15%
20%
22%
25%
3.5 N/mm2
7.0 N/mm2
10.5 N/mm2
14.0 N/mm2
to impart plasticity
to make the brick durable
to prevent shrinkage
to make the brick impermeable
5 to 10%
20 to 30%
50 to 60%
70 to 80%
impermeable
brittle and weak
to lose cohesion
to crack and warp on drying