Influence of Fiber and Cement Addition on Behavior of Sandy Soil

Consoli, Nilo César; Prietto, Pedro Domingos Marques; Ulbrich, Luciane A.

doi:10.1061/(asce)1090-0241(1998)124:12(1211)

Cited by 315 publications

(108 citation statements)

References 11 publications

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“…In laboratory tests Consoli et al (1998) and Cai et al (2006) showed that the addition of fibres to soils alters the failure mechanism; the peak and postpeak (residual) strengths increased, and soils tended towards ductile failure as the fibres prevented the development of tension cracks. Previous studies on fibre-reinforced fine-grained soils have typically involved drying the soil to a powder prior to mixing.…”

Section: Introductionmentioning

confidence: 99%

Mixing and compaction of fibre- and lime-modified cohesive soil

Gelder

Fowmes

2016

Proceedings of the Institution of Civil Engineers - Ground Impr

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Citation: GELDER, C. and FOWMES, G.J., 2015. Mixing and compaction of fibre-and lime-modified cohesive soil.Proceedings of the ICE -Ground Improvement, 169 (2), pp. 98-108.Additional Information:• Fibre reinforcement is a versatile method of increasing the shear strength of soils for earthwork applications. However, research to date has encountered a number of problems when utilising cohesive host soils. The aim of this study was to develop a suitable site-applicable method of mixing fibre into cohesive host soils. Intermediate plasticity clay reinforced with monofilament polypropylene fibres was used in the laboratory investigations. In order to mix the fibres successfully, the initial moisture content of the host soil was increased prior to the introduction of fibres. By introducing quicklime, excess moisture was removed through the hydration process, and a portion of free water was effectively held within aggregations of flocculated clay particles, thereby having little influence on the dynamic boundaries. Fibrous inclusions within the clay clods resisted compactive effort, forming an interlocked structure. As a result, the optimum moisture content increased and the maximum dry density decreased. This trend was heavily dependent on the interfacial shear resistance along the fibre boundary, which consequently decreased as the water content increased or the compactive effort was increased. Results from strength tests confirmed that both peak and post-peak shear strength increased, creating a more ductile material capable of maintaining shear strength at high levels of strain.

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Section: Introductionmentioning

confidence: 99%

Mixing and compaction of fibre- and lime-modified cohesive soil

Gelder

Fowmes

2016

Proceedings of the Institution of Civil Engineers - Ground Impr

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“…They concluded that addition of fiber leads to an increase in peak strength and a decrease in postpeak reduction in shear resistance. Adding discrete fibers to cemented soil and performing triaxial compression tests on the mixture, Consoli et al [6] found out that fiber reinforcement increases both peak and residual strength, and changes the brittle behavior of cemented soil to a more ductile one. After performing undrained triaxial tests on soil reinforced with natural sisal fibers, Parabakar & Sridhar [9] concluded that fiber reinforcement enhances the shear strength of the mixture.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Mechanical Properties ofFiber-Reinforced Sand under Triaxial Compressionand Direct Shear

Noorzad

Zarinkolaei

2015

Open Geosciences

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This research investigates the behavior of sand reinforced with polypropylene fiber. To do this, 40 direct shear tests and 40 triaxial tests were performed on the coastal beaches of Babolsar, a city in the North of Iran. The effect of parameters such as fiber content, length of fiber and normal or confining pressure on the behavior of Babolsar sand have been studied. In this study, four various fiber contents (0, 0.25, 0.5 and 1 percent), three different lengths of fiber (6, 12 and 18 mm) and four normal or confining pressures (50, 100, 200 and 400 kPa) have been employed. The test results show that fiber inclusion has a significant effect on the behavior of sand. In both direct shear and triaxial tests, the addition of fibers improved shear strength parameters (C, φ), increased peak shear strength and axial strain at failure, and also limited the amount of post-peak reduction in shear resistance. The comparison of the test results revealed that due to better fiber orientation toward the direction of principal tensile strain in triaxial test as compared to direct shear tests, the fiber efficiency and its effect on soil behavior is much more significant in triaxial specimens.

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“…To better understand the toughening characteristics of the untreated and the treated sisal fibers in the post peak region, the tensile load (P) on the load axis and the deformation (d) on deformation axis were normalized with the peak tensile load (P p ) and the deformation at peak load (d p ) as shown in To verify this, a dimensionless parameter called brittleness index (ratio of peak strength to ultimate strength, I b ) [30] and deformability index (ratio of diametral strain at failure of the mix B08L080PG10SFT1 or B08L080PG10SFT2 or B08L080PG10SFT3 to the diametral strain at failure of the mix B08L080PG10SF, I d ) [31] were calculated using Eqs. (1) and (2) and the results are shown in Figures 3 and 4 respectively.…”

Section: Toughness Characteristicsmentioning

confidence: 99%