Strength and Road Performance of Superabsorbent Polymer Combined with Cement for Reinforcement of Excavated Soil

Table 5

Minimum bearing ratio requirement of roadbed filling.

Subgrade area		Below the surface of the road depth (m)	Minimum CBR value of packing (%)
			Expressways and first class roads	The secondary roads	Third and fourth level roads
The road bed		0–0.3	8	6	5
Under the road bed	Light, medium	0.3–0.8	5	4	3
	Heavy traffic	0.3–1.2	5	4	—