Q. Why the time period for removal of form work has to be increased.

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Q. If concrete is exposed to repeated freezing and thawing after the final set, the final qualities of the concrete may also be __________

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Q. Large temperature differentials within the concrete member may promote __________

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Q. When the concrete in fresh stage is exposed to freeze before certain pre-hardening period, compressive strength may get __________

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Q. Concrete is not recommended to be placed at a temperature above _________ºC.

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Q. IS: 7861 part-1 deals with ___________

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Q. A higher temperature of fresh concrete results in a __________ hydration of cement.

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Q. Does this reduce handling time?

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Q. Rapid evaporation may cause plastic shrinkage __________

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Q. It is difficult to retain moisture for hydration for rapid evaporation of water during curing period.

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Q. Prepacked concrete _________ water proofing concrete.

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Q. Cement has ________ % volumetric shrinkage after curing.

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Q. After vacuum mixing, the volumetric shrinkage can be raised from 3–5% to __________ % in different cements.

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Q. Vacuum mixing systems reduce the exposure by _________ %.

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Q. The exposure of conventional mixing in open bowl is about ___________ ppm in the breathing zone.

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Q. The __________ compressive strength required from structural consideration.

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Q. The adequate workability necessary for ___________ compaction with the compacting equipment available.

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Q. ___________ water-cement ratio content to give adequate durability for the particular site conditions.

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Q. _______ cement content to avoid shrinkage cracking due to temperature cycle in mass concrete.

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Q. ________ has designated the concrete mixes into a number of grades as M10, M15.

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