## Civil Engineering Basic Knowledge

Cement’s intial setting time should be **30 min(Minimum) and 90 min(maximum).**

Final setting time of cement should be**=10 hours**

### What type of test should perform for a road’s improved subgrade sand filling:

1.FM of fine aggregates

2.California bearing ratio

3.Dynamic cone penetration test

4.MDD of fine aggregate

5.Field Dry Density.

### What type of test should perform for earth filling in Embankment with specified soil:

1.Plastisity index.

### What type of test should perform for Concrete Work:

1.Setting time of cement

2.Compressive strength of cement

3.Gradation of Coarse aggregates.

4.FM of fine aggregates.

5.Water absorption of coarse aggregates

6.Loss angels abrasion test

7.Concrete cylinder casting & testing

### What type of test should perform for M.S High strength deform bar

1.Tensile strength,Elongation and unit wt.

What type of test should be perform for Brick work:

1.Setting time of cement

2.Compressive strength of cement

3.FM of fine aggregates

4.Compressive strength of brick

5.Water absorption of brick

6.Efflorescence of brick.

Local sand FM limit should be **0.5 to 0.8**

Toak sand FM limit should be **1.2 to 1.8**

Coarse sand or shylhet sand FM should be **2.5**

At improved sub grade **0.5 to 0.8 FM** sand should be used.

1.Ms Flat bar weight determine equation**=0.00785A**

2.Brick require for 1 square meter one brick flat soling**=32nos.**

3.Brick require for 1 squre meter one layer herring bone bond soling**=52nos.**

4.Cement require for 9.3 squre meter neat cement finishing**=1/2bag or 25kg**

5.A head mason can work** 25-30 cum** brick work in a day.

1.Lintel thicknessshould be **15cm.**

2.Parapet wall height should be** 1 meter.**

3.Window height should be **120cm.**

4.D.P.C thickness should be **2.5cm**

5.Plinth height should be **45cm.**

6.Measuremnt of riser should be **15cm.**

7.Building height should be **315 cm**

8.plaster thickness at ceiling should be 6mm.

### Q1:1 cum cement=how much bag?

answer:30 bags.

### q2:1cum khoa=how much brick?

answer=300 nos

q3:1bag cement=0.0347 cum cement.

### Q1:What is the volume of per bag cement?

Answer:1.25 cubic ft

### Q2:what is the weight of per bag cement?

Answer:50kg or 112pb

### Q3:How much water absorb of a brick if the brick take rest for 24 hours in under neath the water?

answer:1/5 or 1/6 of the brick wt.

Q4:what is the mesurement of a brick?answer:9.5in*4.5in*2.75in(without morter)

answer:10in*5in*3in(with morter)

### Q1:What is the weight of a first class brick?

answer:3.85kg

### q2:What is the crushing strength of a first classbrick in per square in?

answer:not less than 1000 pound.

### Q3:What is the tensile strength of a first class brick in per square in?

answer:not less than 3000 pound.

### Q4:Which sand is mostly used for construction in Bangladesh?

answer:Domar sand or Dimla sand.

1.Riser height of a staircase should be **15 cm**

2.A building height should be **315 cm**

3.Plaster thinkness at celling should be **6 mm**

4.Dry volume of a cc work is 3 times greater than wet volume of a cc work.

5.1 cum water weight **=1000kg**

6.At DPC work how much Cem-seal or Impemo require for one bag cement?**=1kg**

7.At DPC work how much Padlo require for one bag cement?**=2.5kg**

8.At brick work the joint thickness between two bricks should be**= 12 mm**

9.The lapping measurement at Compreesion zone should be**=24D(without hook)**

10.The lapping measurement at Tensile zone should be**=40D(Excluding Hook)**

11.One hook length shoulb be**=9D**

12.For crank extra length measurement should be**=0.50d**

13.Stirrup length measurement Equation**=2(A+B)+30 cm**

14.Weight of step of a staircase**=11.5r (r=rise in cm)**

15.MS angle weight determine equation**=0.00785A**

16.MS plate weight determine equation**=7.85t**

17.Before use a brick for brick work how many time the brick should take rest underneath the water?**=2 hours**

18.How much brick require for 1 sqm brick flat soling?**=32 nos**

19.How much brick require for 1 sqft brick flat soling?**=3 nos**

20.How much sand require for 1 sqm brick flat soling?**=0.02 cum**

21.How much brick require for 1 sqm herring bonebond?**=54 nos**

22.How much brick require for 1 sqft herring bonebond?**=5 nos**

23.How much sand require for 1sqm herring bone bond?**=0.03 cum**

24.How much brick require for 1 sqm edging?**=8 nos**

25.Cement require for 1 sqm neat cement finishing?**=3kg**