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The heavy aggregates consist of a gravel or a combination of
gravel or crushed aggregate whose particles are predominantly greater than 5mm
and generally between 9,5 mm and 38mm. Some natural aggregate deposits,
sometimes called gravel of mine, and laughed, lake or marine bed. The crushed
aggregate takes place crushing rock of quarry, stone ball, pebbles, or burdens
of great size. The dreg of high furnace cooled to the air and also crushed is
used like heavy or fine aggregate.
A material is a natural solid substance that ordered internal structure has and
a chemical composition that varies within you limit them very narrow. The rocks
(that depending on their origin can be classified like igneous, sedimentary or
metamorphic), are made up generally of several materials. For example, the
granite contains quartz, feldspar, mica and another whichever minerals; most of
limestone consists of calcite, dolomite and small amounts of quartz, feldspar
and clay. The intemperismo and the erosion of rocks produce stone particles,
burdens, sand, the slime, and clay. Concrete recycled, or concrete of waste
crushed, it is a feasible aggregate source and an economic reality where they
are scarce quality aggregates. The quality aggregates must fulfill certain rules
to give an optimal ingenieril use them: they must consist of durable, clean,
hard, resistant and free particles of absorbed chemical agents, fine clay
coverings and other materials that could affect the moisturizing and the
adhesion the paste of the cement. The aggregate particles that are crumbly or
susceptible to crack are undesirable. The aggregate that contains appreciable
amounts of schist or other schistose rocks, smooth and porous materials, and
certain types of horsteno will have to be avoided in special, since it has low
resistance to the intemperismo and can be cause of defects in the surface such
as eruptions. |
