Building Materials in a Circular Economy at DTU Sustain

The extensive use of natural resources in the building and construction sector is why the sector is being pointed out as a key sector in the EU strategy for circular economy. Circular solutions cannot solely be developed based on the current knowledge foundation, which has developed to support the linear use of natural resources (extract – use – discard). New fundamental and applied research is a prerequisite for the
transformation. 

This IDA Byg Event is hosted by the Section for Materials and Durability at DTU Sustain. An overall introduction will be given to principles in circular construction, and the event will introduce current research projects based on these principles. The presented projects are all conducted in collaboration with different stakeholders in the sector. 

Program: 

Kl. 16:45 Possibility to get coffee/tea 

Kl. 17:00 Introduction and today's program v/ Keld Olsen, IDA Byg 

Kl. 17:10 Principle of Circular Economy and research overview at DTU Sustain v/ Lisbeth
M. Ottosen, DTU Sustain  

Kl. 17:30 Recycling - Replacement of cement with secondary raw materials v/ Ida
Maria Gieysztor Bertelsen, DTU Sustain 

Kl. 17:45 Recycling - Replacement of natural sand in concrete v/ Anders
Hedegaard Jensen, DTU Sustain 

Kl. 18:00 Circular Economy for Climate Mitigation v/ Ana Teresa Lima, DTU Sustain 

Kl. 18:30 Break with refreshments in the form of sandwiches and beverages 

Kl. 19:00 Two real cases of assessment of concrete elements for reuse v/ Katja Irene Møller Thygesen, DTU Sustain 

Kl. 19:15 Reuse of Timber v/ Serkan Karatosun, DTU Sustain 

Kl. 19:30 Tour of the laboratory/experimental hall 

Kl. 20:15 Closing speech v/ Lisbeth M. Ottosen, DTU Sustain 

After each presentation, time is set aside for questions.

Any questions about the event contact Keld Olsen on 60825489 / keldolsen2@godmail.dk 

Further elaboration of the program: 

Principle of Circular Economy and research overview at DTU Sustain by Professor
Lisbeth M. Ottosen

Circular economy principles are outlined and discussed under the frame of the
building and construction sector. A brief view of the ongoing
standardization of circular economy practices is given. The need for
increased knowledge is discussed, and the vision of the Section for
Materials and Durability is presented as an introduction to the
following presentations.

Recycling - Replacement of cement with secondary raw materials by Postdoc
Ida Maria Gieysztor Bertelsen

Secondary resources with specific properties have the potential to be used as
supplementary cementitious materials (SCM) in concrete products. The cement production accounts for about 8% of the global anthropogenic CO2 emissions every year. Research within potential SCMs is, therefore, of great interest as it can replace part of the clinker content in concrete. 

At the Section for Materials and Durability at DTU Sustain, secondary resources such as wood ash, clay brick waste, municipal solid waste incineration fly ash, and mine tailings are some of the materials that have been studied as potential SCMs. In-depth results from a research project on “Reactivity of recycled clay brick powder as
SCM” will be presented.

Recycling - Replacement of natural sand in concrete by Industrial PhD student Anders Hedegaard Jensen, DTU Sustain

The project is about alternative materials to natural sand in concrete, and how we can save on a scarce resource that is almost depleted in several Danish regions. The industrial PhD project from COWI attempts to utilize a surplus material from Amagerværket, which is also produced elsewhere in Denmark, and which is currently being sent out
of the country. Learn about the opportunities and challenges of using
alternative materials in concrete and how the project is progressing.

Circular Economy for Climate Mitigation by Senior ResearcherAna
Teresa Lima, DTU Sustain

This talk summarizes the efforts carried out in the Horizon Europe project
CO2NSTRUCT (https://co2nstruct.dtu.dk/) when it comes to categorizing circular economy practices carried out in the construction sector for better estimation of their potential for climate mitigation. The speaker will present results from a recent paper (Mapping circular economy practices for steel, cement, glass, brick, insulation, and wood – A review for climate mitigation modeling https://www.sciencedirect.com/science/article/pii/S1364032124004234)
and what is missing to increment climate mitigation models.

Two real cases of assessment of concrete elements for reuse by PhD
student Katja Irene Møller Thygesen

What are some of the technical questions that need answering when wanting to reuse concrete elements from one building to another? And how can we provide answers in the least invasive way? In this presentation, Katja Thygesen will present two cases where DTU has collaborated with the industry to enable reuse of pre-cast concrete elements. In this work, we made useful findings on what to document, how to do it, and how to communicate it in a way fitting for demolition and reconstruction processes. 

Reuse of Timber by PhD student Serkan Karatosun, DTU Sustain

Reusing structural load-bearing timber component is contributing to circular
transition of construction industry. To achieve this goal, StructuralReuse project is focused on standardizing the documentation of the quality of structural components for reuse. This presentation will introduce StructuralReuse's progress on a non-destructive
procedure for assessing reclaimed timber. Our approach combines non-destructive testing methods with visual grading.

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