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Conclusions on the concrete one.
Although from the first cases of the concrete one always there was interest by
its durability was in you complete decades when it acquired greater relevance by
the required rogations to give maintenance to the numerous structures that were
deteriorated prematurely. During some time, this problem I am associated mainly
with the harmful effects when being from the cycle of freezing and defrosting of
the concrete one, thus I do not consider the due importance him in the regions
that by its situation geographic severe winter climate does not experience. The
modern technology of the concrete one demands that the structure of the concrete
one is as resistant as is desired and that simultaneously it has supported to
the conditions of exhibition and services to severe which put under during its
life utility. In order to obtain the previous thing it is required of the
knowledge of the behavior of all the ingredients that takes part in the concrete
one and his correct metering.
THE CONCRETE MIXED RECIEN.
The concrete one just mixed must by hand be plastic or semi-fluid and able to be
molded. A very humid mixture of concrete can be molded in the sense that it can
be placed in a centering, but this does not enter "the plastic" definition that
material that is folding and able to be molded or to be formed like a lump of
clay to molder. In a plastic mixture concrete all the sand grains and the stone
or gravel pieces that were boxed and maintained in suspension. The ingredients
are not ready to secrete itself during the transport; and when the concrete one
hardens, it is transformed into a homogenous mixture of all the components. The
concrete one of plastic consistency does not crumble if not that flows as I
eliminate viscous without secreting itself. The reveniment is used as a
measurement of the consistency of the concrete one. A concrete one of low
reveniment has a hard consistency. In it practices it of the construction, the
thin elements of concrete and the strongly reinforced elements of the concrete
one require of workable mixtures, but never of mixtures similar to a soup, to
have facility in their positioning. A plastic mixture is needed to have
resistance and to maintain its homogeneity during the handling and the
positioning. Whereas a plastic mixture is adapted for the majority with works
with concrete, it is possible to be used superfluidificantes additives to add
fluidity to the concrete one in strongly reinforced concrete members of thin or.
MIXED: The 5 basic components of the concrete one are separately in the figure
"" making sure that they are combined in a homogenous mixture is required of
well taken care of effort and. The sequence of load of the ingredients in the
mixer one represents an important paper in the uniformity of the finished
product. Nevertheless, that sequence can be varied and even so to produce
concrete of quality. The different sequences require adjustments in the time of
additionally of water; in I number total of revolutions of the drum of the mixer
one, and in the speed of revolution. Other important factors in the mixed one
are the size of the revolt in the relation to the size of the drum of the mixer
one, the time passed between the metering and the mixed one, the design, the
configuration and the state of the mixer drum and the trowels. The mixer ones
approved, with operation and correct maintenance, a reload, folded and kneaded
assure an interchange materials of end to end by means of action of the revolt
on if same to measurement that mixes the concrete one. |
