Bituminous Mix Design by Marshall Method

Bituminous Mix Design by Marshall Method

Theory and Scope:

Bituminous mixes are used in the surface course of road and airfield pavements. The desirable bituminous mix properties include stability, density, durability, flexibility, resistance to skidding and workability during construction. Stability is defined as resistance of the paving mix to deformation under load and is thus a stress level which causes strain depending upon anticipated field conditions. Stability is function of friction and cohesion. Durability is defined as the resistance of the mix against weathering which causes hardening and this depends upon loss of volatiles and oxidation.

In this method the resistance to plastic deformation of cylindrical specimen of bituminous mixture is measured when the same is loaded at the periphery at 5 cm per minute. This test procedure is used in designing and evaluating bituminous paving mixes. ASTM vide designation D 1559-62 T has standardized the test procedure.

Aim:

To determine optimum binder content of given bituminous mix by Marshall method of Mix Design.

Apparatus:

Mould Assembly, Sample Extractor, Compaction Pedestal and Hammer, Breaking Head, Loading Machine, flow meter, thermometers, water bath and oven.

Procedure:

Observations and Calculations:

Result:

The optimum binder content of the given mix is ______________________

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