GENERAL NOTES FOR CIVIL ENGINEERS.

General Notes for civil Engineers

  • Electrical conduits shall not run in column
  • Earth work excavation for basement above 3 m Should be stepped form
  • Any Back filling shall be compacted 95% of dry density at the optimum moisture content and in layers not more than 200mm for filling above structure and 300 mm for no structure
  • If soling is specified than the soling stones shall be laid at 45° TO 60° inclination and filling the voilds between them with sand, gravel or moorum.
  • All reinforcement shall be free from mill scales, loose rust and oil or other impurities.
  • By providing proper cover blocks, spacers, chairs etc. All the reinforcement shall be placed and maintained in position as position as shown in structural drawing.
  • Cement shall be 43 grade ordinary portland cement conforming to IS:8112 or 53 grade ordinary portland cement conforming to IS:12269-1987.
  • Cement shall stored in dry places on a raised platform about 200 mm above floor level and 300 mm away from the walls.
  • Water used for both mixing and curing shall be clean and free from injurious amounts of oils, acids, alkalies, salts, suger and organic materials or other substances that may be deleterious to concrete or steel. The pH water generally between 6 to 8 for construction uses.
  • Cement shall be tested for its setting time. The initial setting time of cement is 230 minutes and final setting time of cement is 600 minutes.
  • Sample from fresh concrete shall be taken and at least a set of 6 cubes of 150 mm shall be prepared and cured. 3 cubes each at 7 days and 28 days shall be tested for compressive strength. 
  • Water cemnt ratio for different grades of concrete shall not exceed 0.45 for M20 and above and 0.50 for M10 / M15 With appropriate mix design and preliminary tests.


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