How do you determine specific gravity of cement?

W3 = weight of flask + cement + kerosene. W4 = weight of flask + kerosene. 0.79= specific gravity of kerosene. Limit: Specific gravity of cement = 3.15 g/cc.

How do you find the specific gravity of a powder?

The specific gravity, then, may be determined by dividing the weight of a substance in grams by its volume in c.c.; but it is more convenient in practice to determine it by dividing the weight of the substance by the weight of an equal volume of water.

How do you perform a specific gravity test?

The normal method of determining specific gravity is to weigh the specimen dry (DW), then to suspend the specimen in water on a string, and to measure the weight pulling on the string (WW) (specimen weight suspended in water). Then you subtract WW from DW, and divide the difference into DW.

Why do we test specific gravity of cement?

The cement particles have pores or particles that can contain water within it. A nominal mix is prepared with a cement of specific gravity 3.15. Any change in this value of specific gravity will affect the mix design. Hence, it is necessary to test the specific gravity of the cement procured before mixing process.

Is code for determination of specific gravity of cement?

As per Le Chatelier’s Principle, Specific gravity of cement is determined by Le Chatelier’s Flask method. And the IS code for Specific gravity test is IS 2720- Part 3.

Can you measure specific gravity without a hydrometer?

To get an accurate specific gravity reading, you need 2 measurements – mass and volume. So you need 2 tools – a scale and a container. And that’s all it takes to find out exactly how much water is in your glaze so you can make adjustments from there.

Why specific gravity test of cement is done?

Why do we calculate specific gravity of cement?

Specific gravity is an important property of cement being related to its density and viscosity. It is one of the factor to determine density of cement. If the specific gravity of cement is more than 3.19 then it has more moisture content, which will affect the mix and bonding.

Why specific gravity test is done?

A urine specific gravity test compares the density of urine to the density of water. This quick test can help determine how well your kidneys are diluting your urine. Urine that’s too concentrated could mean that your kidneys aren’t functioning properly or that you aren’t drinking enough water.

Why kerosene is used for finding specific gravity of cement?

Kerosene is used to determine the specific gravity of cement because when water is used while experimenting (testing), it starts to react with the cement and forms calcium oxide (CaO). This affects the experiment but kerosene does not react with cement and does not affect the experiment.

How do you find the specific gravity of cement?

For example, to determine the specific gravity of cement will consider water as reference substance. In simple words, the specific gravity determines whether the material will sink or float in water. Every material has its own specific gravity and the value normally varies from 0.1 to 100.

What is the specific gravity of a nominal mix?

A nominal mix is prepared with a cement of specific gravity 3.15. Any change in this value of specific gravity will affect the mix design. Hence, it is necessary to test the specific gravity of the cement procured before mixing process. This is the main reason why we ignore the use of old stock cement.

Why kerosene is used to calculate specific gravity?

To calculate specific gravity for any material, we have to use water. But water reacts with cement and forms calcium oxide. So that we are using Kerosene. It doesn’t react with cement.

How do you find the volume of a concrete mix?

The absolute volume of a concrete mix can be determined if the weight and bulk specific gravity of the components are known. For a concrete mix with 90-lbs of coarse aggregate with Gs = 2.65, 60-lbs of fine aggregate with Gs = 2.63, 25-lbs of cement, and 12-lbs of water the absolute volume is computed as follows: CA FA Cement Water