The common name of "Qingshizi" in architecture. Bluestone is broken with a crusher, and its scientific name is bluestone. Melon seeds are processed gravel with a particle size of 5- 10mm, commonly known as melon seeds, which are widely used in decoration foundation projects.

The main chemical composition of gravel in building materials is silicon dioxide, followed by a small amount of iron oxide and a small amount of elements and compounds such as manganese, copper, aluminum and magnesium.

There are granite, limestone, quartzite and composite silicates with different compositions. Structurally speaking, there are magmatic rocks, sedimentary rocks, metamorphic rocks, and then river transport, and the proportion of each place is different.

Extended data

The stone with coarse aggregate size of concrete not more than 20mm is commonly known as "melon seeds", and the technical term is "fine stone";

1, fine stone (melon seeds) concrete is generally used for leveling buildings, floors, roofs or structural surfaces, precast reinforced concrete slabs, prestressed circular hole slabs, other precast concrete components, and thin-section reinforced concrete components (such as thin web beams, gutters, water tanks, etc.). ), and the reinforcement in the component is densely arranged, and the clear distance is small.

2. According to "Pebbles and Crushed Stones for Building" GB/T14685-2011,when the continuous particle size of stone is 5 ~15 ~ 25mm or the single particle size is 5 ~10mm/60.

3. The selection of the maximum particle size of general concrete coarse aggregate shall meet the following requirements:

It shall not be greater than 1/4 of the minimum size of the cross section of the concrete structure, and shall not be greater than 3/4 of the minimum clear distance of steel bars;

For concrete solid slab, its maximum particle size should not be more than 0/2 of the slab thickness, and should not exceed 50 mm ..

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