Preparation of nano-carbon black and silica fume modified foam concrete: Compressive strength, pore structure and electromagnetic property

Bai, Ying-hua; Lü, Yao; Zhang, De-yue

doi:10.1016/j.conbuildmat.2023.130553

Cited by 20 publications

(4 citation statements)

References 21 publications

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“…Foamed concrete, created by integrating non-porous foam materials into cement-based materials, effectively addresses the issue of poor impedance matching. As electromagnetic waves traverse the complex pores of this material, multiple interfaces cause reflections and scattering, gradually attenuating their energy [50]. Figure 11 shows a schematic diagram of its function.…”

Section: Electromagnetic Wave Absorptionmentioning

confidence: 99%

Alkali-activated Rice Husk Ash-Foamed Concrete: Correlation between Microporous Structure, Hydration Characteristics and Hardening Properties

Bai,

Xie,

Chen

2024

Preprint

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Solid waste recycling plays a crucial role in environmental protection and energy conservation. This study explores the utilization of rice husk ash as an auxiliary binding material in the production of alkali-activated foamed concrete. The impact of the modulus of the alkaline activator on the dry density, water absorption rate, thermal conductivity, electromagnetic wave absorption, and compressive and flexural strength of rice husk ash-foamed concrete was investigated. Additionally, the foamed concrete's micro-pore structure and hydration characteristics were characterized. For the first time, the study reveals the correlation between the pore structure, hydration products, and hardening properties of alkali-activated rice husk ash-foamed concrete. The results demonstrate that with a decrease in the modulus of the alkaline activator, the presence of accessible OH- ions in the colloid increases, leading to an improvement in the pore structure of alkali-activated rice husk ash-foam concrete and an increase in hydration products. The reduction in interconnected pores, increase in tiny pores, and higher C-S-H gel and ettringite content in the hydration products directly impact the development of concrete strength, reduction in dry density and water absorption rate, and decrease in thermal conductivity. Alkaline activation, through optimizing the pore structure, enhances the attenuation constant and impedance matching of the alkali-activated rice husk ash-foam concrete matrix, enhancing its electromagnetic wave absorption capability. In conclusion, the overall results suggest that alkali-activated rice husk ash-foam concrete is a viable material for energy-efficient and environmentally friendly construction.

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Section: Electromagnetic Wave Absorptionmentioning

confidence: 99%

Alkali-activated Rice Husk Ash-Foamed Concrete: Correlation between Microporous Structure, Hydration Characteristics and Hardening Properties

Bai,

Xie,

Chen

2024

Preprint

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“…Currently, research on coral concrete mainly focuses on mechanical properties and durability [22][23][24][25][26]. However, due to the limited construction area on islands and the poor construction environment, raw materials obtained from dredging ports and waterways cannot be well screened and cleaned, resulting in some marine biological impurities being included in them [27].…”

Section: Introductionmentioning

confidence: 99%

Effects of Marine Shellfish on Mechanical Properties and Microstructure of Coral Concrete

Zhao,

Wu,

Akbar

et al. 2023

Buildings

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Using coral debris as coarse and fine aggregates and seawater as mixing water has been proposed to address transportation and material shortage issues in island and reef construction projects. However, the utilization of coral may result in impurities, such as shellfish and other marine organisms, which could impact the mechanical properties of the resulting concrete. The goal of this study is to find out how different amounts of shellfish and marine organism impurities affect the mechanical properties and microstructure of coral concrete. This study builds on the process of making full coral concrete. Substitution optimization is carried out using the response surface method (RSM), with the polynomial work expectation serving as a validation measure. The experimental findings indicate that impurities have an insignificant impact on the mechanical properties of coral concrete when their dosage is below 2%, causing a decrease of only around 6%. The mechanical properties of coral concrete containing shellfish and marine organism impurities exhibit a strong correlation at 28 days. SEM and XRD analysis revealed that the primary factor contributing to the decline of mechanical properties in coral concrete with shellfish and marine organism impurities is the weak strength of the impurity shell structure, in addition to the rehydration of internal biomass during the cement hydration process, leading to the formation of numerous small pores within the coral concrete. The results of an ANOVA test indicate that the model is statistically significant, with a p-value of less than 0.05.

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“…Wave-absorbing materials are categorized into three main types: resistive-loss type, magnetic-loss type, and dielectric-loss type depending on the type of loss. Resistive-loss type nanomaterials (such as carbon black, − graphene, − carbon nanotubes, − etc.) are mainly used to detect electromagnetic waves by interacting with electric fields and have the advantages of high electrical conductivity loss and narrow density.…”

Section: Introductionmentioning

confidence: 99%

Review of Dielectric Carbide, Oxide, and Sulfide Nanostructures for Electromagnetic Wave Absorption

Lu,

Zhang,

Liu

et al. 2023

ACS Appl. Nano Mater.

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Following the growth of infotech and electronic industries, electromagnetic-wave-absorbing materials play an essential role in the traction of the need for high-precision weaponry and intelligent electronic equipment. The exploitation of high-performance electromagnetic-wave-absorbing materials has emerged as a strategic challenge to be solved in the upgrading of military equipment and civil electromagnetic security. The more maturely studied absorbing materials (carbon, ferrite, etc.) have a single loss mechanism and poor resistance matching, which are already not enough to cover the basic needs. To explore absorbing materials that satisfy both impedance matching and attenuation balance, dielectric nanomaterials have come to the fore. They can realize light weight, thin layer, broad band, and multiband, which have great application prospects. In this review, we start with a summary of typical dielectric loss mechanisms (interfacial polarization, dipole polarization, and conduction loss). Next, diverse carbides, oxides, sulfides, and their composites with dielectric or magnetic materials are described, and the nanostructure advantages and wave-absorbing performance advantages are investigated. Then, the applications of wave-absorbing materials are depicted. Lastly, the challenges faced by dielectric-type materials are outlined, and future development trends are foreseen. Overall, this review offers an overview of the advances in the study of dielectric nanoabsorbing materials.

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Preparation of nano-carbon black and silica fume modified foam concrete: Compressive strength, pore structure and electromagnetic property

Cited by 20 publications

References 21 publications

Alkali-activated Rice Husk Ash-Foamed Concrete: Correlation between Microporous Structure, Hydration Characteristics and Hardening Properties

Alkali-activated Rice Husk Ash-Foamed Concrete: Correlation between Microporous Structure, Hydration Characteristics and Hardening Properties

Effects of Marine Shellfish on Mechanical Properties and Microstructure of Coral Concrete

Review of Dielectric Carbide, Oxide, and Sulfide Nanostructures for Electromagnetic Wave Absorption

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