Table 2.

Rate parameter (τ) and equilibrium swelling (S_e) for the tested SAP.

Soil	SAP-Soil proportion [%]	Topsoil layer height [cm]	Load [kPa]	τ [min]	Se [g/g]	Standard error of regression [g/g]	Coefficient of determination R2 [−]
Sandy loam	0.30	10.0	1.47	95.91	96.52	2.53	0.996
		20.0	2.94	90.18	88.59	3.77	0.990
		40.0	5.89	110.16	69.14	1.04	0.999
	0.50	10.0	1.47	83.58	81.61	1.85	0.997
		20.0	2.94	93.61	81.53	2.87	0.993
		40.0	5.89	142.76	61.48	1.49	0.997
	1.00	10.0	1.47	76.36	76.22	2.54	0.994
		20.0	2.94	57.25	71.88	3.42	0.987
		40.0	5.89	75.97	52.68	2.21	0.990
Coarse sand	0.30	10.0	1.47	55.99	100.28	2.75	0.996
		20.0	2.94	94.09	86.58	2.92	0.994
		40.0	5.89	88.57	77.94	2.08	0.996
	0.50	10.0	1.47	96.51	84.80	3.50	0.991
		20.0	2.94	111.91	76.88	2.40	0.995
		40.0	5.89	97.12	75.40	2.81	0.992
	1.00	10.0	1.47	77.89	85.53	2.37	0.996
		20.0	2.94	79.09	84.13	3.26	0.992
		40.0	5.89	115.81	71.43	2.97	0.990
Control without load		0.00	0.00	52.37	293.19	6.47	0.997