Top 5 tips for civil engineering must know - Civil Experiences

Civil engineer must know this tips to prepare go into field work in site of construction. i cover topic chair, stirrup, tie, slab, tesing cube,brick..

Must Know tips for civil engineering

Tip 1:- Chair Spacing

What is the maximum chair spacing?

Maximum Spacing between to chair is 1 meter

What is a chair?

The chair is a reinforcement bar peace of special shape for providing maintain the proper space between  two-layer (top layer and bottom layer) of slabs reinforcements

Chair reinforcement use to keep reinforcements at the right position in the element Because the designer set reinforcement at the optimum position to safeguard from corrosion, fire and also an economical point of view

That is done by either using wire or plastic chairs, or little blocks of concrete

Tip 2:- Number of stirrups

A stirrup is a closed-loop element of reinforcement bar, which has the main function of holding the main reinforcement bars at right position together in a reinforced concrete element of beam/columns

The main use of stirrups is better to manage the shear capacity in the building element 

What is the difference between the stirrup and lateral tie?

Stirrups are used for shear capacity and torsional reinforcement and have many different sections based on the need. ... 

Ties are typically used in compression members like columns and can be spaced apart

Nos. = (clear span / spanning) + 1

Clearspan is a distance between the first bar to last bar or length of span excluding outer most covers of both side

Spanning is a distance between one bar to the first bar near to next reinforcements bar

Tip 3:- Minimum thickness of the slab

Normally not less than 5 inches or 125 mm 

After it depends on the structure design of the construction building

You can refer to my article about the design of one-way slab design and two-way slab design

Tip 4:- Dimension tolerance of cube 

Dimension tolerance of cube Is " + or - 2 mm "

Interview question 

Why cube size is 150 x 150 x 150 mm or 100 x 100 x 100 mm?

Compresion testing cube is normally 150 x 150 x 150 mm or 100 x 100 x 100 mm
Size does not matter but if we use a larger size cube for testing then we need a testing machine which capacity in tons and has larger pressure for testing cube  and during the time of failure particle of the cube is behaving like a bullet and chances of damage and hurt people 

Tip 5:- Brick

The compressive strength of brick is 3.5 N/mm2

The density of brick 1600-1900 kg/m3

Extra Tip:- lapping 

Lapping not providing if reinforcements bars is 32 mm or more in size

For the full article about lapping ( link )

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