Characteristics of new cement-based thermoelectric composites for low-temperature applications

Liu, Xiaoli; Qu, Ming; Nguyen, Alan Phong Tran; Dilley, N. R.; Yazawa, Kazuaki

doi:10.1016/j.conbuildmat.2021.124635

Cited by 13 publications

(9 citation statements)

References 32 publications

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“…e composites, such as the ZnO/expanded graphite, graphene/ZnO nanoinclusions, and graphite/ MnO 2 , can dramatically increase the electrical conductivity and thermoelectric efficiency of the cement composites [43][44][45]. Based on the received results, we would increase the electrical conductivity of the cement composites with added Cu 2 O powder by doping the Cu 2 O crystals or compositing the Cu 2 O particles with conductive materials in the following work [19,44].…”

Section: Ermoelectric Properties Of the Cement Composites Withmentioning

confidence: 99%

“…However, semiconductive materials cannot increase the electrical conductivity of cement-based materials significantly, resulting in low thermoelectric efficiency of cement-based materials. One research strategy to solve this problem is increasing the electrical conductivity of cement-based materials by introducing conductive materials [17,18]. Another research strategy is further increasing the Seebeck coefficient of cement-based materials by modifying the semiconductive materials.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Thermoelectric Efficiency of Cement-Based Materials with Cuprous Oxide for Sustainable Buildings

Zhang

et al. 2022

Advances in Materials Science and Engineering

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The thermoelectric effect of plain cement paste is usually weak. To improve the thermoelectric performance of cement composites, functional components, such as carbon fibers, steel fibers, carbon nanotubes, and graphene, are often added to cement paste. In view of the advantage of metal oxides with a higher band gap, pure cuprous oxide crystals with different particle sizes were synthesized by a hydrothermal method and incorporated into the cement matrix to improve the thermoelectric efficiency of cement composites in this study. Pure cuprous oxide crystals with different particle sizes (15 μm, 1.5 μm, and 100 nm) were prepared by controlling the reaction temperature and time, pH value, amount of reducing agent, and polyvinylpyrrolidone in the reaction system. The Seebeck coefficient, electrical conductivity, and thermal conductivity of the cement composites with 5.0 wt.% nanostructured Cu2O powder increased to 3966 ± 54 μV/K, (2.68 ± 0.12) × 10−4 S/m, and 0.69 ± 0.007 W/(m·K), respectively. Thereby, a high figure of merit value of 1.93 × 10−6 was obtained for the cement composites, which made future application of cement composites in energy harvesting for buildings possible.

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Section: Ermoelectric Properties Of the Cement Composites Withmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Thermoelectric Efficiency of Cement-Based Materials with Cuprous Oxide for Sustainable Buildings

Zhang

et al. 2022

Advances in Materials Science and Engineering

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“…The impact of different man-made materials with electrically conductive particles on mineral matrices have been esteemed for the following materials: carbon black [28], asphaltene [35], steel shaving [34], slag [37], industrial carbon [42], fly ash [38], powdered coke [43], carbon-contained slag from aluminum production [2]. All that researches have provided enough data to make a conclusion that the impact of morphology, size of particles and distribution on structure formation is much more significant than the role of the content.…”

Section: -391 the Study Of The Properties Of Nanomaterialsmentioning

confidence: 99%

“…In recent years active researches have been carried out in the field of increasing the antistatic protection and functional load of traditional structural materials and antistatic coatings by regulating electrical properties [33][34][35][36]. This interest to concrete as an electrically conductive material is caused by the prospects of construction, electric power, and other branches of technology provided reproducible results are obtained [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Carbon-containing modifier for fluoranhydrite binder

Gordina¹,

Gumenyuk²,

Polyanskikh³

et al. 2022

Nanobuild

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Introduction.In order to widen the functionality of construction and building materials and widespread electrically conductive building constructions, it is highly recommended to reduce cost of the solutions. This can be achieved by replacing binders with the industrial by-products. At the same time, there are a few articles about adjustment of electrically conductive properties of materials based on by-product binders and this field is of a great importance. Also, highly dispersed particles in modifiers and their role might be considered as important to find out, especially when such additives are used to improve structure and properties of composites. Methods and materials. To study the possibility of controlling the electrical properties of the matrix, compositions based on fluoroanhydrite, sodium sulfate as a hardening activator, and UPC-MIX-1 suspension as an electrically conductive additive, were made. The effect of UPC-MIX-1 suspension on the electrical performance and structure formation of a mineral matrix containing dispersed carbon black particles was studied. The polydisperse nature of the modifying additive and the ratio of the nanodispersed and microdispersed parts of the solid phase were determined. Indicators for calculating the specific volumetric electrical resistance were determined by the probe method. The influence of the dispersed additive on the characteristics of the fluoroanhydrite composite was evaluated by standard laboratory methods. Features of structure formation were evaluated using the methods of physicochemical analysis. Results and discussion. It was confirmed that a fluoranhydrite-based mineral binder with sodium sulfate has moderate physical mechanical properties and might be used as a substitute for gypsum binder. The usage of an electrically conductive additive as a modifier enhances such mechanical properties as flexural compressive strength and compressive strength which increase by 51% and 65% correspondingly. Also, hydro physical properties have been improved, for instance the coefficient of softening for the FD-4 sample has increased by 39%, and the water absorption by mass for the same sample has decreased by 36%. Specific volume electrical resistance has decreased by 49-52% and equals13,6 kOm • cm, 8% of electrically conductive additive being added. The physical and technical properties of the presented composite are due to significant changes of the physical and chemical properties including the features of structure formation. Conclusions. The obtained compositions require extra optimization in order to be used as a heating component. At the same time, the achieved electrical conductivity is sufficient to level the electrostatic effect of self-leveling floors. Regularities in the formation of the structure of the fluoroanhydrite composite have been established, which manifest themselves in the formation of a larger number of contacts for the intergrowth of crystalline hydrate new formations ensured by the presence of a nanodispersed part in the modifying additive.

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“…A review of existing studies shows that the first attempts to regulate the electrical properties of cement matrices were first described in [ 10 , 11 ]. There are three types of electrically conductive structures formed in the mineral matrix: cluster [ 12 , 13 ], linear [ 14 ], and complex [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Study of the Structure and Properties of Electrical Sand Concrete under Prolonged Exposure to Sulfate Environment

et al. 2022

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Destructive processes accompanying sulfate corrosion of concrete significantly affect the durability of products and structures based on Portland cement. In the presented study, the long-term effect of sulfate corrosion on the electrical properties of electrically conductive sand concrete was studied. In the course of the study, the following were tested: an electrically conductive composition and a control composition based on plain Portland cement. The analysis of changes in the mineral composition of the samples over the course of time in an aggressive solution was carried out. The results show that during the exposure period of the samples from 28 to 224 days, the absorption of sulfate ions slows down and averages 26% for the control composition and 29% for the electrically conductive composition, of the total volume of absorbed sulfates. At the same time, the course of sulfate corrosion was accompanied by a 6% increase in the density of samples of both compositions, as well as a cyclic change in mechanical strength within 15%. In its turn, the key indicator of the electrical characteristics of the compositions—electrical resistivity—tended to increase throughout the experiment. These results can be recommended for assessing the durability and the nature of the operating conditions of electrical concretes used in aggressive environments.

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Characteristics of new cement-based thermoelectric composites for low-temperature applications

Cited by 13 publications

References 32 publications

Enhanced Thermoelectric Efficiency of Cement-Based Materials with Cuprous Oxide for Sustainable Buildings

Enhanced Thermoelectric Efficiency of Cement-Based Materials with Cuprous Oxide for Sustainable Buildings

Carbon-containing modifier for fluoranhydrite binder

Study of the Structure and Properties of Electrical Sand Concrete under Prolonged Exposure to Sulfate Environment

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