Three-phase-foams for foam concrete application

Krämer, Christina; Schauerte, Matthias; Kowald, Torsten; Trettin, R.

doi:10.1016/j.matchar.2015.03.004

Cited by 70 publications

(33 citation statements)

References 7 publications

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“…The distribution of the pores and the size of the cavity are favored by the low granulometry of the aggregate, thus generating smaller densities. Another interesting aspect is that within the macropores there was a growth of crystals ( Figure 5), which is also reported by Mehta and Monteiro [31,38]. The distribution of the pores, the mean diameter, and the area occupied by the air-voids were evaluated using image analysis, namely ImageJ software following Hilal et al [58].…”

Section: Characterization Of Afcbmentioning

confidence: 61%

“…Similarly, when a greater volume of foam is added, the bubbles rupture because the thickness of the hydrophilic film has been reduced, thereby making them less resistant to the forces of the material medium. However, the results demonstrated that water content changes the interaction between bubbles/mortar and changed the stability of the hydrophilic film of foam [38,53,58]. formed by the bubbles are distributed throughout the area evaluated and are of uniform size, with the maximum diameter being approximately 0.5 mm.…”

Section: Characterization Of Afcbmentioning

confidence: 96%

“…However, this difference can be explained by the granulometry of the aggregate. The higher the granulometry of the aggregates, the higher the diameter of the bubbles, whereas the lower the granulometry, the smaller the diameter of the bubbles; moreover, nanoscale particles can form an interfacial layer between the water and the foaming agent, thereby increasing the resistance of the air-voids [38]. The distribution of the macropores is shown in Figure 6.…”

Section: Characterization Of Afcbmentioning

confidence: 99%

“…More stable incorporators of air have been sought that reduce the effects of Ostwald ripening, which reduces the coalescence and drainage of the film that encapsulates the air-void. In addition, the study by Krämer et al [38] demonstrated that adding silica nanoparticles forms emulsions that have a greater strength, thus allowing for a better distribution during mixing in the mortar, thereby improving the stability of the bubbles in the first hours of hydration of the binder. RP has been little explored in the international literature because it is a regional material.…”

Section: Introductionmentioning

confidence: 99%

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Production of Aerated Foamed Concrete with Industrial Waste from the Gems and Jewels Sector of Rio Grande do Sul-Brazil

et al. 2017

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Abstract:The use of solid waste for the development of new building materials has been an alternative to reduce environmental impacts through the preservation of natural resources. In this context, this paper evaluates the possibility of using agate gemstone waste, called rolled powder, which basically consists of silica (SiO 2 ), in the manufacture of aerated foamed concrete blocks completely replacing the natural sand. Preformed foam was used as the air entrained by mechanical stirring with a mixture of natural foaming agents derived from coconut. To produce test specimens, the water/cement ratio and foam concentrations were varied, with three and four levels, respectively. The specimens were left for 28 days at room temperature to be cured, and then underwent analysis to determine their compressive strength, density, and the distribution of air-voids. The experiments demonstrated that the best water/cement ratio was 1.28 for 18% (of total solid mass) addition of foam, which generated a sample with a density of 430 kg/m 3 , and a compressive strength of 1.07 MPa. The result for compressive strength is 11% smaller than the requirements of the Brazilian standard (NBR 13438) for autoclaved aerated concrete blocks, but the results are promising.

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Section: Characterization Of Afcbmentioning

confidence: 61%

Section: Characterization Of Afcbmentioning

confidence: 96%

Section: Characterization Of Afcbmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Production of Aerated Foamed Concrete with Industrial Waste from the Gems and Jewels Sector of Rio Grande do Sul-Brazil

et al. 2017

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“…With a smaller addition of foam, the bubbles of air incorporated gather by dehydration, creating larger bubbles. These density variations occur given an increase in water content (FA increase) that makes bubbles collapse by a reduction of the hydro-lipophilic film, which makes them less resistant to the strength of the medium [52,53]. It is also due to the union of air bubbles incorporated into the mortar by dehydration; that is, it is a consequence of having CDW granulometry variation.…”

Section: Dry (Dbd) and Wet (Wbd) Bulk Densitymentioning

confidence: 99%

Characterization and Use of Construction and Demolition Waste from South of Brazil in the Production of Foamed Concrete Blocks

et al. 2017

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Featured Application: The use of construction and demolition waste (CDW) in the development of building materials has been done constantly. The CDW from Passo Fundo region of Rio Grande do Sul/Brazil can be used in development of foamed concrete fully replacing the natural sand. Abstract:The main objective of this study was to evaluate the use of construction and demolition waste (CDW) from the Passo Fundo region of Rio Grande do Sul (RS), Brazil, in the development of aerated foamed concrete. This waste had not yet been characterized or even reused. CDW was processed (sieved only), characterized, and used as an aggregate, completely substituting natural sand. The influence of CDW granulometry and the amount of foam upon compressive strength, wet and dry bulk density, water absorption, and the air voids of concrete blocks were determined. Results showed that CDW has regular characteristics for the development of aerated foamed concrete. Compressive strength and density decreased as the amount of foam increased, while water absorption and air voids also increased. Also, CDW that was classified as coarse showed higher compressive strength. On average, CDW medium-sized particles had a higher air void content, while water absorption showed little variation with respect to granulometry. CDW residue from the region of study can be used as aggregate for the development of aerated foamed concrete. However, it must characterized before being used to guarantee the quality of the final product.

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