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Thursday, 22 February 2018

Basic Important Question for fresher Interview

                                                 1 M Length steel Rod and its Volume
V=(Pi/4)*Dia x DiaX L=(3.14/4)x D x D X 1 (for1m length) Density of Steel=7850 kg/ cub meter
¨Weight =
¨Volume x Density=
¨(3.14/4)x D x D X1x7850 (if D is in mm ) So = ((3.14/4)x D x D X1x7850)/(1000x1000) = Dodd/162.27

                                                DESIGN MIX:M10
M10 ( 1 : 3.92 : 5.62)
¨ Cement : 210 Kg/ M 3
¨ 20 mm Jelly : 708 Kg/ M 3
¨ 12.5 mm Jelly : 472 Kg/ M 3
¨ River sand : 823 Kg/ M 3
¨ Total water : 185 Kg/ M 3
¨ Fresh concrete density: 2398 Kg/M 3
  
                                                               M20
M20 ( 1 : 2.48 : 3.55)
¨ Cement : 320 Kg/ M 3
¨ 20 mm Jelly : 683 Kg/ M 3
¨ 12.5 mm Jelly : 455 Kg/ M 3
¨ River sand : 794 Kg/ M 3
¨ Total water : 176 Kg/ M 3
¨ Admixture : 0.7%
¨ Fresh concrete density: 2430 Kg/ M 3
                                                                                        M25
M25 ( 1 : 2.28 : 3.27)
¨ Cement : 340 Kg/ M 3
 ¨ 20 mm Jelly : 667 Kg/ M 3
 ¨ 12.5 mm Jelly : 445 Kg/ M 3
¨ River sand : 775 Kg/ M 3
¨ Total water : 185 Kg/ M 3
¨ Admixture : 0.6%
¨ Fresh concrete density: 2414 Kg/ M 3
¨ Note: sand 775 + 2% moisture, Water185 -20.5 =164 Liters,Admixture = 0.5% is 100ml
                                                                                        M30
M30 ( 1 : 2 : 2.87)
¨ Cement : 380 Kg/ M 3
¨ 20 mm Jelly : 654 Kg/ M 3
¨ 12.5 mm Jelly : 436 Kg/ M 3
¨ River sand : 760 Kg/ M 3
¨ Total water : 187 Kg/ M 3
¨ Admixture : 0.7%
¨ Fresh concrete density: 2420 Kg/ M 3
¨ Note: Sand = 760 Kg with 2% moisture(170.80+15.20)
                                                                                        M35
M35 ( 1 : 1.79 : 2.57)
¨ Cement : 410 Kg/ M 3
¨ 20 mm Jelly : 632 Kg/ M 3
¨ 12.5 mm Jelly : 421 Kg/ M 3
¨ River sand : 735 Kg/ M 3
¨ Total water : 200 Kg/ M 3
¨ Admixture : 0.7%
¨ Fresh concrete density: 2400 Kg/ M 3
¨ Note: sand = 735 + 2%,
¨ Water = 200- 14.7 =185.30,
¨ Admixture = 0.7%
                                 M40
M40 ( 1 : 1.67 : 2.39)
¨ Cement : 430 Kg/ M 3
¨ 20 mm Jelly : 618 Kg/ M 3
¨ 12.5 mm Jelly : 412 Kg/ M 3
¨ River sand : 718 Kg/ M 3
¨ Water Cement ratio : 0.43
¨ Admixture : 0.7%
¨ Note: Sand = 718 + Bulk age 1%
                                 M45
¨ M45 ( 1 : 1.58 : 2.26)
¨ Cement : 450 Kg/ M 3
¨ 20 mm Jelly : 626 Kg/ M 3
¨ 12.5 mm Jelly : 417 Kg/ M 3
¨ River sand : 727 Kg/ M 3 + Bulk age 1%
¨ Water Cement ratio : 0.43
¨ Admixture : 0.7%
                                 M50
¨ M50 ( 1 : 1.44 : 2.23)
¨ Cement : 450 Kg/ M 3
¨ 20 mm Jelly : 590 Kg/ M 3
¨ 12.5 mm Jelly : 483 Kg/ M 3
¨ River sand : 689 Kg/ M 3 + Bulk age 12%
¨ Water Cement ratio : 0.36 (188 Kg)
 ¨ Admixture : 1.20%3
¨ Micro silica : 30 Kg





¨ Super flow 6.7% of cement
¨ 1 cubic meter contains 500 bricksThe Standard size of the 1st class brick is 190mmx 90mm x90mm and motor joint should be 10mm thickSo brick with motor=200 x 100 x 100.Volume of
¨ 1st class brick = 0.19 x 0.09 X 0.09 =0.001539cu.m

¨ Volume of 1st class brick with motor =0.2 x 0.1 x0.1=0.002cu.mNo. on bricks per 1cu.m= 1/volume of1st classbrick withmotor=1/0.002= 500 no’s of bricks

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