Skip to main content

Basics to know Concrete grades,clear cover reinforcement, weight of rod

CONCRETE GRADES:
M5 = 1:4:8
M10= 1:3:6
M15= 1:2:4
M20=  1:1.5:3
M25= 1:1:2

CLEAR COVER TO MAIN REINFORCEMENT:
1.FOOTINGS : 50 mm
2.RAFT  FOUNDATION.TOP : 50 mm
3.RAFT FOUNDATION.BOTTOM/SIDES : 75 mm
4.STRAP BEAM  : 50 mm
5.GRADE SLAB : 20 mm
6.COLUMN : 40 mm
7.SHEAR WALL : 25  mm
8.BEAMS : 25 mm
9.SLABS : 15 mm
10.FLAT SLAB : 20 mm
11.STAIRCASE  : 15 mm
12.RET. WALL : 20/ 25 mm on earth
13.WATER RETAINING STRUCTURES :  20/30 mm

WEIGHT OF ROD PER METER LENGTH:

DIA WEIGHT PER METER = D*D/162

6mm = 0.222Kg
8mm = 0.395 Kg
10mm = 0.616 Kg
12mm = 0.888  Kg
16mm = 1.578 Kg
20mm = 2.466 Kg
25mm = 3.853 Kg
32mm = 6.313  Kg
40mm = 9.865 Kg
Labels:

Comments

  1. Bhushan10 May 2021 at 03:49


    This is really informative post for High Alumina Cement

    ReplyDelete
  2. Kanishk Plaster31 January 2022 at 10:59

    Kanish Plasters is India’s trusted gypsum plastering company and has a strong foothold in all major cities. We help builders save on construction time and cost, and are revolutionizing the Indian construction industry. Gypsum Plastering has faster setting time than cement sand plastering. The gypsum walls are paint ready in 4 days compared to 15 days with cement sand plastering. Sand cement plastering needs at least 15 days to reach the inherent properties, whereas gypsum gains its inherent properties within 48 days of application. Gypsum wall plaster gain their total strength within 78 hours.

    ReplyDelete

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