METHODOLOGY / PROCEDURE OF VDF FLOORING OR TREMIX CONCRETE

WORK METHODOLOGY / PROCEDURE OF VDF FLOORING

OR TREMIX CONCRETE;

 

Ø  Chipping and clearing of dead / loose mortar shall be done.

Ø  Watering shall be done for minimum of 2 to 4 hours before concreting.

Ø  Fix the panels dividers (as mentioned in the drawing) in position for diagonally alternative panels.

Ø  The panel’s size should not be more that 3 M X 30 M (90 Sqm) or as per project requirements.

Ø  Dividing strips of MS Chanel (guide Channel) shall be fixed as per the panel layout to correct line and level.

Ø  The surface of the guide channels (on which the surface vibrator is supported), shall be cleaned from loose concrete/mortar.

Ø  Align the guide channels to true required level.

Ø  Top of the guide channels must match with the required slope and finished floor level.

Ø  Guide channels fixing can be done with Concrete / mortar in advance.

Ø  Thermocol sheet or equivalent board shall be provided around the column surface to avoid the joint between tremix concrete and Column and same board shall be removed and filled with Bitumen or any other suitable material.

Ø  Before starting Tremix concrete laid/spread the cement slurry shall be applied on the existing concrete surface.

Ø  Concreting shall be done in the sequence of laying in alternative panels.

Ø  Panel casting layout shall be strictly followed.

Ø  Approved grade of pumpable Concrete shall be placed at required thickness and distributed evenly and as near the final level as possible.

Ø  Concrete will be vibrated with an immersion vibrator in front of screed vibrator.

Ø  Heaping of concrete in front of screed vibrator will be avoided.

Ø  Ensure that the areas close to channels and stop ends are carefully vibrated

Ø  Surface vibration should start as soon as there is enough concrete in front of the screed vibrator.

Ø  Screed Vibrator is to be pulled from both ends.

Ø  Vacuum dewatering process must start within 30 minutes from the time of start of concrete pouring.

Ø  The filter pads are placed in such a way that there is atleast 100 mm (4”) fresh concrete visible around the filter pads on all four sides.

Ø  Suction pad must be rolled open over the filter pads and dewatering must then started.

Ø  Physical check of dewatered surface which should not give foot print while walking to be seen. Excess/less dewatering not advisable.

Ø  While repeating dewatering process subsequently, suction pad must be rolled out at least 300 mm over the vacuum dewatered area.

Ø  The central pipe of the suction pad shall be the suction house which in turn shall be connected to the vacuum pump.

Ø  When the pump is started, vacuum will be created between the top cover and filter pads.

Ø  Excess water from the concrete will be taken into the vacuum pump tank and discharged through a pipe away from fresh panel.

Ø  The first finishing operation shall be done by floating with the skim floater attached with a disc.

Ø  The second finishing operation shall be troweling with skim floater attached with the troweling blades.

Ø  Troweling is to be continued till the smooth surface finish is achieved without floater marks.

Ø  Brooming shall be done to achieve rough surface.

Ø  Curing arrangement shall be done for the period of 7 to 10 days by covering with hessian cloth.

Ø  The contraction / sawed joints to be formed at every 3.0 mt to 3.0 mt distance (max.) by grooving with mechanical saw.

Ø  The contraction / sawed joints Shall be carried out as soon as concrete is ready to accept the saw cut.

Ø  The width of 5 mm and depth of the groove sawed joint should be 25 mm.

Ø  The joints should be filled with Bitumen or any other suitable material.

Ø  Applying Non Metallic Non Color Floor Hardener sprinkled over green concrete and trowel to acquire broom finish. @ 3.5 Kg/ Sq. mt.  for car parking area and 7.0 Kg/ Sq. mt.  for Ramp area or as per project specification.