Per §10.10 (High Strength Concrete Mix), the use of a SUPERPLASTICIZER…

Question

Per §10.10 (High Strength Concrete Mix), the use of a SUPERPLASTICIZER allows the water content to be reduced (at the same workability) by approximately:

Accepted Answer

C. {'text': 'About 25 to 30 percent', 'label': 'C'}

1. §10.10(a): 'Use of superplasticizer allows reduction of water by 25 to 30 percent for the same workability requirement. Keeping quantity of cement constant, the reduction of water leads to lowering of water/cement ratio which following Abram's rule increases the strength of concrete.'
2. Condensed silica fume (CSF) is the other high-strength route — 10-15% addition has reportedly achieved 100 N/mm² concrete.
_Source: IGNOU ET-522 Block-3 Unit-10 Concrete Mix Design, §10.10, p. 24_

Answer

{'text': 'About 5 percent', 'label': 'A'}

Answer

{'text': 'About 50 to 60 percent', 'label': 'B'}

Answer

{'text': 'About 90 percent', 'label': 'D'}