Tiêu đề NOTES BCEM (U-1).pdf ✅

RUNGTA COLLEGE OF ENGINEERING AND TECHNOLOGY, BHILAI Department of Civil Engineering 4 CIVIL DARSHAN binding the brick particles together. 4 Oxide of iron 5-7 1. Same as lime and gives hardness and strength. 2. It increases durability and impermeability of bricks. 1. Red oxide gets converted into black oxide during burning, which on combining with silica provides dark brown or dark blue colour which is not good. 5 Magnesia <1 1. It imparts yellow tint and decreases shrinkage. 1. It causes brick to decay.  Harmfull constituents of brick earth- 1. Pebbles of gravel and stone 2. Vegetation and organic matter 3. Alkalies 4. Lime stone and kankar 5. Iron pyrite 6. Reh or Kallar & carbonaceous matter  Manufacturing of Bricks- 1. Preparation of brick earth 2. Moulding of bricks 3. Drying of moulded bricks 4. Burning of dried bricks 1. Preparation of brick earth- 1. Unsoiling- Scraping top layer of soil about 150-250 mm depth, because it contain impurities. 2. Digging- After unsoiling, the brick earth is then dug upto 0.6-1.2 m. 3. Cleaning and powdering- Then brick earth is cleaned of stones, pebbles, kankar and the excavated lumps of soil are broken to reduce them in powdered form. 4. Weathering- The process of softening of dug out clay by little water and exposing it to the atmosphere is known as weathering. It improves plasticity and strength of the bricks. 5. Blending- It is then mix with sandy soil and other deficient content and then mix thoroughly. 6. Tempering- The process of kneading brick earth by water to get homogeneous mass and plasticity.