The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than

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• The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called
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• An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. sieve No. 9, more than
• The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as
• While compacting the concrete by a mechanical vibrator, the slump should not exceed
• For compacting plain concrete road surface of thickness less than 20 cm, we use
• For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be
• In case of hand mixing of concrete, the extra cement to be added is
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