Plain Cement Concrete
(PCC)
1 Name of Work & Description
PCC
(Plain Cement Concrete) : This is a sub-base structure of any foundation to
ease the foundation work like Shuttering, Reinforcement, concreting, etc. PCC
work is required to maintain the bottom level of a foundation in a level. Below PCC
we need to do excavation, cleaning, rubble soling, compaction, plum concrete, etc. PCC can prevent termites as well as riotous insects, etc. below PCC we
need to do anti-termite treatment, to prevent all insects like Mouse, ant,
frog, etc.
PCC is
not a reinforced structure; this is just a part of sub-base structure to work
easily before foundation.
Types of Plain Cement Concrete
1 Cast in
situ PCC
2 Ready
mix PCC
3 Hand
Mix PCC
4
Screeding
5 slab
Cushioning
6 Lime
Concrete
7 Topping
on Slab
8 Plum
Concrete
2 IS Code No.
Plain and
Reinforced Cement Concrete IS Code: IS456:2000
Code of
Practice for laying in-situ Cement Concrete Flooring: IS2571:1970
Methods
of tests for aggregate for concrete: IS: 2386
Compressive
strength test for cement mortar cubes: IS: 2250
Methods
of sampling and analysis of concrete: IS: 1199
Specifications
for fine & coarse aggregate from natural sources for concrete: IS: 383
3 The Drawing Needs to Read.
As we
discussed earlier PCC is a base structure which not taking the load, so no separate
drawing will be provided by any agency, in all drawing, there is only mentioned
thickness, offset of PCC and grade of concrete.
But sometimes
in schedule drawing there are details motioned as well as sizes and thickness are
also given in the schedule. (As per Picture).
Following the drawing needs to study before start PCC Work.
1 Footing
Sectional Drawing
2 Plinth
Sectional Drawing
3 Layout
of Foundation
4 Footing
layout and Schedule.
5 Level
Drawing.
4 Location of Work
Plain
Cement concrete is the mandatory base before starting any foundation, the following are some locations where we are found PCC Work.
1 PCC
below footing
2 PCC
below plinth beam
3 PCC
below Raft
4 Floor
PCC
5 PCC
Below Tremix
6
Screeding on Slab
7 Plum
Concrete was more level difference in-ground.
5 Standard Procedure of Work (Step by Step)
Following
procedures need to follow before start PCC Work.
1
Checking of Excavation Level and Foundation depth, depth of PCC, plinth Level,
etc.
2
Checking of Hard Strata after Excavation.
3 Removal
of all loose material.
4
Cleaning of the excavated area before start PCC.
5 Marking
of Corner Point with fixing of a rod, and marking of top-level of PCC on it.
6 Fixing
of shuttering ply side as per the size given in drawing, or keep offset to the foundation at least 150mm to smooth working space.
7 Keep The top-level of PCC is uniform. If the excavated ground is not is level then do plum
concrete after discussing it with the RCC consultant. But keep PCC in level.
8 Fill
Concrete as per the given design mix. Which can be generally given in drawing is
M10 & M15.
9 Keep the thickness of the PCC uniform which is nearing 150mm or 100 mm as per given in
drawing.
10 The next day remove shuttering and regular curing to be done.
11 Now
PCC is Ready to Marking of Footing/Foundation and works further according to
drawing.
6 Checkpoints
PCC
Checkpoints are as follows
1
Excavation level
2 Plinth
Top-level
3 Depth
of Foundation
4
Cleaning of Loose Material
5 Marking
of Outer size of PCC
6
Shuttering of PCC
7
Thickness of PCC
8 Grade
of Concrete
9 Quality
of Concrete
10 Curing
7 Equipment and Machinery
Cast in
situ PCC required following Material
1 0.5
Bag/1 Bag Manual or semi-automatic Concrete Mixer.
2 Weight
batcher
3 Wheel Borrow
4 Shovel
& Ghamela
5 Thapi,
6 Line Dori
7
Measurement Tape
7 Auto
level and staff.
8 Measurements and Quantity Survey
Plain
Cement Concrete is measuring in 2 units as Square Meter and Cubic Meter.
Following
are the procedures to take and write the measurements of PCC.
If Size
of Footing is 1500mm X1500mm and thickness is given 150mm,
Then we
can calculate two types of measurements.
1 Square Meter:
Size of
Footing: 1500mm X1500mm
One side
length of PCC: (1500mm +150mm (Offset) + 150mm (Offset)): 1800mm
Size of
PCC: 1800mm X 1800mm: i.e.:1.800mX1.800m
Area of PCC: 3.240 Square Meters
2 Cubic Meters:
Size of
Footing: 1500mm X1500mm
Size of
PCC (Including Offset):1800 mm X 1800mm: 1.800mX1.800m
Thickness
of PCC: 150mm
Concrete Quantity of Footing PCC: 1.800mX1.800mX0.150: 0.486 Cubic Meters
9 Checklists
Checklist for Plain Cement Concrete is called Pour Card.
1 Excavation Level, Plinth Top Level, Thickness of PCC is Checked.
2 All Loose Material Removed and Cleaned the PCC base surface.
3 Marking is Done including offset to foundation
4 Formwork is cleaned and oiled
5 Formwork free from holes and gaps.
6 Formwork size is as per drawing.
7 Formwork is inline-level and plumb.
 |
| Footing PCC |
10 Quality Tests
Compression
test of Cube
Testing
of Cement
Testing
of Aggregate
11 On-site Experiences
Importance of Plain Cement Concrete: We executed a
industrial renowned beverages company project, before that we are assuming PCC
is not as much important structure, but after working on this site we
understood the importance of PCC, because there is some cold room made, and we
did all the PUF panel (polyurethane foam) work below concrete, now if you got
to visit this site you can see this normal, but below Tremix we did a lot of work
and PCC and trimix are cushioning to those hidden things.
Mr. Shankar
Team
CBEC India
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ReplyDeletethank you very much for this brief information, could tell us about the thickness of PCC Under RCC work 15cm in the bed of the canal how much thickness PCC is need under 15cm RCC work.
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