Relative Density Test


This test method is used to determine the relative density of cohesion less and freely draining soils, for which impact compaction will not produce a well defined moisture density curve. The maximum density produced by impact methods will generally be less than by vibratory methods. Vibratory compaction obtains maximum density with pouring, to obtain minimum density. Relative density is defined as the state of compactness of a soil with respect to the most loose and most dense states, at which it can be placed by laboratory procedures. It is expressed as the ratio of (a) the difference between the void ratio  of  a cohesion less soil in the loosest state and any given void ratio and (b) the difference between its void ratios in the most loose and most dense states. Relative density is extremely important to subsurface compaction and investigation of foundations. Building contractors and soil testing laboratories rely on this density for critical engineering designs.




Conforms to I S : 2720 (Part - 4)
It comprises of :
Vibrating table with a deck size of 750 mm. Frequency is 3600 vibrations/min., under a load of 115 kgs., with a fixed amplitude.
Cylindrical moulds of 3000 cm . and 15000 cm . capacities, with guide sleeves and clamp, surcharge weight with base plate and handle.
Dial gauge 0.01 mm. x 50 mm. travel with holder. Calibration bar 75 mm. x 300 mm. x 3 mm.
Wired for 440V., 3ph.  50 Hz.


LM173462 : Cylindrical mould 3000 cm .
LM173463 : Cylindrical mould 15,000 cm .

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