3.
Select design slump (see Table 2-4 on page 2-6).
Maximum
4 inches
Minimum
1 inch
4.
Select w/c ratio.
a.
Strength (see Table 2-1 on page 2-3)
0.46
b.
Durability and watertighness (see Table 2-2 on page 2-4):
Durability
0.50
Watertightness
0.50
c.
Choose the lowest of the above. Design w/c ratio =
0.46
5.
Select water content and percent of air (see Table 2-2):
a.
Water content 295 lbs
b.
Percent of air (entrapped or entrained)
6.0 percent
6.
Calculate cement content.
7.
Volume of gravel (see Table 2-6 on page 2-14). 18.9 cf
(FM = 2.50; MSA = 1 inch)
Weight of gravel = BUW x loose volume = 95 x 18.9 = 1,795.5 lbs
8.
Volume of sand.
a.
Convert to absolute volume:
(4)
Air = percent of air x 27 = 0.06 x 27 = 1.62 cf
(5)
PV = summation =
20.68 cf
b.
Absolute volume of sand = 27 - PV = 27 - 20.68
= 6.32 cf
c.
Weight of sand = absolute volume x SG x 62.4 = 6.32 x 2.65 x 62.4 = 1,045 lbs
EN5466
2-30
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