THE SPATIAL-TEMPORAL DISTRIBUTION OF BRICK MATERIAL RESOURCES IN BRICK-CONCRETE-STRUCTURED HOUSING IN INNER TIANJIN CITY

Determining how to reasonably protect, upgrade, or rebuild old communities, deciding how to use the material resources they contain, and the generation of construction and demolition (C&D) waste are urgent problems faced in the process of urban renewal in Tianjin, China, that require solutions. In this study, brick and concrete housing structures in the downtown area of Tianjin, China, are considered as an example, and a phased renewal plan is proposed. Based on the nuclear density analysis method and the standard deviation ellipse method, the spatial agglomeration trends and distribution directions of the used bricks that will be produced in the city center during each demolition stage are investigated. The results demonstrate that the overall brick material resources are unevenly distributed; their density will increase over time, and the density core will present a trend of first gathering and then dispersing. Based on the spatiotemporal distribution of resources, it is necessary to formulate an urban resource recycling system to achieve sustainable development.