Application of organic- and nanoparticle-modified foams in foamed concrete: Reinforcement and stabilization mechanisms

She, Wei; Du, Yi; Miao, Changwen; Liu, Jiaping; Zhao, Guotang; Jiang, Jiuchuan; Zhang, Yunsheng

doi:10.1016/j.cemconres.2018.01.020

Cited by 200 publications

(43 citation statements)

References 17 publications

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“…When the mass fraction of nanoparticle reaches 1.5%, the foam stability increases by more than 6 times when compared to the control group, although the foaming capacity of the nanoparticle is 35% lower than that of the control group [163]. Nano-silica adsorbed on the surface of the air bubble can increase the viscosity of the bubble shell and inhibit the coalescence of air bubbles [169]. Yekeen et al [170] found out that adding SiO 2 nanoparticles into the liquid film of surfactant-contained foam improved the foam dynamic stability.…”

Section: Measures To Improve the Stability Of Air Bubbles In Fresh Comentioning

confidence: 99%

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A Review on Bubble Stability in Fresh Concrete: Mechanisms and Main Factors

et al. 2020

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In order to improve the stability of air bubbles in fresh concrete, it is of great significance to have a better understanding of the mechanisms and main influencing factors of bubble stability. In the present review, the formation and collapse process of air bubbles in fresh concrete are essentially detailed; and the advances of major influencing factors of bubble stability are summarized. The results show that the surface tension of air–liquid interface exerts a huge impact on bubble stability by reducing surface free energy and Plateau drainage, as well as increasing the Gibbs surface elasticity. However, surface tension may not be the only determinant of bubble stability. Both the strength of bubble film and the diffusion rate of air through the membrane may also dominate bubble stability. The application of nano-silica is a current trend and plays a key role in ameliorating bubble stability. The foam stability could be increased by 6 times when the mass fraction of nano-particle reached 1.5%.

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Section: Measures To Improve the Stability Of Air Bubbles In Fresh Comentioning

confidence: 99%

“…She et al [169] Viscometer XCT Precision system (YXLON, Germany) Nano-silica could slow the coalescence and disproportionation of bubbles and increase the viscosity of the bubble wall, thus preventing gas transfer and drainage between gaseous and liquid phases.…”

Section: Research Testing Apparatus Primary Conclusion Summarymentioning

confidence: 99%

A Review on Bubble Stability in Fresh Concrete: Mechanisms and Main Factors

et al. 2020

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“…Note that the type of cement and the type of additive acting individually made a low contribution (0.6% and 1.4%, respectively) to the number of pores, but the interaction between these factors made a high contribution of approximately 17%. It is known that additives act to reduce the surface tension of water or the deflocculation via a change in the electric charge of the particles of the cement [66]. Therefore, the additives reduce the consistency of the mortar, thereby increasing its fluidity, and making the mortar more fluid, which may offer less physical resistance to maintaining the structure of the air bubbles incorporated by the foam [26,67].…”

Section: Air Voidmentioning

confidence: 99%

Effect of Additives, Cement Type, and Foam Amount on the Properties of Foamed Concrete Developed with Civil Construction Waste

et al. 2019

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The main objective of this study was to evaluate the use of additives in producing foamed concrete blocks, which were made by totally replacing natural sand with civil construction waste (CCW). The concrete blocks were developed in accordance with an experimental design that used the complete factorial statistical method, for which three factors with different levels were considered: cement type (CP-V, CP II-Z, and CP II-F); use of additive (without additive, plasticizer, air entrainment, and superplasticizer) and foam amount (5.7%, 7.7%, and 9.5% of the total mass). The influence of each factor and the interactions between them were assessed on the following response variables: compressive strength, dry and saturated density, air voids, water absorption, and thermal conductivity. The results show that all factors had a significant influence on the variable response. For example, the use of the superplasticizer additive resulted in higher compressive strength, lower density, lower air void, and lower thermal conductivity. Finally, the use of additives had little influence on the response variables in relation to the other factors.

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“…Foam concrete has been traditionally used in separating panels, filling, and cushioning materials. However, recent advances in FC technology have seen their use in applications where a high-performance material is required [2][3][4][5][6][7][8][9][10], e.g., highways, military, civil engineering, and aviation [11][12][13][14][15]. Foam concrete has been successfully used in the backfilling of underground projects such as building compensation foundation treatment, and it can be used to widen the roadbed to effectively reduce differential settlement [16,17].…”

Section: Introductionmentioning

confidence: 99%

Minimizing Drying Shrinkage and Enhancing Impermeability of Foam Concrete Modified with Epoxy Resin

Gong

2020

Advances in Civil Engineering

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Relatively high drying shrinkage and permeability were two of the major challenges associated with foam concrete (FC), primarily due to its high porosity nature. This study was aimed at reducing the drying shrinkage and improving the impermeability of FC by blending and modifying it with epoxy resin (EP). Extensive laboratory testing yielded an optimum content of 4.0% EP, corresponding to a minimum drying shrinkage rate of 1.47 mm/m, which was 48% lower than that of the unmodified FC. At this optimum dosage of 4.0% EP, the permeability pressure was at a maximum level of 1.4 MPa, whereas the permeability coefficient was at its lowest value of 0.75 × 10−9 mm/h. Internal pore structure and EP distribution were characterized using the scanning electron microscopy and indicated that a microgrid structure of the FC was formed internally, featuring an increase in the number of pores, a reduction in the average pore size, and a uniform pore size distribution. Similarly, surface energy measurements using the tensiometry method yielded maximum surface energy values at 4.0% EP content, which could be used to explain the reduced drying shrinkage and the enhanced impermeability characteristics of the modified FC.

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Application of organic- and nanoparticle-modified foams in foamed concrete: Reinforcement and stabilization mechanisms

Cited by 200 publications

References 17 publications

A Review on Bubble Stability in Fresh Concrete: Mechanisms and Main Factors

A Review on Bubble Stability in Fresh Concrete: Mechanisms and Main Factors

Effect of Additives, Cement Type, and Foam Amount on the Properties of Foamed Concrete Developed with Civil Construction Waste

Minimizing Drying Shrinkage and Enhancing Impermeability of Foam Concrete Modified with Epoxy Resin

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