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Reinforcement Steel Bars (Rebar)

✅ Unit Weight Formula (Very Important)

Steel bar ka unit weight nikalne ka standard formula:

\text{Unit Weight (kg/m)} = \frac{D^2}{162}

जहाँ D = Dia in mm


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📌 Standard Unit Weight of Steel Bars (kg per meter)

Dia (mm) Weight (kg/m)

6 mm 0.222 kg/m
8 mm 0.395 kg/m
10 mm 0.617 kg/m
12 mm 0.888 kg/m
16 mm 1.580 kg/m
20 mm 2.469 kg/m
25 mm 3.858 kg/m
32 mm 6.318 kg/m
40 mm 9.865 kg/m



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📦 Unit Weight of 12 Meter Long Steel Bar

Dia (mm) Weight (kg) per 12m

6 mm 2.664 kg
8 mm 4.740 kg
10 mm 7.404 kg
12 mm 10.65 kg
16 mm 18.96 kg
20 mm 29.63 kg
25 mm 46.30 kg
32 mm 75.82 kg
40 mm 118.38 kg


(Values almost same as your image)


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🎯 Quick Trick (Site Use):

✔ 8mm bar ≈ 0.4 kg/m

✔ 10mm bar ≈ 0.62 kg/m

✔ 12mm bar ≈ 0.89 kg/m

✔ 16mm bar ≈ 1.6 kg/m

✔ 20mm bar ≈ 2.5 kg/m

✔ 25mm bar ≈ 3.9 kg/m

✔ 32mm bar ≈ 6.3 kg/m

2 months ago | [YT] | 1

The Construction Vlogs

Frooti Full Details.

✅ Working Space Kya Hota Hai?

Working Space wo extra khali jagah hoti hai jo excavation (khudai) ke time PCC, footing aur column ke aas-paas chhodi jaati hai, taaki:

✔ Masons (mazdoor) aasani se kaam kar sakein

✔ Shuttering lag sake

✔ Concrete dalne me space mile

✔ Tools aur workers ko movement ho

Ye directly structure ka part nahi hota—sirf construction process easy karne ke liye rakha jata hai.


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📏 Kitna Working Space Rakha Jata Hai?

Generally:

➤ Each side = 0.3 m to 0.6 m

Aur total dono side milaakar PCC ya footing ki length/width me +0.6 m add hota hai.

Is image me working space = 0.6 m (each side) liya gaya hai.


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📌 Aapke Diye Example Ka Explanation

Volume of Excavation formula:

(L_{PCC} + WS) \times (B_{PCC} + WS) \times (D_{PCC} + D_{Footing} + D_{Column})

Given:

Length PCC = 3.20 m → +0.6 + 0.6

Width PCC = 2.70 m → +0.6 + 0.6

Depth = 0.10 + 0.75 + 3.00 = 3.85 m


So:

(3.20+0.6+0.6) \times (2.70+0.6+0.6) \times 3.85

= 4.40 \times 3.90 \times 3.85 = 66.07 \, m^3


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🎯 Short Definition (Use for Report / Site Work)

Working Space:
“It is the extra space provided around the footing or PCC during excavation to allow easy working operations like shuttering, reinforcement placing, compaction, and concreting.”


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2 months ago (edited) | [YT] | 1