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A
concrete dot roller or concrete line roller may be employed to relieve the
smoothness. At the meeting of the National Cement Users' Association already
referred to, the Committee on Sidewalks, Concrete floors, and Streets
recommended the following specifications for the top coat: "Three parts
high-grade Portland cement and five parts clean, sharp sand mixed dry and
screened through a No. 4 sieve. In the top coat, the amount of water used
should be just enough so that the surface of the concrete walk can be tamped,
struck off, floated, and finished within 20 minutes after it is spread on the
bottom coat; and when finished, it should be solid and not quaky." In the
January, 1907, Mr. Albert Moyer is discussing the subject of cement concrete
sidewalk pavements, gives specifications for monolithic concrete slab for
paving purposes. For an example of this construction, he gives the pavement
around the Astor Hotel, New York: "As an alternative, and instead of using
a top coat, make one concrete slab of selected aggregates for base and wearing
surface, filling in between the frames concrete flush with established grade.
Concrete to be of selected aggregates, all of which will pass through a f-inch
mesh sieve; hard, tough stones or pebbles, graded in size; proportions to be 1
part cement, 21 parts crushed hard stone screenings or coarse sand, all passing
a f-inch mesh, and all collected on a f-inch mesh. Tamped to an even surface,
prove surface with straight edge, smooth down with float or trowel, and in
addition a natural finish can be obtained by scrubbing with a wire brush and
water while concrete is 'green,' but after final set." The wearing surface
must be protected from the rays of the sun by a covering which is raised a few
inches above the pavement so as not to come in contact with the surfaces. After
the pavement has set hard you should sprinkle freely with water two or three times
a day for a week or more. The cost of concrete side concrete walks is variable.
The construction at each location usually requires only a few days work; and
the time and expense of transporting the men, tools, and materials make an
important item. One of the skilled workmen should be in charge of the men, so
that the expense of a foreman will not be necessary. The amount of concrete
walk laid per day is limited by the amount of surface that can be floated and finished
in a day. If the surfaces do not work overtime, it will be necessary to stop
concreting in the middle of the afternoon, so that the last concrete placed
will be in condition to finish during the regular working hours. The work of
concreting maybe continued considerably later in the afternoon if a dryer
concrete is used in mixing the top coat, and only enough water is used so that
the surface can be floated and finished soon after being placed. The men who have
been mixing, placing, and ramming concrete can complete their day's work by
preparing and ramming the concrete foundations for the next day's work. The
contract price for a well constructed side concrete walk 4 to 5 inches in
thickness, with a granolithic finish, will vary from 15 cents to 30 cents per
square foot. The concrete curb is usually built just in advance of the side
walk. The concrete foundation is prepared similarly to that of concrete walks.
The concrete curb is divided into lengths similar to that of the concrete walk;
and the joints between the concrete blocks, and also between the concrete walk
and the concrete curb, are made similar to the joints between the concrete
blocks of the concrete walk. The concrete is generally composed of 1 part
Portland cement, 3 parts sand, and 5 parts stone, although a richer mixture of
concrete is sometimes used.
Are You in Manchester New Hampshire? Do You
Need Concrete Cutting?
We Are Your Local
Concrete Cutter
Call 603-622-4441
We Service Manchester
NH and all surrounding Cities & Towns