Quantities of cement, Fine aggregate and Coarse aggregate required for 100 Cu. Feet compact, Mortar or Concrete. Assumption – Voids in sand 40% broken stone 45% Specific gravity of Cement = 3.1


WATER
In Gailons per bag
Cement in bags
Sand Dry Cu.ft.
FINE AGGREGATE
Normal Mix
Water/cement ratio (by weight for minimum consistency)
Sand moist (bulking 20%) cu.ft.
Coarse Age: Broken stone cu.ft.
Cement
Fine aggregate
Coarse aggregate
1
1
--
25
2.8
57.5
69.0
82.8
--
1
1 ½
--
28
3.1
46.5
84.0
101.0
--
1
2
--
30
3.3
39.5
94.0
113.0
--
1
2½
--
35
3.9
33.5
100.0
120.0
--
1
3
--
40
4.4
29.0
105.0
126.0
--
1
4
--
53
5.9
22.8
110.0
132.0
--
1
6
--
.70
7.8
16.3
118.0
142.0
--
1
8
--
.2
10.0
12.7
122.0
147.0
--
1
1
2
.30
3.3
31.9
38.4
46.1
76.4
1
1½
3
.42
4.7
22.9
41.2
49.5
82.4
1
1½
3½
.48
5.3
20.6
41.2
49.5
82.4
1
2
2
.42
4.7
24.5
59.0
70.5
59.0
1
2
3
.50
5.5
20.5
49.2
59.0
73.8
1
2
3
.53
5.9
19.0
46.1
55.5
79.8
1
2
4
.55
6.1
17.75
42.7
51.2
85.4
1
2 ¼
3½
.55
6.1
18.25
49.3
59.2
76.7
1
2½
3½
.57
6.3
17.55
52.6
63.1
73.8
1
2½
4
.60
6.6
16.5
49.5
59.5
79.2
1
2½
5
.65
7.2
14.7
44.0
52.9
88.0
1
3
4
.65
7.2
16.35
55.2
66.2
73.8
1
3
5
.69
7.7
13.35
49.6
59.5
82.6
1
3
6
.75
8.3
12.5
44.9
53.9
89.8
1
4
8
.95
10.5
9.6
46.1
55.5
92.2


Also known as 2.2:2:4 No allowance made in table for waste.
For gravel aggregate decrease cement by 5% fine aggregate by 2 cu.ft. and coarse aggregate in proportion to find aggregate as given in the mix.

Approximate Quantity of Surface Water carried by Average Aggregates
Approximate Absorption of Aggregates
Very wet sand
¾ to gal. per c.ft.
Average sand
1.0 % by weight
Moderately wet sand
About ½ gal. per cu.ft.
Pebbles and crushed limestone
1.0 % by weight
Moist sand
About ¼ gal. per cu.ft.
Porous sandstone
7.0 % by weight
Moist gravel or crushed rock
About ¼ gal. per cu.ft.
Trap rock & granite
0.5 % by weight
*the coarser the aggregate, the less free water
Very light & porous aggregate may be as high as 25% by weight