Table 1 Parameter definition.
Parameters | Parameter definition | Parameters | Parameter definition |
---|---|---|---|
T | Total project duration | \({\omega _2}\) | Environmental goal weighting factor |
I | The set of processes on a critical line in the network plan | \({\omega _3}\) | Social goal weighting factor |
\({t_{si}}\) | Minimum duration of process i | \({H_i}\) | Total workdays of workers to complete process i |
\({t_i}\) | Actual duration of process i | \({C_{hi}}\) | Per capita respiratory carbon emission factor |
\({t_{li}}\) | Maximum duration of process i | \({M_i}\) | Consumption of the first material to complete process i |
\({t_{ni}}\) | Normal duration of process i | \({C_{mj}}\) | Carbon emission factor of the jth material |
\({C_Z}\) | Direct cost of process i | \({U_i}\) | Completion of the first energy consumption to complete process i |
\({C_J}\) | Indirect costs of process i | \({C_{sk}}\) | Carbon emission factor of the kth energy source |
\({C_B}\) | Variable cost of early or late completion of works | \({E_A}\) | Total emissions of all air pollutants |
\({C_T}\) | Carbon cost of process i | \({E_D}\) | Total emissions of all solid waste |
\({C_{ni}}\) | Direct costs for the normal duration of process i | \({E_W}\) | Total volume of all sewage discharges |
\({\alpha _{1i}}\) | Incremental marginal cost factor | \(E{I_i}\) | Environmental level index of process i |
\({\alpha _{2i}}\) | Overhead costs per day for process i | \(E{I_{i\max }}\) | Limit values of environmental level of the process |
\({\alpha _{3i}}\) | Variable cost factor | \(W{I_i}\) | Number of jobs provided by completed processes |
\({\alpha _{4i}}\) | Carbon tax rate for construction industry | K | Sustainability level index |
\({\omega _1}\) | Economic target weighting factor | \({C_{Ti}}\) | Carbon cost of process i |