Skip to main content

Basic knowledge for CivilEngineering to know before entering into job



Follow this for more:

1.Common misconception is that all civil engineers will be site engineers which is wrong. There will be civil engineers in the following functions too.


  • Planning
  • Contracts  
  • Quantity survey
  • Tendering and bidding
  • Design
  • Quality Control,


2. When it comes to site execution,

Every civil engineer must know that the supervisors working under them are not their slaves.

We earn respect only when we show some respect to our juniors level engineers or supervisors.

When safety department in-charge says something, civil engineers need to follow to avoid any unwanted circumstances (like accidents or death in the site).

Don't waste the scrap. Recycle it and reuse it.

Ex: You can even use unwanted cut steel bars for barricading purpose.

3. When it comes to project execution,

Every civil engineer's ultimate aim should be completing the project within the stipulated time without any delay and within the specified budget

  • Minimum thickness of slab is 125 mm.
  • Water absorption should not be more than 15 %.
  • Dimension tolerance for cubes + – 2 mm.
  • Compressive strength of Bricks is 3.5 N /mm2
  • Maximum Free fall of concrete allowed is 1.50 m.
  • In soil filling as per IS code for every 100 sqm 3 sample for core cutting test should be taken.
  • Electrical conduits shall not run in column
  • Earth work excavation for basement above 3 m should be stepped form.
  • Any back filling shall be compacted 95% of dry density at the optimum moisture content and in layers not more than 200mm for filling above structure and 300 mm for no structure
  • A set of cube tests shall be carried out for each 30 cum of concrete / each levels of casting / each batch of cement.
  • Water cement ratio for different grades of concrete shall not exceed 0.45 for M20 and above and 0.50 For M10 / M15 contractor
  • For concrete grades M20 and above approved admixture shall be used as per mix design requirements.
  • Cement shall be stored in dry places on a raised platform about 200mm above floor level and 300mm away from walls. Bags to be stacked not more than 10 bags high in such a manner that it is adequately protected from moisture and contamination.
  • Samples from fresh concrete shall be taken and at least a set of 6 cubes of 150mm shall be prepared and cured. 3 Cubes each at 7 days and 28 days shall be tested for compressive strength. The test results should be submitted to engineer for approval. If results are unsatisfactory necessary action/rectification/remedial measures has to be exercised.


Water used for both mixing and curing shall be clean and free from injurious amounts of oils, acids, alkalies, salts, sugar and organic materials or other substances that may be deleterious to concrete or steel. The ph shall be generally between 6 and 8.
Cement shall be tested for its setting.

1. The initial setting time shall not be less than 30 minutes.
2. The final setting time shall not be more than 10 hours.

  • Slump IS 456 
  • Lightly reinforced 25 – 75 mm
  • Heavily reinforced 75 – 100 mm
  • Trench fill (insitu & Tremie) 100 – 150 mm (For Tremie no need of vibrator)
  • Curing Days Required 
  • Super Sulphate cement : 7 days
  • Ordinary Portland cement OPC : 10 days
  • Minerals and Admixture added cement : 14 days

There are many other things but I felt these are most important.
Labels:

Comments

Post a Comment

Popular posts from this blog

Hardy slab and where it use

  HARDY SLAB :- These kind of slabs are generally seen in Dubai and China. This  slab is constructed by hardy Bricks. Hardy bricks are hollow bricks and made up of concrete Hollow blocks are used to fill portions of the slab thickness it saves the  amount of concrete and hence the own weight of the slab is reduced. This kind of slab has a more thickness when compared with the conventional one. The thickness of hardy slab is 0.27m. The method of installing Hardy slab is different from normal  and it is clearly explained below: This is a one of the types of concrete slabs. The dimensions of Hardy brick is 40cm x 20cm x 20cm The process of execution is as follows: Step 1   : Formwork is arranged and then shutters are fixed on the formwork. Step 2  : Hardy blocks are placed on the shutter with one brick gap on the entire shutter. Step 3  : The gaps between the bricks are called as rib. Reinforcement is provided in a form of beam within the ...
4 comments
Read more

Waffle slab and where to use

  WAFFLE SLAB :- Waffle slab is a reinforced concrete roof or floor containing square grids with deep sides. This kind of slab is majorly used at entrance of hotels, Malls, Restaurants for good pictorial view and to install artificial lighting. This a  type of slab where we find hollow hole in the slab when the formwork is removed.  Firstly PVC trays (pods) are placed on shuttering then reinforcement is provided between the pods and steel mesh is provided at top of the pods and then concrete is filled. After concrete sets the formwork is removed and PVC pods are not removed. This forms hollow hole in it in which hole is closed at one end. The concrete waffle slab is often used for industrial and commercial buildings while wood and metal waffle slabs are used in many other construction sites. This is a one of the types of concrete slabs. Where to use? A waffle slab is a type of slab with holes underneath, giving an appearance of waffles. It is usually used where lar...
3 comments
Read more

Mix design calculation for M50 grade Concert

CONCRETE MIX DESIGN EXAMPLE – M50 GRADE CONCRETE Grade Designation = M-50 Type of cement = O.P.C-43 grade Brand of cement = Standard best quality cement Admixture = Sika [Sikament 170 ( H ) ] Fine Aggregate = Zone-II Sp. Gravity Cement = 3.15 Fine Aggregate = 2.61 Coarse Aggregate (20mm) = 2.65 Coarse Aggregate (10mm) = 2.66 Minimum Cement (As per contract) =400 kg / m3 Maximum water cement ratio (As per contract) = 0.45 Concrete Mix Design Calculation: – 1. Target Mean Strength = 50 + ( 5 X 1.65 ) = 58.25 Mpa 2. Selection of water cement ratio: Assume water cement ratio = 0.35 3. Calculation of water content: Approximate water content for 20mm max. Size of aggregate = 180 kg /m3 (As per Table No. 5 , IS : 10262 ). As plasticizer is proposed we can reduce water content by 20%. Now water content = 180 X 0.8 = 144 kg /m3 4. Calculation of cement content: Water cement ratio = 0.35 Water content per m3 of concrete = 144 kg Cement content = 144/0.35 = 411.4 k...
1 comment
Read more