polystyrene bricks conclusion

5.1.1 UNIVERSEL TESTING MECHIN

            = load/area                              

 Field work brick                =7.5KN (chamber brick)

                                                      =(7500/9.81)/(22.5x10.5)

                                                      =31.75kg/sq.cm.

STANDARD COMPRESSIVE STRENGTH OF BRICK(IS-CODE)

1.Common bricks                      =35kg/sq.cm.

2.Second class brick                    =70kg/sq.cm.
     3.Crushing strength of bricks not less than 140
      Kg/sq.cm. are graded as AA class.

CURING STRENGTH DETAIL:

DAYS	BRICK 1	BRICK 2	BRICK 3	AVERAGE
7 DAYS	9.3KN	9.5KN	9.7KN	9.5KN
14 DAYS	10.8KN	11KN	11.2KN	11KN
28 DAYS	15.9KN	16KN	16.1KN	16KN

DAYS	CALCULATION	RESULT
7 DAYS	=(9500/9.81)/(0.2X0.1)	=48.42 kg/sq.cm
14 DAYS	=(11000/9.81)/(0.2x0.1)	=56.07 kg/sq.cm
28 DAYS	=(16000/9.81)/(0.2x0.1)	=81.54 kg/ sq.cm

 

5.2 WATER ABSORPTION OF BRICK

OBJECTIVE

For determination of water absorption of bricks.Water absorption gives an idea of strength of  having more water absorption are more porous in nature and are generally considered unsuitable unless they are found to be acceptable based on strength.

PROCEDURE

1.      The specimen is dried in a ventilated oven at a temperature of 105 to 115⁰C; till it attains substantially constant mass. The specimen is cooled to room temperature and its weight is recorded (M₁)

2.      The dried specimen is immersed completely in clean water at a room temperature of 27±2⁰C for 24 hours.

3.      The specimen is then removed and any traces of water are wiped out with a damp cloth and the specimen is weighed. The weighing is completed 3min after the specimen has removed from water(M₂) 

CALCULATION

Water absorption, percent by mass after 24 hours immersion in cold water is given by the following formula

 

REPORTS

The water absorption of brick shall be reported to the nearest one percent.

INITIAL WEIGHT	FINAL WEIGHT	FORMULAE	WATER ABSORPTION %
W1=2.005	W2 =2.223	=((2.223-2.005)/2.005)X100%	= 10.87%
W1=2.022	W2=2.255	=((2.255-  2.022)/2.022)X100%	=%  11.25

 FORMULA:

= ((w2-w1)/w1) x 100%

Average water absorption =(10.87+11.25)/2

=11.06%

condition is not for more than 20%. The water absorption test is successful.

5.3EFFLORESCENCE TEST :

OBJECTIVE

For determination of efflorescence of bricks 

PROCEDURE

1.      A shallow flat bottom dish containing sufficient distilled water to completely saturate the specimens is used for the test. The ends of the bricks are placed in the dish, the depth of immersion in water being 25 mm.

2.      The whole arrangement is placed in a warm (between 20⁰C and 30⁰C) well ventilated room until all the water in the dish is absorbed by the specimens and the surplus water evaporates.

3.      The dish containing the brick is covered with a suitable glass cylinder so that excessive evaporation from the dish may not occur.

4.      When the water has been absorbed and brick appears to be dry, a similar quantity of water is placed in the dish and it is allowed to evaporate as before. Examine the bricks for efflorescence after the second evaporation and the results are reported. 

REPORTS

The liability to efflorescence shall be reported as ‘Nil’, ‘Slight’, ‘Moderate’, ‘Heavy’ or ‘Serious’ in accordance with the following definitions

(a) Nil : When there is no perceptible deposit of efflorescence

(b) Slight : When not more than 10 percent of the exposed area of brick is covered with a thin deposit of salts

(c) Moderate : When there is a heavier deposit than under ‘Slight’ and covering up to 50 percent of the exposed area of the brick surface but unaccompanied by powdering or flaking of the surface.

(d) Heavy : When there is a heavy deposit of salts covering 50 percent or more of the exposed area of the brick surface but unaccompanied by powdering or flaking of the surface.

(e) Serious : When there is a heavy deposit of salts accompanied by powdering and / or flaking of the exposed surfaces 

 one day the curing of polystyrene brick.

                        =the salt is NILL value   

RESULT:

           The efflorescence test is safe condition.

5.4 ESTIMATION OF BRICK RATE:

SAND CALCULATION:

1m³ river wet sand             =1600 kg (reference standard)

3 unit weight of sand rate =Rs 8000

1kg weight of sand             =(3x1600)/8000=Rs 0.6

1.2 kg sand rate                  =Rs 0.72

CEMENT CALCULATION:

Standard rate                           =Rs 5600/tone

400 gram rate                          =(5600/1000)x0.4

                                                   = Rs 2.240

5.5 POLYSTYRENE (THERMACOL) CALCULATION:

polystyrene properties:

Thermacol conductivity =0.033 w/m

Density                              =0.96 g/cm³

Unit rate(1 sheet)            =Rs 5.60

33 gram rate                     =0.033x5.60x0.96

                                            =Rs 0.177

OTHER COST:

Labour cost                      = 865/1000bricks

                                           =Rs 0.865

Water cost                        =180/1 unit

                                           =Rs0.180

TOTAL COST:

1 Brick rate                      =Rs 4.0(10 paisa less than or more than

                                              rate of brick)

CONCLUSION

By using of  57.14% light weight coarse aggregate as a partial replacement to artificial coarse aggregate compressive strength is above required value. The weight of brick decrease with the replacement of  artificial aggregate by polystyrene beads. The compressive strength of brick is found to decrease weight and increase high strength of polystyrene brick .