liquid limit and plastic limit test of soil pdf

Liquid Limit And Plastic Limit Test Of Soil Pdf

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The plastic limit is one of the measured parameters of the Atterberg limits test ASTM, , which is used for differentiating consistency states of finer particles in soil material. If coarser particles are present coarse sand, gravel, cobbles , the finer particles act as matrix and may govern the behavior of the soil mass. Consistency states depend on water content; with increasing water, the consistency states are solid, semisolid, plastic, and liquid. The plastic limit is the water content at which a soil-water paste changes from a semisolid to a plastic consistency as it is rolled into a 3. The Atterberg limits test also includes the plasticity index, which is calculated as the difference between the liquid limit and the plastic limit.

Atterberg Limits: A Quick Reference Guide

Historical Version s - view previous versions of standard. More D The liquid limit, plastic limit, and plasticity index of soils are also used extensively, either individually or together, with other soil properties to correlate with engineering behavior such as compressibility, hydraulic conductivity permeability , compactibility, shrink-swell, and shear strength. See Section 6 , Interferences. When subjected to repeated wetting and drying cycles, the liquid limits of these materials tend to increase.

The amount of increase is considered to be a measure of a shale's susceptibility to weathering. Comparison of the liquid limit of a sample before and after oven-drying can therefore be used as a qualitative measure of organic matter content of a soil see Practice D Users of this standard are cautioned that compliance with Practice D does not in itself assure reliable results.

Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors. The specimen preparation procedure to be used shall be specified by the requesting authority. If no specimen preparation procedure is specified, use the wet preparation procedure. The method to be used shall be specified by the requesting authority. If no method is specified, use Method A.

These limits distinguished the boundaries of the several consistency states of plastic soils. Therefore, the relative contribution of this portion of the soil to the properties of the sample as a whole must be considered when using these methods to evaluate the properties of a soil. The values given in parentheses after SI units are provided for information only and are not considered standard.

In this system, the pound lbf represents a unit of force weight , while the unit for mass is slugs. This implicitly combines two separate systems of units; that is, the absolute system and the gravitational system. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard.

The SI values given in Fig. In addition, they are representative of the significant digits that generally should be retained. It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design.

It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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Atterberg limits

Contents [ hide show ]. The consistency and behavior of a clayey soil is different as are the engineering properties at varying degrees of moisture content. Thus, the boundary between each state can be defined based on a change in the clay's behavior. Swedish scientist Albert Atterberg was the first person to define the limits of soil consistency for the classification of fine-grained soils and later, they were refined by Arthur Casagrande. Depending on the water content of a soil, the soil may be in one of four states: solid, semi-solid, plastic and liquid.

Determination of Plastic Limit is as important as Liquid Limit so as to ascertain Plasticity Index, Ip of the soil. The plastic limit of a soil is the moisture content.

Atterberg limits

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The Atterberg limits are a basic measure of the critical water contents of a fine-grained soil : its shrinkage limit , plastic limit , and liquid limit. Depending on its water content , a soil may appear in one of four states: solid, semi-solid, plastic and liquid. In each state, the consistency and behavior of a soil is different and consequently so are its engineering properties.

Undrained shear strength of a soil at the liquid limit water content can be considered to be around 1. Plasticity index of soils has been defined by one school of thought as a range of water content producing a fold variation in their undrained shear strength. The undrained shear strength-water content relationship has been found to be linear in the log—log plot for a wide range of water contents beginning from around the plastic limit to near the liquid limit. Normalization of undrained shear strength—water content relationship in a log—log plot has led to the conclusion that the water content at the liquid limit and at the plastic limit, obtained by cone penetration, could also be uniquely related. This contradicts the original understanding of Atterberg limits, namely liquid and plastic limits which are two independent parameter not related at all.

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Soils intended to support structures, pavements, or other loads must be evaluated by geotechnical engineers to predict their behavior under applied forces and variable moisture conditions. Soil mechanics tests in geotechnical laboratories measure particle size distribution, shear strength, moisture content, and the potential for expansion or shrinkage of cohesive soils. Atterberg limits tests establish the moisture contents at which fine-grained clay and silt soils transition between solid, semi-solid, plastic, and liquid states. In , Swedish chemist and agricultural scientist Albert Atterberg was the first person to define the limits of soil consistency for the classification of fine-grained soils. Karl Terzhagi and Arthur Casagrande recognized the value of characterizing soil plasticity for use in geotechnical engineering applications in the early s. Casagrande refined and standardized the tests, and his methods still determine the liquid limit, plastic limit, and shrinkage limit of soils. This blog post will define the Atterberg limits, explain the test methods, and discuss the significance of the limit values and calculated indexes.

The authors would like to thank the discusser for his interest in their paper and for his contributions on the mechanisms taking place within the plastic limit test. This, however, depends on the purpose for which a plasticity index is required. While both equations 14 and 15 are statistically significant, it could be argued that these correlations would improve if a plastic limit value based on a strength criterion were available rather than the current one based on ductility. The authors disagree with the discusser that the rolling of a thread in the plastic limit test corresponds to triaxial extension with equal stresses applied around the circumference of the thread.

Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils 1


Arber G.

Organic soils in particular undergo changes as a result of oven-drying or even extended air-drying. Other soils containing clay may agglomerate, lose absorbed.


Christine F.

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Danielle S.

Historical Version s - view previous versions of standard.


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