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Things Site Engineers Must Know

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

F soling is specified the soling stones shall be laid at 45° to 60° inclination (and not vertical) with interstices filled with sand or moorum.

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


Cube Samples
1 – 5 M3 : 1 No.
6 – 15 M3 : 2 No’s
16 – 30 M3 : 3 No’s
31 – 50 M3 : 4 No’s
Above 50 M3 : 4 + 1 No of addition sample for each 50 M3.

Things Site Engineers Must Know About Reinforcement and Steel Bars

Check out the Unit Weights and Conversion which will be required on construction site here

We at are thankful to Er Vikrant for submitting this construction site check list which is of great use to all civil engineers.

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Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

If you have a query, you can ask a question here.

74 comments on "Things Site Engineers Must Know"

akhter hussain says:

this is very use full & help full for civil engineers. i realy like it..

mallikarjun says:

I like this

devaraj says:

this is very useful for every civil engineers

shahrukh khan says:

Very. Useful enformation

Engr.Abdullah Tunio says:

Very useful and informative knowledge.

Krishna Raj says:

really very helpful, Thank you Sir/Mam. Try to give more important hints for us.

kavi says:

This is very useful….thank you

Akbar says:


prashanth says:

need to know more details thank you

sivasmart says:

we need to more details about site work” thank you.


deeply thanks, such a classified information relevant to civil

sakthi says:

good useful knowledge

dksshahul says:

we want more information from measurements

Chirag C Doshi says:

I want all detailed basic knowledge of civil engineering like cover
– concrete grade for slab/column/beam/staircase/lift padadi & etc
– open raft
– open footing
– lintle
– reinforcement dia wise
– why we use ring
– what is lapping
– why we use chair breaket
– chajja
– floting beam/column
– basement
– etc

Pls let me know if you know anything of this….?

Chris says:

Thanks for this useful knowledge,we want more from you

deepa says:

really very helpful

bhosale gaurav ,satara says:

Still required more informations .thanks

Saddam Safar says:

It’s very important for every Civil engineer because it is basic things.
Thank you so much

shuhaib kp says:

Very useful mam/sir thank u for your information

irshu says:

Excellent information appreciate civil..great thanks

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