MT - 110
MARSHALL STABILITY TEST APPARATUS ASTM : D 1559 - T - 62
MARSHALL STABILITY TEST APPARATUS
ASTM : D 1559 - T - 62
Originally developed by Brause Marshall, a highway engineer in U.S.A. later on standardized by ASTM. Generally the test is applicable to hot mix designs using bitumen and aggregates upto a maximum size of 25 mm. In this method, the resistance to plastic deformation of cylindrical specimen of bituminous mixture is measured when the same is loaded at periphery at 5 cm per min. This test procedure is used in designing and evaluating bituminous paving mixes.The test procedures is extensively used in routine test programmes for paving jobs.There are two major features of the marshal method of designing mixes namely.
a) Density - voids analysis b)Stability - flow tests.
The marshal stability of mix is defined as a maximum load carried by a compacted specimen at a standard test temperature of 60 oC. The flow value is deformation the marshal test specimen under goes during the loading upto the maximum load, in 0.25mm units.In this test and attempt is made to determine optimum binder content for the type of aggregate mix and traffic intensity.
The apparatus consists of :