Proposal of a new analytical procedure for the measurement of water absorption by stone. Preliminary study for an alternative to the Italian technical normative NORMAL 07-81

Table 2 Comparison of experimental data obtained with different measurement procedures ¹

Sample	measurement trial n°	A(%)_a	Mean A(%)_a	A(%)_b	Mean A(%)_b	$\frac{A {(%)}_{b} - A {(%)}_{a}}{A {(%)}_{a}} 100$
WM	I	0.621		0.514		-17.2
	II	0.618	0.635±0.026	0.560	0.580±0.078	-9.4
	III	0.665		0.666		0.1
RM1	I	0.552		0.560		1.4
	II	0.644	0.622±0.062	0.570	0.567±0.006	-11.5
	III	0.671		0.570		-15.1
RM2	I	0.217		0.213		-1.8
	II	0.260	0.239±0.029	0.177	0.198±0.019	-31.8
	III	0.272		0.203		-25.5

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