Page 61 - Unit 2: Pavement Material

Civil Engineering Department | DCC3113 : Highway & Traffic Engineering

Exercise EXERCISE 1 Check Answer

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

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% Bitumen content Density (g/cm ) % VMA % VFB % VIM Stability, kN Stiffness, kN/mm
Stability
Weight (g) Specific Gravity Volume Voids (%) (kN) Flow (mm) Stiffness
% Bulk
Bitumen Volume Refer
Spec. No Saturated Air Water (cm 3 ) Bulk Max. Bitumen Aggregate Voids Mineral Filled Bitumen Total Mix Table MEAS CORR
Sample. Surface Dry Theory Agg. CORR
No 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 CORR
(C-E) D/F * 100-I-J 100-J 100(I/L) 100-(100G/H) P X O Q/R
SG BIT SG AGG FACTOR
4.5 0 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 3.26
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 3.75
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 4.17
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 4.68
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 5.49
REMARKS
* Calculation for Max. Theoretical Specific gravity (Column H) = 100 / [ ( % By Weight of Bitumen / SG BIT ) + ( % By Weight of Combined Aggregate / SG AG ) ]
= 1.02 Mixing Temperature = 145°C to 155°C
SG BIT
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
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Prepared by : SITI ZURAIFA BINTI MD SAH, zuraifa@pmu.edu.my