Atterberg boundaries-एटरबर्ग सीमाएं

Significance and use of Atterberg boundaries

Atterberg boundaries are determined by empirical methods for remoulded soils. The information obtained from it is not directly used, but it indicates the various engineered properties of the soil, such as permeability, compressibility and strength. These are also called index properties. 31 Liquid limit and plasticity index are used in soil identification and classification. The liquid limit and the compact limit indicate the amount of clay in the soil. Plasticity index increases with the amount of clay sized particles. The high value of w, and I is indicative of very compact soil. The simple relationship between the fluid limit and plasticity index on the engineering properties of soil is given in Table 2.1.

Table 2.1.

No.	Quality	Comparing those soils with the same fluid range if the index "Ip"is increasing	Comparing those soils that have the same solubility, if the solubility index is the same, if the fluid limit is increasing
1.	Permeability	Decreases	Increases
2.	Compressibility	Remains almost constant	Increases
3.	Dry strength	Increases	Decreases
3.	Chimerism	Grows up	Happens less

The Slope of the flow curve describes the nature of variation in the soil as well as the change of shear strength along with the water content. So if the flow curve of the soil is flat then its shear strength will be higher than the flow curve with Steep slope. The fluid boundary is sometimes used for the pavement designs from the semi-empirical method. Shrinkage limit refers to the effects on the volume of soil by changing the amount of water. If the shrinkage limit is low, then soil swelling starts on the water content itself.