In curing cement plasters water is sprinkled from time to times. This helps in:

developing interlocking needle-like crystals of hydrated silicates

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hydrating sand and gravel mixed with cement

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converting sand into silicic acid

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keeping it cool

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Solution

The correct option is A developing interlocking needle-like crystals of hydrated silicates
Water develops interlocking needle like crystals of hydrated silicates. The reactions involved are the hydration of calcium aluminates and calcium silicates which change into their colloidal gels.

At the same time, some calcium hydroxide and aluminium hydroxides are formed as precipitates due to hydrolysis. Calcium hydroxide binds the particles of calcium silicate together while aluminium hydroxide fills the interstices rendering the mass impervious.
Hence, the option (A) is correct.

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