Recycling of mineral wool waste as supplementary cementitious material through thermochemical treatment

Abstract

Mineral wool is commonly used in construction as thermal insulation material. After the product’s lifetime, it is classified as hazardous waste if no trademark of the European Certification Board for Mineral Wool Products (EUCEB) or the German Institute for Quality Assurance and Labelling (RAL) exists. Mineral Wool Waste (MWW) is typically landfilled in Europe, which is challenging due to its low bulk density and dimensional stability. This circumstance highlights the need for alternative recycling methods that increase the recycling rate of construction and demolition (C&D) waste. This article outlines the recycling opportunities of MWW and focuses on the use of thermochemical treatment of different mixtures of input materials to produce a supplementary cementitious material (SCM). The material characterisation results and investigations on the binder suitability demonstrate that the slag fractions after the thermochemical treatment are well-qualified to be used as reactive binder components. Additionally, a material flow analysis was conducted to estimate the substitution potential of MWW as SCM in the Austrian cement industry.

Keywords

Recycling mineral wool waste stone wool glass wool supplementary cementitious material thermochemical treatment

Introduction

The United Nations (UN) 2030 Agenda for Sustainable Development proclaimed 17 Sustainable Development Goals (SDGs), building on the Millennium Development Goals (United Nations, 2015). The relevant issues for this article are the direct protection of the planet through sustainable consumption and the sustainable management of its natural resources. In detail, the focus is on promoting the consideration of waste as a valuable resource, transforming the current economic system towards a sustainable circular economy, and preventing waste. At the Euopean Union (EU) level, efforts in this direction have been laid down in the Circular Economy Action Plan (European Commission, 2015) and the European Green Deal (European Commission, 2019) and have been incorporated into the Austrian Circular Economy Strategy (Federal Ministry of Austria for Climate Action, Environment, Energy, Mobility, Innovation and Technology, 2022).

The European Green Deal serves as a growth strategy to achieve zero net greenhouse gas emissions in the EU by 2050 and to decouple economic growth from using fossil resources to combat climate change (European Commission, 2019). Providing alternative binder components from residues, such as mineral wool waste (MWW), meets this requirement and is also reflected in SDG 12 Responsible Consumption and Production. Especially in energy-intensive sectors such as chemical, cement and steel industries, substituting virgin raw materials with high-quality secondary raw materials (SRMs) is important to reduce the CO₂ intensity of the products. In this context, the indispensability of these industries in Europe is explicitly mentioned (European Commission, 2019). Therefore, these sectors’ decarbonisation, modernisation and optimisation are particularly important to achieve the climate goals.

As mentioned before, the efficient use and recycling of by-products and waste within the EU is essential to achieve climate neutrality by 2050. The EU has set a target for member states to increase the recycling of construction and demolition (C&D) waste, including mineral wool insulation, as part of its circular economy strategy to minimise the environmental impact, recover valuable raw materials and reduce waste. The EU Waste Framework Directive (European Parliament and Council, 2018) sets a target of 70% recycling and reuse of C&D waste by 2020. As a result, there will be a landfill ban for MWW in Austria from 2027 (Federal Ministry of Austria for Climate Action, Environment, Energy, Mobility, Innovation and Technology, 2021). The prerequisite for this is the existence of a suitable recycling process. In this context, this investigation aims to establish a recycling of MWW to provide an SCM for the cement industry.

Mineral wool products

Mineral wool insulation is widely used in the construction industry as a thermal insulation material to reduce heat loss or gain through building envelopes. It is commonly used in walls, roofs, floors and industrial applications to insulate pipes, boilers, tanks and other equipment. Mineral wool is a general term used to refer to a group of thermal insulation materials. This investigation focuses on glass wool (GW) and stone wool (SW). GW is made from recycled glass and sand, and SW is made from natural rock materials such as basalt, diabase or slag. In both cases, the input materials are melted at high temperatures and spun into fibres. These fibres are mixed with a binder and formed into batts, blankets or loose-fill insulation (Joint Research Centre et al., 2013; Papadopoulos, 2005; Sirok et al., 2008). However, the low bulk density of mineral wool makes it difficult to compact the waste and ensure its stability in a landfill (Sattler et al., 2020). The bulk density can be assumed in the range of 13–100 kg m⁻³ (Saint-Gobain ISOVER Austria GmbH, 2019a) for GW and 25–200 kg m⁻³ (Saint-Gobain ISOVER Austria GmbH, 2019b) for SW.

Waste generation

When buildings containing mineral wool are demolished or renovated, the insulation is part of the C&D waste and should be collected separately in Austria (Federal Ministry of Austria for Agriculture, Forestry, Environment and Water Management, 2015; Federal Ministry of Austria for Climate Action, Environment, Energy, Mobility, Innovation and Technology, 2021). MWW is a significant issue in Europe due to the C&D waste generated by the building sector. Improper management of mineral wool insulation can lead to environmental pollution. As a result, the total amount of MWW generated in the 27 countries of the EU was approximately 2.54 million tonnes in 2010 and is expected to increase to 2.82 million tonnes by 2030 (Mueller, 2009; Väntsi and Kärki, 2014; Yap et al., 2021). This assumption is confirmed by the EU’s forecast growth of the mineral wool insulation market from 2015 to 2025 (Pavel and Blagoeva, 2018). In 2020, 2.5 million cubic metres of mineral wool (SW and GW) was sold and installed for insulation purposes, representing a market share of around 40% of total insulation materials in Austria (Demacsek, 2021). In general, the volume distribution of mineral wool production is estimated to be 1/3 GW and 2/3 SW (Mueller, 2009). Considering the production distribution and the density range, 10,800–83,300 tonnes of GW and 41,500–333,300 tonnes of SW were sold in Austria in 2020. However, these quantities placed on the market will only end up as waste after a correspondingly long service life of approximately 30 years (Mueller, 2009; Pavel and Blagoeva, 2018). Considering this circumstance, Kleemann et al. (2017) analysed Vienna’s material stock in buildings and calculated 378,000 tonnes of mineral wool in 2013. The annual amount of MWW can only be estimated by adding up the artificial mineral fibre and asbestos waste in a range of 4200–17,200 tonnes for Austria in 2020 (Federal Ministry of Austria for Climate Action, Environment, Energy, Mobility, Innovation and Technology, 2023). In comparison, the Porr AG estimates the current volume of MWW at approximately 24,000 tonnes year⁻¹ (Porr AG, 2022).

Additionally, literature review on mineral wool products and waste composition was carried out for this article. The aim was to determine the variation in composition for MWW. Table 1 shows the minimum (min), maximum (max) and average (avg) chemical composition of mineral wool products and waste divided into SW and GW in weight percentage (wt.-%).

Table 1.

Main composition of mineral wool products and waste in weight percentage (wt.-%), data set and literature (Supplemental Material).

in wt.-%	SW (N = 71)			GW (N = 37)
in wt.-%	Min	Max	Avg	Min	Max	Avg
CaO	3.5	46.9	18.5	3.0	9.9	7.7
SiO₂	16.9	60.1	42.5	57.5	68.3	62.8
Al₂O₃	0.8	24.0	14.7	1.3	5.8	2.9
Fe₂O₃	0.4	16.2	7.3	0.0	2.1	0.5
FeO	0.0	8.2	3.7	0.0	0.4	0.2
Na₂O	0.1	8.2	2.4	10.1	17.7	15.5
K₂O	0.3	6.3	1.1	0.0	2.9	0.9
MgO	1.4	14.7	9.2	0.2	4.1	2.7
P₂O₅	0.0	0.8	0.3	0.0	0.6	0.1
TiO₂	0.0	3.3	1.6	0.0	0.6	0.1
B₂O₃	0.0	0.1	0.0	1.1	10.7	4.9
Loss on ignition	1.4	7.4	3.0	0.6	11.9	7.4

Table 1 shows significant variations in CaO, SiO₂, Al₂O₃, Na₂O and B₂O₃ contents comparable to Yliniemi et al. (2021), which may be due to the broader geographical representation of the samples. Overall, there is more variation in the composition of SW than GW as shown in Figure 3. A tracer for GW is a Na₂O content greater than 10 wt.-% and the presence of B₂O₃ (Joint Research Centre et al., 2013).

Mineral wool recycling

Different recycling paths are under investigation to promote a sustainable circular economy without residues and conserve resources. These research projects include various solutions, from innovative landfilling, backfilling and recycling in the cement and mineral wool industry (Sattler et al., 2020) to use as an SCM (Doschek-Held et al., 2022; Steindl et al., 2022, 2023).

This article focuses on using MWW as a future SCM for the cement industry. For example, in 2020, 790,118 tonnes of ground granulated blast furnace slag (GBFS) were used in the Austrian cement industry without milling plants (Mauschitz, 2022). Replacing energy- and CO₂-intensive Portland cement clinker with alternative components from residues makes sense in several respects to: (i) reduce CO₂ emissions from clinker production, (ii) reduce the amount of waste or the need for landfilling and (iii) close material cycles.

The energy technology perspectives of the International Energy Association have shown that heavy industries are changing. Therefore, common cement substitutes such as fly ash from coal combustion and GBFS will not be available in sufficient quantities (Moser et al., 2014). On the way to decarbonising mineral building materials, new clinker substitutes for low-emission and sustainable binders are urgently sought (Favier et al., 2018). The use case of MWW in the binder industry after recycling is also a solution to the problem of landfilling. Recycling, in this case, includes the pretreatment to reduce the volume, the chemical modification to achieve the required composition and the thermal treatment.

Recycled MWW can be used not only as an addition or substitute for ordinary Portland cement (OPC) but also in the production of alkali-activated materials (AAMs). AAMs are alternative binder systems activated by alkaline solutions, such as alkali hydroxides or waterglass, and can be used to produce concrete-like structures. To use MWW in alkali-activated systems, the fibres are mixed with an alkaline solution and a source of silica and alumina, such as fly ash or slag. The mixture is then cured, resulting in a hardened material with properties similar to traditional OPC concrete (Juhart et al., 2020). However, it is essential to carefully evaluate MWW regarding its use in AAMs to ensure that the resulting concrete product meets quality and safety standards and does not release any hazardous materials. Additionally, using AAMs in concrete production is still an ongoing research and development area, and further studies are needed to understand the performance characteristics and long-term durability (Grengg et al., 2020; Mastali et al., 2021; Steindl et al., 2023; Väntsi and Kärki, 2014; Yap et al., 2021; Yliniemi et al., 2019, 2020, 2021; Zhao, 2021).

Materials and methods

The following section describes the input materials used, the process steps for the thermochemical treatment and the analytical methods. The main objective is to modify the chemical and physical properties of the mineral wool using corrective materials and carbothermic reduction to produce an SCM. Furthermore, the characteristics of the conducted material flow analyse is explained. Figure 1 is a schematic depiction of the relations between the different process steps.

Figure 1.

Schematic depiction of the process steps for mineral wool recycling to provide a supplementary cementitious material.

Material characterisation

To effectively carry out the targeted thermochemical treatment of optimised mixtures of mineral wool and correction materials, it is first necessary to perform a chemical characterisation of the materials. The chemical composition of initial and treated materials was determined at Graz University of Technology through X-ray fluorescence spectroscopy on a Tiger S8: Bruker AXS GmbH, Karlsruhe, Germany and Epsilon 4: Malvern Panalytical PLC, Malvern, Worcestershire, UK spectrometer. For the measurement, glass pellets were prepared using lithium metaborate/tetraborate and 0.6–1.0 g of the sample that had been ignited at 950°C to measure the loss on ignition.

The mineralogical composition of the materials was determined by X-ray diffraction using a X’Pert Pro: Malvern Panalytical PLC, Malvern, Worcestershire, UK diffractometer (Co-K_α radiation, 40 kV, 40 mA, range 4 to 85°2θ, 0.008°2θ step size, 45 s count time per step) followed by phase identification and quantification with Highscore Plus 3.0.5: Malvern Panalytical PLC, Malvern, Worcestershire, UK. The amorphous content was determined using NIST SRM 676a as an external standard.

Pretreatment

In order to generate sufficient output material for chemical analysis and the tests regarding the cementitious properties, it is necessary to produce briquettes, as the mineral wool has a low bulk density. The briquettes were produced using a hydraulic briquette press supplied by ATM Recyclingsystems GmbH at a maximum pressure of 13 bar for 3 s. In order to place the mineral wool mats in the press, it was necessary to cut them into smaller pieces of about 10 cm × 10 cm with a utility knife. No binder was added during the briquetting process (Mimra, 2021).

Input materials and mix design

Briquetted SW (Sonorock 035 Rockwool) and GW (type 604818 Isover) were investigated for thermochemical treatment. As correction materials, fly ash from paper production and pure CaO were used to adapt the chemical composition. Three mixtures (M1, M2 and M3) of these materials were evaluated for suitability as an SCM. The chemical composition of the input and correction materials as well as the relative content of the mixtures are presented in Table 2.

Table 2.

Mix proportions of the initial mixtures (M1–M3) for the thermal treatment and main chemical composition of the input materials in weight percentage (wt.-%).

Parameter	SW	GW	Fly ash	CaO
Relative content in wt.-%
M1	49	15	36	–
M2	76	–	–	24
M3	76	3	–	21
Chemical composition in wt.-%
CaO	15.25	7.00	57.81	>98.50
SiO₂	41.01	64.39	14.97	–
Al₂O₃	15.55	1.49	9.98	–
Fe₂O₃	–	–	0.44	–
FeO	3.75	0.19	–	–
Na₂O	1.88	15.23	0.18	–
K₂O	1.17	0.62	0.28	–
MgO	10.32	3.16	2.00	–
P₂O₅	0.35	0.13	0.53	–
TiO₂	1.34	0.06	0.24	–
B₂O₃	0.05	0.08	–	–

The cement and construction industry standards regulate the chemical composition of SCMs. For example, the oxide content and basicities must be within defined limits, see Table 3. The same regulations would apply to recycled mineral wool as a potential SCM, namely a processed slag. For this work, the composition of the targeted slag fraction was predetermined by the goal of using as little correction material as possible. The objective was to mix the input materials beneficially to produce a slag that met the cement and construction industry’s limits. Additionally, the aim was to minimise the metal content by determining and adding the required stoichiometric reducing agent quantity. An MS Excel Solver Add-in was used to perform this mixing calculation (Eisner, 2023). Thereby, the reducing agent amount was calculated with a surplus of 10% and a degree of reduction of 50% for TiO₂, 98% for Fe₂O₃ and 98% for FeO.

Table 3.

Comparison of the slag fraction properties after the thermochemical treatment (M1, M2 and M3) to the requirements.

Parameter	Unit	Requirements	M1	M2	M3
According to ÖNORM B 3309-1 (Austrian Standards Institute, 2010)
CaO+MgO+SiO₂	wt.-%	>67.0	79.4	81.8	80.0
(CaO+MgO)/SiO₂	–	>1.0	1.03	1.04	1.25
Glass content	vol.-%	>67.0	100	100	100
Activity index after 28 days^a)	–	0.9	0.97	1.03	0.95
According to the literature (Blotevogel et al., 2020; Steindl et al., 2022)
R³ heat release after 7 days	J/g_slag	>250	329.6	494.3	438.2
SiO₂	wt.-%	31–39	39.0	33.7	35.6
Al₂O₃	wt.-%	7–18	14.4	15.2	15.9
CaO	wt.-%	32–46	33.9	40.2	36.7
MgO	wt.-%	2–17	6.3	7.9	7.7
FeO	wt.-%	low	0.6	0.2	0.4
TiO₂	wt.-%	low	0.8	1.1	1.0
MnO	wt.-%	low	0.3	0.3	0.3
Na₂O	wt.-%	low	3.0	0.5	0.7

Binder composition: 75% Austrian standard cement (CEM I 42.5 R) and 25% slag.

Thermochemical treatment

The thermochemical treatment was conducted in an inductively heated crucible furnace (InduMelt) constructed at the Chair of Thermal Processing Technology at Montanuniversität Leoben. Approximately 0.7 to 0.8 kg of the mixtures were compacted in a graphite crucible. The test duration for mixture M1 was about 3 hours long with a holding time of 60 minutes at the maximum temperature of 1400°C. Melting of M2 and M3 lasted for 2 hours, including a holding time of 30 minutes. The melting process was followed by selective cooling by wet granulation, where the slag was poured directly into a jet of water generated by a pump. The slag stream was disintegrated into granulates and cooled down rapidly in the water-filled granulation basin. The rapid cooling led to the formation of an amorphous (glass-like) phase, which is crucial for its hydraulic reactivity as an SCM (Hewlett and Liska, 2019). A wet granulation unit was utilised with a water-to-slag ratio of 10 to achieve the necessary cooling rate. Subsequently, a drying step was implemented for 24 hours at 105°C. The dried granules were then crushed to 0.1 mm by a laboratory jaw crusher (Retsch BB50) and screened (Retsch AS2002), followed by magnetic separation of the metal and slag fractions.

Building material tests

The slag fraction after the thermochemical treatment was chemically and mineralogically analysed analogously to the input material characterisation. Furthermore, the cementitious properties, such as the hydraulic reactivity and the corresponding activity index (AI), were determined. As a measure of the ability of the slag powder to react hydraulically, the heat release after 7 days was determined according to the R³ test protocol using a I-Cal-4000HPC: Calmetrix Inc., Arlington, Massachusetts, USA calorimeter (Blotevogel et al., 2020; Li et al., 2018). Additionally, the hydraulic reactivity of the slag fraction in combination with Portland cement was analysed by measuring the AI according to ÖN B 3309-1 (Austrian Standards Institute, 2010) on mortar prisms with a binder consisting of 75% standard cement (CEM I 42.5 R) and 25% test material. This deviation from the test standard ÖNORM EN 15167-1 (Austrian Standards Institute, 2006), requiring a mixture of 50% standard cement and 50% test material, was chosen deliberately to represent better a typical GBFS-containing cement type such as CEM II/B S (Steindl et al., 2022).

Material flow analysis

For the material flow analysis (MFA) implementation, the program STAN 2.6: TU Wien, Institute for Water Quality, Resources and Waste Management (Cencic et al., 2020) is used, which is based on ÖNORM S 2096 (Austrian Standards Institute, 2005). Based on the characterisation results, a MFA was carried out to estimate the substitution potential of MWW as SCM in Austria. In this case, mixture M1 was used as it approximates the assumed production quantity distribution between GW and SW. For this purpose, an accumulation of 14,500 tonnes year⁻¹ SW was assumed as the basis for calculation and compared with the SCM demand for GBFS of the cement industry in Austria of approximately 790,000 tonnes for the year 2020 (Mauschitz, 2022; Porr, 2022). Figure 4 shows the result as a material flow diagram.

Results and discussion

The material characterisation showed as targeted significant differences between the initial mixtures and the resulting slag fractions. Essentially, the CaO, SiO₂, Al₂O₃ and MgO contents were modified to match. The chemical composition of the initial mixtures and the resulting slag fractions are shown in Figure 2.

Figure 2.

Main chemical composition of the initial mixture and the resulting slag fraction after the thermochemical treatment in weight percentage (wt.-%).

The targeted modification of the chemical composition of the resulting slag fractions can be derived. A glass content higher than 97 vol.-% was proven due to amorphous solidification. Further results and a comparison of the obtained parameters with the criteria for SCMs are in Table 3.

Based on the results, the suitability of the slag as a building material after thermal treatment could be demonstrated on the laboratory scale. Glass content, AI and R³ heat release of the generated slags exceed the standard criteria by far. The analytical results of the input materials and mixtures, as well as the resulting slag fractions, are summarised in the ternary plot [SiO₂]–[CaO+MgO]–[Al₂O₃+Fe₂O₃] in Figure 3.

Figure 3.

Ternary plot [SiO₂]–[CaO+MgO]–[Al₂O₃+Fe₂O₃] of the input materials and initial mixtures, as well as the resulting slag fractions after the thermochemical treatment.

This plot also includes an alternative correction material, cement kiln dust, which will be part of further investigations as a source of calcium (Barnat-Hunek et al., 2018). Finally, the result of the MFA to estimate the substitution potential of MWW based on mixture M1 as SCM in the Austrian cement industry is shown in Figure 4.

Figure 4.

Material flow diagram of mixture M1 to estimate the substitution potential of MWW as SCM in the Austrian cement industry in 2020.

This results in a valuable slag recovery potential of approximately 29,000 tonnes annually for the cement industry. This amount could cover about 4% of the Austrian blast furnace slag demand as SCM in 2020. In the ‘Recycling’ process, stocks are created that can be traced back to the gaseous reduction products and treatment losses, which are currently not recorded in detail. The quantification of the corresponding transfer coefficients is part of further investigations and will show the influence of the individual oxides and the treatment conditions on the binder quality. In addition, an intended scale-up will provide a sufficient quantity for the constructional suitability investigation.

Conclusion

It has been demonstrated that the resulting slag fraction meets the defined requirements for the use as an SCM. Future use of such recycled MWW as an SCM can provide several benefits, including reducing waste sent to landfills, conserving natural resources by reducing the need for raw materials or tightening traditional SCMs and reducing the carbon footprint of construction materials.

Based on the findings, a follow-up project, ‘BitKOIN’, has already started. This project includes further development steps, such as the pretreatment and scale-up of thermal treatment. To this end, the project consortium will also evaluate the possibility of using an inductive inline furnace (Bartashov et al., 2022) on a pilot plant scale.

Additionally, purity classification of MWW from different sources must be performed to develop a suitable handling approach. This classification should primarily address the type of mineral wool, contaminants, physical condition and chemical composition. In addition, the influencing and disturbing variables on the material properties (Nagy, 2020; Schultz-Falk et al., 2018;) and quality characteristics during the recycling will be described in more detail. In summary, using mineral wool as an SCM in cement production will provide technical and environmental benefits and is an ongoing research and development area.

Supplemental Material

sj-xlsx-1-wmr-10.1177_0734242X241237199 – Supplemental material for Recycling of mineral wool waste as supplementary cementitious material through thermochemical treatment

Supplemental material, sj-xlsx-1-wmr-10.1177_0734242X241237199 for Recycling of mineral wool waste as supplementary cementitious material through thermochemical treatment by Klaus Doschek-Held, Anna Christine Krammer, Florian Roman Steindl, Theresa Sattler and Joachim Juhart in Waste Management & Research

Footnotes

Declaration of conflicting interests

The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Funding

The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The material characterisations were part of the ‘UpcycSlag-Binder–US-B’ research project, funded by the Styrian Future Fund and the Climate Protection Fund of the City of Graz in the programme ‘Green Tech 100 – 1 Earth, 0 Carbon, 0 Waste’. The pretreatment of the mineral wool was carried out as part of the RecyMin project funded by the Austrian Research Promotion Agency (FFG) under the ‘Bridge’ programme. The ongoing research project ‘BitKOIN’ is also funded by the Austrian Research Promotion Agency (FFG) and carried out as part of the programme ‘FTI-Initiative Kreislaufwirtschaft’.

ORCID iDs

Klaus Doschek-Held

Anna Christine Krammer

Theresa Sattler

Supplemental material

Supplemental material for this article is available online.

References

Austrian Standards Institute (2005) Stoffflussanalyse (Material flow analysis) – Teil 1: Anwendung in der Abfallwirtschaft – Begriffe (Part 1: Application in waste management – Concepts). Wien (Vienna): Austrian Standards Institute.

Austrian Standards Institute (2006) Hüttensandmehl zur Verwendung in Beton, Mörtel und Einpressmörtel – Teil 1: Definition, Anforderungen und Konformatiätskriterien. Wien: ON Österreichisches Normungsinstitut.

Austrian Standards Institute (2010) Aufbereitete, hydraulisch wirksame Zusatzstoffe für die Betonherstellung (AHWZ) (Processed, hydraulic additions for concrete production) – Teil 1: Kombinatationsprodukte (GC/GC-HS) (Part 1: Combination products (GC/GC-HS). Wien (Vienna): Austrian Standards Institute.

Barnat-Hunek

Góra

Suchorab

, et al. (2018) Cement kiln dust. In: Siddique

Cachim

(eds.) Waste and Supplementary Cementitious Materials in Concrete: Characterisation, Properties and Applications. Duxford, UK, Cambridge, MA, Kidlington, UK: WP Woodhead Publishing an imprint of Elsevier, pp. 149–180.

Bartashov

Grass

Sucker

(2022) Der induktive Inline-Ofen für Recycling und Verwertung mineralischer Abfälle und Reststoffe (The induction inline furnace for recycling and recovery of mineral waste and residues). In Pomberger

(ed.) Recy & DepoTech 2022: Vorträge. Leoben: Abfallverwertungstechnik & Abfallwirtschaft Eigenverlag, pp. 717–724.

Blotevogel

Ehrenberg

Steger

, et al. (2020) Ability of the R3 test to evaluate differences in early age reactivity of 16 industrial ground granulated blast furnace slags (GGBS). Cement and Concrete Research 130: 105998.

Cencic

Kelly

Kovacs

(2020) STAN 2.6 - The STANdard for Material Flow Analysis, Version: 2.6.801. Vienna: TU Wien, Institute for Water Quality, Resources and Waste Management, Department of Waste and Resources Managment.

Demacsek

(2021) Presseinformation – Dämmstoffmarkt (Press Release – Insulation Market Austria). Oberwaltersdorf: GDI 2050 – Gebäudehülle+Dämmstoff Industrie 2050.

Doschek-Held

Mimra

Sattler

, et al. (2022) Behandlung von Steinwolle zur stofflichen Verwertung als Sekundärzumahlstoff in der Baustoffindustrie (Recycling of rock wool as a binder component in the building materials industry). In: Pomberger

(ed.) Recy & DepoTech 2022: Vorträge. Leoben: Abfallverwertungstechnik & Abfallwirtschaft Eigenverlag.

10.

Eisner

(2023) Stoffliche Verwertung von Eisenhütten- und Stahlwerksschlacken als Bindemittelkomponenten – Entwicklung eines Mischungsrechners (Recycling of iron and steel slags as a supplementary cementitious material (SCM) – Development of a mixing calculator). Bachelor Thesis, Leoben: Montanuniversität Leoben.

11.

European Commission (2015) Den Kreislauf schließen – Ein Aktionsplan der EU für die Kreislaufwirtschaft (Closing the loop – An EU action plan for the circular economy). Brüssel: COM(2015) 614 final.

12.

European Commission (2019) Der europäische Grüne Deal (The European Green Deal). Brüssel. COM(2019) 640 final.

13.

European Parliament and Council (2018) Directive 2008/98/EC of the European Parliament and of the Council on waste and repealing certain Directives. Brussels: European Union.

14.

Favier

Wolf

de, Scrivener

, et al. (2018) A sustainable future for the European Cement and Concrete Industry: Technology assessment for full decarbonisation of the industry by 2050. Zurich: ETH Zurich.

15.

Federal Ministry of Austria for Agriculture, Forestry, Environment and Water Management (2015) Pflichten bei Bau- oder Abbruchtätigkeiten, die Trennung und die Behandlung von bei Bau- oder Abbruchtätigkeiten anfallenden Abfällen, die Herstellung und das Abfallende von Recycling-Baustoffen – Recycling-Baustoffverordnung (Obligations during construction or demolition activities, the separation and treatment of waste arising from construction or demolition activities, the production and end-of-waste of recycled building materials – Recycling Building Materials Ordinance): RBV. Federal Ministry of Austria for Agriculture, Forestry, Environment and Water Management, BGBLA_2015_II_181. Wien (Vienna): Bundeskanzleramt (Federal Chancellery of Austria).

16.

Federal Ministry of Austria for Climate Action, Environment, Energy, Mobility, Innovation and Technology (2021) Änderung der Deponieverordnung (Landfill Ordinance): DVO 2008. Wien (Vienna): Bundeskanzleramt (Federal Chancellery of Austria).

17.

Federal Ministry of Austria for Climate Action, Environment, Energy, Mobility, Innovation and Technology (2022) Österreich auf dem Weg zu einer nachhaltigen und zirkulären Gesellschaft – Die österreichische Kreislaufwirtschaftsstrategie (Austria on the way to a sustainable and circular society – The Austrian circular economy strategy). Wien (Vienna): Federal Ministry of Austria for Climate Action, Environment, Energy, Mobility, Innovation and Technology.

18.

Federal Ministry of Austria for Climate Action, Environment, Energy, Mobility, Innovation and Technology (2023) Federal Waste Management Plan (BAWP) 2023 – Part 1. Wien (Vienna): Bundeskanzleramt (Federal Chancellery of Austria).

19.

Grengg

Ukrainczyk

Koraimann

, et al. (2020) Long-term in situ performance of geopolymer, calcium aluminate and Portland cement-based materials exposed to microbially induced acid corrosion. Cement and Concrete Research 131: 106034.

20.

Hewlett

Liska

(2019) Lea’s Chemistry of Cement and Concrete. Oxford, Cambridge: Elsevier; BH Butterworth-Heinemann An imprint of Elsevier.

21.

Joint Research Centre, Institute for Prospective Technological Studies, Sissa

, et al. (2013) Best available techniques (BAT) reference document for the manufacture of glass industrial emissions Directive 2010/75/EU: Integrated pollution prevention and control. Publications Office. Brussels: European Union.

22.

Juhart

Gößler

Grengg

, et al. (2020) Material characterization of geopolymer mortar for its beneficial use in composite construction. RILEM Technical Letters 5: 174–185.

23.

Kleemann

Lederer

Rechberger

, et al. (2017) GIS-based analysis of Vienna’s material stock in buildings. Journal of Industrial Ecology 21: 368–380.

24.

Snellings

Antoni

, et al. (2018) Reactivity tests for supplementary cementitious materials: RILEM TC 267-TRM phase 1. Materials and Structures 51: 1–14.

25.

Mastali

Zahra

Hugo

, et al. (2021) Utilization of mineral wools in production of alkali activated materials. Construction and Building Materials 283: 122790.

26.

Mauschitz

(2022) Emissionen aus Anlagen der österreichischen Zementindustrie – Berichtsjahr 2021 (Emissions from plants in the Austrian cement industry – reporting year 2021). Wien: Institut für Verfahrenstechnik, Umwelttechnik und Technische Biowissenschaft.

27.

Mimra

(2021) Recyling von künstlichen Mineralfasern als Sekundärzumahlstoff in der Bindemittelindustrie (Recycling of mineral wool: Treatment of rock wool for the potential utilization as a secondary grinding material in the cement industry). Master thesis, Leoben: Montanuniversität Leoben.

28.

Moser

Leitner

K-H

Steinmüller

(2014) F&E-Fahrplan – Energieeffizienz in der energieintensiven Industrie (R&D Roadmap – Energy efficiency in energy-intensive industry). Wien (Vienna): Climate and Energy Fund.

29.

Mueller

(2009) Recycling mineral wool waste – technologies for the conservation of fiber structure. InterCeram: International Ceramic Review 58: 378–381.

30.

Nagy

(2020) Determination of Thermal Properties of Mineral Wool Insulation Materials for Use in Full-Scale Fire Modelling. Master thesis, Waterloo: University of Waterloo.

31.

Papadopoulos

(2005) State of the art in thermal insulation materials and aims for future developments. Energy and Buildings 37: 77–86.

32.

Pavel

Blagoeva

(2018) Competitive Landscape of the EU’s Insulation Materials Industry for Energy-Efficient Buildings: Revised Edition. Brussels: European Union.

33.

Porr

(2022) Press Release – Mineral Wool Processing Plant. Porr AG, Wien (Vienna).

34.

Saint-Gobain ISOVER Austria GmbH (2019a) Glas Wool – Environmental Product Declaration. Wien (Vienna): Bau EPD GmbH.

35.

Saint-Gobain ISOVER Austria GmbH (2019b) Stone Wool – Environmental Product Declaration. Wien (Vienna): Bau EPD GmbH.

36.

Sattler

Pomberger

Schimek

, et al. (2020) Mineral wool waste in Austria, associated health aspects and recycling options. Detritus 9: 174–180.

37.

Schultz-Falk

Agersted

Jensen

, et al. (2018) Melting behaviour of raw materials and recycled stone wool waste. Journal of Non-Crystalline Solids 485: 34–41.

38.

Sirok

Blagojevic

Bullen

(2008) Mineral Wool: Production and Properties. Cambridge, England: Woodhead Publishing Limited.

39.

Steindl

Doschek-Held

Juhart

, et al. (2022) Mineralische Reststoffe und Nebenprodukte als Bestandteile reaktiver Bindemittelkomponenten (Mineral residues and by-products as components of reactive binder components). In: Pomberger

(ed.) Recy & DepoTech 2022: Vorträge. Leoben: Abfallverwertungstechnik & Abfallwirtschaft Eigenverlag.

40.

Steindl

Doschek-Held

Weisser

, et al. (2023) Mineral residues and by-products upcycled into reactive binder components for cementitious materials. In: Jędrzejewska

Kanavaris

Azenha

Benboudjema

Schlicke

(eds.) International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures: SynerCrete’23 – Volume 2. Springer Nature Switzerland; Imprint Springer, Cham, vol. 44, pp. 153–164.

41.

United Nations (2015) Transformation unserer Welt: Die Agenda 2030 für nachhaltige Entwicklung (Transforming our world: The 2030 Agenda for Sustainable Development). New York: A/RES/70/1.

42.

Väntsi

Kärki

(2014) Mineral wool waste in Europe: A review of mineral wool waste quantity, quality, and current recycling methods. Journal of Material Cycles and Waste Management 16: 62–72.

43.

Yap

Khalid

NHA

Haron

, et al. (2021) Waste mineral wool and its opportunities-a review. Materials (Basel, Switzerland) 14: 5777.

44.

Yliniemi

(2020) Report about mineral wool waste composition and quality variability. University of Oulu.

45.

Yliniemi

Luukkonen

Kaiser

, et al. (2019) Mineral wool waste-based geopolymers. IOP Conference Series: Earth and Environmental Science 297: 12006.

46.

Yliniemi

Ramaswamy

Luukkonen

, et al. (2021) Characterization of mineral wool waste chemical composition, organic resin content and fiber dimensions: Aspects for valorization. Waste Management (New York, N.Y.) 131: 323–330.

47.

Zhao

(2021) Circular economy strategy for mineral wool wastes: potential secondary raw material for Alkali Activated Materials (AAMs). School of Architecture and the Built Environment, KTH Royal Institute of Technology.

Supplementary Material

Please find the following supplemental material available below.

For Open Access articles published under a Creative Commons License, all supplemental material carries the same license as the article it is associated with.

For non-Open Access articles published, all supplemental material carries a non-exclusive license, and permission requests for re-use of supplemental material or any part of supplemental material shall be sent directly to the copyright owner as specified in the copyright notice associated with the article.

0.00 MB

0.04 MB