Some important points for the Site Civil Engineer
Cement mortar should be used within 30 minutes immediately after addition of water. Mortar left unused for two hoursshould be rejected.
Mixing time in mechanical mixture: Concrete: 2 min. Mortar: 1min.
Tolerance on weight for round and square bars worked on the base 0.785 kg/sq. cm of cross sectional area per metre run. Upto and including 8 mm: + 4 percent Over 8 mm: + 2.5 percent.
Weather range for placing concrete 4.5°C to 38°C
Curing time for :
(a)Plain cement concrete -14 days
(b) Flooring -10 days
(c)Reinforced cement concrete -10 days
(d) Plastering & Pointing -7 days
(d)Brick work & stone work -7 days
Bond stone: At least one bond stone (for wall thickness 60 cm.) or set of bond stones with overlap of 15 cm. (for wall thickness more than 60 cm.) shall be provided for every 0.5 sq m. of wall surface of stone masonry.
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