What equipment is used for gradation testing on fine aggregate?

Gradation testing is a crucial process in concrete and aggregate testing to determine the distribution of particle sizes in fine aggregate. Fine aggregates typically consist of material that passes through the No. 4 sieve, and the equipment used for this testing must effectively separate particles based on size.

Round sieves, specifically woven wire mesh sieves, are the standard equipment for this purpose. The round shape allows for even distribution of the aggregate during the shaking process, and it facilitates efficient separation of materials. The round sieves create a larger effective surface area for sieving and provide consistency in testing due to the uniformity of the mesh.

Flat sieves, square sieves, and dome sieves are not commonly used for this specific testing process. Flat sieves may not allow for effective separation due to their design, and square or dome shapes do not meet the industry standards for grading fine aggregates. Therefore, round sieves are the appropriate choice for gradation testing on fine aggregates, ensuring accurate determination of particle size distribution.