Concrete Cutting Cutter Lawrence MA Mass Massachusetts
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Concrete Cutter
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MA and all surrounding Cities & Towns
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Lawrence
Massachusetts Concrete Cutting and Core Drilling
Concrete
must never be placed under water if there is any current, because the cement
will be washed away, leaving only the sand and stone. Another method for depositing
concrete under water is to pass the concrete slowly through a spout or tube
which reaches to within a couple of inches of the bottom where the concrete is
to be placed. The tube must be kept full and the concrete kept moving
continuously and slowly through it. On large work specially designed buckets
are used for depositing the concrete under water, but these are generally
operated by a derrick. Surface finish of concrete may be for either of two
purposes: To make the concrete more water-tight, or to improve the appearance.
It is advisable to leave the outside surface of the concrete just as it comes
from the forms, having used care in placing to see that there are no stone
pockets or voids; or else to take off the skin of cement so as to expose the
sand and stone and leave an even but slightly rough surface. On exterior surfaces a coat of pure cement
will check with fine hair cracks because of the rapid drying out of the mortar.
However, for the interior of a tank which will be kept wet while in use, a coat
of neat cement may serve to make the concrete more water-tight. Put this on
just as soon as the forms are removed, and take off forms as early as possible.
In small pieces of concrete, like a small concrete trough, the inner form may
be removed within two or three hours, and the wash applied immediately. Leave
the outside forms, however, until the concrete is hard. Wet the inside surface
thoroughly and apply the pure cement with a brush or a trowel. The best method
of obtaining a good outside finish is to rub off the skin of cement which comes
to the surface next to the forms and thus expose the sand.
There
are various ways of doing this. The easiest way is to remove the forms as soon
as the concrete is set, which for a wall may be in 24 or 48 hours; just as
soon, in fact, as the concrete will bear the pressure of the thumb. Wet the
surface thoroughly, and rub it either with a brick, with a board, with a
plasterer's wooden float, or with a carbide block. By this plan the surface can
be simply smoothed or the skin of cement can be taken off to leave a sandy
finish, or by still further work the stones can be exposed. The resulting
finish, while rough, should be uniform and pleasing. If the concrete has
hardened, the skin of cement can be removed with a tool. A stone cutter's bush
hammer can be used for this, or a tool can be made with a toothed edge.
Plastering on exterior surfaces requires great care and skill to prevent
cracking and peeling.
The
forms in which the concrete is laid must be wet instead of oiled. Roughen the
surface, either when the concrete is green, by rubbing off the cement, or by
picking the hardened surface with an old hatchet or a stone axe. Wet thoroughly
and apply as thin a layer as possible, about 1/16 inch thick is best, of mortar,
one part granulated Portland Cement and one part fine, but very clean, sand.
For thick layers, pick and wet the surface, then brush on a thin coat of pure
cement grout on a small part of the surface, and before this has begun to
stiffen apply the plaster. Reinforced concrete is ordinary concrete in which
iron or steel rods or wire is imbedded. Reinforcement is required when the
concrete is liable to be pulled or bent, as in beams, floors, posts, walls or
tanks, because, while concrete is as strong as stone masonry, neither of these
materials has nearly so much strength in tension as in compression. Moreover,
concrete alone, like any natural stone, is brittle, but by imbedding in it
steel rods or other reinforcement, the cement adheres to the metal and binds
the particles together so that the reinforced concrete is better adapted to
withstand jar and impact. Even railway bridges are built, not only in arch
form, like a stone arch, but in some cases like a steel girder bridge, with a
flat reinforced concrete floor supported by horizontal beams of the same
material
Are You in Lawrence Massachusetts? Do You
Need Concrete Cutting?
Call 800-799-9151
We Service Lawrence
MA and all surrounding Cities & Towns
| Concrete Cutting Lawrence MA |
Concrete Cutting Lawrence Massachusetts |
| Concrete Cutter Lawrence MA |
Concrete Cutter Lawrence Massachusetts |
| Concrete Coring Lawrence MA |
Concrete Coring Lawrence Massachusetts |
| Core Drilling Lawrence MA |
Core Drilling Lawrence Massachusetts |
| Concrete Sawing Lawrence MA |
Concrete Sawing |
| Concrete Cutting MA |
Concrete Sawing Lawrence Mass |
| Concrete Cutting Lawrence Mass |
Concrete Cutting Lawrence Massachusetts |
| Concrete Cutter Lawrence Mass |
Concrete Coring Mass |
| Core Driller Lawrence MA |
Core Drilling Lawrence Mass |
Lawrence
Massachusetts Concrete Cutting and Core Drilling
