This collection provides a quick review of the basic terminology used in the VU aggregate optimization system. For a more detailed examination of the word forms and sentence structures introduced here, click on any of the terms to visit a glossary page, where you’ll find numerous examples and expanded discussions.
Used Terms in VU aggregate optimization system
Definition of aggregate: Also known as “aggregate”, granular materials that play a skeleton and filling role in concrete and mortar, that is, we often call sand and stone.
Concrete: An artificial stone obtained after hardening by mixing gelling materials, water and aggregates in an appropriate proportion to make a mixture.
The largest proportion of concrete is aggregate.The most stable component in concrete is aggregate.The quality of the aggregate determines the quality and ratio of the concrete.
Natural sand: Naturally formed rock particles with a particle size of less than 4.75 are divided into mountain sand, river sand, and sea sand.
Artificial sand: The rock is mined, mechanically broken, and sieved into rock particles with a nominal particle size of less than 4.75mm.
Mixed sand: natural sand and artificial sand are combined in a certain proportion.
Gravel: Natural rocks, pebbles or mine waste stones are mechanically broken and sieved into rock particles with a particle size greater than 4.75mm.
Pebbles: Rock particles with a particle size greater than 4.75mm formed by natural weathering, water flow handling, sorting, and accumulation.
Mud content: The particle content of natural sand and stone with a particle size of less than 0.075mm.
Mud content of sand: The nominal particle size in the sand is greater than 1.25mm, and after washing and hand-kneading, it becomes less than 630µm particles.
The mud content of the stone: The nominal particle size in the stone is greater than 5.00mm, and after washing and hand-kneading, it becomes less than 2.50mm particle content.
Stone powder content: The particle size in the artificial sand is less than 75um, and its mineral and chemical composition are the same as the processed parent rock particle content.
Apparent density: The mass of aggregate particles per unit volume (including inner closed pores).
Bulk density: The mass of the unit volume of the aggregate in the natural accumulation state.
Compact density: The mass per unit volume of the aggregate after compaction according to the prescribed method.
Needle-like particles: Those whose length of rock particles is greater than 2.4 times the average particle size of the particle class to which the particles belong are needle-like particles; those whose thickness is less than 0.4 times the average particle size are sheet-like particles.
Crushing value index: The ability of artificial sand, gravel, and pebbles to resist crushing.
Alkali-active aggregates: aggregates that can react chemically with the alkali in the concrete under certain conditions, causing the concrete to expand, crack or even destroy.
Robustness: The ability of the aggregate to resist cracking under the action of climate, environmental changes, or other physical factors.
Light matter: Substances with an apparent density of less than 2000kg/m3 in sand.