31. SETTING
TIME
A. INITIAL
B. FINAL
150 MINUTE
230 MINUTE
Should not :
Be less than 30 Be
less than 540 min
C.S OF
MORTAR
CUBES:
A. 3 DAYS
B. 7 DAYS
C. 28 DAYS
26.02 N/mm2
38.44 N/mm2
54.46 N/mm2
Should not :
Be less than 23 Mpa
Be less than 33 Mpa
Be less than 43 Mpa
32. Grade of concrete 25 N/mm2
Type of cement OPC 53 grade
Maximum size of aggregate 25 mm
Maximum cement content 240 kg/m3
Maximum W/C ratio 0.6
Workability (slump) 50 mm
Exposure condition Moderate
Method of concreting Manual
Degree of supervision Good
Type of aggregate Angular
33. Specific gravity:
Cement
Coarse aggregate
Fine aggregate
3.105
2.61
2.41
Water absorption:
Coarse aggregate
Fine aggregate
0.5
0.1
Free moisture content:
Coarse aggregate
Fine aggregate
nil
nil
34. TYPES OF FINE
AGGREGATE ZONE 2
STANDARD DEVIATION 4
CALCULATION:
Target strength
Selection of water cement
ratio
Water content
Cement content
31.6 N/mm2
0.55
186 litres
35. MIX CALCULATION:
Volume of concrete
Volume of cement
Volume of water
Volume of all in aggregate
Mass of coarse aggregate
Mass of fine aggregate
1 m3
0.190 m3
0.186 m3
0.705 m3
1122.398 kg
662.610 kg
MIX PROPORTION :
Cement
Fine aggregate
Coarse aggregate
1
1.959
3.319
36.
37.
38. DAYS 3 DAYS 7 DAYS 28 DAYS
0%
REPLACEMENT
24.44 N/mm2 31.42 N/mm2 48.8 N/mm2
10%
REPLACEMENT
37.64 N/mm2 50.97 N/mm2 63.55 N/mm2
20%
REPLACEMENT
34.80 N/mm2 40.08 N/mm2 54.22 N/mm2
30%
REPLACEMENT
29.77 N/mm2 36.62 N/mm2 48 N/mm2