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Design and Analysis of Inorganic-Polymer Composite Materials for Circular Economy

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Composites and Nanocomposites".

Deadline for manuscript submissions: 20 October 2025 | Viewed by 928

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Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech Republic
Interests: experimental and theoretical analysis of heat; moisture and chemical compounds transport in porous materials; materials design; building materials engineering; polymeric materials
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Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Prague, Czech Republic
Interests: materials design; eco-innovations; alkali-activation; smart building materials; sustainable construction; recycled materials; life cycle assessment; reinforced polymers
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The production of building materials generates a high number of negative externalities associated with greenhouse gas emissions, the exploitation of natural resources, and the landfilling of waste materials in particular. These circumstances, together with the high-energy intensity of the sector, are the reason why great emphasis is placed on the transformation of the construction sector, including the use of less energy-intensive binders, the intensification of material reuse, and the abandonment of landfilling. These goals meet the sustainable principles related to the preservation of the natural environment and the target set by the Paris Agreement based on the reduction in CO2 emissions.

Inorganic polymers (geopolymers or, in a broader sense, alkali- and acid-activated materials) represent a family of materials with diverse chemical and mineralogical structures according to used mixture constituents. Besides the benefits associated with high compressive strength, resistance to elevated temperatures, and aggressive environments, substantial improvements include the valorization of waste materials and the complete replacement of Portland cement, and thus a significant reduction in CO2 emissions. This broad range of materials is often combined with various admixtures to obtain composites with desired material properties.

The primary aim of this Special Issue is to present possible applications of inorganic polymer-based composites in the building industry based on the characterization of their material properties. Manuscripts focused on new experimental techniques or composite design approaches are also welcome.

Prof. Dr. Robert Černý
Dr. Jan Fořt
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • inorganic polymers
  • geopolymers
  • composites
  • building materials
  • building industry
  • circular economy

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Published Papers (1 paper)

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Research

22 pages, 2942 KB  
Article
From Waste to Binder: Alkali Activation of Blended Brick and Metakaolin Residues for Design of Circular Construction Materials
by Martin Mildner, Petr Hotěk, Martina Záleská, Robert Černý and Jan Fořt
Polymers 2025, 17(20), 2720; https://doi.org/10.3390/polym17202720 - 10 Oct 2025
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Abstract
Alkali-activated materials (AAMs) offer a promising low-carbon alternative to Portland cement, but their development has been dominated by fly ash and slag, whose availability is increasingly limited. This research explores waste brick powder (WBP) and metakaolin residue (RN), two abundant yet underutilized by-products, [...] Read more.
Alkali-activated materials (AAMs) offer a promising low-carbon alternative to Portland cement, but their development has been dominated by fly ash and slag, whose availability is increasingly limited. This research explores waste brick powder (WBP) and metakaolin residue (RN), two abundant yet underutilized by-products, as blended precursors for sustainable binder design. The novelty lies in demonstrating how complementary chemistry between crystalline-rich WBP and amorphous RN can overcome the drawbacks of single-precursor systems while valorizing construction and industrial residues. Pastes were prepared with varying WBP/RN ratios, activated with alkaline solutions, and characterized by Vicat setting tests, isothermal calorimetry, XRD with Rietveld refinement, MIP, SEM, and mechanical testing. Carbon footprint analysis was performed to evaluate environmental performance. Results show that WBP reacts very rapidly, causing flash setting and limited long-term strength, whereas the incorporation of 30–50% RN extends setting times, sustains dissolution, and increases amorphous gel formation. These changes refine the formed reaction products, leading to compressive strengths up to 39 MPa and flexural strengths of 8 MPa at 90 days. The carbon footprint of all blends remained 392–408 kg CO2e/m3, thus providing about a 60% improvement compared to conventional Portland cement paste. The study establishes clear design rules for waste-derived blended precursors and highlights their potential as circular, low-carbon binders. Full article
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