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Per §3.3, the most reliable test for the suitability of a doubtful water for concrete is:
A{'text': 'Whether the water is fit for human drinking purposes', 'label': 'A'}
B{'text': 'Whether its pH lies strictly between 6 and 8 only', 'label': 'B'}
C{'text': 'Whether the water carries under 1000 ppm dissolved salts', 'label': 'C'}
D{'text': 'Compare 7 / 28-day strength of cubes vs distilled-water cubes', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'Compare 7 / 28-day strength of cubes vs distilled-water cubes', 'label': 'D'}
1. §3.3 reads: 'the best course to find out whether a particular source of water is suitable for concrete making or not, is to make concrete with this water and compare its 7 days and 28 days strength with companion cubes made with distilled water. If the compressive strength is upto 90 percent, the source of water may be accepted.'
2. Drinking-fitness and pH alone are not conclusive per the same paragraph.
_Source: IGNOU ET-522 Block-1 Unit-3 Water, §3.3, p. 42_
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