100 Technical terms for Civil Engineers- Must Know

Civil Engineering technical terms

Technical terms for Civil Engineers are important to know when it comes to use in the site work. these terms are important for improving the long life of any structure.  These are very useful for the students who want to qualify for the interview. These technical terms are important for civil engineering people who can apply the basic ideas to build their houses. Just read it thoroughly and you’ll get a lot of knowledge. 

Technical terms for Civil Engineers


      1.  Weight of 1 cement bag = 50 kg

      2. Density Of Cement = 1440 Kgs/ m3

      3. Numbers of Cement Bags in 1  m3=28.8

      4. Cement more than 3 Months cannot be used for construction

      5. The water comment ratio should be between 0.45 to 0.60 % of the volume



    6. Water absorption should not be more than 15 % in 1st Class Brick

    7. The compressive strength of the brick is 3.5 N/mm2

    8. Weight of the Steel bar is Calculated using D2/162 Kg/m where D is the Diameter of the bars

           in mm  

    9. The Number of bricks required for 1  m3 = 550 

   10. Standard size of the brick = 19  X 9 X 9   all in cm 

    11. The slope of stairs should be between 25 – 40 degree

    12. The riser in stairs in between (150 mm to 200 mm) and trade (250 mm to 300 mm)

    13. Brick masonry curing should be 10 days 



    14. Grade of Concrete Denote Cement: Sand: aggregate ( in M20  is 1 : 1.5 : 3)

    15. The concrete can be lifted to 50 m height if using the Concrete Pump.

    16. The Curing Period of RCC is 28 Days 

    17. Stirrups in the Beam and Ties in the Column are provided to handle the shear force and to

          keep longitudinal bars in position.

    18. IS 456:2000 is the code of practice For PCC and RCC 

    19. Lintel Thickness = 15 cm or 0.15 m

    20. Lintel should be Provided at 2.4 m in case of brick wall

    21. Maximum Free fall of the Concrete allowed is 1.5 m

    22. Vibration in freshly made concrete is done to remove the air and Bubbles in

            the concrete mix

    23. Concrete should be used within 30 minutes to get a good results

    24. Concrete curing duration must be at least 7 Days in the case of ordinary Cement 


Column and Slab 

   25. Minimum diameter of the bar used in Slab = 10 mm

   26. At the Bottom of the Plinth minimum diameter used is 12 mm

   27. The Transverse Reinforcement Provide  in Column is  TIE 

   28. The Transverse Reinforcement Provided in the Beam is  STIRRUPS.  

   29. M 20 Grade concrete is generally used in construction of Slab (1:1.5:2)

   30. The Concrete Cover in the Column should not be less than 40 mm.

   31. Minimum Thickness of RCC Slab = 0.125 m or 5 inches

   32. Starter in column thickness should be between 100 to 200 mm

    33. Lapping of the bar should not be provided at the end of the support

    34. Development length should be provided in plinth and top beam

    35. The washroom slab should not be less than 7 feet

    36. The minimum depth of the beam should not be less than 9 inch

    38. Thickness of wall plaster is 12 mm, 15 mm, 20 mm, and 25 mm

Steel Bars 

    39. Lapping of Bar not allowed  if the diameter of the bar is more than 36 mm

   40. DL Means Development Length 

   41. C/C Means Centre to Centre Distance 

   42. Density of steel is 7850 Kgs/ m3

   43. Minimum Number of Bars in a Square or Rectangular Column is 4 and the Minimum

          The number of Bars in the Circular Column is 6 

   44. DPC Thickness should not be Less than = 2.5 cm 

   45. The standard Length of the Steel Bar From the factory is 12 m 

   46. At top of the Plinth minimum diameter used is 10 mm

   47. If the steel bar does not have Ribs on the surface, don’t use them

   48. IS 800:2000 is the code of Practice for General Steel 

   49. Hook Length for the stirrups is 9 D for one side (D is Diameter of the bar)

   50. Number of Stirrup in Beam = [ (Clear Span/ (c/c)) + 1]

    51. In steel reinforcement Binding wire required 8 Kg Per MT

    52. Lapping is not allowed for the bar having a diameter of more than 36 mm 

    53. All reinforcement shall be free from rust, mud, oil, coat of paint, or any

            other substance. 

     54. Use 50 D formula for Lapping length where D is the diameter of a bar in mm

     55. RCC column legs should be the length of 9D where D is the diameter in mm



   56. 3 4 5 formula is used in Layout to make 90 degree angle in Plotting

   57. Heron’s formula is used to find the Land area of the irregular plot

   58. BBS stands for bar bending schedule

   59. The minimum waist of staircase should not be less than 36 inches or 3 Feet

   60. Minimum height of handrail should not be less than 34 inch

   61. Waist of staircase should not be less than 4 inch

  62. Minimum depth of foundation for 1 story is 1 m

  63. Minimum size of RCC footing is 2 X 2 Feet  

  64. For every 15 m2 square of Shuttering 1 L of oil is consumed

  65. If length of a bar is 12 m with a 10 mm diameter than weight of the bar is 7.40 kg

  66. Density of steel is 7850 Kgs/ m

  67. Number of bars = (Length of opposite side spacing / Centre to Centre distance) +1

  68. Deduct the concrete cover from all sides of the tie and find out the length of the story


  69. 75 grams of nails is used for 1 m2  shuttering

  70. Volume Of cement Bag = 1.25 CFT and 0.0347 m

  71. Minimum Height of kitchen and Bathroom is 3 m

  72. Use single mech of reinforcement for residential and double for commercial building 

  73. New work (2 coats)  1.25 Liter Per 10 m2 or 8 m2/86 SQ FT of coverage per 1 Lit 

  74. Old work (one coat) 0.75 Liter per 10 m2 or 13.33 m2 /143 SQ FT of coverage per 1 Lit

  75. Recommended curing should not be less than 10 days 

  76. Plaster curing 7 Days.  



  77. 1 Gallon (US) = 3.178 Liter

  78. 1 kilonewton (KN)= 101.97 Kgs

  79. Maximum Chair spacing in the slab is 1 Meter

  80. M25 grade concrete is mostly used for the construction of the foundation

  81. Minimum space should be 12″ Between Door and window 

  82. Average Ceiling height Min- 210 cm,  Standard- 240 cm, Good- 260 cm

  83. Cement should be stored in dry place 

  84. Cement bags should not be stacked more than 10 bags in Height 

  85. Cement Bags should be above minimum 30 cm of the ground

   86. On lapping stirrups should be placed closely

   87. In the beam top portion steel bars lapping should be provided after the L/3 distance

   88. In beam tension steel bars Lapping should be in L/8 Distance

   89. To convert wet concrete into dry, wet volume should be multiplying with 1.5

   90. Normally We consider 3-5 % Concrete as wastage while estimating of material

   91. For chairs, Minimum of 12 mm diameter bars to be used

   92. Main bars in Slabs should not be less than 10 mm

   93. Bearing capacity of soil should be maximum compared to design load/structure load

   94. Plain Cement concrete (PCC) is a type of concrete used on a Member only when

           tensile force is not acting on it.

   95. Dead load is self weight of structure

   96. The weight of 1st Class Clay brick should be 3.85 Kgs

   97. Specific Gravity- Cement-3.16 g/cm3, Sand- 2.65 g/cm3, Brick-2 g/cm3

   98. Washroom wall Thickness should not be less than 6″

   99. Vibration in freshly made concrete is done to remove the air bubbles in Concrete.

  100. Cement is made by pulverizing clinkers by calcinating raw materials such as Lime (CaO), Silica (SiO2), Alumina (Al2O3), and Iron Oxide (Fe2O3).



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