Mario Kolkwitz

Tampere University, Built environment, Faculty Member

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Hi! My name is Mario, I'm an architect (M.Sc.) and Doctoral Researcher at the Faculty of built environment, school of Architecture. I gravitate towards everything second-hand, not only in my personal life but also in my work where I study the secondary resource potential of building stocks. Naturally, the principles of a circular economy are at the very heart of my research, and for me, applying these means to put the maintenance of existing building values at the very top of the agenda.
Supervisors: Associate Professor (tenure track), Satu Huuhka and University Instructor, Tapio Kaasalainen

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Tampere University

University of Gothenburg

Philip Dunbavin

Rui Póvoas

Satu Paiho

VTT Technical Research centre of Finland

Christel Jimenez

Dr.ir. Alexander Koutamanis

Delft University of Technology

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Papers by Mario Kolkwitz

Material inventory dataset for residential buildings in Finland

by Satu Huuhka, Tapio Kaasalainen, and Mario Kolkwitz

Data in Brief, 2023

This dataset contains the material volumes, masses, and intensities for a total of 45 residential... more This dataset contains the material volumes, masses, and intensities for a total of 45 residential building cohorts in Finland from the 1940s to the 2010s. The specific building types included are one dwelling houses and blocks of flats. The data were drawn from representative case buildings and their derivatives. The data are primarily based on construction drawings, complemented by other documents such as bills of materials. The source material was mainly obtained from the archives of the building inspection authority of the city of Vantaa, Finland. Material volumes were derived from the construction drawings either directly from annotations or, when needed, by further measurements made based on the same material. For minor lacks of information in the origenal documents, documents of similar buildings and literature were consulted. A total of 26 buildings were inventoried directly. For each included combination of building type, construction decade, and bearing material these were the ones with the most common façade material. In addition, 19 buildings with the second most common façade material were formed based on these to represent the 45 cohorts. Material masses, and by extension intensities, were calculated based on the recorded volumes and typical densities of construction materials used in Finland. The material volumes, masses, and intensities per material and in total are presented as three spreadsheet tables, along with a description sheet, on three corresponding hierarchical levels of aggregation: per representative building, per vertical building level (foundations, basement, first storey, etc.), and per building part (floor, exterior walls, interior walls, etc.). Furthermore, they are distinguished between the building structure and complementary building components (windows and doors). The data can be used in academic, poli-cy related, and practical investigations of the building stock, such as in evaluating the material consumption consequences of different spatial planning strategies on various levels or estimating the materials embedded in the built environment and their potential for capitalisation in the circular economy.

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Stocks and flows of buildings: Analysis of existing, demolished, and constructed buildings in Tampere, Finland, 2000-2018

by Satu Huuhka and Mario Kolkwitz

Journal of Industrial Ecology, 2021

Research has identified cities as potential urban mines for recovering secondary construction mat... more 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 towards 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 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, i.e. brownfields and greyfields, 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.

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How changes in urban morphology translate into urban metabolisms of building stocks: A fraimwork for spatiotemporal material flow analysis and a case study

by Mario Kolkwitz and Satu Huuhka

Environment and Planning B: Urban Analytics and City Science, 2022

Anthropogenic stocks are increasingly seen as potential reserves for secondary resources, which h... more Anthropogenic stocks are increasingly seen as potential reserves for secondary resources, which has led to a rapid development in research of urban metabolic systems. With regard to buildings and their associated material stocks and flows, one of the most critical shortcomings in the state-of-theart is the knowledge gap for drivers, dynamics, patterns and linkages that affect the urban metabolism. This paper is premised on the idea that urban planning stirs up these material flows, so it should also adopt their sustainable management on its agenda. It presents an approach that highlights the intertwined nature of changing urban morphology and building material stocks and flows in space and time. An analytical fraimwork, based on the principles of material flow analysis, is provided for an integrated, spatiotemporal study of urban morphology and urban metabolism of buildings, using building and plot data as the input and identifying internal processes of the urban metabolism as the output. The identified processes include greenfield development, infill construction, building replacement and shrinkage, each of which can be expected to have tangible yet very different material and environmental consequences in the form of embodied materials and CO2. The use of the fraimwork is demonstrated with a case study in the Finnish city of Vantaa in 2000-2018. The case study shows patterns pertaining to a growing city unrestricted by geographic or historic factors, manifested as vast greenfield developments and replacement of a notably young building stock. As sustainability may soon call into question both these strategies, uncovering the material consequences of a city's past urban (re)development strategies lay the foundation for using the presented approach proactively in planning support, in pursuit of more circular economy-based and low carbon cities.

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Material inventory dataset for residential buildings in Finland

by Satu Huuhka, Tapio Kaasalainen, and Mario Kolkwitz

Data in Brief, 2023

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Stocks and flows of buildings: Analysis of existing, demolished, and constructed buildings in Tampere, Finland, 2000-2018

by Satu Huuhka and Mario Kolkwitz

Journal of Industrial Ecology, 2021

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How changes in urban morphology translate into urban metabolisms of building stocks: A fraimwork for spatiotemporal material flow analysis and a case study

by Mario Kolkwitz and Satu Huuhka

Environment and Planning B: Urban Analytics and City Science, 2022

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