Answer / ravisobhan

7 days strngth is at 2/3rds of 28days stength. this is
required to check the concrete strength gaining in view of
removing formwork and to take preautionary measures incase
of failures before deshuttering.

Answer / roby

For cement concrete the setting time is a dependent out put depending on type of cement..type & max dia of aggregates,admixtures..environmental conditions and al..inspite of all this IS:456-1984 suggest tat about 66.7%....but still it has to be performed in lab nd checked.......

Answer / balaji

compressive strength of 28 days cube is more than the 7
days cube

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