Synthesis, characterization and hydration analysis of Ba2+-, Cu2+- or Bi3+-doped CaO–Al2O3–ZrO2-based cements

Madej, Dominika; Boris, Renata

doi:10.1007/s10973-019-08142-7

Cited by 13 publications

(4 citation statements)

References 22 publications

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“…It is important to mention that no diffraction peaks from Al or Ni were detected, indicating that these metal ions have partly incorporated into the ZnO crystal lattice. [ 49,50 ] Also, by Rietveld analysis, it was confirmed that the lattice parameters and volume of the crystal were decreased slightly, which may be due to the dopant modification.…”

Section: Resultsmentioning

confidence: 94%

Carbon Dioxide Detectors based on Al‐ and Ni‐Doped ZnO

Lozano-Rosas

Hernandez

Elizalde-González

et al. 2022

Physica Status Solidi (a)

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Humanity all around the world currently faces two serious challenges: global warming and the COVID-19 pandemic. It is well known that the earth's atmosphere is composed of greenhouse gases that act as a shielding blanket, keeping the global temperature in an optimal range. [1] The three main greenhouse gasses which have presented a significant increment in the course of the industrial period are carbon dioxide (CO 2 ), methane (CH 4 ), and nitrous oxide (N 2 O). [2] CO 2 plays a primary role in global warming because of its production due to a wide range of sources like manufacturing processes, automobiles, human respiration, decomposition, ocean release, etc. [3] In contrast, from December 2019 to date, the COVID-19 pandemic is causing a global impact on every sector of society. [4] One of the strategies of mitigation for the pandemic has been CO 2 concentration monitoring in enclosed spaces to measure indoor ventilation requirements and thus reduce the risk of contagion by the aerosol transmission of the virus. Also, it is clear that CO 2 monitoring has become mandatory to maintain air quality.The values of CO 2 concentration in outdoor ambient air are %400 ppm. [5] Regarding CO 2 concentrations in internal environments, the reality is different depending on the country, specific location, and ventilation system; however, according to the document "Recommendations for operation and maintenance of air conditioning and ventilation systems of buildings and premises for the prevention of the spread of SARS-Cov-2" from Spanish Ministry of Health, for good quality air, it is considered that the concentration of CO 2 in the indoor environment with respect to its concentration in the outdoor environment, should not be higher than 500 ppm. [6] ðCO 2 indoor À CO 2 outdoorÞ < 500 ppm CO 2(1)The first decade of the 21 st century was witness to massive production of sensors, [7] driven principally by the growing concern of global warming. However, new sensing technologies were emerged in the past decade, such as calorimetric sensors (CB), metal-oxide-semiconductor field-effect transistor (MOSFET), conducting polymer sensors, electrochemical sensors (EC), metal-oxide semiconductor (MOS), optical sensors, quartz crystal microbalance (QMB), and surface acoustic wave (SAW). [8] Among these, MOS sensors are mostly investigated, due to their excellent sensitivity, very short response times, low cost, minimal noise, small size, low power consumption for adequate battery life, detection of both oxidizing and reducing gases, easy fabrication, and are excellent candidates for miniaturization with high portability. [9][10][11] There is a wide variety of metal oxides employed for CO 2 detection, including pristine materials:

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Section: Resultsmentioning

confidence: 94%

Carbon Dioxide Detectors based on Al‐ and Ni‐Doped ZnO

Lozano-Rosas

Hernandez

Elizalde-González

et al. 2022

Physica Status Solidi (a)

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“…Meanwhile, the presence of metal cations could influence the sintering behavior and the hydration kinetics of clinker in CAC. In this regard, cations doped in cementitious materials can be replaced with metal ions present in hydrates, resulting in distortion of the crystalline lattice [39]. In addition, the form of calcium aluminate can be changed by various cations, such as Na + , K + , Mg 2+ , Fe 3+ , and Si 4+ [40][41][42].…”

Section: Hydration Characteristics Of Cacmentioning

confidence: 99%

Review on recent advances in securing the long-term durability of calcium aluminate cement (CAC)-based systems

Kim

Son

Lee

2021

Funct. Compos. Struct.

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With growing demand for the development of multifunctional, high-performance, and high durable construction materials, numerous studies on calcium aluminate cement (CAC)-based cementitious materials having various desirable characteristics, such as heat and chemical resistance, have been widely conducted. CAC has monocalcium aluminate as the main clinker, provides fast hardening and short setting time, and is mainly used for self-leveling mortar and repair materials. Nevertheless, the phase transition of the main hydrates of CAC under high temperature and moisture conditions causes a strength loss at later age, and ultimately makes one to face difficulties securing long-term durability of CAC-based cementitious materials. This paper summarizes recent literatures in the area of hydration characteristics and mechanical properties of CAC-based materials. In addition, this paper covers various methods for suppressing the phase transition of CAC in literatures, and promotes the utilization of CAC as an advanced construction material with the possibility of securing long-term durability.

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“…Furthermore, minor elements within alternative raw materials or fuels influence the clinkering process 11 . The nature and quantity of these constituents can lead to notable changes in various aspects, including the morphology and proportion of the clinker phases 12 , the formation of minor phases 13 , the optimal clinkerisation temperature 14 , kiln residence time 15 , melt phase viscosity 16 , transformations on cooling 17 , the polymorphism of the main phases 18 , and the clinker reactivity 19 . In this scenario, thermodynamic modelling is an alternative tool to consider all these variables and to expand the scope of usable alternative materials.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic modelling of cements clinkering process as a tool for optimising the proportioning of raw meals containing alternative materials

Costa,

Coppe,

Bielefeldt

et al. 2023

Sci Rep

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The valorisation of waste or by-products in Portland clinker production is a promising alternative for developing sustainable cements. The complexity of the chemical reactions during clinkering demands an adequate dosing method that considers the effect of feedstock impurities to maximise the potential substitution of natural resources by waste or by-products, while guaranteeing the clinker reactivity requirements. This study proposes a raw meal proportioning methodology for optimising co-processing of natural feedstocks with alternative raw materials in clinker production, intending to reduce the content of natural raw materials needed, while promoting an optimal clinker reactivity. A thermodynamic modelling sequence was developed considering the variability of raw materials composition and heating temperatures. The model was then validated by comparing simulation outcomes with results reported in previous studies. An experimental case study was conducted for validation of the proposed method using a spent fluid catalytic cracking catalyst (SFCC), a by-product from the oil industry as an alternative alumina source during clinkering. The modelling simulations indicated that substitution of natural feedstocks by 15 wt% SFCC promotes the formation of reactive clinkers with more than 54% tricalcium silicate (C3S). Mixes with the potential to form the highest C3S were then produced, and heating microscopy fusibility testing was applied for evaluating the clinkers’ stability. The main factors governing the reactivity and stability of the clinker phases were the melt phase content, alumina modulus, and formation of C3S and dicalcium silicate (C2S). The self-pulverisation of clinker during cooling was observed in selected mixes, and it is potentially associated with high viscosity and low Fe content in the melt phase. The proposed framework enables optimisation of the dosing of raw meals containing alternative alumina-rich feedstocks for clinker production and allows a deeper interpretation of limited sets of empirical data.

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Synthesis, characterization and hydration analysis of Ba2+-, Cu2+- or Bi3+-doped CaO–Al2O3–ZrO2-based cements

Cited by 13 publications

References 22 publications

Carbon Dioxide Detectors based on Al‐ and Ni‐Doped ZnO

Carbon Dioxide Detectors based on Al‐ and Ni‐Doped ZnO

Review on recent advances in securing the long-term durability of calcium aluminate cement (CAC)-based systems

Thermodynamic modelling of cements clinkering process as a tool for optimising the proportioning of raw meals containing alternative materials

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