DEFINITION, ARTI, PENGERTIAN AGGREGATE

AGGREGATE
Agrégat
Building Materials; Metallurgy
1. The entire inert constituents in the proportion
of certain mortars or concrete.
2. A microscopic constituent of chemically
heterogeneous steel.
AGGREGATE
Granulat
Building Materials
1. A granular substance from a set of solid
elements between 0 and 100 mm approximately;
these elements undergo a preparation (sifting,
crushing, etc.) and are used in civil engineering
and public works for making hydraulic concrete
and pavement (roadway) layers.
2. All the inert noncohesive constituents that,
agglomerated by a binder, constitutes the
skeleton of the mortar and concrete. It is a
granular material of a natural or artificial source.
An aggregate is indicated by two numbers
representing the smallest and largest dimensions
of its grains (for example: 5/25). The aggregates
are classified according to their origin (natural or
artificial), their density (heavy or light), and their
size. To obtain good regularity of the grain-size
composition of concrete, the mineral skeleton is
made up in the concrete mixing plant from three
sand fractions, which are usually
We can classify aggregates as
standard (les granulats courants): natural
products, either rolled by water and with rounded
grains, or crushed and with angular grains, not
having undergone transformation different from
mechanical (sifting, crushing, washing). In this
category are
round aggregates (les granulats dit roulés),
obtained by sifting and washing the alluvial
materials, which usually give rounded shapes,
crushed aggregates (les granulats concassés),
obtained by crushing eruptive or sedimentary
rocks, which usually give angular forms,
mixed aggregates (les granulats mixtes), round
crushed aggregates that are made up of
aggregates of rounded form and the others of
angular forms;
natural light or manufactured (les granulats
légers naturels ou fabriqués): based on mineral
matter (pumice, pozzolana, clays and expanded
shales, fly ash, expanded polystyrene, etc.) used
for certain constructions;
heavy (les granulats lourds): used for certain
categories of concrete, among which are scraps,
iron pellets, magnetite, barite;
vegetable (les granulats végétaux): constituted
by wooden fibers or shavings agglomerated with
cement and compressed.