Specifications of First class brickwork

Sunday, September 17, 2017 9:46
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Specifications of First class brickwork

  • All of the bricks used should be of first class.
  • See the characteristics of first class bricks .
  • Soaking of bricks should be done by submerging in a tank before use.
  • Soaking should be continue until the air bubbles are ceased.
  • Soaking should be for a period of 12 hour before use.

Mortar specifications for first class brickwork

  • Material of mortar should be of standard specifications.
  • For mortar, cement should be fresh ordinary Portland cement of standard specifications.
  • Sand should be sharp and free from organic and foreign particles.
  • If we want to make rich mortar, sand should be coarse or medium.
  • For weak mortar, local fine sand may be used.
  • Cement sand ratio of mortar should be 1:3 to 1:6 as specified.
  • To get the required proportion, materials of mortar should be measured with the measuring box.
  • Materials of mortar should be first mixed dry to have a uniform color.
  • The platform should be clean for mortar mixing.
  • Mixing should be done at least three times.
  • Then water should be added gradually for workable consistency.
  • Mortar should be freshly mixed.
  • Old mortar should not be used.
  • Mortar should be mixed with water for one hour work so that mortar may be used before setting.

Lime Surkhi mortar

  • If specified lime surkhi mortar, should be mixed in 1:2 to 1:3 ratio as specified, by grinding in mortar mill for at least three hours to use on the same day.
  • Lime should be fresh and should be screened.
  • Fresh mixed mortar should be used.
  • For small work, hand mixing may be allowed just as in the case of cement sand mortar.

Laying of first class brickwork

  • Bricks should be laid in English bond unless otherwise specified.
  • Every course of brick should be horizontal.
  • Wall should be truly in plumb.
  • Vertical joints of consecutive brick layer should not come on each other.
  • Vertical joints of alternate brick layer should come directly over one another.
  • Closers should be of clean cut bricks.
  • Closers should be placed at the end of the walls but not at the other edge.
  • Best shaped brick should be used for face work.
  • Mortar joints should not exceed 6 mm or 0.5 inch in thickness.
  • Joints should be fully filled with mortar.
  • Bricks should be laid with frogs upwards except in the top brick layer.
  • In the top course of brickwork, frog should be laid downward.
  • Brickwork should be done for 1 meter or 3 feet height at a time.
  • When one part of the wall has to be delayed then stepping should be done at an angle of 45 degree.
  • Projections where made should not be more than 1/4th of the brick in one course.
  • All joints should be raked and faces of wall should be cleaned at the end of every day’s work.

Curing of First class brickwork

  • Brickwork should be kept wet for the period of at least 10 days.
  • Top of the walls should be flooded with water at the end of the days work by making small weak mortar edging to contain at least 2.5 cm or 1 inch deep water.

Other considerations for first class brickwork

  • Brickwork should be protected from the effect of sun, rain, frost etc., during the construction.
  • Suitable Scaffolding should be provided to facilitate the construction of brickwork.
  • Scaffolding should be strong enough to withstand all the expected loads to come upon them.

Measurement of First class brickwork

  • Brickwork should be measured in cubic meter or cubic feet.
  • Different kinds of brickwork with different mortar should be taken under separate item.
  • Thickness of wall should be taken as multiple of half brick.
  • For example half brick wall thickness is taken as 10 cm or 4.5 inch.
  • Full brick wall thickness is taken as 9 inches or 20 cm and so on.
  • Rate should be for the complete work including scaffolding and all tools and plants used.

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