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Per §3.3.1, suspended particles in mixing water do NOT affect the strength of concrete up to a content of approximately:
A{'text': '0.02 percent by weight of water', 'label': 'A'}
B{'text': '0.001 percent by weight of water', 'label': 'B'}
C{'text': '0.5 percent by weight of water', 'label': 'C'}
D{'text': '5 percent by weight of water', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': '0.02 percent by weight of water', 'label': 'A'}
1. §3.3.1 reads: 'The presence of suspended particles of clay and silt in the mixing water upto 0.02 percent by weight of water does not affect the properties of concrete.'
2. IS 456-1978 allows 2000 ppm of suspended matter; higher loads need a settling basin.
_Source: IGNOU ET-522 Block-1 Unit-3 Water, §3.3.1, p. 42_
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