MARSHALL STABILITY

Updated: Jul 16, 2020

AIM

To determine the Marshall stability of bituminous mixture as per

ASTM D 1559.

PRINCIPLE

Marshall stability is the resistance to plastic flow of cylindrical

specimens of a bituminous mixture loaded on the lateral surface.

It is the load carrying capacity of the mix at 60 °C and is

measured in kg.

APPARATUS



MARSHALL STABILITY APPARATUS

i) Marshall stability apparatus

ii) Balance and water bath

SAMPLE

From Marshall stability graph, select proportions of coarse

aggregates, fine aggregates and filler in such a way, so as to fulfill

the required specification. The total weight of the mix should be

1200g.

PROCEDURE

i) Heat the weighed aggregates and the bitumen separately

upto 170 °C and 163 °C respectively.

ii) Mix them thoroughly, transfer the mixed material to the

compaction mould arranged on the compaction pedestal.

iii) Give 75 blows on the top side of the specimen mix with a

standard hammer (45cm, 4.86kg). Reverse the specimen

and give 75 blows again. Take the mould with the specimen

and cool it for a few minutes.

iv) Remove the specimen from the mould by gentle pushing.

Mark the specimen and cure it at room temperature,

overnight.

v) A series of specimens are prepared by a similar method

with varying quantities of bitumen content, with an increment

of 0.5% (3 specimens) or 1 bitumen content.

vi) Before testing of the mould, keep the mould in the water

bath having a temperature of 60 °C for half an hour.

vii) Check the stability of the mould on the Marshall stability

apparatus.

REPORTING OF RESULTS

Plot % of bitumen content on the X-axis and stability in kg on

the Y-axis to get maximum Marshall stability of the bitumen mix.

A sample plot is given in Annexure-X




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