Prediction of the Compressive Strength of Concrete Admixed with Metakaolin Using Gene Expression Programming

Table 4

Design variables for the concrete mix.

Input variables	Code	Output variable	Code
Cement	x1	28-day compressive strength	y
Metakaolin	x2
Fine aggregate	x3
Coarse aggregate	x4
Water	x5

The input parameters are selected for the purpose of prediction of strength during mix design. The model from the GEP algorithm can, then, be used to predict strength, given the variables x₁, x₂, x₃, x₄, and x_5.