Specific Gravity is only contrast between the weight of a mass of a Specific material at a given temperature and the weight of the same volume of water.

Calculating whether the object is worthy of falling or floating on water is a cost. That substance has a certain specific gravity. Typically the cost is in digits such as 0.1–100. If the cost is below 1, the product floats on ice. If quality approaches 1, the product must fall.

Why We Calculate Specific Gravity of Any Substance

We calculate the specific gravity of any substance to know the behavior of the material in water. And we can know the material will sink or floats in the water. All of the materials in our environment have a fixed specific gravity. The usual range is 1-100. If the specific gravity is greater than 1, then it sinks in water. If the specific gravity is less than 1 it floats in water. So if the specific gravity of any substance is known to us we can use the materials in a suitable place of any work.

Specific gravity essentially determines how much stronger the material is than the equivalent quantity of liquid and comparison content. Cement’s specific gravity varies from 3.1 to 3.16 g / cc. By this argument, we can make sure that the same amount of concrete is 3.1-3.16 times heavier than water. And in liquid, it drops. Because the acceleration is greater than 1.

Every material is made up of so many tiny pores that can hold voids. And when any vacancy is found in the substance, a material is worthless. If the concrete due to bad weather conditions is affected by excessive moisture content, then the specific gravity of cement may be as high as 3.19. If the specific gravity value reaches 3.19, the moisture fills the pores in cement. Cement undergoes a chemical reaction when this phase is called hydration when combined with atmospheric moisture. Moisture in concrete is very dangerous. When hydrated with water, concrete is useless.

Standard Value of Specific Gravity of Cement

Portland cement’s specific gravity value is generally around 3.15, while portland-blast-furnace-slag and portland-pozzolan cement may have specific gravity values around 2.90.

How to Calculate Cement Specific Gravity?

Using the Le Chatelier Flask process, one can easily determine the value of the specific gravity of cement. Since this is an example, it is easy to determine the specific gravity of concrete at the site stage.

Required Materials & Apparatus

• Kerosene
• Ordinary Portland Cement
• Le-Chatelier Flask of 250 ml or Specific Gravity Bottle / Pycnometer of 100 ml
• Weighing balance with 0.1 gm accurate

Specific Gravity Test Procedure for Cement

• The Lechatlier flask should be clear of moisture content, which requires a detailed drying of the bottle.
  Now, measure and label the full flask as W1.
• Take and add 50gm of cement in Flask. Now balance the Flask with the stopper as W2 Then dump in the test kerosene up to the bottle’s rim. Mix thoroughly and see that in the bottle there are no air bubbles remaining.
• Write down the weight as W3 Remove the flask and fill the bottle up to the top of the bottle with kerosene and report the weight as W4.

Specific Gravity Calculation

Cement specific gravity formula:

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