Experimental evaluation of geosynthetics as reinforcement for shotcrete

Moffat, Ricardo; Jadue, C.; Beltrán, Juan Felipe; Herrera, Ricardo

doi:10.1016/j.geotexmem.2017.01.007

Cited by 12 publications

(10 citation statements)

References 33 publications

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“…The relationship between bond strength and surface roughness (represented by JRC) is different for 7-day than 28-day sprayed mortar. Thus, the two linear Equations (7) and 8…”

Section: Influence Of Roughnessmentioning

confidence: 99%

“…Sprayed concrete or mortar, known also as shotcrete, is applied using compressed air or another power source to spray the cementitious material through a nozzle onto a surface where the material solidifies and strengthens. Shotcrete was developed in the early 1900s, although there is ongoing research with new findings about its components and application [5][6][7]. Sprayed concrete and sprayed mortar are similar.…”

Section: Introductionmentioning

confidence: 99%

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Bond Strength Tests under Pure Shear and Tension between Masonry and Sprayed Mortar

2020

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Sprayed mortar or shotcrete is a construction technology that could enhance existing masonry buildings’ resilience by reinforcing low-safety load-bearing walls. Many factors affect the resistance of shotcrete-reinforced structures. One of the most important is the bond strength at the interface between the shotcrete and the reinforced wall. According to previous technical literature, bond strength usually has two evaluation criteria: shear and tensile strength. The experimental campaign described in this article focused on the bond strength between sprayed mortar and three masonry materials without the influence of normal force or constraint, as well as the roughness of these materials. The analysis of these tests focused on determining the relation between bond strength, roughness, and material strength. The analyses revealed that material strength has a more significant effect on bond strength than roughness, and bond strength is related to shrinkage of the materials. On the basis of previous theories, these researchers found that when there is no obvious influence due to normal force and constraint, the shear strength and tensile strength are different, and the shear strength is likely to be the cohesion force of the two materials. Finally, this article concludes with a novel logarithmic relationship between these strengths.

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“…The relationship between bond strength and surface roughness (represented by JRC) is different for 7-day than 28-day sprayed mortar. Thus, the two linear Equations (7) and 8…”

Section: Influence Of Roughnessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bond Strength Tests under Pure Shear and Tension between Masonry and Sprayed Mortar

2020

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“…Geossintéticos podem ser vistos como bons elementos de reforço para o concreto projetado, tendo em vista que tais materiais não são corrosivos (diferente das soluções com tela de aço) e permitem contornar o problema de formação de aglomerados de fibras (que provocam redução da tenacidade do concreto) pois o uso do geossintético substituiria o da fibra (Moffat et al 2017).…”

Section: Geossintético Como Reforçounclassified

“…XX Congresso Brasileiro de Mecânica dos Solos e Engenharia Geotécnica IX Simpósio Brasileiro de Mecânica das Rochas IX Simpósio Brasileiro de Engenheiros Geotécnicos Jovens VI Conferência Sul Americana de Engenheiros Geotécnicos Jovens 15 a 18 de Setembro de 2020 -Campinas -SP Moffat et al (2017) realizaram ensaios de resistência à flexão para quantificar a influência do reforço com geossintéticos no comportamento do concreto projetado. Em seu trabalho eles ensaiaram o reforço com oito tipos de geogrelhas (uniaxial, biaxial e multiaxial) e três tipos de geotêxteis.…”

Section: Geossintético Como Reforçounclassified

Inovações técnicas do concreto projetado aplicado em obras subterrâneas

Soares¹,

Gomes²

2020

Congresso Brasileiro De Mecânica Dos Solos E Engenharia Geotécnica

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RESUMO: O concreto projetado é uma técnica centenária bastante difundida no segmento de obras subterrâneas, apesar disso tem sofrido mudanças devido ao surgimento de ideias inovadoras e aos avanços tecnológicos ocorridos nos últimos anos. Tendo em vista esse processo, este artigo tem como objetivo agrupar algumas das inovações que vem sendo apresentadas ultimamente. Assim foi apresentado um simulador 3D para treinamento de mangoteiros e também máquinas equipadas com scanner que otimizam a aplicação do concreto projetado, isso mostra que a tendência apresentada pelo setor é a automatização dos equipamentos, fato que vem sido promovido pelo Tunelamento 4.0. Novos compósitos cimentícios foram abordados como, por exemplo o concreto autocicatrizante que soluciona problemas de fissuramento. Foi tratado também sobre equipamentos que promovem soluções de logística, sobre a utilização de geossintéticos como reforço do revestimento e sobre a criação de um novo equipamento para controle tecnológico de concreto projetado aplicada em escavações sujeitas a grandes deslocamentos (Bulking). Através dessas inovações é possível perceber que mesmo após tantos anos de utilização do concreto projetado em escavações ainda há muito a cerca dessa técnica a ser descoberto, melhorado e implementado, tudo isso corrobora para a formação de uma engenharia de obras subterrâneas mais robusta. PALAVRAS-CHAVE: Inovações do Concreto Projetado, Obras subterrâneas, Tunelamento 4.0.ABSTRACT: Shotcrete is a centuries-old technique widely used in underground construction. Despite this, it has been changed due to the emergence of innovative ideas and technological advances that have occurred in the last years. Because of this process, this paper aims to group some of the innovations that have been presented lately. Thus, a 3D simulator for nozzleman training was shown, as well machines equipped with a scanner that optimize the application of shotcrete; this indicates that the sector trend is process automation, a fact that was promoted by Tunneling 4.0. New cementitious composites were aborted such as the self-healing concrete that solves cracking problems. It was also treated about equipment that solves logistics problems, about the use of geosynthetic as reinforcement and the creation of new machine for technological control of concrete applied in excavations subject to large displacements (Bulking). Through these innovations it is possible to see although the large number of years that shotcrete was used in excavations, there are many things about this technique to discover, improve and implement, all of this corroborates for the formation of a more robust underground works engineering.

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“…Additionally, in recent years the behavior of reinforced subgrades has been investigated by many researchers [7][8][9][10][11][12][13]. It is well known that the performance of the reinforced systems is enhanced mainly depending on the reinforcement properties such as position [14,15], strength [16], and mesh size [17,18] of the reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Effects of the first reinforcement depth for different types of geosynthetics

2017

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In this study, the performance of the first reinforcement layer depth for sand subbase of a road or construction was investigated with plate load laboratory tests. Unreinforced and reinforced experiments for different reinforcement types were made by changing the first reinforcement layer depth ratio. One type of geotextile and two different geogrid specimens were used in the research. Load-settlement curves and Bearing Ratios were studied by measuring the results for different settlement ratios. Finally, laboratory measurements of unreinforced and reinforced soil using geotextile reinforcement were compared with Finite Element Model (FEM) analyses modeled under similar conditions. The results demonstrated the effects of different types of reinforcements for different first reinforcement layer locations. The number of reinforcement layers was another parameter which affected the bearing ratio along with the first reinforcement layer depths. It was also observed that the Bearing Ratio (BR) and load-settlement behavior changed significantly with the first reinforcement depth and settlements. Effects on failure modes for unreinforced and reinforced sand soils were compared for each test.

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Experimental evaluation of geosynthetics as reinforcement for shotcrete

Cited by 12 publications

References 33 publications

Bond Strength Tests under Pure Shear and Tension between Masonry and Sprayed Mortar

Bond Strength Tests under Pure Shear and Tension between Masonry and Sprayed Mortar

Inovações técnicas do concreto projetado aplicado em obras subterrâneas

Effects of the first reinforcement depth for different types of geosynthetics

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