Materials Passing No. 200 Sieve in Aggregates

This test determines the amount of materials finer than the No. 200 (0.75 mm) sieve in aggregate by washing. Materials removed may include clay, silt, and other water-soluble substances present in the aggregates.

Equipment and Apparatus Needed:
- 1 pc No. 200 Sieve
- 1 pc No. 8 Sieve or 1 pc No. 16 Sieve
- 1 pc Drying Pan
- 1 pc Basin or any clean container
- Digital Balance

Procedure:

1. Take the sample prepared during sample preparation.
2. Oven dry the sample overnight.
3. Take the sample out from the oven, cool to room temperature, and weigh. Record the original unwashed mass obtained as B.
4. Pour the sample into a clean container, add tap water, and stir and agitate the sample.
5. Pour the wash water into nested sieves (No. 8 or No. 16 and No. 200) with No. 200 at the bottom.
6. Repeat the washing procedure until the wash water that passes through the No. 200 sieve is clear.
7. During the whole operation, ensure that all particles of sand coarser than the No. 200 sieve are accounted for.
8. Place the washed aggregate in the drying pan.
9. Place the drying pan with the washed sand in the oven set at a temperature of 105°C.
10. The following day, take out the sample from the oven and cool it to room temperature.
11. Solve for the amount of materials passing the No. 200 sieve (A).

Calculation:

\[ A = B - C \]

Where:
- A = Materials Passing No. 200 Sieve
- B = Original Unwashed Mass
- C = Washed Oven Dried Mass

The "Materials Passing No. 200 Sieve" test determines fine particle content in aggregates. A sample is dried, weighed (B), washed, sieved (No. 200), and dried again (C). Calculate fine materials passing No. 200 sieve (A = C - B) to assess aggregate quality for construction.

The "Materials Passing No. 200 Sieve" test is a common procedure used in the construction industry to determine the amount of fine particles present in aggregates, which can impact the properties of concrete and other construction materials. The procedure involves the following steps:

Prepare a sample of the aggregate.

Oven dry the sample to remove any moisture.

Weigh the dried sample to obtain the original unwashed mass (B).

Place the sample in a container, add tap water, and agitate to wash out the finer materials.

Collect the wash water and pass it through a series of nested sieves, with the No. 200 sieve at the bottom.

Repeat the washing until the wash water passing through the No. 200 sieve is clear.

Ensure that all sand particles coarser than the No. 200 sieve are properly accounted for.

Dry the washed aggregate in an oven at 105°C.

Weigh the dried washed aggregate to obtain the washed oven-dried mass (C).

Calculate the amount of material passing the No. 200 sieve (A) using the formula: A = C - B.

This test is crucial in assessing the quality of aggregates and understanding their particle size distribution. Excessive fines can affect the workability and strength of concrete. The procedure helps ensure that the aggregate meets specifications for construction applications.

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