After the abrasion test, the sample is passed through which sieve?

The correct answer is option 'C', which is a 1.7 mm sieve.

Explanation:

The abrasion test is conducted to determine the resistance of aggregate samples against the wearing action of steel balls. It is an important test in the field of civil engineering as it helps in evaluating the durability and quality of aggregates used in construction.

After the abrasion test is performed, the sample is passed through a sieve to separate the aggregates into different size fractions. This is done to determine the particle size distribution of the sample and to classify it according to certain specifications.

In this case, the sample is passed through a 1.7 mm sieve. This means that any particles larger than 1.7 mm will be retained on the sieve, while particles smaller than 1.7 mm will pass through.

Importance of Sieving:

Sieving is a commonly used method for separating particles based on their size. It is an essential step in the analysis of aggregates as it provides valuable information about the gradation and particle size distribution, which have significant implications on the performance of the material in various applications.

Particle Size Distribution:

The particle size distribution of an aggregate sample is a key factor in determining its engineering properties. It affects the workability, compactability, and strength characteristics of concrete and asphalt mixtures.

Standard Sieve Sizes:

Sieves are available in different sizes to accommodate various particle sizes. The most commonly used sieve sizes in civil engineering are determined by international standards, such as the ASTM (American Society for Testing and Materials) and IS (Indian Standard) specifications. These standards provide guidelines for the selection of sieve sizes based on the desired application and the type of material being tested.

In this case, the 1.7 mm sieve size is likely specified by the relevant testing standard or specification for the abrasion test. The specific sieve size may vary depending on the testing method or the requirements of the project.

Conclusion:

After the abrasion test, the sample is passed through a sieve to determine the particle size distribution. In this case, the sample is passed through a 1.7 mm sieve. This step is crucial in evaluating the quality and durability of aggregates used in construction.