Design Mix:
M10 ( 1 : 3.92 : 5.62)
Cement : 210 Kg/ M3
20 mm Jelly : 708 Kg/ M3
12.5 mm Jelly : 472 Kg/ M3
River sand : 823 Kg/ M3
Total water : 185 Kg/ M3
Fresh concrete density:
2398
Kg/M3
M20 ( 1 : 2.48 : 3.55)
Cement : 320 Kg/ M3
20 mm Jelly : 683 Kg/ M3
12.5 mm Jelly : 455 Kg/ M3
River sand : 794 Kg/ M3
Total water : 176 Kg/ M3
Admixture : 0.7%
Fresh concrete density:
2430
Kg/ M3
M25 ( 1 : 2.28 : 3.27)
Cement : 340 Kg/ M3
20 mm Jelly : 667 Kg/ M3
12.5 mm Jelly : 445 Kg/ M3
River sand : 775 Kg/ M3
Total water : 185 Kg/ M3
Admixture : 0.6%
Fresh concrete density:
2414
Kg/ M3
Note: sand 775 + 2% moisture, Water 185 -20.5 = 164 Liters,
Admixture = 0.5% is 100ml
M30 ( 1 : 2 : 2.87)
Cement : 380 Kg/ M3
20 mm Jelly : 654 Kg/ M3
12.5 mm Jelly : 436 Kg/ M3
River sand : 760 Kg/ M3
Total water : 187 Kg/ M3
Admixture : 0.7%
Fresh concrete density:
2420
Kg/ M3
Note: Sand = 760 Kg with 2% moisture (170.80+15.20)
M35 ( 1 : 1.79 : 2.57)
Cement : 410 Kg/ M3
20 mm Jelly : 632 Kg/ M3
12.5 mm Jelly : 421 Kg/ M3
River sand : 735 Kg/ M3
Total water : 200 Kg/ M3
Admixture : 0.7%
Fresh concrete density:
2400
Kg/ M3
Note: sand = 735 + 2%, Water = 200-
14.7 = 185.30,
Admixture = 0.7%
M40 ( 1 : 1.67 : 2.39)
Cement : 430 Kg/ M3
20 mm Jelly : 618 Kg/ M3
12.5 mm Jelly : 412 Kg/ M3
River
sand : 718 Kg/ M3
Water Cement ratio
: 0.43
Admixture : 0.7%
Note: Sand = 718 + Bulkage 1%
M45 ( 1 : 1.58 : 2.26)
Cement : 450
Kg/ M3
20 mm Jelly : 626 Kg/ M3
12.5 mm Jelly : 417 Kg/ M3
River
sand : 727 Kg/
M3+ Bulkage 1% Water Cement ratio : 0.43
Admixture : 0.7%
M50 ( 1 : 1.44 : 2.23)
Cement : 450 Kg/ M3
20 mm Jelly : 590 Kg/ M3
12.5 mm Jelly : 483 Kg/ M3
River
sand : 689 Kg/ M3 + Bulkage 12%
Water Cement ratio
: 0.36 (188 Kg)
Admixture : 1.20%3
Micro silica : 30 Kg
Super flow
6.7% of cement
WEIGHT OF MATERIALS
50 mm J bolt : 751 No’s / 52 Kg
40 mm J bolt : 883 No’s / 54 Kg
2” nails : 385 No’s / Kg
3” nails : 118 No’s / Kg
4"
nails : 72 No’s / Kg
Binding wire : 170 rings /Kg
SIMPLEX FORMULA:-
U = (N /L) x {(W x H) / (1 + S)} x Sq.rt {(L/50)}
|
U N |
= = |
Ultimate load in tones Number of blows |
|
L |
= |
Pile length in feets |
|
W H |
= = |
Weight of hammer in tones Height of fall in feet. |
|
S |
= |
Set for 1 blows in Inch |
Safe load
= (ultimate load/ 2.5)
Factor of safety = 2.5
10 blows = below 10 MM
Thread couplers:- (For Column lapping)
Couplers for reinforcing bars 20 mm to 28 mm crimped sleeve
Slump IS 456
Lightly reinforced 25 – 75 mm
Heavily reinforced 75 – 100 mm
Trench fill (insitu & Tremie) 100 – 150 mm
(For Termie vibrator not
required)
Durability:-
Cement content and Water Cement ratio.
Accuracy of measuring equipment in batching plant.
Cement
: + 2% Aggregate
: + 3% Admixture
: + 3% Water : + 3%
Mixing time : 2 minutes for one mixing.(site Mixing)
Form work:-
In C/S
for columns & Beams deviation is
= + 12mm more (or) - 6mm less in size
In footing plan = + 50
mm
more (or) – 12
mm
less size
In depth
= + 0.05 D
(specified thickness). Reinforcement:-
For effective depth D < 200mm = + 10mm For effective depth D
> 200mm = +
15mm For Cover to reinforcement = + 10mm Maximum freefall of concrete = 1.50 m height.
TOLERANCE ON DIA IN LENGTH:-
0-25mm = +
0.5 %
25-35mm = +
0.6 %
35-50mm = +
0.8 %
TOLERANCE ON WEIGHT PER METRE:-
0-10mm = +7%
10-16mm = +
5%
16 and above = +
3%
TOLERANCE FOR CUTTING LENGTH :-
|
A) |
When the specified length is not given |
= + 75mm (or) – 25 mm |
|
B) |
When the min. length is specified |
= + 50 mm (or) – 0 mm |
GENERAL:-
Lapping is not allowed for the bars having diameters more than 36 mm.
Chair spacing maximum spacing is 1.00 m (or) 1 No per 1 Sq.m
For dowels rod minimum of 12 mm dia should be used.
Chairs minimum of 12 mm dia bars to be used.
Longitudinal reinforcement
not
less than 0.8% and
more than 6% of gross C/S.
Minimum bars for square column is 4 No’s and 6 No’s for circular column.
Main
bars in the slabs shall not be less than 8 mm (HYSD) or 10
mm
(Plain bars)
and
the distributors not less than 8 mm and
not more than 1/8 of slab thickness.
Minimum thickness of slab is 125 mm
Dimension tolerance for cubes +
2 mm.
Free fall of concrete is allowed maximum to 1.50m.
Lap slices not be used for bar larger
than 36 mm.
Water absorption not more than 15 %.
PH value of the water should not be less than 6.
Compressive strength of Bricks
is
3.5 N / mm2
In steel reinforcement binding wire required is 8 kg
per
MT
In soil filling as per IS code 100 sqm should take 3 sample for core cutting test
DENSITY OF MATERIALS:-
Weight of Bricks = 1600-1920 Kg/M3
Weight of Block work = 1920 Kg/M3
Weight of R.C.C = 2310 – 2700 Kg/M3
CURING:-
Super Sulphate cement : 7 days
Ordinary Portland cement OPC : 10
days
Minerals & Admixture added cement : 14
days
STRIPPING TIME ( De-Shuttering):-
For columns, walls, vertical form works : 16-24 hrs
Soffit formwork to slabs : 3 days (props to be refixed after removal) Soffit to beams props : 7 days props to refix after removal. Spanning up to 4.50m : 7 days
Spanning over 4.50m : 14 days Arches spanning up to 6m : 14 days Arches spanning over 6m : 21 days
CUBE SAMPLES:-
1 – 5 M3 : 1 No.
6 – 15 M3
: 2 No’s
16 – 30 M3 : 3 No’s
31 – 50 M3 : 4 No’s
Above 50 M3 : 4 + 1 No of addition sample for each 50
M3
TEST RESULTS OF SAMPLES:-
The test results of the samples shall be the average of the strength of three
specimens.
The individual variation should not be more than +
15 % of the average.
If more the results of the sample are invalid.
COMPRESSIVE STRENGTH:-
3 days : 45 %
7 days :
67 – 70 %
14 days
: 85 %
28 days : 100%
+
APPROXIMATE COST PER SQ.FT (MANTRI PROJECT)
HIGH RISE BUILDING:-
Structure
= 979 / Sft
(Concreting, Block work, Plastering, Flooring, Dado, painting)
Electrical works (Modular switches)
= 172 / Sft
Plumbing (P.H.E)
= 93 / Sft
Fire Fighting
= 13
/ Sft Lift
= 34
/ Sft Common Area
= 94
/ Sft External development (Landscape, road works, drains etc.,) = 87
/ Sft
TEST FOR SILT &
CLAY:-
Take 200 ml measuring cylinder fill sand up to 100ml mark
Add 150ml of water and shake well
Allow it to settle for 3 hrs.
Measure the total height and
height of clay.
Calculate the clay and
silt in total sand
Clay and Silt should not exceed
3% by weight (or) 8-10% by volume
For crushed sand Clay and Silt should not exceed
15% by weight
ORGANIC IMPURITIES:-
Don’t dried the specimen before testing
Take 250 ml measuring cylinder.
Add 75 ml of water with 3% of Sodium Hydroxide. Fill sand layer to 125 ml
Make the volume up
to 200ml by adding more of sodium hydroxide solution
Shake well allow it to stand for 24
hrs
If the solution becomes darker than straw yellow colour then the sand has to be
tested for further by casing mortar cubes for 7 & 28
days is not less than 95%.
If the solution is lighter or just straw yellow colour the sand can be used for concreting without any further test.
QUANTITIES REQUIRED:-
Plastering (CM 1:3) = 1.50 bags / 10 m2
Plastering (CM 1:5) = 1.05 bags / 10 m2
Ceiling Plastering (CM 1:3) = 48 kg /
10 m2
Brick work (CM 1:5) = 86 Kg / 10
m3
Brick work (CM 1:6) 9”
thick = 80.64 Kg / 10 m3
Brick work (CM 1:3) 4½” thick = 15.46 Kg / 10 m3
Lime for white washing = 10 Kg/100
m2
Painting = 10 ltr/ 100 m2
Distemper 1st coat = 6.5 Kg / 100 m2
Distemper 2nd coat = 5.0 kg / 100 m2
Snowcem 1st coat = 30
Kg
/ 100 m2
Snowcem 2nd coat = 20 Kg / 100 m2
Paint ready mixed one
coat = 10 ltr / 100 m2
Weathering Course = 7.68 Kg / m2
Flooring
= 8.10 kg / m2
Pressed tiles for weathering course (CM 1:3)= 7.68 Kg / 10 m2
Granolithic floor finish = 8.10 Kg / 10 m2
WATER CEMENT RATIO:-
|
M20 |
= |
0.55 |
|
M25 |
= |
0.50 |
|
M30 |
= |
0.45 |
|
M35 |
= |
0.45 |
|
M40 |
= |
0.40 |
SPACING OF BARS:-
Provide the dia of the bar, if the dia of the bar are equal.
Provide the dia of the larger
bar, if the dia are unequal.
5mm more than the nominal maximum size of the coarse aggregate.
CONVERSION:-
1 Acre = 4046.72 m2
1 cent
= 40.4672 m2
COVER TO MAIN REINFORCEMENT:- Column : 40 mm (D>12mm)
Column : 25 mm (D= 12mm) Beam : 25 mm
Slab : 15 mm (or) not less than dia of the bar.
Footing : 50 mm
Sunshade (Chajja) : 25 mm
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