## SPECIFIC GRAVITY OF CEMENT

**AIM**

To determine the specific gravity is normally defined as the ratio between the weight of a given volume of material and weight of an equal volume of water.To determine the specific gravity of cement, kerosene which doe snot recent with cement is used.

**APPARATUES**

Le Chaterlier”s flask, weighing balance, kerosene (free from water).

Le Chaterlier”s flask, is made of thin glass having a bulb at the bottom. The capacity of the bulb is nearly 250 ml. The bulb is 7.8 cm in mean diameter. The stem is graduated in millimeters. The zero graduation is at a distance of 8.8 cm from the top of the bulb. At 2 cm from the zero, there is another bulb is of length 3.5cm and capacity 17 ml. At 1 cm from bulb, the stem is marked with 18 ml and is grated up to 24 ml. The portion above 24ml mark is in the form of a funnel of diameter 5cm.

** **

**PROCEDURE**

(I) Dry the flask carefully and fill with kerosene or naphtha to a point on the stem between zero and 1 ml.

(II) Record the level of the liquid in the flask as initial reading.

(III) 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.

(IV) 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.

(V) 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 = (Weight of cement/ Weight of equal volume of water)

= W/(V2-V1)

**NOTE**

(I) Duplicate determination of specific gravity should agree within 0.01.

(II) To get more accurate result, the flask should be held in a constant temperature before each reading is taken.

**RESULT**

Specific gravity of a sample of cement =

chandrapal

Dec 30, 2010@ 15:31 pmsir i want to know the details of these

sp gravity of cement

why kerosene is used for finding specfic gravity of cement ?

What is the use of specific gravity test for cement

what is use of specific gravity of cement

how much is the specific gravity of cement

use of finding specific gravity of cement

need of specific gravity of cement

F.M. Rubayet

May 24, 2011@ 18:32 pmDear sir please give me the answer

1. what is the specific gravity of portland composite cement? why specific gravity of cement is required?

Thirumalai

Aug 21, 2011@ 14:28 pmTemperature is an important factor to be considered for the determination of SG.

Thirumalai

Aug 21, 2011@ 14:31 pmGenerally, the Ordinary Portland Cement 3.15

Thirumalai

Aug 21, 2011@ 14:45 pmgenerally, SG of OPC is 3.15

and is used for mix design calculation of concrete

Rozhgar

Nov 11, 2012@ 03:05 amplease i want to know

what is the significance of the specific gravity of cement?

Shehu Ibrahim Abubakar

Jun 17, 2013@ 01:59 amvery good

Akshay R Manohar

Feb 20, 2014@ 14:44 pmNarrative & simple……..

Ashok Kattimani

May 01, 2014@ 07:47 amvery simple way

Arun Jose Vadakkan

Aug 12, 2014@ 17:03 pmeffctive…..

thanks

Tôn Đinh Xuân

Aug 18, 2014@ 09:07 amAdd a comment…