Example 2: Design a concrete mix using ACI method for casting a reinforced concrete slab with thickness of 12 cm and min clear spacing between steel reinforcement of 3 cm. the mean 28 days compressive strength is 30 N/mm. The water required for a slump of 10 cm is 205 3 kg/m . Given: Specific gravity of fine and coarse aggregate (SSD) =2.7 3 Bulk density of coarse aggregate (dry and compacted) = 1600 kg/m Absorption of coarse aggregate = 0.5% and for sand = 1%. The required adjustment to mix proportion if the moisture content of sand is 0.5% and for coarse aggregate = 2%. Sieve size (mm) Cumulative % retained Compressive strength N/mm² 40 35 30 25 Table 2 Relation between compressive strength and w/c ratio w/c ratio by wt. Normal concrete 0.42 0.47 0.54 0.61 5 2 Air entrained concrete 0.39 0.45 0.52 2.36 13 Table 1 Sieve analysis of sand 0.6 0.15 42 89 1.18 24 Density of concrete kg/m³ 2310 2345 2380 2410 2445 Table 3 first estimation of density of fresh concrete and the volume of coarse aggregate/unit volume of concrete Bulk vol of oven dry rodded coarse agg/m³ of concrete for F.M of sand 2.4 2.6 2.8 3 0.59 0.57 0.55 0.53 0.66 0.64 0.62 0.6 0.71 0.69 0.67 0.65 0.75 0.73 0.71 0.69 0.78 0.76 0.74 0.72 Max size of agg 12.5 2245 20 40 0.3 80 50 0.075 6
Example 2: Design a concrete mix using ACI method for casting a reinforced concrete slab with thickness of 12 cm and min clear spacing between steel reinforcement of 3 cm. the mean 28 days compressive strength is 30 N/mm. The water required for a slump of 10 cm is 205 3 kg/m . Given: Specific gravity of fine and coarse aggregate (SSD) =2.7 3 Bulk density of coarse aggregate (dry and compacted) = 1600 kg/m Absorption of coarse aggregate = 0.5% and for sand = 1%. The required adjustment to mix proportion if the moisture content of sand is 0.5% and for coarse aggregate = 2%. Sieve size (mm) Cumulative % retained Compressive strength N/mm² 40 35 30 25 Table 2 Relation between compressive strength and w/c ratio w/c ratio by wt. Normal concrete 0.42 0.47 0.54 0.61 5 2 Air entrained concrete 0.39 0.45 0.52 2.36 13 Table 1 Sieve analysis of sand 0.6 0.15 42 89 1.18 24 Density of concrete kg/m³ 2310 2345 2380 2410 2445 Table 3 first estimation of density of fresh concrete and the volume of coarse aggregate/unit volume of concrete Bulk vol of oven dry rodded coarse agg/m³ of concrete for F.M of sand 2.4 2.6 2.8 3 0.59 0.57 0.55 0.53 0.66 0.64 0.62 0.6 0.71 0.69 0.67 0.65 0.75 0.73 0.71 0.69 0.78 0.76 0.74 0.72 Max size of agg 12.5 2245 20 40 0.3 80 50 0.075 6
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
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Transcribed Image Text:Example 2:
Design a concrete mix using ACI method for casting a reinforced concrete slab with
thickness of 12 cm and min clear spacing between steel reinforcement of 3 cm. the mean 28
days compressive strength is 30 N/mm. The water required for a slump of 10 cm is 205
3
kg/m.
Given:
Specific gravity of fine and coarse aggregate (SSD) =2.7
3
Bulk density of coarse aggregate (dry and compacted) = 1600 kg/m
Absorption of coarse aggregate = 0.5% and for sand = 1%.
The required adjustment to mix proportion if the moisture content of sand is
0.5% and for coarse aggregate = 2%.
Sieve size (mm)
Cumulative % retained
Compressive
strength
N/mm²
40
35
30
25
Table 2 Relation between compressive
strength and w/c ratio
w/c ratio by wt.
Normal concrete
0.42
0.47
0.54
0.61
5
2
Air entrained
concrete
0.39
0.45
0.52
2.36
13
Table 1 Sieve analysis of sand
0.6
0.15
42
89
1.18
24
Density of
concrete
kg/m³
2310
2345
2380
2410
2445
0.3
80
Table 3 first estimation of density of fresh concrete and
the volume of coarse aggregate/unit volume of concrete
Bulk vol of oven dry rodded coarse
agg/m³ of concrete for F.M of sand
2.4
2.6
2.8
3
0.59
0.57
0.55
0.53
0.66
0.64
0.62
0.6
0.71
0.69
0.67
0.65
0.75
0.73
0.71
0.69
0.78
0.76
0.74
0.72
Max
size of
agg
12.5
20
25
40
50
0.075
6
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