Search results
11.6 PROCEDURE In the Marshall test method of mix design three compacted samples are prepared for each binder content. At least four binder contents are to be tested to get the optimum binder content. All the compacted specimens are subject to the following tests: • Bulk density determination. • Stability and flow test.
SCOPE. 1.1 This method describes a procedure for the preparation of Marshall test specimens used in the design of bituminous mixtures, as well as specimens from field samples required for the determination of Marshall properties of dense and open-graded bituminous pavement mixtures. RELEVANT DOCUMENTS. 2.1 ASTM D6926-10. 2.2 Asphalt Institute MS-2.
Design Steps: Select and test: aggregate & bitumen. Select gradation. Develop trial blends. Calculate blended specific gravity – SGagg blend. Establish mixing and compaction temperatures. Heat and mix bitumen and aggregates. Compact specimen (100 mm diameter) . Stability and flow test (Marshall test) .
Marshall stability of a test specimen is the maximum load required to produce failure when the specimen is preheated to a prescribed temperature placed in a special test head and the load is applied at a constant strain (5 cm per minute).
Chapter Description. Aims. Understand the steps, principles and theory behind the design of flexible pavement using Marshall mix design method. Expected Outcomes. Students should be able to understand basic criteria for pavement mix design. Students should be able to elaborate different type of tests involved in pavement design.
The basic Marshall test consists essentially of crushing a cylinder of bituminous material between two semi-circular test heads and recording the maximum load achieved (i.e. the stability) and the deflection at which the maximum load occurs (i.e. the flow).
4.2 MARSHALL MIX DESIGN This test procedure is used in designing and evaluating bituminous paving mixes and is extensively used in routine test programmes for the paving jobs. There are two major features of the Marshall method of designing mixes namely, density – voids analysis and stability – flow test.
