Concrete Cutting Cutter Holbrook MA Mass Massachusetts

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Holbrook Massachusetts Concrete Cutting and Core Drilling

This powder is fed into long rotary kilns, which are iron tubes about 5 or 6 feet in diameter, lined with fire brick and over 100 feet long. Powdered coal is also fed into the kilns with the ground rock and burned at a temperature of about 3000 degrees Fahrenheit, a temperature higher than that needed to melt iron to a liquid, and there is formed what is called cement clinker, a kind of dark, porous stone which looks like lava. After leaving the kiln, the clinker is cooled, crushed and ground again to a still finer powder, so fine, in fact, that most of the particles are less than 1/200 of an inch in size, and this grinding brings it back to the very light gray color characteristic of Portland Cement. It is now placed in storage tanks or stock houses where it remains for a while to season before it is put into bags or barrels and shipped. The barrels weigh 400 pounds gross, or 376 pounds net. When shipped in bags, the weight is 94 pounds per bag, four bags being equal to one barrel. At the concrete plants, from the time the rock is taken from the quarry until it is packed in barrels or bags, all of the work is done by machinery, and a thorough chemical mixture takes place regulated by the experienced chemists in charge of the work. Portland cement may be obtained in paper bags, cloth sacks or wooden barrels. The most convenient form for most users is the cloth sack. These sacks can be returned, to the dealer from whom the cement was purchased and at rebate obtained for them if they are kept dry and un-torn. Portland cement must be stored in a dry place, that is, in a barn or shed, for dampness is the only element which will injure its quality. The cement - will become lumpy and even form a solid mass when kept in a damp place, and when in this condition it should not be used. All lumps which do not crumble at the lightest blow should be thrown out. Cement stored in a building must not be placed on the bare ground. Make a platform which is at least 6 inches above the ground, and store the cement on this platform. If the building has a concrete floor it is advisable to cover the floor with planking upon which to place the cement. Sand, crushed stone or gravel screenings passing when dry�� SAND a screen having '/4-inch diameter holes is called the fine aggregate. Sand should be clean, that is, free from dirt like vegetable loam, and coarse. If the sand contains vegetable matter, it is difficult to tell whether the sand is good, because a very small quantity a fraction of one percent may sometimes prevent the concrete from hardening. When the job is small, however, an approximate idea of the quality may be obtained by examining the sand in the bank and making up a specimen of concrete on the job as described below. The ordinary plan of taking a little sand in the palm of one hand and rubbing it with the fingers of the other to see if it discolors is of little value, and little can be learned from dropping sand in water, because it is not so much the quantity as the kind of impurity that counts. Two rough tests are as follows: (a) Pick up a double handful of moist sand from the bank, open the hands, holding them with the thumbs up, and rub the sand lightly between the hands, keeping them about 2/2� inch apart, allowing the sand to slip quickly between them. Repeat this operation five or six times, then rub the hands lightly together so as to remove the fine grains of sand which adhere to them, and examine to see whether or not a thin film of sticky matter adheres to the fingers; if so, do not use the sand, for it contains loam. A further test is to scrape some of this matter from the fingers on the end of a penknife and take a little of it between the teeth. If it does not feel gritty or sharp it indicates vegetable loam, which is bad. Do not use this sand, or if no other can be obtained test it further to make sure that there is not sufficient loam present to prevent the cement from getting thoroughly hard. The sand for the test given above must be moist, just as it comes from the bank. When dry the dirt will not stick to the fingers, hence this test cannot be used.