alleryStart learning →As laid down by IS 383:1970 (Table 2.4 of the source), the sum of the percentages of all deleterious materials in concrete aggregate shall not exceed:
A3 percent of total mass
B15 percent of total mass
C10 percent of total mass
D5 percent of total mass
Answer & Solution
Correct answer: D. 5 percent of total mass
1. §2.2.10 states: 'IS 383:1970 has laid down Limits of Deleterious Materials as tabulated in Table 2.4. It is stipulated that sum of the percentage of all deleterious materials shall not exceed five.'
2. Individual caps in Table 2.4 (coal/lignite, clay lumps, shale, etc.) each sit below this five-percent total ceiling.
_Source: IGNOU ET-522 Block-1 Unit-2 Aggregates, §2.2.10 and Table 2.4, p. 24_
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