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Special Issue "Special Functional and Environmental Cement-Based Materials"

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Guest Editor

School of Civil ＆ Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China
Interests: cement concrete; smart concrete; durability; thermoregulation cement-based materials
Special Issues, Collections and Topics in MDPI journals

Dr. Lin Chi

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Guest Editor

School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Interests: special cement; nanomaterials; conductive concrete; functional concrete; durability of cement concrete

Special Issue Information

Dear Colleagues,

Smart cement-based materials or functional cement-based materials have been proposed for several years. Due to the social demand for multifunctional cement-based materials, different types and functions of cement-based materials have been continuously developed, just like conductive cement-based materials, which can be used for the self-sensing and snow melting and deicing. Additionally, phase change cement-based materials can be used to regulate indoor temperature changes and reduce energy consumption.

In addition to functional properties, environmental protection and energy conservation in cement production and use are also very important. Solid wastes, such as recycled concrete, river silt ceramsite, incineration waste fly ash cement-based materials, slag concrete, and phosphogypsum brick have attracted many scholars' attention. Additionally, the use of CO₂ in the curing of cement-based materials has been proposed. CO₂ curing can not only improve the mechanical strength of some cement-based materials but also solidify the toxic and harmful substances in curing materials.

We look forward to receiving your contributions.

Dr. Hui Wang
Dr. Lin Chi
Guest Editors

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Keywords

solid waste
special cement
CO₂-cured concrete
durability of concrete
phase change material
smart concrete

Published Papers (2 papers)

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Research

Open AccessArticle

The Influence of the Thermal Treatment of Copper Slag on the Microstructure and Performance of Phosphate Cements

Rania Derouiche

Patrick Ninla Lemougna

Guillermo Meza Hernandez

Jun Gu

Samir Baklouti

and

Hubert Rahier

Materials 2023, 16(18), 6249; https://doi.org/10.3390/ma16186249 - 17 Sep 2023

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Abstract

In general, phosphate cements have a very rapid setting reaction at room temperature. The same holds for copper slag-based phosphate cements. This means that using them as a binder, for instance as mortar, is always possible on a small scale, but very difficult on a large scale. In this paper, the heat treatment of the copper slag was shown to be an effective way to increase the setting time and keep the mix workable for an adequate period. The main objective of this research was to examine the changes in the phase composition of quenched copper slag after exposure to 500 °C and to evaluate the impact of these changes on the reactivity of the material in an acidic environment, as well as on the mechanical properties, microstructure, and structure of the produced phosphate cement materials. Various experimental methods were utilized to characterize the raw materials and the obtained phosphate cementitious materials, including isothermal microcalorimetry (TAM Air), thermogravimetric analysis (TGA), infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), as well as the determination of the chemical composition using X-ray fluorescence (XRF) and the particle size distribution. Furthermore, compressive strength tests were conducted to gauge the mechanical resistance of the materials. The main findings of this work revealed that subjecting the copper slag to a thermal treatment of 500 °C induced a partial transformation in its structure. The high temperature caused the oxidation of some of the divalent iron oxide in the slag, leading to the formation of hematite. This treatment increased the setting time and reduced the reactivity of the copper slag with phosphoric acid, ultimately enabling the production of a dense phosphate-based cementitious material with outstanding mechanical properties. The compressive strength of the newly developed cement was recorded to be greater than 78.9 MPa after 7 days, and this strength continued to increase, reaching 82.5 MPa after 28 days. Full article

(This article belongs to the Special Issue Special Functional and Environmental Cement-Based Materials)

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Open AccessArticle

Influence of Citric Acid on the Fundamental Properties of CO₂ Cured Magnesium Oxysulfate Paste

Houchao Sun

Feiting Shi

and

Hui Wang

Materials 2023, 16(3), 1315; https://doi.org/10.3390/ma16031315 - 03 Feb 2023

Cited by 1 | Viewed by 875

Abstract

Magnesium oxysulfate (MOS), mainly composed of magnesium oxide and magnesium sulfate, is a kind of gas-hardening cementing material with low energy consumption and CO₂ emissions. In order to develop environment-friendly cement-based materials, MOS needs to be studied systematically. The paper mainly investigates the influence of citric acid (a retarder) on the working and mechanical properties of MOS paste. In this study, the setting time of fresh MOS paste is determined. The flexural and compressive strengths of hardened specimens exposed to the environment of water dry-wet (D-W) alternations, freeze-thaw (F-T) cycles, and sulfate D-W alternations are investigated. Furthermore, the drying shrinkage (D-S) rate of MOS paste is tested for 3 days and 28 days. The specimens are cured in standard or CO₂ curing environments. A scanning electron microscope energy spectrum (SEM-EDS) is obtained to analyze the morphology of hydration products. Results show that citric acid can increase the setting time of MOS paste. The citric acid and CO₂ curing have a positive effect on the mechanical strengths and the resistance to erosion by water, F-T cycles, and sulfate D-W alternations. The D-S rate decreased in relation to the increasing dosages of citric acid and increased with CO₂ curing. MOS with 0.3% of the total binder material mass shows the best erosion resistance. As observed in the results of SEM-EDS, the CO₂ curing and the citric acid can make the hydration products denser. Full article

(This article belongs to the Special Issue Special Functional and Environmental Cement-Based Materials)

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