Improving the Mechanical Properties of Red Clay Using Xanthan Gum Biopolymer

Table 4

Results of shear strength in direct shear tests.

Test groups	Fitting equation		(kPa)
			100 kPa	200 kPa	300 kPa	400 kPa
A-3		0.954	108.00	119.37	151.36	168.2
B-3		0.963	116.65	136.53	161.07	200.13
C-3		0.937	136.28	158.23	180.62	228.13
D-3		0.989	150.19	186.08	227.19	253.2
E-3		0.999	161.25	194.82	222.86	251.96
A-7		0.968	108.69	124.51	155.15	169.49
B-7		0.996	132.06	162.03	200.98	231.97
C-7		0.956	153.01	170.51	219.53	258.94
D-7		0.969	163.84	217.77	250.86	281.09
E-7		0.981	171.82	212.78	234.47	274.55
A-14		0.953	118.02	128.30	157.69	173.38
B-14		0.989	139.48	168.24	213.05	243.38
C-14		0.939	176.08	190.22	243.99	279.52
D-14		0.878	178.38	250.39	285.93	303.84
E-14		0.988	185.28	226.04	270.15	298.20
A-28		0.986	119.42	138.28	162.50	176.37
B-28		0.980	145.37	196.1	238.63	268.13
C-28		0.996	186.38	223.05	271.00	308.77
D-28		0.924	200.66	278.68	319.84	348.82
E-28		0.994	206.95	244.46	287.34	317.49