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HOW TO CALCULATE THE CEMENT & AGGREGATE QTY FOR CONCRETE

take the ratio 1:1.5:3
cement =1
sand =1.5
metal =3
So what is the ratio we want to mixing 1+1.5+3=5.5
Volum of wet cement concret is 1.54 to 1.57
unit weight of cement bag is 1440 kg/cum
one bag of cement = 50/1440 = 0.034722 cum

SOLUTION : CEMENT = 1.54/5.5 =0.28
=0.28/0.0347 = 8.069 ( 8 bags)
one bag of cement =50 kg X 8.069 = 403.45 kgs.

SAND solution =0.28 X 1.5 = 0.42 Cum
1.5 is the mixing proportion
METAL SOLUTION = 0.28 x 3 = 0.84 cUM.
3 is the mixing proportion
1 Cum cement concrete is 1:1.5:3 ratio

cement = 403.45 kgs.
sand = 0.42 Cum.
metal = 0.84 Cum.

HOW TO CALCULATE CEMENT & SAND QTY FOR PLASTERING

10 feet= 3.05m

area of plaster = 3.05 x 3.05 = 9.3 m2
(convert thickness of plaster into m divide by 1000)
volume of plaster = 9.3 x (10/1000) = 0.09 m3
quantity of cement = 0.09/1+5 =0.09/6 = 0.02 m3
as cement comes in bags of 50 kg therefore volume of one
bag cement = o.0347 m3 (exact)
(or it may be taken 0.034 or 0.035 m3)

no. of cement bags = 0.02/0.0347 = 0.58 bags (almost 1 bag
of cement required for plaster )

quantity of sand = 0.02 x 5 = 0.10 m3

this is exact calculation
you can add 30% extra for wastage etc.

HOW TO CALCULATE CEMENT, SAND & BRICKS FOR BRICK MASONRY

Consider Brick Masonry for 1 cum with 1:5 ratio mix

1). Brick calculation
take brick size =200mmx100mmx100mm
convert in meter =0.2mx.1mx.1m
total volume of brick= .2x.1x.1=0.002 cum

calculate the numbers of brick for 1cum = 1cum/0.002cum= 500 numbers of bricks.

2). cement calculation
the ratio of cement mortar =1:5
sum =1+5=6
total dry mortar requried for 1 cum brick masonary=.30cum
so,
cement = (.30x1)/6= 0.05 cum
convert in KG=.05x1440=72KG
convert in cement bag= 72/50=1.44bag.

sand calculation
sand =(.30x5)/6=.25cum
convert in kg =.25x1440=360Kg.
to convert in cum
sand = .3*quantity of sand(5)/total of ratio
= .255 for one cum 

My green building project during my college days (2010)

ELEVATIONS DESIGNS By Mr. Siva Subbiah

Fig 1 : Kerala architecture type individual villa

Fig 2 : Indian latest trend individual villa

Fig 3: Individual villa suitable for panchayat approval

Fig 4 : G + 2 rental type homes

Fig 5 : Individual small size villa front elevation

 

REBAR NOTES TO SITE ENGINEERS

Following are the general points to remember for civil site engineers to make the construction work easier while monitoring quality of construction related to reinforcement work,

• Lapping is allowed for the bars having diameters more than 36 mm.
• Chair rod maximum spacing is 1.00m (or) 1 no per 1m2
• For dowels rod minimum of 12mm diameter should be used.
• Chairs minimum of 12mm diameter should be used. 
• Longitudinal reinforcement not less than 0.8% and more than 6% of Cross C/S 
• Minimum bars for square column is 4 no’s and 6 no’s for circular column. 
• Main bars in the slab shall not be less than 8mm (HYSD) or 10mm (main bars) and the distributors not less than 8mm and note more than 1/8 of slab thickness.

• Minimum thickness of slab is 125mm ()

• 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 36mm.

• Water absorption of bricks should not be 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