Determine the Compressive Strength of Calcium Silicate Bricks by Combined Nondestructive Method

Table 2

Residual standard deviation of relationships for prediction of compressive strength of calcium silicate bricks.

Nondestructive method	Equation	S
Rebound hammer Schmidt, type L	(2)	0.066
Ultrasonic pulse method	(3)	0.056
Combined method (SonReb)	(4)	0.043