Preparation and characterization of indoor heat blockage panel composites made of polyurethane-hybrid-foam-concrete and rice-husk-ash

Jofrishal, Jofrishal; Siregar, Tongku Nizwan; Yusibani, Elin; Akhyar, Akhyar; Rahmayani, Ratu Fazlia Inda; Fajri, Rahmatul

doi:10.1016/j.heliyon.2023.e18925

Cited by 4 publications

(1 citation statement)

References 50 publications

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“…Its pore structure heavily influences foamed concrete's thermal insulation and heat transfer properties. The ability of foamed concrete to insulate and transfer heat depends on the thermal transport of gaseous phases within the pores [20]. Rice husk ash, which has a high silica content, can alter the pore structure of foamed concrete, reducing its thermal conductivity [21].…”

Section: Introductionmentioning

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: Introductionmentioning

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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Thermal and structural analysis of n-heptadecane-applied form-stable heat storage aggregate integrated rice husk ash-red clay boards for improving building energy efficiency

Jeong,

Kim,

Chang

et al. 2024

Applied Thermal Engineering

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Alkali‐activated rice husk ash‐foamed composites: Correlation between pore structure, hydration, and hardening properties

Bai,

Xie,

Chen

2024

Int J Applied Ceramic Tech

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Solid waste recycling plays a crucial role in environmental protection and energy conservation. This study explores 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 (RHA)‐foamed composites. Additionally, the foamed composite's micropore 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 RHA‐foamed composites. The study found that decreasing the modulus of the alkaline activator increased the amount of OH− ions available in the gel, and the number of micropores (r ≤ .1 µm) in the foamed composites increased from 7.1903% to 21.3156%. This resulted in the refinement of pore sizes and optimization of heat transfer paths. Meanwhile, increasing the C–S–H gel composition in the hydrated products improved its compressive and flexural strength. When the alkali modulus reaches 1, 28 days foamed composites display compressive strength of 8.33 MPa and thermal conductivity of .1404 W/(m·K). Furthermore, the superior pore structure improved the electromagnetic wave absorption of the foamed composites, yielding a reflection loss value of −12.02 dB.

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Preparation and characterization of indoor heat blockage panel composites made of polyurethane-hybrid-foam-concrete and rice-husk-ash

Cited by 4 publications

References 50 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

Thermal and structural analysis of n-heptadecane-applied form-stable heat storage aggregate integrated rice husk ash-red clay boards for improving building energy efficiency

Alkali‐activated rice husk ash‐foamed composites: Correlation between pore structure, hydration, and hardening properties

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