Marshall mix design method by ravindra c

Experimental procedure of Bituminous mix design by MARSHALL STABILITY METHOD.

1. BITUMINOUS MIX DESIGN BY MARSHALL METHOD Aim of the experiment : To determine the optimum binder content of given bituminous mix by Marshall method of mix design.

2. Apparatus required : Compaction mould , Cylindrical mould of d i a m e t e r 10.16cm and height of 7.5cm with collar , and a base plate . Compaction hammer , The compaction hammer has a flat circular plate of diameter 98.4mm and weight 4.5 kg lifted and released from a height of 45.7 cm The compaction pedestal , thermometers, oven and Dialguages.

3. Procedure : coarse aggregates , fine aggregates and mineral filler materials are mixed in the design proportion to meet the designed gradation as per Morth. The Bitumen content to be used for the mix as per the IRC standards or Morth. Exactly 1200 gms of materials are taken and heated to a temperature of 175 to 190 degree celsius. Then the required quantity of Bitumen is heat upto 120 to 165 degree celsius.

4. The compaction mould is also preheated to a temperature of 95 to 150 degree celsius . The Bitumen the aggregates are mix thoroughly by using a mechanical or hand mixers and recommended temperature depends on grade of Bitumen. The Bitumen mix is placed in a mould and compact it with a standard hammer with a height of drop 45.7cm by applying 75 blows on each side. The specimen is allowed to cool at room temperature , the weight , average thickness and diameter of the specimen are noted . The specimen are weighed in air and also suspended in air.

5. The specimen to be tested is kept immersed under water in a thermostatically controlled water bath maintained at 60 degree celsius for 30 to 40 minutes. Specimen is taken out from water bath and place it under the loading frame at the rate of 51mm/minute. The load and deformation reading are noted and the maximum load is express in kg and the deformation is expressed as flow value.

6. Result : The optimum binder content of the given mix is _______.