Page 57 - Unit 2: Pavement Material

Civil Engineering Department | DCC3113 : Highway & Traffic Engineering

AC Mix Calculate the optimum bitumen content

• Using the plotted graphs, determine the bitumen contents corresponding to maximum
density, maximum stability, and 4% air voids (the middle of the 3 – 5% allowed)

VIM equals to 4.0%
for wearing
Peak of curve course and 5.0%
taken from the for binder course

bulk specific Density (kg/m 3 ) % Air Voids in Total Mix (VIM) from the VIM
gravity graph graph.

% Bitumen Content % Bitumen Content

Stability (kN) % Voids in Mineral Aggregate
Peak of curve
taken from the
stability graph

% Bitumen Content % Bitumen Content

VFB equals to 75%
for wearing
Flow equals to 3 course and 70% for
mm from the Flow (mm) % Voids filled Bitumen (VFB) binder course
flow graph from the VFB
graph

% Bitumen Content % Bitumen Content  HOME
Prepared by : SITI ZURAIFA BINTI MD SAH, zuraifa@pmu.edu.my