The document provides information on various construction materials including their properties and specifications. It lists the compressive strength and water absorption of different types of bricks. It also provides dimensions of standard bricks and calculations for determining the number of bricks, cement, and sand required for a brick wall of given thickness. Further, it mentions unit weights of various construction materials like concrete, steel, wood, gypsum etc.

1. POSSIBLE INTERVIEW
QUESTION

2.  Senior engineer / project manager
 Site engineer
 Contractor
 Mistri
 Mason / labour
Authorities on a construction site

3.  Compressive strength of bricks:
 First class brick -105 kg/cm2
 Second class brick – 70 kg/ cm2
 Fire brick – 125 kg/cm2
 Water absorption bricks – 16 % to 20 %.
 Weight of brick 3.5 to 5 kg.
 Standard brick size – 190 x 90 x 90 mm
BRICKS

4. Volume (L x W x H) = 1 meter cube.
 Mortar thickness = 8 mm.
 Mortar Ratio = 1:4
 Size of brick = 190 mm ×90 mm ×90 mm. or (0.19 m x 0.09 m x 0.09 m).
 Size of brick with mortar = 198 mm × 98 mm× 98 mm. or (0.198 m x 0.098
m x 0.098 m).
 BRICKS = 526
 CEMENT = 1.5 bags.
 SAND = 7.1 cubic feet.
 Note: These ratios may change by changing the dimension of the mortar
thickness or size of the bricks as well as the mortar ratios 1: 4, 1: 6 etc.
BRICKS

5. 4.5 inch wall thickness = 531 bricks
9 inch wall thickness = 1062 bricks
13.3 inch wall thickness = 1593 bricks

6.  Slope – 25 to 40 as per IS 456-2000.
 No.of.steps : 15 steps max.
tread – 300mm, rise -150 mm
 Volume of cement bag - 0.0347 m3 = 50/1440
 volume(eg: 1:1.5:3 = 5.5 = 1/5.5 *1.57 = 0.285 m3
 standard sand now used in India is obtained from – Ennore
(chennai).
Stair case

7. Concrete details:
 Workability –slump cone test
 Hardened concrete test – compressive test
 M20 – M- mix, 20 char. compressive strength of concrete in
28 days i.e., 20N/mm2
 Unit weight of concrete
 PCC- 24 kN/m3
 RCC – 25 kN/m3
 Minimum Grade of concrete used for RCC – M20.

8.  Unit weight of steel – 78.5 kN/m3
 Minimum reinforcement for circular : 6 no’s
 Minimum reinforcement for Square : 4 no’s
 Calculation of weight of steel bar- D2/162
 Function of stirrups in beam – resist SF.
Steel

9. Types :
 OPC -33,43,53
 PPC - 43
Setting time:
 Initial settling time of cement – 30 min(OPC)
 Final setting time -10 hrs (OPC)
 Initial settling time of cement – 10 min(PPC)
 Final setting time – 90 min (PPC)
cement

10.  Load bearing
 Framed structure
Types of building

11.  Pile foundation – SBC less than 24 kN/m3
 Standard height of each floor – 3 m
 Multi storey – 15 m
 Full form of 1 BHK – BED ROOM , HALL , KITCHEN.
 Thickness of plaster – 12 mm
 Mortar b/w the bricks 12 mm
 Slab thickness -150 to 200 mm

12.  Door size – 3.75 ft *7 ft
 Window size – 3,5 ft * 3.5 ft
 Ventilation normal – 2 ft * 2 ft
 Sill level – 3 ft
 Lintel level – 7 ft
 Roof level – 10 ft to 11 ft (residential building)
 Parapet wall – 3m high above the roof.

13.  Shuttering removal timing:
 Side of wall, column and outer side of beam – 24hrs to
48 hrs.
 Beam soffits – 7 days
Shuttering

14.  Maximum spacing b/w the bars in beam – 25 mm.
Least cover
 Footing – 50 mm
 Column – 40mm
 Beam – 25 mm
 Slab – 20 mm
cover

15.  Vertical member
 Support structural load
 Finally to the ground through footings.
 M 10 – 1:3:6
 M15 – 1:2:4 NOMINAL MIX
 M20 – 1:1.5:3
 M25 – 1:1:2
column

16.  TMT BARS – THERMO MECHANICALLY TREATED
BARS.
 High Strength And High Corrosion Resistance.
FIELD TEST OF CEMENT:
 Colour
 Feel Smooth When Rubbish With Hands

17. SHALLOW
SPRED
COMBINED
STRAP
MAT OR RAFT
DEEP
 PILE
 PIER
FOUNDATION

20.  Concrete: 2370 kg/m^3
 Cement: 1440 kg/m^3
 Cement Mortar: 2080 kg/m^3
 Brick: 1600-1920 kg/m^3
 Brick Masonry: 1920 kg/m^3
 Dry Sand: 1600 kg/m^3
 River Sand: 1840 kg/m^3
 PCC: 2240 kg/m^3
 Steel: 7849 kg/m^3
 Cast Iron: 7208 kg/m^3
 RCC 2% Steel: 2420 kg/m^3
 Aluminium: 2739 kg/m^3

21.  Gravel with sand: 1920 kg/m^3
 Crushed Stone: 1600 kg/m^3
 4 inch Brick w/½" mortar: 673 kg/m^3
 8 inch Concrete Block w/½" mortar: 881 kg/m^3
 12 inch Concrete Block w/½" mortar: 1281 kg/m^3
 A. C. Sheet Corrugated: 16 kg/m^3

22.  Teak Wood: 670–830 kg/m^3
 1/4 inch Plywood: 3.47 kg/m^3
 3/8 inch Plywood: 5.18 kg/m^3
 1/2 inch Plywood: 6.93 kg/m^3
 1/2 inch Gypsum: 7.62 kg/m^3
 3/8 inch Gypsum: 10.2 kg/m^3
 Marble: 2560 kg/m^3
 Limestone: 2739 kg/m^3
 Granite Stone: 2460–2800 kg/m^3
 Tar:1150 kg/m^3
 Porcelain: 2400 kg/m^3
 Window Glass: 2580 kg/m^3