Well
most of us know that specific gravity of cement is in between 3.1-3.16 g/cc. Do
you know why we calculate the Specific gravity of cement and its significance?
In this post, I will clear all of your doubts regarding the specific gravity of
cement.
What
is Specific Gravity?
Specific
Gravity is the ratio of a Weight of Volume of material (Your testing material)
to the same Weight of Volume of water. In simple words, we are comparing the
volume of our Testing material either it may be sand, cement, aggregate with
the same volume of water at certain temperature.
Specific Gravity (Sg)=
We
calculate Specific gravity to know the behaviour of the material in water.
Every material has its own specific gravity, and it usually ranges between 0.1
– 100. If the specific gravity of the material is less than 1, then that
material floats in water. If the material has a specific gravity greater than
1, then it sinks in water. We know that specific gravity of cement or Density
of cement is ranging between 3.1-3.16g/cc by this, cement is 3.16 times heavier
than water of the same volume.
Excessive
presence of moisture content in cement effects Workability and strength of
cement. For Nominal mix design, the specific gravity of cement should be
3.15g/cc.
AIM:
To determine the specific gravity of cement.
Apparatus:
1.
Cement
2.
Kerosene
3.
Specific Gravity Bottle capacity of 250 ml with stopper.
4.
Weighing balance with 0.1 gm accurate
FIGURE:
Procedure:
1. Dry the flask carefully and fill with
kerosene or naphtha to a point on the stem between zero and 1 ml.
2.
Record
the level of the liquid in the flask as initial reading.
3.
Put
a weighted quantity of cement (about 60 gm) into the flask so that level of
kerosene rise to about 22 ml mark, care being taken to avoid splashing and to
see that cement does not adhere to the sides of the above the liquid.
4. After putting all the cement to the
flask, roll the flask gently in an inclined position to expel air until no
further air bubble rise3s to the surface of the liquid.
5.
Note
down the new liquid level as final reading.
OBSERVATION AND CALCULATIONS:
(I)
Weight of cement used =W gm
(ii)Initial
reading of flask =V1 ml
(iii)Final
reading of flask =V2 ml
(iv)Volume
of cement particle= V2-V1 ml
(v)weight of equal of water= ( V2-V1)
x specific weight of water.
Specific Gravity of cement (Sg)=
Sg = W/(V2-V1)
RESULT:
Specific gravity of a sample of cement =__________.You Might also like:
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