Experimental Study on Guabirotuba’s Soil Stabilization Using Extreme Molding Conditions

Baldovino, Jair de Jesús Arrieta; Izzo, Ronaldo Luis dos Santos; Feltrim, Fernanda; Silva, Érico Rafael da

doi:10.1007/s10706-019-01171-x

Cited by 14 publications

(5 citation statements)

References 37 publications

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“…Moreira et al (2019) calculated x=0.28 and y=4.47 for silt-cementground tile residue mixtures. Baldovino et al [44] calculated x=0.45 and y=2.00 for mixtures of GF yellow silt and CPV cement and suggested that x values less than one are more common for fine soils stabilized with cement, and x values close to 1 are more common, more common in sand-cement. Diambra et al [45] verified that the x and y parameters are linked to soil characteristics, and the y parameter can be approximated to the inverse of x.…”

Section: Effects Of Porosity/cement Index On the Split Tensile And Un...mentioning

confidence: 99%

Applying the Porosity-to-Cement Index for Estimating the Mechanical Strength, Durability, and Microstructure of Artificially Cemented Soil

2023

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Fine, expansive, and problematic soils cannot be used in fills or paving layers. Through additions to these soils, they can be converted into technically usable materials in civil construction. One methodology to make them viable for construction is through a stabilization process. Nevertheless, current methodologies regarding dosage based on compaction effort and the volumetric amount of binder used are unclear. Thus, this research describes cement-stabilized sedimentary silt's strength and durability properties from Curitiba (Brazil) for future application in paving. Splitting tensile strength, unconfined compressive strength, and loss of mass against wetting and drying cycles (W-D) were investigated in the laboratory utilizing greenish-gray silt (originating from one of the Guabirotuba Formation layers, Paraná) and high-early strength Portland cement- ARI (CPV). Utilized were cement concentrations (C) of 3, 5, 7, and 9%, molding dry unit weights (d) of 14, 15, and 16 kN/m3, curing periods (t) of 7, 14, and 28 days, and constant moisture content (w) of 23%. With an increase in cement concentration and curing time, the compacted mixes demonstrate an increase in strength, an improvement in microstructure, and a decrease in accumulated mass loss (ALM) and initial porosity (η). Using the porosity/volumetric cement content ratio (η/Civ), the lowest amount of cement required to stabilize the soil in terms of strength and durability was determined. The porosity/cement index provided an appropriate parameter for modeling the mechanical and durability properties, and a unique equation between the strength/accumulated loss of mass and the porosity/binder index was obtained for the curing times studied. Lastly, C = 5% by weight is the minimum acceptable amount for prospective subbase soil application. Doi: 10.28991/CEJ-2023-09-05-02 Full Text: PDF

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Section: Effects Of Porosity/cement Index On the Split Tensile And Un...mentioning

confidence: 99%

Applying the Porosity-to-Cement Index for Estimating the Mechanical Strength, Durability, and Microstructure of Artificially Cemented Soil

2023

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“…According to Diambra et al [33], for artificially cemented sandy soils, the existence of a tension/compression ratio (qt/qu) is independent of the curing time and is primarily governed by the tensile strength ratio (or frictional properties) of the cement. Baldovino et al found that the qt/qu value ranged from 0.15 to 0.17 for silts from the Guabirotuba Formation stabilized with high early-strength Portland cement [34] and that the qt/qu value depends on the moisture content during molding or compaction and varies between 0.136 and 0.159 for silty-sandy soil from the same formation improved with cement [35]. These findings indicate that the tension/compression relationship of the soil-cement-RAP mixtures falls within the range of values reported in the literature.…”

Section: Empirical Relationships Between Unconfined Compressive Stren...mentioning

confidence: 99%

Sustainable Use of Recycled Asphalt Pavement in Soil Stabilization

Lima,

Arrieta-Baldovino,

Izzo

2023

Civ Eng J

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This study addresses unused recycled asphalt pavement (RAP) incorporated into sedimentary soil from the Guabirotuba Formation in Curitiba, Southern Brazil. Different percentages of RAP, ranging from 0% to 80% by weight, were mixed with the pure soil, with and without the addition of pozzolanic Portland cement. Tests were conducted to evaluate the mixtures' compaction properties, mechanical strength, and expansion after curing for up to 28 days. The results showed that adding RAP improved the mixtures' unconfined compressive strength (qu) and splitting tensile strength (qt). Up to 60% RAP, the qu increased by 260 kPa, and the qt increased by 340 kPa compared to the pure soil. The California Bearing Ratio (CBR) tests demonstrated an 18.62% improvement when 80% RAP was added to the untreated soil. In addition, the RAP also reduced the expansion of the compacted blends, with values decreasing from 1.19% to 0.88% with 80% RAP replacement. The expansion value was further reduced to 0.86% when the cement was added. The cement-soil-RAP compacted blends showed suitability for subgrade reinforcement, meeting the criteria of expansion <1% and CBR> 2%. Additionally, 3% cement and 40% RAP mixtures were suitable as a sub-base layer, with expansion <1% and CBR > 20%. The results provide valuable insights into utilizing RAP as an alternative material in soil improvement techniques employing the novelty porosity-to-cement index. Doi: 10.28991/CEJ-2023-09-09-016 Full Text: PDF

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“…A adição de fibras ao solo estabilizado aumentou ligeiramente o valor de de cerca de 0,11 para 0,13, aumentando o teor de fibra de 0,1 para 1,2%. Finalmente, BALDOVINO et al [42]- [43] calcularam valores de =0,14-0,17 para misturas solo da FG-cimento. Assim, nota-se que a relação de resistência para solos cimentados/reforçados varia em média entre 10 e 20%.…”

Section: Relações Empíricas Entre a Compressão Simples E à Traçãounclassified

Variáveis que influenciam na resistência à tração e à compressão simples de dois solos sedimentares estabilizados com cimento

et al. 2020

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RESUMO O presente artigo avalia o desenvolvimento da resistência à tração por compressão diametral ou tração indireta (qt) e da compressão simples (qu) de dois solos cimentados artificialmente sob cura de 28 dias. Para isso, dois solos siltosos (amarelo e rosa) característicos da Formação Guabirotuba de Curitiba/BR foram estabilizados com cimento de alta resistência inicial (ARI) com porcentagens de 3, 5, 7 e 9% em referência à massa seca dos solos. Corpos de prova de 50 mm de diâmetro e 100 mm de altura (de volume=196,35 cm3) foram moldados com diferentes teores de cimento (C), diferentes pesos específicos secos aparentes (γd) e com uma umidade de moldagem (ω) constante em 23% e depois submetidos à ensaios de compressão simples e de tração indireta. Foi usada a relação vazios/cimento representado pela relação porosidade/teor volumétrico de cimento (η/Civ) para avaliar o desenvolvimento de qu e qt além de variáveis como C, porosidade (η) e γd. Os resultados demonstram um crescimento da resistência com o aumento do teor de cimento e com a diminuição dos vazios (isto é, maior peso específico seco e menor η). Uma equação de dosagem para qu e qt dos solos estudados e misturados com cimento foi desenvolvida com o uso da relação η/Civ ajustada a um expoente 0,44 para fazer compatível a variação entre η/Civ-qu qt. As equações de dosagem obtiveram coeficientes de determinação acima de 94%. Finalmente, se encontrou uma relação empírica de tração/compressão constante de 0,16 e de 0,14 para o solo amarelo e rosa, respectivamente.

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Experimental Study on Guabirotuba’s Soil Stabilization Using Extreme Molding Conditions

Cited by 14 publications

References 37 publications

Applying the Porosity-to-Cement Index for Estimating the Mechanical Strength, Durability, and Microstructure of Artificially Cemented Soil

Applying the Porosity-to-Cement Index for Estimating the Mechanical Strength, Durability, and Microstructure of Artificially Cemented Soil

Sustainable Use of Recycled Asphalt Pavement in Soil Stabilization

Variáveis que influenciam na resistência à tração e à compressão simples de dois solos sedimentares estabilizados com cimento

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