Table 6 Analysis of variance was performed on the fitted models to examine the significance of the F statistic.

From: Designing sustainable cement free compositions with rice husk ash to improve mechanical performance in next generation ecoblocks

   

Degrees of freedom

Sum of squares

Mean square

F statistic

Significance F

Ultimate strength

Linear model

Regression

1

1.792

1.792

16.702

0.0015

Residual

12

1.288

0.107

  

Total

13

3.080

   

Quadratic model

Regression

2

2.381

1.190

18.731

0.0003

Residual

11

0.699

0.064

  

Total

13

3.080

   

Young’s modulus

Linear model

Regression

1

170.3

170.3

0.179

0.6801

Residual

12

11450.0

954.2

  

Total

13

11620.3

   

Quadratic model

Regression

2

646.7

323.3

0.324

0.7299

Residual

11

10973.7

997.6

  

Total

13

11620.3

   

Yield stress

Linear model

Regression

1

1.497

1.497

23.934

0.0004

Residual

12

0.750

0.063

  

Total

13

2.247

   

Quadratic model

Regression

2

1.756

0.878

19.652

0.0002

Residual

11

0.491

0.045

  

Total

13

2.247

   

Plastic work

Linear model

Regression

1

0.044

0.044

15.953

0.0018

Residual

12

0.033

0.003

  

Total

13

0.076

   

Quadratic model

Regression

2

0.050

0.025

10.674

0.0027

Residual

11

0.026

0.002

  

Total

13

0.076

   
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