Comparison between the falling head and the constant head permeability tests to assess the permeability coefficient of sustainable Pervious Concretes

Sandoval, Gersson F.B.; Galobardes, Isaac; Teixeira, Raquel Souza; Toralles, Berenice Martins

doi:10.1016/j.cscm.2017.09.001

Cited by 40 publications

(31 citation statements)

References 21 publications

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“…Finally, water was added to fill the internal voids of the material and when the water touched the surface of the specimen, its mass was determined. The porosity was calculated using Equation 1 [4,13,24].…”

Section: Porositymentioning

confidence: 99%

“…For this test, the specimens used in the compressive strength test were again used, also in the saturated surface dry condition. The specimens were wrapped in PVC film, followed by a coating with conventional adhesive tape and, finally, a layer of polyethylene adhesive tape with cotton cloth (Silver Tape), in order to guarantee impermeability [4].…”

Section: Permeabilitymentioning

confidence: 99%

“…Among these materials is the pervious concrete (PC) which, because of its composition, has a high porosity due to the partial or total lack of small aggregates in the mixture. This concrete has a drainage capacity greater than the conventional one, which reduces the flow of rainwater present in the surface runoff [4]. PC is composed of Portland cement, coarse aggregate and water, with little or no small aggregate (sand), which facilitates the formation of interconnected internal voids that allow the fast and safe flow of water [1,2,5,6].…”

Section: Introductionmentioning

confidence: 99%

“…In terms of mechanical strength, this material works in the range of 3-30 MPa [7][8][9][10], and can be used on pedestrian sidewalks and light traffic pavements. In hydraulic terms, the permeability coefficient of the material varies from 1 to 20mm/s, which guarantees the rapid flow of water through its structure [4,[11][12][13][14]. Currently, construction waste has been used as an aggregate in the manufacture of PC.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical properties obtained with some of these aggregates vary from 6 to 14 MPa in the compressive strength and from 1 to 2 in the flexural strength [15,16], with a reduction in these properties when compared to the use of conventional aggregates [1]. However, the hydraulic properties comply with the requirements of national and international regulations, above 1 mm/s [17]. In order to improve the mechanical properties of the pervious concrete made from waste, the steel slag (FEA), which is generated in the production of second-line steel, has been used, and has physical characteristics similar to conventional aggregates [18].…”

Section: Introductionmentioning

confidence: 99%

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Pervious concrete made with electric furnace slag (FEA): mechanical and hydraulic properties

Sandoval

Galobardes

Dias

et al. 2019

Rev. IBRACON Estrut. Mater.

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ResumoThe objective of this work is to make feasible the use of FEA slag instead of the conventional bulk aggregate in the pervious concrete (PC) production, reaching the minimum parameters required by NBR16416/2015 and ACI 522R-10. This substitution would minimize the use of natural aggregates, besides taking advantage of a residue that has no specifi c destination. In order to reach the objective, three FEAs with diff erent grain sizes were chosen: 6-10 mm (A), 10-20 mm (B) and fi nally a mixture of the two previous ones (C) in the proportion 30-70 respectively. In order to evaluate its mechanical behavior, tests of compressive strength and fl exural tensile tests were carried out, while the evaluation of the hydraulic behavior, porosity and constant head permeability test were performed. The compressive strength varies from 19-31MPa and 3-4MPa for fl exural tensile strength was obtained. In hydraulic terms, the porosity varied from 15-20% and the permeability coeffi cient was 10-12mm/s. There is also a direct infl uence of grains of size less than 4.8 mm (small aggregate) on the compressive strength and permeability of PCs. At the end of the results, it was possible to establish a correlation between the compressive strength, the permeability and the percentage of grains inferior to 4.8mm (sand%), being this positive in relation to the studied variables, that is, the mechanical and hydraulics. Therefore, it has been concluded that the total substitution of conventional aggregates by FEA in CoPe manufacturing will comply with the minimum parameters of NBR 16416/2015.O objetivo deste trabalho é viabilizar o uso de escória de forno elétrico (FEA) em substituição ao agregado graúdo convencional na fabricação de concreto permeável (CoPe), atingindo os parâmetros mínimos exigidos pela norma NBR16416/2015. Esta substituição minimizaria a utilização de agregados naturais, além de aproveitar um resíduo que não tem destinação específi ca. Para alcançar o objetivo foram escolhidos três FEA's com diferentes distribuições granulométricas: 6-10 mm (A), 10-20 mm (B) e fi nalmente uma mistura das duas anteriores (C) na proporção 30-70 respectivamente. Para avaliar seu comportamento mecânico foram realizados ensaios de resistência à compressão e tração na fl exão, enquanto na avaliação do comportamento hidráulico, índice de vazios e permeabilidade à carga constante foram realizados. Na compressão foram obtidas resistências variando de 19-31MPa e 3-4MPa na tração na fl exão. Em termos hidráulicos, o índice de vazios variou de 15%-20% e o coefi ciente de permeabilidade de 10-12mm/s. Também se verifi ca a infl uência direta dos grãos de tamanho inferior a 4.8 mm (agregado miúdo) na resistência à compressão e na permeabilidade dos CoPes. Ao fi nal, a partir dos resultados obtidos foi possível estabelecer uma correlação entre a resistência à compressão, a permeabilidade e a porcentagem de grãos inferiores a 4.8mm (%areia), sendo esta positiva em relação às variáveis estudadas, ou seja, as propriedades mecânicas e hidráulica. Por ta...

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Section: Porositymentioning

confidence: 99%

Section: Permeabilitymentioning

confidence: 99%