Natural (ground natural stone, natural and ground sands, etc.) and artificial substances of various sizes, strength and hardness, which together with binders create the structure of the hardened mortar. According to GOST 31189.
Note 1 . Lightweight aggregates are natural and artificial aggregates with high porosity and low bulk density, used to reduce the bulk density of the hardened mortar and increase its yield.
Note 2 . The largest grain size of aggregates is the maximum size of aggregate particles included in the dry mixture and determined by a laboratory analytical method.
Filler is a natural or artificial loose stone material that forms a rigid skeleton of hardened mortar or concrete, reducing shrinkage and preventing the formation of shrinkage cracks during hardening.