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International Journal of Concrete Structures and Materials

Table 6 Multiple regression coefficients.

From: Carbonation Model and Prediction of Polyvinyl Alcohol Fiber Concrete with Fiber Length and Content Effects

Coefficients

\(a_{1}\)

\(a_{2}\)

\(a_{3}\)

\(a_{4}\)

R2

Linear model

− 0.0219

− 0.9500

  

0.062

Quadratic model

0.0111

− 3.5231

0.0005

1.9239

0.943

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