Pore Structure, Morphology, and Strength of Self-Compacting Foam Material Backfilled Behind the Underground Pipe-Wall of Yellow River

Zhao, Jianhua; Deng, Yansong; Gao, Peiwei; Lü, Xiaolin; Zhang, Jun; Zong, Jianjun

doi:10.3390/ma13245724

Cited by 4 publications

(1 citation statement)

References 21 publications

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“…Pore structure plays a vital role in the performance of foam concrete [ 15 , 21 , 22 , 23 ]; porosity, pore uniformity, pore size, and pore shape factor can determine the macrostructure of FC (frost resistance, compressive strength, thermal conductivity, impermeability, sound absorption, etc.) [ 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Mechanical and Durability Characteristics of Fly Ash Foam Concrete

Yan

et al. 2022

Materials

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Although fly ash foam concrete (FAFC) is lightweight, heat-retaining, and insulating, its application options are constrained by its weak construction and short lifespan. The effects of various dosage ratios of the foaming agent (i.e., hydrogen peroxide), silica fume, and polypropylene fiber on the dry density, compressive strength, thermal insulation performance, pore structure parameters, and durability of FAFC were analyzed in this study, which sought to address the issues of low strength and low durability of FAFC. According to the findings, there is a negative correlation between the amount of hydrogen peroxide (as the foaming agent) and compressive strength, and, as the silica fume and polypropylene fiber (PP fiber) content rise, the strength will initially rise and then fall. The distribution of pore sizes gradually shifts from being dominated by small pores to large pores as the amount of foaming agent increases, while the porosity and average pore size gradually decrease. When the hydrogen peroxide content is 5%, the pore shape factor is at its lowest. The pore size distribution was first dominated by a small pore size and thereafter by a large pore size when the silica fume and PP fiber concentration increased. Prior to increasing, the porosity, average pore size, and pore shape factor all decreased. Additionally, the impact of PP fiber on the freeze–thaw damage to FAFC was also investigated at the same time. The findings indicate that the freeze–thaw failure of FAFC is essentially frost heave failure of the pore wall. The use of PP fiber is crucial for enhancing FAFC’s ability to withstand frost. The best frost resistance is achieved at 0.4% PP fiber content. In conclusion, the ideal ratio for overall performance was found to be 5% hydrogen peroxide content, 4% silica fume content, and 0.1% polypropylene fiber content. The results obtained could be applied in different fields, such as construction and sustainable materials, among others.

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Section: Introductionmentioning

confidence: 99%

Investigating the Mechanical and Durability Characteristics of Fly Ash Foam Concrete

Yan

et al. 2022

Materials

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Stability, flexural behavior and compressive strength of ultra-lightweight fiber-reinforced foamed concrete with dry density lower than 100 kg/m3

Falliano

Parmigiani

Suarez-Riera

et al. 2022

Journal of Building Engineering

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Expansion Properties of Cemented Foam Backfill Utilizing Coal Gangue and Fly Ash

Wang

Zhang

et al. 2022

Minerals

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The cemented backfill (CB) utilizing coal gangue (CG) and fly ash (FA) is widely applied in coal mines. However, the bleeding and shrinkage of CB leads to insufficient contact with surrounding rock, which is not beneficial for controlling roof subsidence and even stope stability. Herein, a cemented foam backfill (CFB) formulation is demonstrated, employing hydrogen dioxide (H2O2) as a chemical foaming agent. The cement and FA show noticeable inhibiting effects on volume expansion due to the network formed by their hydrates. Moderately lower cement, FA, and solid concentration are beneficial to improve volume increment and prolong expanding duration. A foaming coefficient (k) is proposed in theory to evaluate the foaming efficiency. The kem values, determined by volume evolution experiments of CFB slurries, provide a calculation basis for the needed dosage of H2O2 solution targeting specific volume increment. CFB specimens with expanding ratios of 21%~103% and densities of 994~592 kg/cm3 were prepared, with an actual foaming coefficient of 52.40 cm3/g and uniaxial compressive strength (UCS) of 0.32~0.55 MPa. The mass of H2O2 solution was 1.9%~11.3% of cement and 0.29%~1.67% of total solid materials by weight. The UCS decline compared to CB was attributed to rich pores observed by CT and carbonation indicated by X-ray diffraction (XRD).

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Pore Structure, Morphology, and Strength of Self-Compacting Foam Material Backfilled Behind the Underground Pipe-Wall of Yellow River

Cited by 4 publications

References 21 publications

Investigating the Mechanical and Durability Characteristics of Fly Ash Foam Concrete

Investigating the Mechanical and Durability Characteristics of Fly Ash Foam Concrete

Stability, flexural behavior and compressive strength of ultra-lightweight fiber-reinforced foamed concrete with dry density lower than 100 kg/m3

Expansion Properties of Cemented Foam Backfill Utilizing Coal Gangue and Fly Ash

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