Civil Information

Civil Engineering

Weight for Materials
Material lb/cft kg/cu.m.
Aluvial ground-undistributed 100 1600
Asbestos, felt 9 150
Asphalt flooring 137 2200
Ballast stone 100 - 120 1600 - 1970
Bamboo 23 370
Bitumen 65 1040
Brass 534 8550
Bricks : Common Burnt Clay 100 - 120 1600 - 1920
Sand Cement 115 1840
Sand Lime 130 2080
Brick Ballast 75 1200
Brick dust (surki) 63 1010
Brick masonry 120 1920
Cement : Ordinary and Aluminous 90 1440
Rapid Hardening 80 1280
Cement Concrete plain : Aerated 16 260
Brick Aggregate 115 1840
Stone Ballast 140 2240
Cement Concrete-reinforced with 1% steel 148 2370
with 2% steel 150 2420
with 3% steel 160 2580
Chalk 100 - 120 1600 - 1920
Clay : Dry compact 90 1440
Damp, compact 110 1760
Weight for Materials
Material lb/cft kg/cu.m.
wet, compact 130 2080
Coal 55 - 70 880 - 1120
Concrete with brick aggregate and lime mortar 120 1920
Cuddapash Slabs 170 2720
Earth : Dry, loose 80 1280
Dry, compact 97 1550
Moist, loose 90 - 100 1440 - 1600
Diy, compact 100 - 115 1760 - 1840
Glass : Crown 157 2510
Common 158 2530
Fint 191 3060
Plass glass 172 2750
Gravel 100 - 125 1600 - 2000
Gunmetal 548 8780
Iron; Pig 450 7200
Greycast 445 7130
white-cast 473 - 481 7580 - 7720
Wrought 480 7700
Kerosene 51 820
Lime freshly burnt 60 960
Limestone-crushed 80 - 90 1280 - 1440
Lime-slaked 40 640
Mortar : Cement 130 2080
Lime 110 1760

FINENESS MODULES

The Fineness Modules of an aggregate is obtained by adding the Percentages by weight of material retained on a range of nine selected sieves and dividing the result by 100, as illsutrated in the Table below.

Serial No. Sieve Total percentage retained by weight
B.S. Sieve No. Tyler. Sieve No. Sand Coarse Aggregate
1 100 100 100 100
2 52 48 80 100
3 25 28 60 100
4 14 14 40 100
5 7 8 20 100
6 3/16" 4 0 100
7 3/8" 3/8" 0 80
8 3/4" 3/4" 0 50
9 11/2" 11/2" 0 0
Fineness Modulus = Sum of percentages / 100 300 / 100 = 3.0 730 / 100 = 7.3
are for fine Aggregate

The Fineness Modules of an aggregate is obtained by adding the Percentages by weight of material retained on a range of nine selected sieves and dividing the result by 100, as illsutrated in the Table below.

Table: Recommended mixes for Different Concrete Construction

Type of work Concrete Mix Ratio Max. size of aggregates (mm) Water for dry aggregates (liter)* Water for aggregates condition from dry to moist batch (liter)* Water for best consistency (liter)*
Small precast work, fence posts, poles, garden furniture and other work of very thin sections 1:2:2 16 20 15 to 16 Soft
Storage tanks, cisterns, sewers, well knerbs, watertight work, and columns or other structural parts subjected to high stresses 1:2:3 20 25 19 to 22 Medium
Reinforced concrete work, floor slab, beams, columns, arches, stairs etc 1:2.5:3.5 20 32 23 to 27 Medium or soft
Ordinary floors, footpaths, drive ways, steps, roads, pavements 1:2.5:3.5 20 23 20 to 23 Stiff
Building and basement walls, silos, sills, lintels, machine foundations subject to vibration, bridges, dams, piers, etc exposed to action of water and frost foundation concrete for masonry walls 1:2:4 40 30 23 to 26 Stiff or Medium
Culverts, retaining walls, compound walls, ordinary machine bases, etc. 1:3:5 40 34 26 to 30 Stiff or Medium
Mass concrete for heavy walls, lean concrete for levelling course of RCC foundations 1:3:6 63 36 30 to 32 Medium