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

Table 7

Four quantitative relationship models and corresponding analysis results between water-to-cement ratio and yield stress of Bingham cement grouts.

Models	Fit model expressions	Source	DF	SS	MS	F		R^2 (%)	R^2 (adj)
Linear model		Regression	1	18.49	18.49	343.55	≤0.001	92.46	92.19
		Residual error	28	1.51	0.05
		Sum	29	19.99
Logarithmic model		Regression	1	18.94	18.94	502.53	≤0.001	94.72	94.53
		Residual error	28	1.06	0.037
		Sum	29	20.0
Exponential model		Regression	1	35.69	35.69	983.47	≤0.001	97.23	97.13
		Residual error	28	1.016	0.04
		Sum	29	36.79
Power function model		Regression	1	34.90	34.90	539.59	≤0.001	95.07	94.89
		Residual error	28	1.81	0.07
		Sum	29	36.71