Effects of various sizes of cenospheres on microstructural, mechanical, and thermal properties of high-strength and lightweight cementitious composites

Yang, Jingwei; Mahato, Jyoti; Moon, Juhyuk

doi:10.1016/j.jobe.2023.107214

Cited by 3 publications

(2 citation statements)

References 45 publications

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“…Haddadian et al [22] used coal bottom ash and found that CBA(0%) had 12.96% water absorption, while CBA(25%) had 20.15%. Majhi et al [24] found that SF(0%) had 17.1% water absorption, but adding SF(10%) reduced it to 11.3%. Kim [26] found that adding 50% slag and CS resulted in 33.71% water absorption, while adding 50% slag alone increased it to 36.20%.…”

Section: Durability Propertymentioning

confidence: 99%

“…Beddu et al[23] investigation discovered that utilizing cenosphere instead of ordinary cement boosted the concrete's strength by 59.6% to 28.8 Mpa. Majhi et al[24] research revealed that employing silica fume as a cement substitute resulted in a strength of 30 Mpa, but without the substitution, the strength reduced by 6.25% to 32 Mpa. Yang et al[25]experiment discovered that utilizing CS as a substitute for cement resulted in a strength of 60 Mpa, but using SF resulted in a strength of 92 Mpa, a 34.78% reduction.…”

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confidence: 99%

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Review of Mechanical, Durability, and Thermal properties of Light weight concrete containing cenosphere

Jose,

Radhakrishnan,

Anandan

et al. 2024

E3S Web of Conf.

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Compared to conventional concrete, lightweight concrete offers a reduced unit weight, making it easier to handle and transport. Its popularity has surged globally in numerous countries and has proven beneficial for construction purposes. Lightweight concrete often exhibits better thermal insulation properties compared to traditional concrete, contributing to energy efficiency in buildings. Recently, the inclusion of cenospheres in lightweight aggregates is being is heavily researched around the world. Ceneosphere addition increases the volume of the concrete mixture because of their smaller size and hollow nature of the particle. This research paper showcases the various applications and advantages of lightweight concrete (LWC) containing cenosphere, along with highlighting the role of different supplementary cementitious materials characteristics and manufacturing methods. Furthermore, the current study examines previous researches on sustainable lightweight concretes and showcases the improvements and advancements in mechanical, durability, and thermal properties obtained when cenospheres were added.

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Section: Durability Propertymentioning

confidence: 99%

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confidence: 99%

Review of Mechanical, Durability, and Thermal properties of Light weight concrete containing cenosphere

Jose,

Radhakrishnan,

Anandan

et al. 2024

E3S Web of Conf.

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Lightweight insulating oil-well cement filled with hollow glass microspheres and numerical simulation of its unsteady heat transfer process

Wang,

Ma,

Yuan

et al. 2024

Adv Compos Hybrid Mater

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During subsea natural gas extraction, the free water and gas molecules present in the reservoir and the low-temperature and high-pressure conditions of the subsea environment cause the formation of hydrates; the blockage of the wellbore due to these hydrates is a critical issue that affects ow safety.Located between the wellbore and casing, well cement plays an important role in strengthening the wellbore and sealing off the oil, gas, and water layers. A cement that exhibits optimal mechanical strength and enhanced thermal insulation properties can contribute to preventing hydrate formation.However, research on such materials is rare. In this study, lightweight and thermally insulated (LWTI) composites with the desired mechanical strength for deep-sea natural gas development were prepared using oil-well cement (OWC) as the matrix and hollow glass microspheres (HGM) as the ller. A twophase mathematical model of the HGM/OWC LWTI composites was developed using the COMSOL Multiphysics software and solved using the nite element method. A transient heat transfer analysis of the HGM/OWC LWTI composites was performed. The effective thermal conductivities (k eff ) of the HGM/OWC LWTI composites were measured and the values agreed well with the simulation results. The k eff of the composites was approximately 0.371 W/(m•℃) when the HGM (D51.8) content was 40 vol.%.Compared to the traditional OWC (thermal conductivity ~ 0.889 W/(m•℃)), the thermal insulation performance of the HGM/OWC LWTI composites was signi cantly improved. In addition, the density, mechanical properties, and water absorption of the HGM/OWC LWTI composites were investigated. The densities of the HGM/OWC LWTI composites were found to be low, ranging from 1.31 to 1.94 g/cm 3 . The HGM/OWC LWTI composites exhibited good compressive strength and low permeability. Thus, HGM/OWC LWTI has promising applications in the thermal insulation of cemented wellbores for deepsea natural gas development.

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Possibilities to Recycle Thermal Power Plant By-Products in Refractory Castables

Škamat,

Boris,

Malaiškienė

et al. 2024

Sustainability

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The current research focuses on the analysis of fly ash cenospheres (FACs), a waste generated in coal-fired power plants, and the possibilities of using them in refractory castables. Cenospheres are micro-scale (~50–400 µm) spherical structures derived from fly ash, predominantly composed of silica and alumina oxides (86.7%). Their distinctive morphology and characteristics make them highly advantageous for a diverse array of applications, notably as lightweight fillers and nondegradable pore-forming agents. Furthermore, cenospheres have the potential to contribute significantly to the performance of refractory castables when incorporated into compositions with calcium aluminate cement (CAC). FAC XRD analysis revealed that FACs mainly consist of mullite along with cristobalite, which forms at higher temperatures. Furthermore, the study examined the impact of FACs on the properties of medium cement castable (MCC), especially durability, when 3%, 5%, and 7% of fine fireclay were replaced by FACs; 5% of FACs were found to reduce the density of refractory castables and decrease the cold crushing strength by approximately 6%, but it increased the resistance to thermal shock by approximately 75% and 43%, depending on the thermal treatment temperature, 950 °C and 1100 °C, respectively, and improved resistance to alkali corrosion. A higher FAC content (7%) does not have any positive effect on the MCC properties tested.

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Effects of various sizes of cenospheres on microstructural, mechanical, and thermal properties of high-strength and lightweight cementitious composites

Cited by 3 publications

References 45 publications

Review of Mechanical, Durability, and Thermal properties of Light weight concrete containing cenosphere

Review of Mechanical, Durability, and Thermal properties of Light weight concrete containing cenosphere

Lightweight insulating oil-well cement filled with hollow glass microspheres and numerical simulation of its unsteady heat transfer process

Possibilities to Recycle Thermal Power Plant By-Products in Refractory Castables

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