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Specification for different classes of Brickworks
- 1. SPECIFICATIONAND CONTROL SPECIFICATION FOR 1ST, 2ND AND 3RD CLASS BRICKWORK PRESENTED BY VIGHNESH B RANE
- 2. INTRODUCTION Bricks may be defined as Structural units of rectangular shape and convenient size that are made from a suitable type of clays by molding, drying and burning. Brick work are probably the most common building elements in construction of a house in India. These walls form basic units for creating rooms that make up a house. The walls besides being space dividers are also structural elements that transfer the load of the roof to the ground. Brick walls are constructed on strip spread or raft foundations that support the walls. The walls are constructed using bricks and mortar. These can also be constructed with various structural qualities and thicknesses. Brick walls are constructed by joining bricks with cement mortar in arrangements called English Bond, Flemish Bond or Rat Trap Bond. These bonds give different external appearances to the wall. All construction systems of brick walls are such devised that vertical cross joints in any layers are staggered. The bricks thus bonded form a solid mass that does not split when the wall is loaded with live loads and dead loads.
- 3. GENERAL CLASSIFICATION OF BRICKWORK The classification of brick work according to the quality of brick is following. First class brick work Second class brick work Third class brick work
- 4. FIRSTCLASS BRICKWORK INTRODUCTION First class brick work is made by using first class bricks and cement mortar.This brick work is used for load bearing walls. It is made in rich mortar in which the cement and sand ratio is from 1:3 to 1: 6. First class bricks are identified by their uniform color and a ringing sound when struck.The bricks are equal in size and have even edges and surfaces.These bricks do not chip and dont have any cracks. First class bricks do not absorb water more than 1/6 of their weight. There is no salty residue when the bricks are dry. First class bricks have a minimum crushing strength of 105.kg. Per sq. cm
- 5. FIRSTCLASS BRICKWORK SPECIFICATIONS Plain surface, sharp edges and size with tolerance in dimensions +- 3% Uniform red or brownish colored. High crushing strength, not less than 10.7 N/mm2 Machine moulded Efflorescence- NIL Water absorption less than 15%. USE: They are used for the exterior wall brick works, short columns and arches.
- 6. SECOND CLASS BRICK WORK INTRODUCTION Second class bricks work is made by using second class bricks and cement mortar.These bricks also have the property of first class bricks but are not very regular or even in shape.These bricks should not be used for load bearing walls for more than two storey buildings. Second class bricks have minimum crushing strength 70.kg per sq. meter. Slight difference in the structure on fractured surfaces is admissible. Used for exterior work when plastering is to be done. And can also be used for interior works but they may not be used for flooring.
- 7. SECOND CLASS BRICK WORK SPECIFICATIONS Slightly uneven faces and edges with tolerance in dimensions +- 8% Uniform colored but may be slightly over burnt. High crushing strength, not less than 7 N/mm2 Hand moulded Efflorescence- Little Water absorption less than 20%. USE: They are used for internal walls and compound walls.
- 8. THIRDCLASS BRICKWORK INTRODUCTION This type of brick work is made by using third class bricks and cement mortar or mud mortar.Third class brick work is not made in any Govt. work. Generally this type of brick work is made for temporary work in private sector.These are not burnt so fully as in previous two cases but are generally of uniform reddish yellow color. Defects in uniformity or shape are tolerated. On striking together, they produce a dull thud sound. Its compressive strength lies between 35 70 kg/cm2 and absorption between 22 25 percent.They are used mostly in the ordinary type of construction and in dry situations.
- 9. THIRDCLASS BRICKWORK SPECIFICATIONS May be distorted with blunt edges. Over burnt or under burnt and non uniform color. High crushing strength, not less than 3.5N/mm2 Hand moulded Efflorescence- Large Water absorption less than 25%. USES: They are used for flooring, paving, small brick foundations and brick bat lime concrete(B.B.L.C.).