APPARATUS: Compression testing machine, cylinder mold of 150mm diameter and 300mm height, weighing balance.
PROCEDURE
(i) Cast the cylinder and cure for 28 days.
(ii) Takeout the specimen from the curing tank.
(iii) Wipe out the excess water from the surface of specimen.
(iv) Place the specimen vertically on the platform of compression testing machine.
(v) Apply the load continuously and uniformly without shock at the rate of 315 kn/min. And continue the loading until the specimen fails.
(vi) Record the maximum load taken.
Test at least 3 specimens. Report Date of casting : Date of testing :
Age of specimen :
Curing condition :
CALCULATIONS: Range Calculation Characteristic compression strength at 28 days = N/ mm2
Area of cross section = pi.d2
Expected load = stress x area xf.s = Range to be selected is……………………
COMPRESSION STRENGTH Maximum load = Compression strength = (Maximum load/ Cross sectional area)
RESULT Compressive strength of cylinder =…………………….N/mm2
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