impermeable

brittle and weak

to lose cohesion

to crack and warp on drying

190 mm x 90mmx 80 mm

190 mm x 190 mm x 90 mm

200 mm x 100 mm x 100 mm

200 mm x 200 mm x 100 mm

5 to 10%

20 to 30%

50 to 60%

70 to 80%

cracking and warping of bricks

loss of cohesion

enhancing the impermeability of bricks

none of the above

alumina

silica

iron

magnesia