# Liquid Limit of Soil, Test, graph, Atterberg limits, lab report, calculation

Saad Iqbal | 🗓️Modified: January 3, 2023 | ⏳Read Time: 6 min | 👁Post Views: 225

The liquid limit of soil is a measure of the moisture content at which soil transitions from being a solid to a liquid. It is an important property of soil as it affects the soil’s engineering properties and its ability to support structures.

To determine the liquid limit of soil in the laboratory, a standard procedure is followed. The first step is to prepare the soil sample by thoroughly mixing it and reducing it to a uniform consistency. Next, the soil sample is placed in a liquid limit device, which consists of a horizontal groove on a brass block. A spatula is used to spread the soil uniformly over the groove.

The next step is to perform the liquid limit test. The sample is repeatedly sheared using a device called a Casagrande Apparatus. The number of blows required to close the groove to a certain depth is recorded. This process is repeated for different moisture contents of the soil sample until a flow curve can be plotted between the number of blows and the moisture content.

To calculate the liquid limit, the flow curve is used to determine the moisture content at which 25 blows are required to close the groove to a certain depth. This value is taken as the liquid limit of the soil.

## Importance of Liquid Limit of Soil

The liquid limit of soil is an important property as it determines the soil’s behavior under different moisture conditions. It helps in the design and construction of foundations, roads, and other structures. A soil with a high liquid limit is more prone to plastic deformation and can be less stable than a soil with a low liquid limit.

In conclusion, the liquid limit of soil is an important property that affects the engineering behavior of soil. It is determined by performing a standard liquid limit test in the laboratory and plotting a flow curve between the number of blows and moisture content. The liquid limit is an important factor in the design and construction of foundations, roads, and other structures.

## Liquid Limit of Soil Calculator

Moisture Content at 25 Blows: %

It is a simple and most accurate calculator that just asks you to enter the moisture content and number of blows for the soil sample. It will automatically plot the graph and show the moisture content corresponding to 25 blows of Casagrande apparatus (i.e. liquid limit).

## Prepare Sample for liquid limit

To prepare soil sample for liquid limit test, follow these steps: