Superplasticizer increases slump of concrete due to which phenomenon?
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A.
Densification of cement particles
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B.
Drying of cement particles
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C.
Dispersion and deflocculation of cement particles
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D.
Deterioration of cement particles
Correct Answer:
C. Dispersion and deflocculation of cement particles
Explanation:
Superplasticizers increase the slump of concrete primarily through the dispersion and deflocculation of cement particles. When added to a concrete mix, these admixtures adsorb onto the surface of cement grains, giving them a negative surface charge. This creates electrostatic repulsion and steric hindrance, which breaks down the natural flocculated structures that trap water. By neutralizing these attractive forces, the particles are separated, and the formerly trapped water is released, significantly increasing the flowability and workability of the fresh concrete without requiring additional water.
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