Figure 5
The figure consists of a complex network visualization with keyword nodes interconnected by a dense web of lines. The visualization is organized into four distinct, overlapping circular clusters labeled with dashed outlines. “Cluster 1” is on the top left, outlined in red, and contains nodes such as “conceptual framework”, “systematic literature review”, “construction materials”, “waste management”, and “landfill”. “Cluster 2” is on the bottom right, outlined in green, and contains nodes such as “environmental management”, “green supply chain management”, “environmental protection”, and “integer programming”. “Cluster 3” is on the top right, outlined in blue, and contains nodes such as “supply chain management”, “barriers”, “south australia”, and “stakeholder”. “Cluster 4” is at the bottom, outlined in yellow, and contains nodes such as “construction companies”, “sustainability”, “civil constructions”, and “performance evaluation”. Several central nodes, like “construction industry” and “reverse logistics”, act as bridge points between multiple clusters.Illustration of keyword co-occurrence analysis. Source: Authors' own work