| Sr No. | PARTICULAR | FLYASH BRICKS | CLAY BRICKS |
|---|---|---|---|
| 1 | Manufacturing Process | Machine moulding and water curing in open area | Hand moulding and air drying & burning |
| 2 | Raw material | Flyash, Lime, Zypsum, Sand | Clay |
| 3 | Colour | Light Grey, Red | Red |
| 4 | Size | Uniform size with sharp right angle, edges 230 x 110 x 75 mm | Un uniform in size and shape |
| 5 | Weight | 2.75 kg./no. | 3 kg./no |
| 6 | Compressive strength | 50 to 70 kg/cm2 | 30 to 35 kg /cm2 |
| 7 | Dry density | 1450 kg/m3 | 1800 kg/m3 |
| 8 | Breakage | Less than 1% | More than 6% |
| 9 | Water absorption | Less than clay bricks | Higher |
| 10 | Nos.of bricks require for masonary work of one Cu.Mtr. | 440 nos | 475 nos |
| 11 | Cement mortar require for plasteras well as masonary work | 5 to 7 % less because of uniform size and shape of bricks | More because of un uniform size & shape of bricks |
| 12 | Efflorescence | Slight | Moderate |
| 13 | Resistance to salinity | Good | Poor |
| 14 | Water seepage | Almost nill | Moderate |
| 15 | Erosion property | Nil | Erosion often seen at plinth lavel |
| 16 | Fire rasistance | Better | Good |
| 17 | Resistance to termite | Good | Poor |