Fig. 9 depicts the relationship between the best values for the emissions
and cost when the objective function is either the amount of CO2
or the monetary cost. It is possible to observe a linear fit between
emissions and cost (kgCO2 = 1.7533C–25,153 with R2 = 0.9988 for
emission-optimized solutions) which indicates that, as a rule of
thumb, reducing costs by 1 Euro results in savings of 1.75 kg in CO2
emissions. This relationship assumes standard technology to assess
the emissions of each construction unit. For example, if a differentmixture
composition is used, there will be an increase or decrease in concrete
composition materials, and such changes should be taken into