Expanded clay gravel is a round-shaped particle with a molten surface and pores inside.
Expanded clay gravel or expanded clay is divided into various fractions depending on the grain size. GOST 9757-90 provides for the following fractions of expanded clay gravel by grain size: 5-10, 10-20 and 20-40 mm. Grains of less than 5 mm are classified as expanded clay sand.
By bulk density, expanded clay gravel is subdivided into 10 grades: from 150 to 800 (special orders are allowed to produce grades M900 and M1000), and grades of gravel with a bulk density of 200 to 250 kg / m3 are classified as grade 250, and grades 300 are from 250 to 300 kg / m3, etc.
For each brand in bulk density, the standard establishes the requirements for the strength of expanded clay gravel when pressed in a cylinder and the corresponding strength brands.
Water absorption of expanded clay gravel in 1 hour 8-30% depending on the density, frost resistance should be at least 15 cycles [1] .
Application
Expanded clay gravel is used as a porous aggregate for lightweight concrete , and also as a heat-insulating material. Expanded clay gravel is also widely used for the manufacture of expanded clay concrete blocks, from which the external walls and internal partitions of buildings are subsequently built.
See also
- Expanded clay
- Gravel
Notes
- ↑ Interstate standard GOST 32496-2013 "Fillers ... | Dokipedia . Dokipedia.ru. Date of access September 26, 2018.