Boston Concrete Cutting
288 Grove Street, Unit 110
Braintree, MA 02184


781-519-2456
info@bostonconcretecutting.com
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Concrete Cutting Sawing Kingston MA Mass Massachusetts

Welcome

“We Specialize in Cutting Doorways and Windows in Concrete Foundations”

Are You in Kingston Massachusetts? Do You Need Concrete Cutting?

We Are Your Local Concrete Cutter

Call 781-519-2456

We Service Kingston MA and all surrounding Cities & Towns

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In purchasing a new plant, care must be exercised in selecting machinery that will not only be satisfactory for the first job, but that will fulfill the general needs of the purchaser on other work. All parts of the plant, as well as all parts of any one machine, should be easily duplicated from stock, so that there will not be any great delay from any breakdown or worn-out parts. The design of a plant for handling the material and concrete, and the selection of a concrete mixer, depend upon local conditions, the amount of concrete to be mixed per day, and the total amount required on the contract. It is very evident that on large jobs it pays to invest a large sun in machinery to reduce the number of men and horses; but if not over 50 cubic yards are to be deposited per day, the cost of the machinery is a big item, and hand labor is generally cheaper. The interest on the plant must be charged against the number of cubic yards of concrete; that is, the interest on the plant for a year must be charged to the number of cubic yards of concrete laid in a year.

The depreciation of the plant is followed by taking the cost of the entire plant when new, and then appraising it after the contract is finished, and dividing the difference by the total cubic yards of concrete laid. This will give the depreciation per cubic yard of concrete manufactured. The best concrete mixer is the one that turns out the maximum of thoroughly mixed concrete at the minimum of cost for power, interest, and maintenance. The type of concrete mixer with a complicated motion gives better and quicker results than one with a simpler motion. There are two general classes of concrete mixers continuous concrete mixers and batch concrete mixers. A continuous concrete mixer is -one into which the materials are fed constantly, and from which the concrete is discharged constantly. Batch concrete mixers are constructed to receive the cement with its proportionate amount of sand and stone, all at one charge; and, when mixed, it is discharged in a mass. No very distinct line can be drawn between these two classes, for many of these concrete mixers are adapted to either continuous or batch mixing. Generally, batch concrete mixers are preferred, as it is a very difficult matter to feed the concrete mixers uniformly unless the materials are mechanically measured. Continuous concrete mixers usually consist of a long screw or pug mill that pushes the materials along a drum until they are discharged in a continuous stream of concrete.

Where the concrete mixers are fed with automatic measuring devices, the concrete is not regular, as there is no reciprocating motion of the materials. In a paper recently read before the Association of American Portland Cement Manufacturers, S. B. Newberry "For the preparation of concrete for blocks in which thorough mixing and use of an exact and uniform proportion of water are necessary, continuous mixing machines are unsuitable; and batch concrete mixers, in which a measured batch of the material is mixed the required time, and then discharged, are the only type which will be found effective." There are three general types of concrete mixers: gravity concrete mixers, rotary concrete mixers, and paddle concrete mixers. Gravity concrete mixers are the oldest type of concrete mixers.

They require no power, the materials being mixed by striking obstructions which throw them together in their descent though the machine. Their construction is very simple. Fig. 122 illustrates a portable gravity concrete mixer. This concrete mixer, as will be seen from the figure, is a steel trough or chute in which are contained mixing members consisting of pins blades. The concrete mixer is portable, and requires no skilled labor to operate it. There is nothing to get out o order or cause delays. It is adapted for both large and small jobs. Operation of Portable Gravity is usually fed by measure, and Concrete mixer, by this method will produce concrete as fast as the materials can be fed to their respective bins and the mixed concrete can be taken from the discharge end of the device.

Are You in Kingston Massachusetts? Do You Need Concrete Cutting?

We Are Your Local Concrete Cutter

Call 781-519-2456

We Service Kingston MA and all surrounding Cities & Towns

Boston Concrete Cutting | 288 Grove Street, Unit 110, Braintree, MA 02184 | 781-519-2456 | info@bostonconcretecutting.com