Polystyrene conducted on cement

TEST CONDUCTED ON CEMENT

3.7.1 FINENESS TEST

The fineness test of cement has an  important on the rate of hydration and hence on the rate of gain of strength. To find the fineness of the given cement, the edquipment required is IS sieve 90 micron.

PROCEDURE

100 gram of the given cement is weighed accurately and is placed on is sieve and is sieved continuously for 15 minutes by circular and vertical motion. The experiment is repeated with fresh samples and result are tabulated.

                

   

FIGURE 3.1 Is sieve 90 micron 

TABLE 3.4 Fineness test for cement

SL NO	WT.OF  SAMPLE TAKEN(W1)g	WT.OF RESIDUE(W2)g	PERCENTAGE WEIGHT OF RESIDUEx100
1	100	7	7
2	100	6	6

RESULT:

Thus from the results we infer that the fineness of the cement is 6.5% and the fineness requirement of cement as a residue should not exceed 10% for ordinary Portland cement.

3.7.2 CONSISTENCY TEST

The basic aim to find out the water content required to produce a cement paste of standard consistency as specified by the IS specification using vicat apparatus.

PROCEDURE

Take about 300g of cement , mix about 25%water by weight of dry cement thoroughly to get a cement paste and filled in to a vicat mould with in 3-5 min. after filling the mould completely, smoothen the surface, making it level with top of the mould. Place the whole assembly under the plunger . lower the plunger gently so as to touch the surface of the test block and quickly release the plunger allowing it to sink into the paste. Measure the depth of penetration and record it. Prepare trial paste with varying percentage of water content and follow the steps as described above , until the depth of penetration becomes 33to 35mm. the particular water % is the standard consistency of the cement.

TABLE 3.5 Consistency test for cement

SL NO	WT.OF CEMENT(g)	QUANTITY OF WATER ADDED IN %	QUANDITY OF WATER ADDED IN (ml).	PENETRATION OF PLUNGER FROM BOTTOM(mm)
1	300	26	78	35
2	300	27	81	30
3	300	28	84	14
4	300	29	87	8
5	300	30	90	5

RESULT

`           The standard consistency of the cement is30%

3.7.3 The Properties of Water

Water is the most abundant compound on Earth's surface. In nature, water exists in the liquid, solid, and gaseous states. It is in dynamic equilibrium between the liquid and gas states at 0 degrees Celsius and 1 atm of pressure. At room temperature (approximately 25 degrees Celsius), it is a tasteless, odorless, and colorless liquid. Many substances dissolve in water, and it is commonly referred to as the universal solvent.

TABLE 3.8 WATER PROPERTIES

Properties
Molecular formula	H2O
Molar mass	18.01528(33) g/mol
Appearance	White solid or almost colorless,  transparent ,with a slight hint of blue, crystalline solid or liquid.
Density	1000 kg/m3,liqid (40C) (62.4 lb/cu. Ft)  917 kg/m3,solid
Melting point	0 0C, 32 0F; (273.15 k)
Boiling point	99.98 0C, 211.97 0F (373.13 K)
Acidity (p ka)	15.74 ~35-36
Basicity (p kb)	15,74
Refractive index (ƞD)	1.3330
Viscosity	0.001pas at 200c
Structure
Crystal structure	Hexagonal
Molecular shape	Bent
Dipole moment	1.85 D