Page 55 - Lecture Notes DCC3113

b. Complete the Marshall form below and determine the optimum bitumen content of the mix design

Stability Flow
Weight (g) Specific Gravity Volume Voids (%) Stiffness
% Bulk (kN) (mm)
Bitumen Volume Refer
Spec. Saturated 3 Bulk Max. Mineral Filled Total Table CORR
Sample. No Surface Air Water (cm ) (Density) Theory Bitumen Aggregate Voids Agg. Bitumen Mix CORR MEAS (Stability)
No Dry (%VMA) (%VFB) (%VIM) Factor
F G H I J K L M N O P Q R S
B C D E B X G (100-B)G 100-I- 100- CORR
(C-E) D/F * 100-J 100(I/L) P X O Q/R
SG BIT SG AG J (100G/H) FACTOR
4.5 1200.8 1195.3 685.9 1161 3.27

1196.4 1193.7 685.9 1100 3.17
1195.7 1192.7 685.4 1150 3.26
AVG 3.2
5.00 1197.9 1194.7 690.7 1191 3.70

1195.8 1192.7 690.2 1163 3.71
1200.5 1197.1 692.4 1151 3.83
AVG 3.7
5.50 1202.8 1199.9 695.2 1321 4.30

1180.3 1176.4 682.7 1298 4.29
1178.6 1174.8 681.2 1239 3.93
AVG 4.2
6.00 1185.0 1182.3 685.8 1163 4.63

1196.0 1191.5 690.6 1135 4.72
1188.8 1184.0 685.6 1111 4.69
AVG 4.7
6.50 1172.7 1168.2 675.9 870 5.31

1185.6 1180.8 685.6 870 5.48
1178.9 1172.4 679.6 919 5.69
AVG 5.5

REMARKS
* Calculation for Max. Theoretical Specific gravity (Column H) = 100 / [ ( % By Weight of Bitumen / SG BIT ) + ( % By Weight of Combined Aggregate / SG AG ) ]
SG BIT = 1.02 Mixing Temperature = 145°C to 155°C
SG AG = 2.668 Compacting Temperature = 135°C
Pen. Grade Bitumen = 80/100 PEN Test Temperature = 60°C for 45 minutes
Density Asphalt Mixture = Bulk S.G x 1000 kg/cu.m Density Asphalt Mixture = Bulk S.G x 1000 kg/cu.m
Mixing Temperature = 145°C to 155°C
SG AG = 2.668 Compacting Temperature = 135°C
Pen. Grade Bitumen = 80/100 PEN Test Temperature = 60°C for 45 minutes

49 % By Weight of Combined Aggregate = 100 - B