miscellaneous works- kvel

8/8/2019 Miscellaneous Works- Kvel

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Vacuum Dewatered Flooring

Mr. Kandavel Raja P


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Its a special type of concreting in which water is expelledfrom concrete which reduces the capillary pores and

increases the early strength of the concrete. This process

of expulsion of water from concrete increases its density,water impermeability & resistance to abrasion. This process

of concreting used in industrial flooring, parking areas etc..


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TOOLS AND EQUIPMENTS

Trowels Leveling Trowels

Straight Edge Sprit Level

Dumpy Level Measuring Tape

Gum Boot Hammer

Wheel Barrow Guide channel

Vacuum Dewatering machine

Suction mat & Filter pad

Power Trowel

Floor Vibrator / Vibrator


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SAFETYTOOLS

Hand Gloves Concrete Boots

Industrial Pins


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VDF Concrete Preparatory works

All the latest GFC drawings should be available.

Different Levels for Soil, Soling & PCC has to be worked out

based on the slope if any and marked in all the columns for

reference.

Incase of Backfilled soil, the surface should be compacted

layer by layer so that it can take further load without failure

Ensure the proper consolidation of the sub grade.

Electrical / Plumbing Lines to be laid & Checked.


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VDF Concrete Preparatory Works

Soling has to be laid as required and filled with Quarry Dust

A layer of LDPE Sheets is to be provided over the sub grade

and then PCC of thickness as per drawing is laid and cured for

min 3 Days

This PCC Creates a leveled sub strata which will facilitate easy

and proper laying of reinforcement works.


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VDF Concrete Preparatory Works

Expansion Joints to be provided at the junction of existing

structure like columns, Retaining walls etc..

It has been to provided to allow the VDF concrete to work

Structural Expansion joint is also to be provided


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VDF Concrete Preparatory works

In case of any openings / Drains, Angles or Krebs

withA

ngles has to be placed.Execution plan has to be made considering of vehicle

movement, avoid more preparatory works.


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VDF Concrete Execution

PCC Area should be cleaned & free from soil particles

It has been suggested a LDPE Sheets to be provided over the

PCC surface based on site condition.

Reinforcement has to be placed with Cover blocks as per

drawings.

Button Marks / Bull fixing has to be done at required intervals.

Guard rails / Channels has to be placed rigid at the sides of the

bays keeping the top at required Finish level.

Shuttering has to be done to avoid slurry leakages.


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Specified grade of concrete has to be poured with the slump of

100mm 10mm.

Cube Samples to be taken as per BIS Norms

Concrete has to be leveled & Compacted by using Pocker / Needle

Vibrators. Compaction is very essential especially at the edges of the

bays

Essential to combine this vibration with surface/ screed vibration.

The Dewatering Process Starts immediately after surface

vibration.


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Vacuum equipment comprising of 3 equipment, Suction mat

top cover, Filter Pad & Dewatering Pump.

Filter Pads are placed on the Fresh Concrete leaving about 4

inches of concrete exposed on all the sides.

The Top cover is then placed on the Filter pads and rolled out

till it cover the strip of exposed concrete on all sides.

The Top cover is then connected to the Dewatering Pump

through a suction hose and the pump is started.


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The dewatering operation takes approx. 1 min per centimeter

thickness of the Floor.

The Dewatered concrete is compacted and dried to such an extent

that it is possible to walk on concrete without leaving any footprints.

Finishing Operation will be done by using Floating Disc. This ensures

after mixing the sand & Cement particles, further compaction & closing

the pores on the surface.

Trowelling is done with trowelling blades in order to further improve

the wear resistance, minimize dusting & obtain Smoother Finish.


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Finishing Operation will be done by using Power Floating

It comprises two steps

Power Float Disc. This ensures proper leveling, further compaction &

closing the pores on the surface.

Power Troweling is done with troweling blades in order to further

improve the wear resistance, minimize dusting & obtain Smoother/

Mirror Finish.


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Loading or Stepping on

concrete should be avoided,

before initial set of finished

concreteTouch up with mortar should

be avoided which will be peal off

as and when it is loaded

Heavy Vibrations should beavoided in the vicinity of the

VDF Area


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VDF Concrete Grooves on the Floors

A Groove of 3mm thick &

60mm deep has to be made on

the Floor

It should be made after 10 hrsor before 48 hrs of finishing.

The grooves at internal can be

left open & External has to be fill

by bitumen.It Acts as an Expansion Joint /

Control Joint


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VDF Concrete - Benefits


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VDF Concrete Benefits

Through the vacuum treatment, it is possible to reduce the water

content in the concrete by 15 25% which greatly increases the

compressive strength.

Thus, by lowering the water/ cement ratio, the tendency of

shrinkage and subsequent cracking is greatly reduced.


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Thus by removing excess water from concrete, the concrete attains

its high density which results greater durability compared to the

ordinary concrete.

The operational convenience offers, can be very simply put as

pouring concrete having higher water/ cement ratio giving excellent

workability and removing the excess water immediately after surface

vibration, resulting in a zero slump concrete.


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Saving in cement since the compressive strength of the pavement is

increased giving flexibility to adopt either leaner mix or design a slab

of lesser thickness giving the required strength.

Very high output exceeding 100 200 sq. meters. in a day (depending

upon the configuration of Vacuum De watering System and other site

conditions like concrete mixing and pouring speed).


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Single panel without joints up to 100 sq. meters. (depending on

design specifications)

Very high splitting strength.

Monolithic, Shrinkage free pavements.

Controlled and uniform surface finish.


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Finished surface of VDF


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EQUIPMENTS


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Check List for on - site Inspection

Sl

NO

ITEM YES NO Remarks

1.

2.

3.

4.

5.

.

Name, date and number of the

drawing

PRE - VDF CHECKS

Has the surface been cleaned,

rammed and well compacted?

Have the guiding channels been

placed according to the vibrator plate

length?

Are the guiding channels rigid?

Has the slope been maintained as per

the requirements?

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6.

7.

8.

9.

10.

11.

12.

13.

Are the required tools available?

CHECKS DURING VDF

Is the concrete as per design mix?

If the area is too large ,has it been dividedaccordingly, to do concreting alternatively?

Has the concreting been done evenly and

leveled with vibrating machine?

Has the sucking mat been spread evenly to

facilitate maximum withdrawal of water?Is the pump pressure maintained constant

throughout?

Has the sucking mat been spread evenly to

cover any undulations?

Has the floating started immediately afterspreading of mortar?

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14.

15.

16.

17.

18.

Has the floating been done evenly?

Has the drying process been done along with

Floating to get a mirror finish?

POST-VDF CHECKS

Has curing been done ,either with a curing

compound or7 days of curing?

Have the guiding channels been removed

carefully without damaging edges of concrete

after24 hours?Is the finished floor, level?

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MESH FIXING


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Have you ever noticed a crack in between the door

Frames & the Masonry / concrete walls?

WHY?


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DEFINITION & PURPOSE

Due to different coefficients of thermal expansion of

concrete and block masonry, cracks may develop at their

junction, after plastering is completed. This can beprevented by fixing GI expanded metal rolls (rhombus

shaped mesh) of desired width over these junctions.


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S/N NAME USE

1. Hammer To drive the nails into the walls

2. Masons trowel To apply mortar on the expanded

mesh.3. Safety goggles To protect the eyes from flying

debris

4. Safety gloves To protect the hands during nail

fixing5. Measuring tape To measure any distance

6. Hammer drilling machine

To drill holes in concrete elements

Expanded Metal Fixing - Tools


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1. Hammer 2. Mason Trowel



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3. Safety goggles 4. Safety Gloves



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5. Measuring Tape 6. Hammer Drilling

Machine



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PROCESS


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1.Nail rhombus mesh rolls over the blockwork and

concrete junctions with steel nails/ wooden plug and

nails.


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2. This strip has to be plastered and cured for minimum of 3

days before the entire wall is plastered.


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3. fixed over the junction with 1 lay wise nails & GI washer

of20

mm round of1mm thick.

The nails shall be driven into the RCC beams/columns after

drilling a hole and over brick/block masonry directly. The nails

shall be staggered and folded to secure the mesh reinforcement.


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4. Cement mortar 1:3 proportion shall be laid over the mesh to a

thickness to curb the mesh and not exceeding plastered wall

thickness and imprint shall be made over it to create bond withthe plastering to be done. This will be cured for three days prior

to commencing plastering.


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INSPECTION METHODOLOGY

Ensure metal meshes are properly stretched and nailed

with GI square washer, with sufficient overlap.

Plastering on these surfaces to be done precisely with

no protruding surface/edgesEnsure right width of plastering mesh has been used

depending On the height of adjustor course.

Establish if proper curing has been done.

Inspection to be done at the joints to ensure no cracksat joints/plaster..


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Check List for on - site Inspection

Sl NO ITEM YES NO Remarks

1.

2.

3.

4.

Name, date and number of the

drawing

PRE - EXECUTION CHECKS

Has the area been prepared forexecuting the work?

Has the packing between beam

/column and top most level of

blockwork complete?

Has hacking been done on the beam?

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5.

6.

7.

8.

9.

10.

Is the mesh of the required size and

thickness?

Are the required tools and safety equipments

(scaffolding) available?CHECKS DURING EXECUTION

Is the mesh evenly distributed between the

beams and blockwork?

Is the mesh provided throughout the length of

the wall?If Overlapping has to be done, has an overlap

of 10cms been provided?

POST-EXECUTION CHECKS

Is the mesh rigid?

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CORNER BEAD FIXING


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Corner beads are fixed at all exposed edges of walls where

plastering is to be done. It helps to protect the corner from

breaking or chipping off due to minor impacts.A

lso, itgives a good finished surface after plastering and painting.

CORNER BEAD FIXING


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TOOLS AND EQUIPMENTS

S.N NAME USE

1. Masons Trowel To apply the mortar for the corner beads

2. Spirit level To check the verticality of the corner bead after they arefixed.

3. Measuring Tape For distance measuring purpose

4. Plum bobs To check the verticality of the corner bead after they arefixed.

5. Aluminium straightedge

To check the straightness of the corner bead.

6. Measurement box To measure the quantities of aggregates on volumetricbasis

7. Spade For mortar mixing

8. M S Sheet For mortar mixing


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CORNER BEAD


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PROCESS


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Metal corner beads to befixed before internal

plastering to maintain

vertical levels.

CORNER BEAD


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Corner beads shall be initially

fixed over plaster dabs in

neat cement plaster paste

on both sides of the

corner bead. Place the

straight edge against both

sides of the bead to checkthe straightness .Also

Plumb bob shall be used

to ensure vertical plumb.

CORNER BEAD


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The curved edge of the bead should project the finished surface ofplaster slightly to form a smooth external curve . After completingthe alignment after 48 hours of curing the bead shall be filled with 1:2cement sand mortar ,and cured for 3 days


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Ensure the corner bead is inplumb, use spirit levels andplumb bob along with bull

marking.


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Ensure the corner bead is

well packed with absolutely

no gaps.

Ensure the Cement Mortar is

cured for min 3 days

Ensure the Corner bead is

flawless with no cracks or

dents around the installed

bead.



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CheckList for on - site Inspection

SlNO

ITEM YES NO

Remarks

1.

2.

3.

4.

Name, date and number of thedrawing

PRE - EXECUTION

CHECKS

Has the area been prepared forexecuting the work?

Has the bull marking been done?

No damages on the cornerbeads?

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5.

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7.

8.

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10.

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Is the block work at right angles?

Are the required tools and safety equipments

(scaffolding) available?CHECKS DURING EXECUTION

Is the corner bead plumb?

Is the packing between corner beads and

blockwork done with rich cement mortar 1:2?

POST-EXECUTION CHECKSIs the button mark and corner beads in line

and at right angles?

Has curing been done for 3 days?

Are the corner beads rigid?

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