Influence of Coupling Effects of Time and Water-to-Cement Ratio on Rheological Properties of Bingham Cement Grouts

Table 5

Four change relationship models and corresponding analysis results between coupling effects of time and water-to-cement ratio and plastic viscosity of Bingham cement grouts.

Models	Fitting model expressions	Source	DF	SS	MS	F		R^2 (%)	R^2 (adj)
Linear model		Regression	2	0.02	0.01	268.16	≤0.001	95.21	94.85
		Time	1	0.02	0.02	535.05	≤0.001
		Water-to-cement ratio	1	0.00	0.00	1.28	0.27
		Residual error	27	0.00	0.00
		Sum	29	0.02
Logarithmic model		Regression	2	0.01	0.01	31.05	≤0.001	73.84	71.47
		Time	1	0.01	0.01	61.94	≤0.001
		Water-to-cement ratio	1	0.00	0.00	0.17	0.69
		Residual error	27	0.02	0.00
		Sum	29	0.02
Exponential model		Regression	2	8.18	4.09	1673.32	≤0.001	99.20	99.14
		Time	1	8.10	8.10	3313.24	≤0.001
		Water-to-cement ratio	1	0.08	0.08	33.39	≤0.001
		Residual error	27	0.01	0.00
		Sum	29	8.24
Power function model		Regression	2	5.63	2.81	74.69	≤0.001	87.16	86.00
		Time	1	5.58	5.58	147.95	≤0.001
		Water-to-cement ratio	1	0.05	0.05	1.42	0.25
		Residual error	27	0.83	0.04
		Sum	29	6.46