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
lime stone and alumina
silica and alkalies
alumina and iron
alkalies and magnesium