Wednesday, 31 January 2018

Specific Gravity Test For Bitumen 

INTRODUCTION

Specific gravity is defined as the ratio of the mass of a given volume of the bituminous material to the mass of an equal volume of water, the temperature of both being specified as 27'C.

APPARATUS

Specific gravity bottles of 50ml capacityWater bathBath thermometersample (half the volume of the specific gravity bottles).

PROCEDURE

Clean, dry and weigh the specific gravity bottle along with the stopper (Weight ‘A’).Fill the specific gravity bottle with freshly boiled distilled water and insert the stopper firmly. Keep it in the water bath having a temperature of 27.0 + 1oC for not less than half an hour and weigh it (Weight ‘B’).Weigh the specific gravity bottle about half-filled with the material (Weight ‘C’).Weigh the specific gravity bottle about half-filled with the material and the other half with distilled water (Weight ‘D’).Weigh the specific gravity bottle completely filled with the material (Weight ‘E’).

REPORTING OF RESULTS

(i)Specific gravity (Solids and semi-solids) = (C-A)/[ (B-A) – (D-C)]

)ii)Specific gravity (Liquids) = (E-A)/(B-A)

The average of the two results should be reported.

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