The surface of the concrete structure of a new construction is covered

The surface of the concrete structure of a new construction is covered with straw/gunny bags by wetting. This is done to :

[amp_mcq option1=”prevent fast evaporation, until hydration has proceeded well” option2=”protect the concrete structure from contamination by dust particles” option3=”prevent development of any fungus on the surface” option4=”give smoother and cleaner surface over cement structure” correct=”option1″]

This question was previously asked in

UPSC CDS-2 – 2024

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The curing of concrete involves maintaining adequate moisture and temperature for a period after placing to allow the cement to properly hydrate and gain strength. Covering the concrete surface with wet straw or gunny bags helps to prevent the rapid evaporation of water from the concrete mix. This ensures that enough water is available for the complete hydration of cement, leading to the development of the concrete’s intended strength, durability, and surface properties.

– Hydration is the chemical reaction between cement and water that hardens concrete.
– Proper curing requires maintaining moisture content.
– Rapid evaporation leads to incomplete hydration, reduced strength, increased permeability, and potential cracking.

Other curing methods include ponding (flooding the surface), spraying, using wet coverings like burlap, or applying curing compounds that form a membrane to seal in moisture. Curing should continue for a sufficient period, typically several days to weeks, depending on the type of cement, mix design, strength requirements, and environmental conditions.

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