NSF (Nylon Synthetic Fiber) Effectiveness in Stabilizing Weak Subgrade Soil: An Experimental Investigation

Table 4

Percentage increase in CBR values due to reinforcement of fibers.

Fiber length (L (mm))	Percentage of fiber by dry weight of soil	Fiber diameter = 0.3 mm				Fiber diameter = 0.4 mm
		AR = (L/D)	CBR value (%)	% increase in CBR value	Soaked CBR swell (%)	AR = (L/D)	CBR value (%)	% increase in CBR value	Soaked CBR swell (%)
	0		1.80	—	8.95		1.80	—	8.95
10	0.5	33.33	5.03	179.4	8.22	25	5.21	189.4	6.19
	1		5.83	223.9	7.09		6.39	255.0	6.03
	1.5		6.575	265.3	5.84		6.89	282.8	5.06
	2.5		6.52	262.2	3.87		6.81	278.3	4.11
	0	—	1.80	—	8.95		1.80	—	8.95
20	0.5	66.67	5.45	202.8	8	50	6.01	233.9	6.07
	1		6.2	244.4	6.13		6.87	281.7	5.66
	1.5		7.38	310.0	4.23		7.96	342.2	5.65
	2.5		7.3	305.6	3.87		8.02	345.6	5.5

Making these values bold is just to see the CBR value of the natural (unreinforced) soil and compare it with other percentages of reinforcement.