper vibration can be related to:
  • Too small or large a vibrator for the size of the pour and mix design
  • Too low a frequency or amplitude of the vibrator for the size of the pour and mix design
  • Too short or long an insertion time of the vibrator in the concrete in a single location
  • Too wide of a spacing between each insertion of the vibrator
  • Congested reinforcing that will not allow a standard vibrator to reach all areas required

• Mix Design - Improper mix design can lead to low workability, early stiffening or an aggregate that is too large to properly consolidate the concrete for a given application. A good mix design should take in consideration the issues noted for rebar congestion and lift depth.

• Rebar Congestion - if rebar is placed too close together or too close to formwork it will trap the larger pieces of aggregate while the mortar in the mixture may or may not pass through. Other causes related to rebar congestion include excessive reinforcement splices that prevent the concrete from properly filling the forms.

• Lift Depth - When single concrete placements or "lifts" are too deep, proper vibration can become very difficult or impossible. Excessive lift depths can also allow too much free-fall of the concrete that can create a separation of the cement mortar and aggregate as the aggregate impacts the reinforcing steel when falling through the forms.

Repairing of honeycombing

• Mild and moderate honeycombs shall be repaired using Non-shrink mortar mixed with bonding chemical.
• Curing of repaired patch shall be cured using curing compounds.
  

Mock up for Form work of column

You can see the gap between side of beam and Formwork, its the cause for leakage of slurry.

Leakage of slurry on column surface due to gap in formwork

Mr Vishambharam ( CQRA representative ) conducting mock-up for Foam work for column.

Fire Fighting Training conducted on site

General Safety and Fire-fighting training was conducted on Orbit-Terraces site, every one was demonstrated the usage of fire-extinguisher. It was very sporting of Mr Jatin Sampat ( Project incharge -Terraces ) to interact with labours and uplift their spirits.