Porous Structure by X-Ray Computed Tomography and Sound Absorption in Pervious Concretes with Air Cooled Blast Furnace Slag as Coarse Aggregate

Ríos, José D.; Arenas, Celia; Cifuentes, Héctor; Peceño, Begoña; Leiva, Carlos

doi:10.1007/s40857-019-00162-5

Cited by 14 publications

(19 citation statements)

References 20 publications

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“…The absorption coefficient was low for frequency bands below 200 Hz and reached 0.7 at 4000 Hz. This trend is comparable to the results shown by other researchers in noise reducing devices made from other wastes and with similar physical properties (24,37).…”

Section: Acoustic Propertiessupporting

confidence: 92%

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Experimental study of a noise reducing barrier made of fly ash

et al. 2021

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Although fly ash is commonly used as an additive to cement, large amounts of this material are disposed in landfills. To mitigate, it would be interesting to develop new products in which fly ash can be easily used and required in large quantities. In this work, fly ash is added to manufacture eco-friendly materials with acceptable acoustic and non-acoustic properties and a low cost. We built a barrier composed of fly ash (60 wt.%), type II Portland cement (25 wt.%), vermiculite (14.5 wt.%) and polypropylene fibers (0.5 wt.%). The barrier complied with the mechanical requirements of European standards. The sound absorption coefficient and the airborne sound insulation were determined in a reverberation room, and the barrier was classified as A2 and B3. No leaching problems were observed.

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Section: Acoustic Propertiessupporting

confidence: 92%

“…As observed in Figure 2, the porosity of the FA barrier presented a flaky structure due to the effect of the vermiculite and its pore size between 1 and 3 mm, while porous concretes show values between 3 and 10 mm of pore size according to a previous study that used X-ray computed tomography (37).…”

Section: Physical Propertiessupporting

confidence: 59%

Experimental study of a noise reducing barrier made of fly ash

et al. 2021

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“…Electrical tortuosity is defined as the ratio of the square of the effective path length to the shortest length. 34 It characterises the sinuous aspect of the fluid flow associated with the passage of a wave in a porous medium. Tortuosity is always greater than 1.…”

Section: Characteristics Of Pore Propertiesmentioning

confidence: 99%

Morphological analysis of porosity and sound absorption in sustainable materials from rice husk

et al. 2022

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This study proposes a composite material that incorporates rice husk. This research focuses on an experimental analysis of the physical, mechanical and acoustic performance of composite materials made of rice-husk waste. Various ratios of rice husk/resins have been employed. Complementary, X-ray computed tomography technique has been used to characterise a representative and extensive volume of material at the pore level, ranging from pore sizes of 100 μm to several millimetres Furthermore, detailed information of key factors of pore properties inside the matrix (pore size, sphericity, position, tortuosity and permeability) has been provided. All the compositions present high sound-absorption coefficients, with noise-reduction coefficients ranging from 0.39 to 0.52, and suitable compressive strength (>1 MPa). From the results, when the rice husk/resin ratio was decreased, the pore size fell between 1 and 4 mm, and the permeability reduced; in contrast, the compressive strength increased, although the sound absorption capacity diminished.

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“…The main factors affecting sound absorption include: porosity; aggregate grain size; type of aggregate; sample and additive thickness. The material used as a structural element, such as aerated concrete, can also act as an acoustic pollution absorber, thanks to its properties [30][31][32]. It was found that aerated concrete with 4-8 mm aggregates was the most suitable for sound absorption [33].…”

Section: Introductionmentioning

confidence: 99%

Sound-Absorbing and Thermal-Insulating Properties of Cement Composite Based on Recycled Rubber from Waste Tires

et al. 2021

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This article describes an experimental study aimed at investigating the potential use of recycled rubber granulate from waste tires of fractions 0/1 and 1/3 mm in cement composites as a 100% replacement for natural aggregates. The use of waste in the development and production of new building materials represents an important aspect for the sustainability and protection of the environment. This article is focused on the sound-absorbing and thermal-insulating properties of experimental cement composites based on recycled rubber from waste tires. The article describes the grain characteristics of recycled rubber, sound absorption capacity, thermal conductivity and strength characteristics. The results of this research show that the total replacement of natural aggregate with recycled rubber in cement composites is possible. Replacing natural aggregate with recycled rubber has significantly improved the thermal and acoustic properties of the prepared cement composites, however, at the same time; there was also the expected decrease in the strength characteristics due to the elasticity of rubber.

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Porous Structure by X-Ray Computed Tomography and Sound Absorption in Pervious Concretes with Air Cooled Blast Furnace Slag as Coarse Aggregate

Cited by 14 publications

References 20 publications

Experimental study of a noise reducing barrier made of fly ash

Experimental study of a noise reducing barrier made of fly ash

Morphological analysis of porosity and sound absorption in sustainable materials from rice husk

Sound-Absorbing and Thermal-Insulating Properties of Cement Composite Based on Recycled Rubber from Waste Tires

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