Q. What is the allowed reduction of water with super plasticizers without reducing workability?

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Q. Is it possible to use w/c ratio as low as 5?

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Q. What is the limitation of Carboxylic acids in High range water reducers?

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Q. What is accelerator?

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Q. What is retender?

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Q. NaOH is the example of retenders.

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Q. Zinc is the example of retenders.

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Q. Retarders are used to ___________

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Q. At normal temperatures addition of sugar _____________ per cent have little effect on the rate of hydration.

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Q. Pick up the correct statement from the following.

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Q. Setting time of cement increases by adding ____________

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Q. Retarders used at grouting oil wells, where temperature is about _____________ ºC.

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Q. Minute spherical bubbles of size ranging from ______________ microns.

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Q. What is Silica Fume?

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Q. Silica fume is ______________

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Q. Concrete containing silica fume can have very __________ strength and can be very __________

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Q. Content of SiO₂ in silica fume is ___________

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Q. Content of CaO in silica fume?

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Q. The specific surface (m²/kg) of silica fume.

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Q. Specific Gravity of silica fume.

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