Page 49 - Lecture Notes DCC3113

Procedures

Figure 3-17: Marshall Mix Design Method Procedures

Aggregate evaluation

i. Determine aggregate physical properties, i.e toughness and abrasion, durability and abrasion,
cleanliness and particle shape
ii. If the aggregate is acceptable according to the step no (i), then performed other required tests
: gradation, specific gravity and absorption
iii. Perform blending calculations to achieve the mix design gradation. Often, aggregates from
more than one source or stockpile are used to obtain the final aggregate gradation used in a
mix design. Trial blends of these different gradations are usually calculated until an
acceptable final mix design gradation is achieved

Sample preparation

i. For each laboratory design mix gradation, four specimens shall prepared for each bitumen
content with the range given in Table 3.1 at increments of 0.5 percent, in accordance with
ASTM D1159 using 75 blows/face compaction standard.
ii. All bitumen contents shall be in percentage by weight of the total mix

Table 3.5: Design Bitumen Contents
(Source: Jabatan Kerja Raya, STANDARD SPECIFICATION FOR ROADWORKS, JKR/SPJ/2008-S4, 2008
(page 27))
AC 10 - Wearing Course 5.0 - 7.0%

AC 14 - Wearing Course 4.0 - 6.0 %
AC 28 - Binder Course 3.5 - 5.5%

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