Characterization of phyllite weathering profiles developed under tropical climate on Quadrilátero Ferrífero region, MG, Brazil

Carvalho, Tatiane Robaina Rangel de; Leão, Marcio Fernandes; Marques, Eduardo Antônio Gomes

doi:10.1016/j.jsames.2020.102727

Cited by 3 publications

(1 citation statement)

References 37 publications

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“…Sua função na argamassa é semelhante à da cal, prover trabalhabilidade e plasticidade [9]. No país há disponibilidade para exploração deste mineral no estado do Paraná [8], São Paulo [10] e Minas Gerais [11][12][13].A maior produtora do país está instalada no Estado de São Paulo e produz cerca de 300.000 t por ano [14]. A viabilidade técnica (físico-química) da substituição de cal por filito (Phyllite)é comprovada no estado fresco pelo ensaio de fluxo, com pouca diferença para aplicação da argamassa em comparação à cal [9].…”

Section: Introductionunclassified

Filito como substituto da cal dolomítica hidratada em argamassas de revestimento

Pedry¹,

Simoneto²,

Oliveira³

et al. 2022

Xix Encontro Nacional De Tecnologia Do Ambiente Construído

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O objetivo deste trabalho é avaliar o uso de filito como substituto da cal dolomítica hidratada na produção de argamassas de revestimento, avaliando as propriedades físicas (absorção de água), mecânicas (resistência à compressão, tração e aderência) e emissões de CO2. Foram avaliadas 12 argamassas mistas com cal, cal e filito e apenas com filito em substituição à cal, nas proporções 1:1:6 e 1:2:9 (cimento:cal e/ou filito:areia). Os resultados indicam que com a substituição de cal por filito ocorre um aprimoramento em algumas propriedades físicas e mecânicas e a redução das emissões associadas à produção das argamassas.

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Section: Introductionunclassified

Filito como substituto da cal dolomítica hidratada em argamassas de revestimento

Pedry¹,

Simoneto²,

Oliveira³

et al. 2022

Xix Encontro Nacional De Tecnologia Do Ambiente Construído

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Damage evolution of phyllite based on uniaxial compression and acoustic emission tests

et al. 2021

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Geochemical and mineralogical analysis of low-grade metamorphic rocks and their response to shallow landslide occurrence in Central Nepal

Silwal,

Gyawali,

Yoshida

2024

Geoenviron Disasters

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Background The weathering intensity and geochemical properties of a rock contribute to shallow landslide occurrences. This study aims to establish the role of rock weathering in shallow slope instability in low-grade metamorphic rocks of the Lesser Himalaya region of central Nepal. The rocks of the Kuncha Formation, which consist of phyllites, metasandstones, and gritty phyllites are characterized by the formation of shallow landslides. Field characterization of the rock mass within the landslide body, along with petrographic observations, clay mineral analysis, and major bulk geochemistry were adopted to establish a relationship between rock weathering and landslide occurrence. Results The landslides distributed within the Kuncha Formation in the study area are debris-related slides and falls, rock falls, and complex slides. Microscopic petrographic observation of rock from the landslide area revealed well-developed microcracks and intergranular microfractures within the weathered samples, which suggests extensive disintegration and physical alteration. Kinematic analysis of the landslide slope revealed that discontinuities and bedding planes also affected the failure of the slope. The occurrence of neo-formed clay minerals and the conversion of biotite-muscovite to vermiculite, kaolinite, and mixed-layer clays indicate chemical weathering. The CIA ranges between 71 and 80 for the rock samples and between 72 and 84 for the soil samples, signifying moderate to extreme weathering effects. The higher values of PIA and CIW reveal K-feldspar and plagioclase alteration to clay minerals by weathering and alteration. CIA-LOI plots reveal significant relationships corresponding to weathering effects. Conclusion The transition of rock from a fresh to a moderately weathered state and the development of clay minerals and major discontinuities played a crucial role in shallow landslide occurrence. The weakened physical properties of the rock mass due to weathering coupled with unfavorable joints and fracture conditions have led to instability of the hillslopes in the study area. It was observed that one of the driving factors that drives slopes to erosion and landslides is weathering. The dominant occurrence of landslides in the weathered rock domain within the study area validates the occurrence of landslides and weathering interconnections.

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Characterization of phyllite weathering profiles developed under tropical climate on Quadrilátero Ferrífero region, MG, Brazil

Cited by 3 publications

References 37 publications

Filito como substituto da cal dolomítica hidratada em argamassas de revestimento

Filito como substituto da cal dolomítica hidratada em argamassas de revestimento

Damage evolution of phyllite based on uniaxial compression and acoustic emission tests

Geochemical and mineralogical analysis of low-grade metamorphic rocks and their response to shallow landslide occurrence in Central Nepal

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