To determine the Marshall stability and flow of bitumen mix.
IS Standards used:ASTM D6927
Need and Scope:The original Marshall method is applicable only to hot-mix asphalt paving mixtures containing aggregates with maximum sizes of 25 mm or less. This method covers the measurement of the resistance to plastic flow of cylindrical specimens of bituminous paving mixture loaded on the lateral surface by means of the Marshall apparatus.
In the Marshall method each compacted test specimen is subjected to the following tests and analysed in the order listed below
Preparation of test specimens:The coarse aggregates, fine aggregates and the filler material should be proportioned and mixed in such a way that final mix after blending has the gradation with in the specified range. The aggregates and the filler are mixed together in the desired proportion as per the design requirements and fulfilling the specified gradation. The required quantity of the mix is taken so as to produce a compacted bituminous mix specimen of thickness 63.5 mm, approximately.
Preparation of mixtures:Weigh into separate pans for each test specimen the amount of each size fraction required to produce a batch that will result in a compacted specimen 63.5 +/- 1.27mm (2.5 +/- 0.05 in.) in height. This will normally be about 1200 gm. It is generally to prepare a trial specimen prior to preparing the aggregate batches. If the trial specimen height falls outside the limits, the amount of aggregate used for the specimen may be adjusted using:
| Sieve Size (mm) | Range of Percentage passing by weight | % Weight of Aggregates | Weight of Aggregates (gm) |
| 20 | 100 | ||
| 12.5 | 80-100 | ||
| 10 | 70-90 | ||
| 4.75 | 50-70 | ||
| 2.36 | 35-50 | ||
| 0.600 | 18-29 | ||
| 0.300 | 13-23 | ||
| 0.150 | 8-16 | ||
| 0.075 | 4-10 | ||
| Binder content by weight of mix |
The Marshall stability was found to be: kN
The flow of the mix was found to be: mm
Get all latest content delivered to your email a few times a month.