Page 58 - Unit 2: Pavement Material

Civil Engineering Department | DCC3113 : Highway & Traffic Engineering

AC Mix Calculate the optimum bitumen content

The mean optimum bitumen content shall be determined by averaging five optimum
bitumen contents so determined as follows;

i. Peak of curve taken from the stability graph, % Bitumen Content = 4.90 %
ii. Flow equals to 3 mm from the flow graph, % Bitumen Content = 5.00 %

iii. Peak of curve taken from the bulk specific gravity graph, % Bitumen Content = 5.25
%
iv. VFB equals to 75% for wearing course and 70% for binder course from the VFB graph,
% Bitumen Content = 5.25 %

v. VIM equals to 4.0% for wearing course and 5.0% for binder course from the VIM
graph, % Bitumen Content = 5.25 %

The optimum bitumen content = 5.25 + 5.25 + 4.90 + 5.00 + 5.25

5
= 5.13 %

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Prepared by : SITI ZURAIFA BINTI MD SAH, zuraifa@pmu.edu.my