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Per §10.8 (Step 9, Trial Mix), the calculated mix proportions are verified by casting at least how many cube specimens per trial mix?
A{'text': '3 cubes of 150 mm size per single trial mix', 'label': 'A'}
B{'text': 'Just 1 cube specimen per single trial mix', 'label': 'B'}
C{'text': 'About 20 cubes per single trial mix', 'label': 'C'}
D{'text': 'About 30 cubes per single trial mix', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': '3 cubes of 150 mm size per single trial mix', 'label': 'A'}
1. §10.8 Step 9: 'The quantity of materials for each trial shall be sufficient for at least three 150 mm size cube concrete specimens and concrete required to carry out workability test according to IS 1199-59.'
2. The workability of trial mix 1 is measured and water adjusted (per Table 10.9) to hit the design CF; then trial mixes 3 and 4 vary w/c by ±10% to plot the strength vs w/c curve.
_Source: IGNOU ET-522 Block-3 Unit-10 Concrete Mix Design, §10.8 Step 9, p. 19_
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