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Per §10.8 (Step 5, Table 10.9), the correction to sand percentage when the available fine aggregate is in Zone I (instead of the standard Zone II) is:
A{'text': '+1.5 percent to sand content', 'label': 'A'}
B{'text': 'No change (zero correction)', 'label': 'B'}
C{'text': '-1.5 percent to sand content', 'label': 'C'}
D{'text': '-3 percent to sand content', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': '+1.5 percent to sand content', 'label': 'A'}
1. Table 10.9 lists Zone corrections for sand: Zone I = +1.5%; Zone III = -1.5%; Zone IV = -3%. Water-content correction for any zone-only change is 0.
2. The standard reference is fine aggregate conforming to Zone II of IS 383.
_Source: IGNOU ET-522 Block-3 Unit-10 Concrete Mix Design, Table 10.9, §10.8 Step 5, p. 18_
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