the emissions. This value is similar to 1/17.57 which corresponds to
the cost optimization. The reason for this is that the ratio L/h1 is always
lower than 17 (see Table 5). As shown in Fig. 11, values for slab thickness
decrease with the span length when the objective is to reduce
the CO2 emissions. However, this relationship only occurs when the
value for the span length is less than 35 m in the case of reducing cost.
In addition, Fig. 11 shows no clear difference in values for slab thickness
between the cost-optimized and the emission-optimized design.