Sandy Soil Improvement Using MICP-Based Urease Enzymatic Acceleration Method Monitored by Real-Time System

Table 2

Effect of Ca²⁺ concentrations on V_s and G (by bender element tests), as well as C and ϕ (by direct shear tests).

Ca^2+ (mM)	CO(NH2)2 (mM)	Urease (%, v/v)	Vs (m s^−1)	G (MPa)	Cohesion, C (T m^−2)	Internal friction angle, ϕ (degree)
0	0	0	133.4	26.10	0.48	23
50	250	20	193.9	55.24	0.89	14.8
100	250	20	236.61	82.25	0.94	27.7
250	250	20	305.77	137.37	1.59	32
500	250	20	139.47	28.58	0.39	27.6