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Properties and Applications of Cement-Based Composites (2nd Edition)
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Properties and Applications of Cement-Based Composites (2nd Edition)

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

Deadline for manuscript submissions: closed (20 August 2024) | Viewed by 2502

Special Issue Editor

Dr. Hyeong-Ki Kim

E-Mail Website
Guest Editor
Department of Architectural Engineering, Chosun University, Gwangju 61452, Republic of Korea
Interests: materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Cement is an indispensable binder for modern construction and has been used for structural and nonstructural purposes for centuries. Although cement is sometimes neglected because it is a very familiar material, it is also one of the most stable binders available to humans, offering infinite possibilities. Various types of inorganic binders similar to cement have been proposed for full replacement or partial inclusion in order to provide construction materials with unique properties. Moreover, cement can be seen not only as a basic material for concrete but also as a functional binder that is different from metals or polymers. This Special Issue aims to expand the knowledge on new types of properties and application areas for cement composites.

Dr. Hyeong-Ki Kim
Guest Editor

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

  • portland cement
  • alternative cementitious binders
  • structural and nonstructural members
  • conventional and novel use of cement composite
  • multifunctional cement composite

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Related Special Issue

Published Papers (2 papers)

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Research

16 pages, 6090 KiB  
Article
Research on Deterioration Behavior of Magnesium Oxychloride Cement Under High Humidity and High Temperature
by Lingyun An, Ziyi Wang, Leichao Meng, Chenggong Chang, Zhifu Zhou and Fengyun Yan
Materials 2024, 17(21), 5226; https://doi.org/10.3390/ma17215226 - 26 Oct 2024
Viewed by 980
Abstract
To clarify the deterioration behavior of magnesium oxychloride cement (MOC) under conditions of high humidity and high temperature, we first placed MOC slurry samples in a simulated environment with a relative humidity of 97 ± 1% and a temperature of 38 ± 2 [...] Read more.
To clarify the deterioration behavior of magnesium oxychloride cement (MOC) under conditions of high humidity and high temperature, we first placed MOC slurry samples in a simulated environment with a relative humidity of 97 ± 1% and a temperature of 38 ± 2 °C; then, we observed the changes in the macroscopic and microscopic morphology, water erosion depth, bulk density, phase composition, and mechanical properties of the samples. The results show that, over time, under the promotion of high temperature, water molecules infiltrate the MOC samples. This results in the appearance of cracks on the macroscopic surface of the MOC samples due to the volume expansion caused by the hydrolysis of P5 (5Mg(OH)2·MgCl2·8H2O) and the hydration of unreacted active MgO in the samples. The microscopic morphology of the samples changes from needle/gel-like, to flake-like, and finally leaf-like. Simultaneously, the major phase composition turns into Mg(OH)2. Since the structure of the samples becomes looser and the content of the main strength phase decreases, the overall compressive strength and flexural strength are both reduced. The compressive strength of the MOC slurry samples (0 day) is 93.2 Mpa, and the flexural strength is 16.4 MPa. However, after 18 days of treatment, water molecules reach the center of the MOC samples, and the MOC samples completely lose their integrity. As a result, their compressive and flexural strengths cannot be obtained. Full article
(This article belongs to the Special Issue Properties and Applications of Cement-Based Composites (2nd Edition))
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14 pages, 1597 KiB  
Article
Assessment of the Radioactivity, Metals Content and Mineralogy of Granodiorite from Calabria, Southern Italy: A Case Study
by Luigi Dattola, Alberto Belvedere, Maurizio D’Agostino, Giuliana Faggio, Domenico Majolino, Santina Marguccio, Giacomo Messina, Maurizio Messina, Antonio Francesco Mottese, Giuseppe Paladini, Valentina Venuti and Francesco Caridi
Materials 2024, 17(15), 3813; https://doi.org/10.3390/ma17153813 - 2 Aug 2024
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Abstract
In this paper, an assessment of the natural radioactivity level, radon exhalation, metal contamination, and mineralogy of a granodiorite rock sample from Stilo, in the Calabria region, Southern Italy is presented as a case study. This rock was employed as a building material [...] Read more.
In this paper, an assessment of the natural radioactivity level, radon exhalation, metal contamination, and mineralogy of a granodiorite rock sample from Stilo, in the Calabria region, Southern Italy is presented as a case study. This rock was employed as a building material in the area under study. The specific activity of 226Ra, 232Th and 40K natural radioisotopes was assessed through high-purity germanium (HPGe) gamma-ray spectrometry. Then, several indices such as the absorbed gamma dose rate (D), the annual effective dose equivalent (AEDE), the activity concentration index (ACI) and the alpha index (Iα), were quantified to determine any potential radiological health risk related to radiation exposure from the analyzed rock. Furthermore, E-PERM electret ion chambers and inductively coupled plasma mass spectrometry (ICP-MS) measurements were carried out to properly quantify the radon exhalation rate and any possible metal pollution, respectively. In particular, to further address metal pollution factors, the geo-accumulation index (Igeo) was calculated to properly address the toxicity levels of the ecosystem originating from the detected metals. Finally, with the aim of successfully discriminating the provenance of such naturally occurring radionuclides, a combined approach involving X-ray diffraction (XRD) and µ-Raman spectroscopy was employed for the identification of the main radioisotope-bearing minerals characterizing the investigated granodiorite. The results achieved in this case study can be taken as the basis for further inquiries into background levels of radioactivity and chemical contamination in natural stone employed as building materials. Full article
(This article belongs to the Special Issue Properties and Applications of Cement-Based Composites (2nd Edition))
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