Classification: Fine Aggregate.

Typical Size: Typically passes entirely through a #4 Sieve (4.75 mm), but S1 is specifically the extremely fine material that settles, often listed as 0–5 mm or #4 to #100 sieve. It frequently looks like Sieve size #4 to #100.

Description: This is the finest grade of processed sand. When dry, it has a powdery texture. When damp, it can be clumped. It is often a byproduct of crushing larger rocks (Manufactured Sand).

Primary Uses: Fine finishing for plastering, mortar for thin-bed bricklaying, and sometimes as a fine bedding layer for paving blocks.

Classification: Intermediate or fine Coarse Aggregate.

Typical Size: The material is often designated as 1/8 inch (approximately 3 mm) up to 3/8 inch (9.5 mm). The image's FINE AGGREGATE/PEA GRAVEL section, specifically the coarser particles listed under Sieve size #4 to #10, demonstrates this texture.

Description: This consists of small, often rounded pebbles (Pea Gravel) or tiny angular chips. It is large enough to be clearly seen as individual stones, but too small for structural concrete mixes on its own.

Primary Uses: Common in decorative landscaping, exposed aggregate finishes, precast concrete items (like concrete blocks), and sometimes for pipeline bedding.

Classification: Coarse Aggregate (G1 or G2).

Typical Size: This is the workhorse of construction, commonly known as 3/4 inch aggregate (nominal 20 mm). The image's MEDIUM AGGREGATE/COARSE GRAVEL pile is the precise match, often showing a distribution from Sieve size 1/4" to #4 or up to the full

3/4 inch mark.

Description: These are substantial, angular rocks or river-run gravels. The individual stones are typically between 12 mm and 20 mm in size. The angularity (like crushed stone) provides better interlock in concrete than rounded gravel.

Primary Uses: The main structural aggregate used in standard concrete mixes for foundations, columns, beams, suspended slabs, and road base construction.