Must-Have Knowledge for Civil Engineers | Civil Basic Knowledge

Drawing Points to Remember for Civil Site Engineers QA /QC Points to Remember for Civil Site Engineers Billing / Site Points to Remember for Civil Site Engineers Read more

Drawing Points to Remember for Civil Site Engineer

Survey Drawings Location Drawings Plan Passing Drawing Site Plan / Layout Plan Elevation Drawing Section Drawing Structural Drawing Masonry Drawing Read more

QA /QC Points to Remember for Civil Site Engineer

Quantity of Concrete in the Work, m3 Number of Samples 1-5 1 6-15 2 16-30 3 31-50 4 51 and above 4 Plush one Additional sample for each additional 50 m3 or part thereof Read more

2. Dimension tolerance for cubes + – 2 mm.

Lightly reinforced 25 – 75 mm Heavily reinforced 75 – 100 mm Trench fill (insitu & Tremie) 100 – 150 mm (For Tremie no need of vibrator) Read more

4. Various Density For site required

Cement=1440kg/m 3 Brick=1682kg/cum or 1920kg/m 3 Steel = 7850kg/m 3 Water = 1000kg/m 3 R.C.C = 2500kg/m 3 (5% STEEL) P.C.C = 2400kg/m 3 Wood = 1100kg/ m 3 Loose sand = 1442 kg / m3 Dry sand = 1602 kg / m3 Packed sand= 1682 kg / m3 Wet sand = 1922 kg / m3 Aggrgate = 1200-1750 kg / m3 Read more

5. Water absorption

Coarse Aggregates = Max water absorption limit for coarse aggregates in any climatic condition should not be more than 2%. Fine Aggregates = Range varies from 0.3–2.5%. Max permissible limit of fine aggregates is 3%. Brick = Water absorption shall not be more than 20% by weight up to class 12.5 and 15% by weight for a higher class. Read more

6. Maximum Free fall of concrete allowed is 1.50 m

8. Back Filling

Exposure Plain Cement Ratio Reinforced Cement Concrete IS 10262 Minimum Cement Content W/C Ratio Grade Minimum Cement Content W/C Ratio Grade Mild 220 0.60 300 0.55 M20 Moderate 240 0.60 M15 300 0.50 M25 Severe 250 0.50 M20 320 0.45 M30 Very Severe 260 0.45 M20 340 0.45 M35 Extreme 280 0.40 M25 360 0.40 M40 Read more

10. Cement Stored

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. Read more

11. Compressive Strength

Grade of Concrete Minimum compressive strength N/mm2 at 7 days Specified characteristic compressive strength (N/mm2) at 28 days M15 10 15 M20 13.5 20 M25 17 25 M30 20 30 M35 23.5 35 M40 27 40 M45 30 45 Read more

Classification of Bricks Based on Compressive Strength

The common burnt clay shall be classified on the basis of average compressive strength as given in table. Read more

Bricks Class Designation Average compressive strength of Bricks Not less than (N/mm2) Less than (N/mm2) 350 35 40 300 30 35 250 25 30 200 20 25 175 17.5 20 150 15 17.5 125 12.5 15 100 10 12.5 75 7.5 10 50 5 7.5 35 3.5 5 Read more

12. Concrete has Two setting types

Initial Setting time – 30 min Final Setting time – 10 hrs Read more

13. De-Shuttering time of different RCC Members

RCC Member De-shuttering time For columns, walls, vertical form-works 16-24 hrs. Soffit formwork to slabs 3 days (props to be refixed after removal) Soffit to beams props 7 days (props to refixed after removal) Beams spanning up to 4.5m 7 days Beams spanning over 4.5m 14 days Arches spanning up to 6m 14 days Arches spanning over 6m 21 days Read more

14. Curing Period

The curing Period of RCC is 28days . Read more

Billing / Site Points to Remember for Civil Site Engineer

Columns = 45 x d Beams = 60 x d Slabs = 60 x d Read more

2. Chair Spacing for Bar Bending

Chair spacing maximum spacing is 1.00 m (or) 1 no per 1 m2. Read more

3. Chairs a Minimum Dia in Bar Bending

Chairs a minimum of 12 mm diameter bars to be used. Read more

4. Clear Cover to Main Reinforcement:

Footing Cover = 50 mm Raft Foundation.top = 50 mm Raft Foundation. Bottom/Sides = 75 mm Strap Beam = 50 mm Grade Slab = 20 mm Column = 40 mm Shear Wall = 25 mm Beams = 25 mm Slabs = 15 mm Flat Slab = 20 mm Staircase = 15 mm Ret. Wall = 20/ 25 mm on Earth Water Retaining Structures = 20/30 nn Read more

5. Weight of Rod Per Meter Length:

6mm = 0.222Kg/m 8mm = 0.395 Kg/m 10mm = 0.616 Kg/m 12mm = 0.888 Kg/m 16mm = 1.578 Kg/m 20mm = 2.466 Kg/m 25mm = 3.853 Kg/m 32mm = 6.313 Kg/m 40mm = 9.865 Kg/m Read more

6. Plaster Deduction

No deduction shall be made for openings less than 0.5 sq m in area, and no addition shall be made reveals, jambs, soffits, sills, etc. of these openings. No deduction shall be made for ends of joists, steps, etc. not exceeding 0.5 sq m in area. For openings exceeding 0.5 sq m but not exceeding 3 sq m and when both faces are plastered with the same type of plaster each deduction shall be made for one face only, and the other face shall be allowed for jambs, soffits, and sills which shall not be measured. For openings exceeding 0.5 sq m but not exceeding 3 sq m and when two faces are plastered with a different type of plaster or with one side plaster and other side pointed, deduction shall be made on one side of chaukhat (frame)of the door an window on which the width of jambs and reveals is less than the other side, and no deduction shall be made for other side. In the case of openings of the area above 3 sq m, each deduction shall be made for both faces of openings, and the jambs and sills shall be measured and added. In taking a measurement of jamb, soffits, and sills, chaukhat (if any) shall not be deducted. Read more

Basics of Civil Engineering What Is Concrete | 31 Different Types of Concrete What is Salt Concrete Finish | How to Create a Salt Finish What Is Sand Blasting | Concrete Sand-blasting Equipment | Key Benefits What Is Standard Proctor Test & his Detail | Procedure Standard Proctor Test Read more

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