Q. How to improve the workability of concrete.

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Q. What is workability?

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Q. What is the compaction factor for low degree of workability?

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Q. The slurry, in its movement down the kiln, encounters a progressively higher temperature. At first, the water is driven off and __________ is liberated.

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Q. For complete hydration of cement the w/c ratio needed is ________

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Q. The minimum water to cement ratio for cement concrete to hydrate is _______

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Q. Approximate percentage range of A₂O₃ in OPC is _______

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Q. What is the percentage of iron oxide in white cement?

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Q. What is the percentage of air by volume in Air Entraining Cement?

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Q. What is curing?

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Q. In a dry environment, concrete strength will be loosed as much as _________ % in the moist environment.

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Q. Concrete placed in cold weather will take __________ time to gain strength.

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Q. After finishing concrete surface must be kept _________

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Q. Dry intervals in surface wetting leads to __________

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Q. Contractors place blankets over the concrete to ____________

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Q. Well cured concrete _________ thermal, plastic and drying shrinkage cracks.

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Q. Which method is the most common and cheaper for water curing?

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Q. The hydration that provides the initial mix and chemical bond of the concrete’s ingredients is the _________

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Q. What is the full form of rH?

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Q. This image has _________

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