3-dimension stresses and new failure model to predict behavior of clay soils in various liquid limit ranges

2021 ◽  
Vol 14 (3) ◽  
Author(s):  
Cumaraswamy Vipulanandan ◽  
Ahmed Salih Mohammed
Keyword(s):  
Liquid Limit ◽  
Clay Soils ◽  
Failure Model

scholarly journals Effects of High Plasticity and Expansive Clay Stabilization with Lime on UCS Testing in Several Conditions

2021 ◽  
Vol 1000 (1000) ◽  
Author(s):  
Soewignjo Agus Nugroho ◽  
Gunawan Wibisono ◽  
Andarsin Ongko ◽  
Avrilly Zesthree Mauliza
Keyword(s):  
Soil Stabilization ◽  
Soft Soil ◽  
Fine Powder ◽  
High Water ◽  
Liquid Limit ◽  
Clay Soils ◽  
High Water Content ◽  
High Plasticity ◽  
Expansive Clay ◽  
Limit Value

Clay is a cohesive and very soft soil if it has high water content. To overcome this problem, clay soils with high plasticity need to be stabilized. The method of soil stabilization with lime is an alternative effort to improve soil that does not meet the standards. Lime reacts with groundwater so that it changes the property of the soil, reducing the stickiness and softness of the soil. Lime also functions to solidify (stabilize) and stabilize (stabilize) soil in the form of fine powder consisting of metals and inorganic mineral composition. This study aims to determine the effect of clay soils when carried out stabilization by using a limestone additive which varies in levels of mixture. The results showed that lime effective for the stabilization high plasticity and expansive clay by increasing the compressive strength value of UCS with lime content of 10% under curing conditions in 28 days and unsoaked by 319%, the liquid limit value reduced by 6% and the plastic limit value increased by 46%.

USE OF THE LIQUID LIMIT IN CHARACTERIZING CLAY SOILS

1972 ◽  
Vol 52 (3) ◽  
pp. 457-464 ◽  
Author(s):  
B. P. WARKENTIN
Keyword(s):  
Grain Size ◽  
Surface Area ◽  
Clay Minerals ◽  
Amorphous Material ◽  
Clay Content ◽  
Liquid Limit ◽  
Coarse Grained ◽  
Clay Soils

An index property for clay soils is sought to give the information that grain size gives about coarse-grained soils. The liquid limit is suggested as such an index property. The liquid limit is closely related to surface area for clay soils containing tabular clay minerals. This relation exists also for soils containing allophane or amorphous material. In addition to estimating surface area, liquid limit also gives information about the nature of the surface. In this respect it is a more useful measurement than clay content.

scholarly journals Stabilization of soft clayey soils with sawdust ashes

2018 ◽  
Vol 162 ◽  
pp. 01006
Author(s):  
Hussein Karim ◽  
Makki Al-Recaby ◽  
Maha Nsaif
Keyword(s):  
Clayey Soil ◽  
Soft Clay ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Dry Weight ◽  
Liquid Limit ◽  
Clay Soils ◽  
Dry Density ◽  
Clayey Soils ◽  
Maximum Dry Density

The problems of soft clayey soils are taken in considerations by many Iraqi geologists and civil engineers, because about 35% of the Iraqi clay soils (especially southern Iraq) are weak. Thus, it is necessary to improve the properties of such soils for road construction by means of using of various stabilizers such as sawdust ash. The main goal of the present study is to stabilize soft clay models with sawdust ash (SDA) additive using different percentages (0, 2, 4, 6, 8 and 10% by dry weight of soil). The results revealed that the additive has adverse effects on the property of soil indices by increasing its liquid limit and plasticity index due to clay content. The mixture of sawdust ashes with soft clay soils improves most other physical and mechanical properties of the soil, as expressed by a general reduction in specific gravity and maximum dry density (MDD), as well as a reduction in the compression coefficients (Cc and Cr) with an increase in SDA content. While increasing the optimum moisture content (OMC) and the undrained shear strength (cu) with the increase in SDA content. The stabilized soils (with 4 and 10% ash content) resulted in low CBR values (1.6-1.2%) which can be used as sub-base. The SDA can be considered as a cheap and acceptable stabilizing agent in road construction for improving most of the geotechnical properties of the soft clayey soil.

An Appraisal of Soil Index Tests

1986 ◽  
Vol 2 (1) ◽  
pp. 317-323 ◽  
Author(s):  
F. Medhat ◽  
I. L. Whyte
Keyword(s):  
Shear Strength ◽  
Liquid Limit ◽  
Clay Soils ◽  
Alternative Procedure ◽  
Rational Basis ◽  
Plastic Limit ◽  
Fine Soil ◽  
Index Tests ◽  
Bead Method ◽  
Adequate Reliability

AbstractThe development of liquid and plastic limit tests is reviewed. It is confirmed that the fall cone method is more reliable and reproducible than the Casagrande method for the liquid limit, and this test is adequate for index purposes. The plastic limit has remained effectively unchanged for sixty years and there is no accepted alternative procedure. The Atterberg/Terzaghi rolling bead method is not of adequate reliability and reproducibility. It is proposed that the remoulded shear strength of a fine soil provides a rational basis for index tests. Extrusion and cones have been used to investigate simple methods and it is concluded that both approaches have potential, with the cone test probably being the simpler and more economical approach. Four clay soils were used in the investigation, and it is recommended that a wider range of plastic soils be tested to confirm or otherwise the validity of this approach to index testing.

Aggregation in swelling clay soils

Soil Research ◽  
1973 ◽  
Vol 11 (2) ◽  
pp. 133 ◽  
Author(s):  
KJ Coughlan ◽  
WE Fox ◽  
JD Hughes
Keyword(s):  
Moisture Content ◽  
Probability Function ◽  
Electrolyte Concentration ◽  
Mechanical Action ◽  
Liquid Limit ◽  
Clay Soils ◽  
Aggregate Formation ◽  
Soil Mineralogy ◽  
Swelling Clay ◽  
Aggregate Fractions

Dry sieving, wet sieving, and aggregate bulk density measurements were used to study the mechanisms of dry aggregate formation in three swelling clay soils. These experiments showed that, for a given soil, a single probability function can be used for all dry aggregate fractions to predict their water stability and the distribution of water stable aggregates in their unstable portions. This result is explained in terms of the mode of formation of dry aggregates. Coarse aggregation in these soils was attributed to the binding action of dispersed clay. Soil disruption experiments showed that, above a certain moisture content, soil samples were susceptible to disruption by mechanical action. This moisture content is linearly related to the specific surface area of the soil, and agrees closely with the soil liquid limit. Aggregate disruption in the coarsely aggregated soil sample is explained in terms of soil mineralogy and electrolyte concentration. The effect of rate of reflocculation of disrupted clay on soil aggregation is considered.

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