Chestnut Hill
Concrete Cutting Cutter Chestnut Hill MA Mass Massachusetts
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Chestnut
Hill Massachusetts Concrete Cutting and Core Drilling
Lumber
for the making of concrete forms is usually priced per 1,000 F.B.M. One F.B.M. is a one-inch
board one foot long and twelve inches wide, or a two-inch plank one foot long
and six inches wide. On
The Cement Centennial in 1924 somebody called portland cement the "Magic of Concrete."
It's not far from the truth when you stop to think about it. Limestone and
shale are ground together to the fineness of talcum powder, run into an
enormous rotating kiln, where the mixture is burned at hell-roaring white heat
until it forms a new chemical substance, discharged from the kiln as a hard
clinker, and finally ground again to a gray powder—the finished cement. The
making of cement is not a simple nor a small scale process—at all stages of its
manufacture it is under close chemical and physical control and a plant to make
it costs at least a million dollars. Yet in hardly any section of the country
does the material cost as much as a cent a pound, and it will set into a hard,
stone-like mass when mixed with a little water and six to eight times its own
weight of sand and gravel. Because cement will stand a lot of abuse, there is a
tendency for users to think of concrete merely as a mixture of cement,
aggregates, and water, and let it go at that. It is the purpose of this little
talk to mention some of the things that are involved in making good concrete
and avoiding poor concrete. It won't interest the technical expert or the large
contractor particularly, but it may hopefully be of some use to the contractor
or builder who doesn't have a large organization and who must depend upon his
own knowledge and experience to plan and execute the work he undertakes. Of all
the concrete troubles that can be traced to materials, the great majority are
usually related in some way to poor sand. This matter of sand is so important
that it is hard to understand the general indifference among concrete men
regarding this particular material. Fortunately for our purpose here, it is
easier to specify what a sand should not be than exactly what it should be, and
we believe that the simple tests described on this web site, which every
contractor can use to his great advantage, will serve either as a safeguard
against bad sand or as a warning against questionable sand.
Sand
may be unsuitable in three respects:
1.
It may be too fine or otherwise poorly graded.
2.
It may contain dangerous organic matter.
The
gradation of sand is perhaps its most important characteristic in relation to
its concrete- making value. The usual limits for fine and coarse sands are
described and illustrated on pages 103 to 105 of this book. A simple
recommended test which any one can make to judge the gradation of sand is as
follows: Sift a handful of the dry sand on a No. 30 sieve. If the sand is
first-class concrete sand, this sieve will divide it into, roughly, equal parts,
the larger fraction being retained on the sieve. If most of the sand passes
through the sieve, it is too fine, and if nearly all is retained on the sieve,
it is too coarse. A No. 4 sieve can also be used to advantage in case the sand
contains any appreciable amount
of gravel, or in case pit-run material is being tested. It is customary
nowadays to designate sand particles coarser than a No. 4 sieve as gravel, and
the No. 30 sieve should be used on the sand after the gravel has been removed.
While
the gradation of concrete sand was said to be its most important
characteristic, the presence of organic compounds may be a very serious matter
in extreme cases. This is a contamination which comes from the slow leaching of
water through decomposed overlying vegetable matter, which results in coating
the sand grains with an invisible trace of a substance that may interfere
seriously with the proper setting of the cement.
Are You in Chestnut Hill Massachusetts? Do You
Need Concrete Cutting?
Call 800-799-9151
We Service Chestnut
Hill MA and all surrounding Cities & Towns
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