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Circular Economy - Supplementary Cementitious Materials in Binders: Processing, Design, Characterization and Performance

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Construction and Building Materials".

Deadline for manuscript submissions: closed (10 March 2022) | Viewed by 4785

Special Issue Editors

Dr. Bogdan Stefan Vasile

E-Mail Website
Guest Editor
Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 060042 Bucharest, Romania
Interests: inorganic materials; re-generating (raw) materials; end-of-life products; innovative bionanomaterials; transmission electron microscopy
Special Issues, Collections and Topics in MDPI journals
Dr. Adrian Ionut NICOARA

E-Mail Website
Guest Editor
National Research Center for Micro and Nanomaterials, Department of Science and Engineering of Oxide Materials and nanomaterials, Faculty of Applied Chemistry and Materials Science, POLITEHNICA University of Bucharest, 011061 Bucharest, Romania
Interests: binders materials science; geopolymer materials; alkalie-activated materials; cement physical and chemical characterization techniques; end-of-life materials; waste management
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

As a result of the aggressive consumption of resources, we must give up the existing linear economic models (extraction of raw materials, product processing, use, and waste storage) and adopt new models for sustainable management. Recycling is an essential part of ensuring this connection between the beginning and the endpoint of the industrial process, by rehabilitating materials in the production process.

The main objective of this Special Issue is to extend knowledge and highlight new supplementary cementitious materials (SCMs) that can be used in partial replacement of Portland cement. Additionally, it seeks to promote the processing, characterization, and creation of innovative designs for preserving the performance of cement/concrete, and using reactivated end-of-life materials in the circular economy context.

Dr. Bogdan Stefan VASILE
Dr. Adrian Ionut NICOARA
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. Materials 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 2600 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

  • Circular economy
  • End-of-life materials: advanced characterization
  • SCMs activation and characterization
  • Concrete/cement performance evaluation
  • Recycled materials
  • New binders design and processing.

Published Papers (2 papers)

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Research

18 pages, 8199 KiB  
Article
Fly-Ash Evaluation as Potential EOL Material Replacement of Cement in Pastes: Morpho-Structural and Physico-Chemical Properties Assessment
by Bogdan Stefan Vasile, Adrian-Ionut Nicoara, Vasile-Adrian Surdu, Vladimir Lucian Ene, Ionela Andreea Neacsu, Alexandra Elena Stoica, Ovidiu Oprea, Iulian Boerasu, Roxana Trusca, Mirijam Vrabec, Blaz Miklavic, Saso Sturm, Cleva Ow-Yang, Mehmet Ali Gulgun and Zeynep Basaran Bundur
Materials 2022, 15(9), 3092; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15093092 - 24 Apr 2022
Viewed by 1953
Abstract
The main objective of the study was to produce alternative binder materials, obtained with low cost, low energy consumption, and low CO2 production, by regenerating end-of-life (EOL) materials from mineral deposits, to replace ordinary Portland cement (OPC). The materials analyzed were ash [...] Read more.
The main objective of the study was to produce alternative binder materials, obtained with low cost, low energy consumption, and low CO2 production, by regenerating end-of-life (EOL) materials from mineral deposits, to replace ordinary Portland cement (OPC). The materials analyzed were ash and slag from the Turceni thermal power plant deposit, Romania. These were initially examined for morphology, mineralogical composition, elemental composition, degree of crystallinity, and heating behavior, to determine their ability to be used as a potential source of supplementary cementitious materials (SCM) and to establish the activation and transformation temperature in the SCM. The in-situ pozzolanic behavior of commercial cement, as well as cement mixtures with different percentages of ash addition, were further observed. The mechanical resistance, water absorption, sorptivity capacity, resistance to alkali reactions (ASR), corrosion resistance, and resistance to reaction with sulfates were evaluated in this study using low-vacuum scanning electron microscopy. Full article
(This article belongs to the Special Issue Circular Economy - Supplementary Cementitious Materials in Binders: Processing, Design, Characterization and Performance)
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16 pages, 9513 KiB  
Article
Influence of Alkali Activator Type on the Hydrolytic Stability and Intumescence of Inorganic Polymers Based on Waste Glass
by Adrian Ionut Nicoara and Alina Ioana Badanoiu
Materials 2022, 15(1), 147; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15010147 - 25 Dec 2021
Cited by 5 | Viewed by 2074
Abstract
The main objective of this study is the synthesis and characterization of low cost alkali-activated inorganic polymers based on waste glass (G-AAIPs) using a mixture of NaOH and Ca(OH)2 as alkali activators, in order to improve their hydrolytic stability. This paper also [...] Read more.
The main objective of this study is the synthesis and characterization of low cost alkali-activated inorganic polymers based on waste glass (G-AAIPs) using a mixture of NaOH and Ca(OH)2 as alkali activators, in order to improve their hydrolytic stability. This paper also presents detailed information about the influence of composition determined by X Ray Diffraction (XRD), microstructure determined by Scanning Electronic Microscopy (SEM) and processing parameters on the main properties of G-AAIP pastes. The main factors analyzed were the glass fineness and the composition of the alkaline activators. The influence on intumescent behavior was also studied by heat treating of specimens at 600 °C and 800 °C. The use of Ca(OH)2 in the composition of the alkaline activator determines the increase of the hydrolytic stability (evaluated by underwater evolution index) of the G-AAIP materials compared to those obtained by NaOH activation. In this case, along with sodium silicate hydrates, calcium silicates hydrates (C-S-H), with good stability in a humid environment, were also formed in the hardened pastes. The highest intumescence and an improvement of hydrolytic stability (evaluated by underwater evolution index and mass loss) was achieved for the waste glass powder activated with a solution containing 70% NaOH and 30% Ca(OH)2. The increase of the waste glass fineness and initial curing temperature of G-AAIPs have a positive effect on the intumescence of resulted materials but have a reduced influence on their mechanical properties and hydrolytic stability. Full article
(This article belongs to the Special Issue Circular Economy - Supplementary Cementitious Materials in Binders: Processing, Design, Characterization and Performance)
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