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Table 2 Input variable coded and actual range

From: Optimizing biochar-based geopolymer composites for enhanced water resistance in asphalt mixes: an experimental, microstructural, and multi-objective analysis

Input factors

Coded level

\(-1\)

0

\(+1\)

A: asphalt binder content (%)

4

5

6

B: BGC content (%)

0

2

4