Studies on influence of characteristics of surfactant and foam on foam concrete behaviour

Sahu, Sritam Swapnadarshi; Gandhi, Indu Siva Ranjani

doi:10.1016/j.jobe.2021.102333

Cited by 24 publications

(8 citation statements)

References 34 publications

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“…To study the aggregation of cement particles on the surface of the bubble liquid film, the contact angle and adhesion of the cement particles were tested (Figure ). Previous studies have found that crystals with a contact angle of less than 40° were difficult to adsorb on the surface of the liquid film, and a stable, thick-walled bubble can be formed with a contact angle of 40–90°. , The contact angle of the crystals of ordinary composites is less than 30° (Figure a,d), and the adhesion is less than 12 mN/m (Figures b,e). After adding VAE, the BSNSC formed, the contact angle and adhesion of the cement particles increased, the solid phase thickened, and the bubble stability improved.…”

Section: Resultsmentioning

confidence: 86%

Biomimetic Swallow Nest Structure: A Lightweight and High-Strength Thermal Insulation Material

Zheng

Zuo

2022

ACS Nano

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A common method for reducing carbon emissions and the load-bearing pressure of buildings, and while also achieving improved energy conservation is to prepare porous magnesium-based lightweight composites to reduce waste and environmental hazards. However, due to internal stress, the pores of traditional lightweight composites crack easily and collapse, resulting in composites that are brittle with poor water resistance. These materials cannot achieve both low density and high strength, which limits their application in advanced functional materials. Thus, learned from nature, inspired by swallow’s nest, a solution has been proposed, which is a simple and fast chemical arrangement and assembly method. Using bamboo scraps as the supporting framework and methylcellulose (MC) molecular chains as the templates, 5-phase crystals are grown and arranged on the MC. These crystals are arranged on the bamboo scraps by chemical means with MC acting as a bridge. At the same time, using the high viscosity and flexibility of the vinyl acetate/ethylene (VAE) copolymer emulsion and the formation of magnesium acetate chelate from VAE and hydration products, crystals and bamboo scraps can be assembled. Through these organic–inorganic copolymers, an intercalated and integrated biomimetic swallow nest structure is formed. The biomimetic swallow nest structure composites (BSNSC) imitated the formation process of a natural swallow nest. It is a lightweight material with a thick wall, low connectivity rate, and regular shape. Its density is 0.42 g/cm3, which is still in the density class of ultralight inorganic foam materials, and its compressive strength reaches 6.5 MPa, three times that of ordinary composites. The structure has a strength-to-weight ratio 3.5 times that of ordinary composites and a thermal conductivity much lower than of other thermal insulation materials. In the future, this type of lightweight composites with high strength, high heat insulation, and low density not only functions as a good energy-saving material for buildings but also a good thermal insulation material in the aerospace field.

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Section: Resultsmentioning

confidence: 86%

Biomimetic Swallow Nest Structure: A Lightweight and High-Strength Thermal Insulation Material

Zheng

Zuo

2022

ACS Nano

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“…It is because the increased foam stability by CMC and the thickness of the foam liquid film lead to the rupture of the foam in the cement slurry being mitigated. In addition, the pore size of the bubbles becomes more refined and uniform, which improves the compressive strength of the foam concrete [ 19 ]. However, with the increase of CMC admixture, the foam content inside the slurry increases and the porosity becomes larger, reducing the strength of the foam concrete, and explaining the reduction in compressive strength present after reaching the peak.…”

Section: Resultsmentioning

confidence: 99%

“…At the same time, the compressive strength of foam concrete increased by 20%. In addition, adding CMC to a surfactant solution improves the surfactant’s viscosity and the foam’s microstructure [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

The Stabilizing Effect of Carboxymethyl Cellulose on Foamed Concrete

Sun

2022

IJMS

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Foam concrete is widely used for its excellent properties, such as light weight, heat insulation, fire resistance, and sound insulation. The stability of foam is the main factor that affects the mechanical performance of foam concrete. The experiments are designed from two perspectives: the foam’s stability performance and the foam concrete’s modification effect. The effects on foam volume, foam half-life, foam bleeding rate, and foam pore size were investigated based on different concentrations of foam stabilizer CMC (0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%). A combination of macroscopic testing and microscopic analysis, a comparative study of dry density, water absorption test, mechanical property test, and pore structure analysis were conducted after using the modified foam for foam concrete. It is shown that the addition of CMC has an enhanced effect on foam stability. Foaming volume, water secretion rate, and average pore size showed a decreasing trend with the increase of CMC admixture, while the foam half-life displayed an increasing trend. In addition, adding CMC reduces the dry density and improves water absorption and compressive strength. The pore structure development of foam concrete has a noticeable improvement effect, and the optimal amount of admixture is 0.4%. Research results provide a reference for applying thickening foam stabilizer CMC in foam concrete.

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“…Demir ve ark. (2019) yapıkları köpük beton çalışmasında 600-660 kg/m3 arasında birim hacim ağırlığa sahip beton örneklerinin basınç dayanımı 1,72-2,64 MPa arasında değiştiği vurgulanmıştır [22,23]. Köpük betonda birim hacim ağırlığı betonun basınç mukavemeti ile ters ilişkidedir [24].…”

Section: Gi̇ri̇ş (Introduction)unclassified

Köpük Beton Üretiminde İnşaat Yıkıntı Atığı İnce Agregası Kullanımı ve Optimum Su/Çimento Oranının Belirlenmesi

ÖZÇELİK¹,

Şimşek

2024

Politeknik Dergisi

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The supply of raw materials in the construction sector causes the rapid decrease or destruction of our natural resources. Recycling of construction demolition waste in order to reduce the reduction or destruction of natural resources will reduce the need for raw materials as well as environmental pollution. In this study, the feasibility of producing foam concrete with fine (sand) aggregate from construction debris was investigated. Foam concrete was produced with 5 different water/cement ratios by using construction debris that passed through a 4 mm sieve as aggregate in the mixtures. The properties such as unit volume weight, compressive strength, water absorption ratio, ultra sound transmission rate and thermal conductivity coefficients of the produced foam concrete samples were investigated. The most suitable of these properties gave a mixture design with a W/C ratio of 0.45.

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Studies on influence of characteristics of surfactant and foam on foam concrete behaviour

Cited by 24 publications

References 34 publications

Biomimetic Swallow Nest Structure: A Lightweight and High-Strength Thermal Insulation Material

Biomimetic Swallow Nest Structure: A Lightweight and High-Strength Thermal Insulation Material

The Stabilizing Effect of Carboxymethyl Cellulose on Foamed Concrete

Köpük Beton Üretiminde İnşaat Yıkıntı Atığı İnce Agregası Kullanımı ve Optimum Su/Çimento Oranının Belirlenmesi

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