Difficulties Regarding Determination of Plasticity Index of Silty Soils by use of Casagrande and Fall Cone Methods

Rikke Poulsen, Lars Bo Ibsen, Benjaminn Nordahl Nielsen

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

Resumé

Soil plasticity index and thereby the liquid limit and plastic limit are often used in order to classify the soil type and determine soil properties. Generally, two methods, i.e. the Casagrande cup method and the fall cone method are adopted in order to determine the liquid limit of soil. In many countries, the fall cone is the preferred method to determine the liquid limit due to simplicity and comparative reproducibility. However, some researchers state that the liquid limit obtained by using the fall cone method cannot represent the soil plasticity particularly in soil with either very low or high plasticity. In addition, critics of the fall cone method indicate that the liquid limit can be determined by the fall cone even though it is not possible with the Casagrande cup which is why the soil should be noted as non-plastic. This paper presents how the Casagrande cup method is inapplicable for low plasticity silt due to e.g. problems with cutting the groove. The fall cone method is recommended because the results are more accurate and independent of individual execution. However, the fall cone apparatus also has an applicability limit where it is not possible to determine the liquid limit which is why the silt should be noted as non-plastic. This limit occurs when a clear water level is observed due to quick draining.
OriginalsprogEngelsk
TitelNGM 2012 Proceedings : Proceedings of the 16th Nordic Geotechnical Meeting
Antal sider8
Vol/bind1
ForlagDansk Geoteknisk Forening
Publikationsdato2012
Sider199-206
ISBN (Trykt)978-87-89833-27-9
StatusUdgivet - 2012
BegivenhedThe Nordic Geotechnical Meeting - Copenhagen, Danmark
Varighed: 9 maj 201212 maj 2012
Konferencens nummer: 16

Konference

KonferenceThe Nordic Geotechnical Meeting
Nummer16
LandDanmark
ByCopenhagen
Periode09/05/201212/05/2012

Fingerprint

Plasticity
Cones
Soils
Liquids
Silt
Water levels
Plastics

Bibliografisk note

Proceedings published in 2 volumes

Emneord

  • Silts
  • Soil Classification
  • Laboratory Tests
  • Plasticity
  • Laboratory Equipment

Citer dette

Poulsen, R., Ibsen, L. B., & Nielsen, B. N. (2012). Difficulties Regarding Determination of Plasticity Index of Silty Soils by use of Casagrande and Fall Cone Methods. I NGM 2012 Proceedings: Proceedings of the 16th Nordic Geotechnical Meeting (Bind 1, s. 199-206). Dansk Geoteknisk Forening.
Poulsen, Rikke ; Ibsen, Lars Bo ; Nielsen, Benjaminn Nordahl. / Difficulties Regarding Determination of Plasticity Index of Silty Soils by use of Casagrande and Fall Cone Methods. NGM 2012 Proceedings: Proceedings of the 16th Nordic Geotechnical Meeting. Bind 1 Dansk Geoteknisk Forening, 2012. s. 199-206
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abstract = "Soil plasticity index and thereby the liquid limit and plastic limit are often used in order to classify the soil type and determine soil properties. Generally, two methods, i.e. the Casagrande cup method and the fall cone method are adopted in order to determine the liquid limit of soil. In many countries, the fall cone is the preferred method to determine the liquid limit due to simplicity and comparative reproducibility. However, some researchers state that the liquid limit obtained by using the fall cone method cannot represent the soil plasticity particularly in soil with either very low or high plasticity. In addition, critics of the fall cone method indicate that the liquid limit can be determined by the fall cone even though it is not possible with the Casagrande cup which is why the soil should be noted as non-plastic. This paper presents how the Casagrande cup method is inapplicable for low plasticity silt due to e.g. problems with cutting the groove. The fall cone method is recommended because the results are more accurate and independent of individual execution. However, the fall cone apparatus also has an applicability limit where it is not possible to determine the liquid limit which is why the silt should be noted as non-plastic. This limit occurs when a clear water level is observed due to quick draining.",
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Poulsen, R, Ibsen, LB & Nielsen, BN 2012, Difficulties Regarding Determination of Plasticity Index of Silty Soils by use of Casagrande and Fall Cone Methods. i NGM 2012 Proceedings: Proceedings of the 16th Nordic Geotechnical Meeting. bind 1, Dansk Geoteknisk Forening, s. 199-206, The Nordic Geotechnical Meeting , Copenhagen, Danmark, 09/05/2012.

Difficulties Regarding Determination of Plasticity Index of Silty Soils by use of Casagrande and Fall Cone Methods. / Poulsen, Rikke; Ibsen, Lars Bo; Nielsen, Benjaminn Nordahl.

NGM 2012 Proceedings: Proceedings of the 16th Nordic Geotechnical Meeting. Bind 1 Dansk Geoteknisk Forening, 2012. s. 199-206.

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

TY - GEN

T1 - Difficulties Regarding Determination of Plasticity Index of Silty Soils by use of Casagrande and Fall Cone Methods

AU - Poulsen, Rikke

AU - Ibsen, Lars Bo

AU - Nielsen, Benjaminn Nordahl

N1 - Proceedings published in 2 volumes

PY - 2012

Y1 - 2012

N2 - Soil plasticity index and thereby the liquid limit and plastic limit are often used in order to classify the soil type and determine soil properties. Generally, two methods, i.e. the Casagrande cup method and the fall cone method are adopted in order to determine the liquid limit of soil. In many countries, the fall cone is the preferred method to determine the liquid limit due to simplicity and comparative reproducibility. However, some researchers state that the liquid limit obtained by using the fall cone method cannot represent the soil plasticity particularly in soil with either very low or high plasticity. In addition, critics of the fall cone method indicate that the liquid limit can be determined by the fall cone even though it is not possible with the Casagrande cup which is why the soil should be noted as non-plastic. This paper presents how the Casagrande cup method is inapplicable for low plasticity silt due to e.g. problems with cutting the groove. The fall cone method is recommended because the results are more accurate and independent of individual execution. However, the fall cone apparatus also has an applicability limit where it is not possible to determine the liquid limit which is why the silt should be noted as non-plastic. This limit occurs when a clear water level is observed due to quick draining.

AB - Soil plasticity index and thereby the liquid limit and plastic limit are often used in order to classify the soil type and determine soil properties. Generally, two methods, i.e. the Casagrande cup method and the fall cone method are adopted in order to determine the liquid limit of soil. In many countries, the fall cone is the preferred method to determine the liquid limit due to simplicity and comparative reproducibility. However, some researchers state that the liquid limit obtained by using the fall cone method cannot represent the soil plasticity particularly in soil with either very low or high plasticity. In addition, critics of the fall cone method indicate that the liquid limit can be determined by the fall cone even though it is not possible with the Casagrande cup which is why the soil should be noted as non-plastic. This paper presents how the Casagrande cup method is inapplicable for low plasticity silt due to e.g. problems with cutting the groove. The fall cone method is recommended because the results are more accurate and independent of individual execution. However, the fall cone apparatus also has an applicability limit where it is not possible to determine the liquid limit which is why the silt should be noted as non-plastic. This limit occurs when a clear water level is observed due to quick draining.

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KW - Laboratory Tests

KW - Plasticity

KW - Laboratory Equipment

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KW - Soil Classification

KW - Laboratory Tests

KW - Plasticity

KW - Laboratory Equipment

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SN - 978-87-89833-27-9

VL - 1

SP - 199

EP - 206

BT - NGM 2012 Proceedings

PB - Dansk Geoteknisk Forening

ER -

Poulsen R, Ibsen LB, Nielsen BN. Difficulties Regarding Determination of Plasticity Index of Silty Soils by use of Casagrande and Fall Cone Methods. I NGM 2012 Proceedings: Proceedings of the 16th Nordic Geotechnical Meeting. Bind 1. Dansk Geoteknisk Forening. 2012. s. 199-206