Urban development and sustainability challenges chronicled by a century of construction material flows and stocks in Tiexi, China

Construction materials are considerable forces of global environmental impacts, but their dynamics vis-a-vis urban development are poorly documented, in part because their long lifespans require elusive and sometimes nonexistent decade-long high-resolution data. This study analyzes the construction material flow and stock trends that shaped and were shaped by the development, decline, and renewal of the Tiexi district of Shenyang, a microcosm of China's urban transformations since the early 20th century. Chronicling building-by-building the material flows and stock accumulations involved in the buildup of this area, we shed light on the physical resource context of its socioeconomic history. We find that 42 million tonnes of construction materials were needed to develop the Tiexi district from 1910 to 2018, and 18 million tonnes of material outflows were generated by end-of-life building demolition. However, over 55% of inflows and 93% of outflows occurred since 2002 during a complete redevelopment of the district. Only small portions of end-of-life materials could have been reused or recycled because of temporal and typological mismatches of supply and demand and technical limitations. Our analysis reveals a dramatic decrease in median building lifetimes to as low as 6 years in the early 21st century. These findings contribute to the discussion of long-term environmental efficiency and sustainability of societal development through construction and reflect on the challenges of urban renewal processes not only in China but also in other developing and developed countries that lost (or may lose) their traditional economic base and restructure their urban forms. This article met the requirements for a Silver/Silver JIE data openness badge described at .

Automated summary

This study analyzed the construction material flow and stock trends in the Tiexi district of Shenyang, revealing significant changes in urban development since the early 20th century. The research found a sharp decrease in the median building lifetimes to as low as 6 years in the early 21st century, highlighting the challenges of urban development and environmental efficiency.