Research has identified cities as potential urban mines for recovering secondary construction materials. Studies typically focus on stocks or flows of bulk materials on high abstraction levels. To enable a shift of focus toward higher levels of circular economy, such as waste minimization, there is a need for a more detailed understanding of the dynamics that contribute to the waste flows, building replacement in particular. This paper examines the characteristics and location of the stocks and flows of buildings, both residential and non-residential, in the city of Tampere, Finland, over the last 20 years. Statistical and geographical analyses are performed on the building stock, new construction, and demolition in Tampere to unveil patterns pertaining to stock change and building replacement. The study shows that these patterns vary significantly between buildings of different function. Spatially confined redevelopment areas within the city structure, that is, brownfields and grayfields, whose industrial and commercial functions yield to housing and mixed residential–commercial use, make up major arenas for replacement. Policy-making should acknowledge that urban planning stirs these waste flows and incorporate their conscious prevention and management on its agenda.

中文翻译：

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建筑物的存量和流量：2000-2018 年芬兰坦佩雷现有、拆除和建造的建筑物的分析

研究已将城市确定为回收二次建筑材料的潜在城市矿山。研究通常侧重于高抽象级别的散装材料的库存或流动。为了能够将重点转向更高水平的循环经济，例如废物最小化，需要更详细地了解导致废物流动的动态，特别是建筑物更换。本文研究了过去 20 年芬兰坦佩雷市住宅和非住宅建筑的存量和流量的特征和位置。对坦佩雷的建筑存量、新建和拆除进行了统计和地理分析，以揭示与存量变化和建筑物更换有关的模式。研究表明，这些模式在不同功能的建筑物之间存在显着差异。城市结构内空间受限的再开发区，即棕地和灰地，其工业和商业功能产生于住房和住宅-商业混合用途，构成了主要的替代场所。政策制定者应该承认城市规划会激起这些废物流，并将其有意识的预防和管理纳入其议程。