Identify the percentage passing for aggregate of $20 \, \text{mm}$ nominal size for $10 \, \text{mm}$ IS sieve designation?
$0-20\%$
The question asks for the acceptable range of material passing a 10 mm sieve when testing aggregates designated with a 20 mm nominal size. This falls under the standard specifications for aggregate grading.
Understanding Aggregate Grading Standards
Indian Standard IS 383:1970 provides specifications for coarse aggregates used in concrete. Aggregate grading ensures that the concrete mix has desired properties like workability, strength, and durability. The nominal size refers to the maximum aggregate size (MSA) in the sample.
IS 383:1970 Specification for 20 mm Aggregate
According to IS 383:1970, Table 2 (Grading of Coarse Aggregates), the requirement for aggregates with a nominal size of 20 mm includes the following:
- Percentage passing the 20 mm sieve: 100%
- Percentage passing the 10 mm sieve: 0% to 20%
- Percentage passing the 4.75 mm sieve: 0% to 5%
This specification indicates that for a 20 mm nominal size coarse aggregate, the amount of material finer than the 10 mm sieve should not exceed 20% by weight.
Identifying the Correct Percentage Range
Based on the IS 383:1970 standard, the acceptable percentage passing for the 10 mm sieve for 20 mm nominal size aggregate is the range from 0% to 20%.
Therefore, the correct option is 0-20%.
Important Questions from Aggregates
The impact value of aggregate is calculated for understanding which one of the following characteristic property of aggregate?
The fineness modulus of fine aggregate is 2.78 and of coarse aggregate is 7.82 and the desired fineness modulus of mixed aggregate is 6.14. What is the amount of fine aggregate to be mixed with one part of coarse aggregate?
The aggregate impact value of the aggregate used in _______.
SSD condition of fine or coarse aggregates means-
The particle size of an aggregate bigger than 4.75 mm but smaller than 75 mm is known as-
