- Height of parapet wall should be =
**1 m.** - Thickness of DPC is =
**2.5 cm.** - Height of building =
**3.15m.** - Height of window =
**2.1 m.** - One bag of cement =
**1.25****ft**^{3} - Weight of one cement bag is =
**50****kg.** - Minimum thickness of slab =
**125****mm(5")** - No. of cement bags/m
^{3}=**28.8****bags** - Lintel thickness =
**15****mm** - Lintel is provided @
**2.4 m**in case of brick wall. - Minimum diameter of bars used in slab =
**8****mm.** - Minimum diameter of bars used in column =
**12mm.** - Minimum diameter of bars used in dowels =
**12mm** - Maximum diameter of bars in slab =
**( 1/8) x thick of slab** - Maximum chair spacing = 1
**meter** - Dimensional tolerance of cube =
__+__2**mm** - Maximum water absorption of first class brick =
**15 % of its dry weight** - Initial setting time of cement = 30
**min** - Final setting time of cement = 10
**hours** - DPR = Detailed Project Report
- Unit weight:
- RCC =
**25 kn/m**^{3}= 25000 N/m^{3} - PCC =
**24 kn/m**^{3}= 24000 N/m^{3} - Steel =
**7850 kg/m**^{3} - Brick =
**1600 kg/m**^{3}= 16 kn/m^{3} - Soil =
**1800 kg/m**^{3}= 18 kn/m^{3} - 1 Gallon =
**3.78 liters** - Minimum no. of bars
- For square columns =
**4 bars** - For circular columns =
**6 bars** - Standard sand in India is obtained from Ennore Tamil Nandu.
- 1 Yard =
**3 feet** - Weight of steel =
**D**^{2}/162.2 kg/m or D^{2}/533 kg/ft - Size of concrete testing cube =
**150 mm x 150 mm x 150mm** - Concrete cube is filled in
**3 layers.** - Slump cone is filled in
**4 layers.** - Cement should be used with in the
**3 months of manufacturing.** - Minimum thickness of shear wall =
**150 mm.** - Maximum thickness of shear wall =
**400 mm.** - (UTM) Universal testing machine is used for
**compression test of concrete & tensile test of steel reinforcement.** - Minimum curing period:
- 7 days - Normal weather condition
- 10 days - Dry and hot weather condition
- Minimum percentage of steel in column =
**0.8 % of gross area** - Maximum percentage of steel in column =
**6 % of gross area** - Nominal cover
- Footing =
**50mm** - column =
**40 mm** - slab =
**20mm** - beam =
**25 mm** - Least count:
- Compass =
**30' (30minutes)** - Dump Level =5 mm
- Auto level = 5mm
- Theodolite = 20" (20 seconds)
- Air voids left in concrete is called as Honey Combing.
- The transverse reinforcement of column are called ties.
- The transverse reinforcement in beam are called stirrups.
- Minimum hook length =9D, example 9x 10 mm = 90mm
- No. of bricks in m3 = 500 bricks
- No. of bricks in 230 mm brick wall in 1 cubic meter = 496 bricks (including wastage)
- No. of bricks in 115 mm thick wall for 1 square meter = 56 bricks
- 8- 12 kg of binding wire is used per metric tonne of steel.
- Cement ingredients are burnt @ 1400degree c temp.
- 1BHK stands for 1 Bedroom , 1Hall, 1 kitchen.
- Short columns fail in crushing
- Long column fail in buckling
- Intermediate column can fail both in crushing and buckling.
- Tensile strength of concrete = 0.7(sqrt(fck)), fck = 20 N/mm
^{2} - Modulus of elasticity of concrete =EC = 5000 sqrt(fck), fck =10,20,25,30 N/mm
^{2} - Characteristic compression strength of concrete :
- 150mm size cube tested @ 28 days (fck)
- Strength of concrete below which not more than 5 % of test results are expected to fail.
- Ordinary concrete M10 = M20
- Standard concrete M25 = M55
- High strength concrete M60 = M80
- In mixer machine concrete should be mix for 2-3 minute
- Storage of cement:
- Cement should be stored in dry places.
- 200 mm away from floor (in a platform)
- 300 mm away from walls.
- Not more than 10 bags stocked.
- Away from the moisture of chemicals.
- Water absorption for bricks 1st class should be less than 20 percent.
- Water absorption is less than 5 percent for the building stones.
- Factor of safety for steel = 1.15
- Factor of safety for concrete = 1.5
- Young modulus of steel, ES = 2x 10
^{5}N/mm^{2} - Types of steel
- Mild steel Fe250 N/mm
^{2} - HYSD (High steel strength deformed bars)
- Fe 415 N/mm
^{2} - Fy 500 N/mm
^{2}

## Wednesday, June 02, 2021

### Important points for civil engineers

Subscribe to:
Post Comments (Atom)

## No comments:

## Post a Comment