BRICKS Standard sizes are 190 x 90 x 40 mm, with mortar the size comes out to be 200 * 100 x 50 mm However, the old size of * x *giving masonry of rxa x are still used in many parts of India. Clay suitable for making bricks contain Alumina -20 to 30% is desirable Downloaded From: www.Easytngneenng.net Silica - 50 to 60% is desirable Lime - 5% is desirable Downloaded F'rom : www.EasyEngineening.net Iron oxide-5 to 6% Magnesia- A small quantity only Pebbles, vegetable and organic matter, excess lime, iron pyrites, sulphates of calcIum and potassium are harmful. Manufacture of bricks involves preparation of clay, moulding, drying and burning processes. 1. Preparation of clay: It involves unsoling, digging, cleaning, weathering, blending and tempering: pug mills are used tor tempering 2. Moulding: t may be by hand moulding or by machine moulding . Drying: lt may be by natural dryıng or by artificial dryıng . Burning: t may be in clamps or in kilns. Intermittent and continuous kilns ar...