Core and Cube Test Procedure loading rate calculations as per IS 516

IS 516-1959 page no 20 section 9.8

CTM Machine.jpg

Procedure- The Load shall be applied continuously and without shock at a rate of 140 Kg/Sq cm/min.


In machine load applied KN/Sq mm /sec.
1st convert kg/sq cm/min to KN/ Sq mm/sec.
1 kg=0.0098 KN, 1 Sq cm= 100 Sq mm, 1 Min = 60 sec
so 140 Kg/Sq cm/min= (140*0.0098)/100/60=(140*0.0098)/(100*60)=0.00022867=0.0002287 KN/ Sq mm/sec

Core.jpg
CORE=69 mm
Surface Area of Core= π * r 2= 3.14 * 34.5 * 34.5 = 3737.385 Sq mm
Rate of loading per Second in KN for Core = 0.0002287 Kn/Sq mm/sec * 3737 Sq mm = 0.85473 Kn/sec
Rate of loading per Minute= 0.85473 * 60 = 51.28 Kn/Sec


Cube.jpg
CUBE =100*100 mm
Area of cube=100 * 100=1000 Sq mm
Rate of loading per second in KN for cube test size 100 * 100= (0.0002287 Kn/Sq mm/sec) * 1000 Sq mm = 2.287 Kn/sec
Rate of loading per Minute=2.287 Kn/Sec * 60 =137.22 KN/Minute

CUBE=150*150 mm

Area of cube=150 * 150 = 22500 Sq mm
Rate of loading per second in KN for cube test size 150 * 150= (0.0002287 Kn/Sq mm/sec) * 22500 Sq mm = 5.14 Kn/sec
Rate of loading per Minute =5.14 Kn/Sec * 60 = 308.7 KN/Minute
 
Note in core procedure in punching mistake
CORE=69 mm
Surface Area of Core= π *r2= 3.14*34.5*34.5=3737.385 Sq mm
Rate of loading per Second in KN for Core =0.0002287 Kn/Sq mm/sec *3737 Sq mm = 0.85473 Kn/sec
Rate of loading per Minute=0.85473*60=51.28 Kn/Min
 
As per standard, the rate of loading is "stress rate of loading", which is not available in many of the machine.
Since, the machine should have the capability of "servo control mechanism"; that is slightly expensive. If it is not, then you may have to control manually to the nearest.
eg. CC cubes - 5.1 kN /s