Concrete Cutting Core Drilling Cornish ME Maine

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These processes are: 1, the dry process; 2, the semi-wet process, and 3, the wet process. In the dry process the raw materials are ground, mixed and burned in their original dry state. The wet process consists of mixing the raw materials, of grinding them with water and of feeding them into large rotary kilns in the shape of “slurry" containing enough water to make the whole mass of a fluid consistency. The semi-wet process resembles the wet process except that the slurry contains comparatively little moisture.

The Manufacture of Portland Cement

The manufacture of Portland cement itself is divided into five heads as follows:

1. Mining and quarrying of raw material.

2. Drying and grinding.

3. Proportioning and mixing.

4. Burning the two materials to incipient fusion.

5. Grinding the clinker thus burned to an extremely fine powder, meanwhile adding the proper proportion of gypsum, the resulting powder being known as Portland cement. The excavation of the raw materials is the first step, and this is done by one of three general methods. First, quarrying and digging from open pits. The second is mining from underground workings. The third is dredging from deposits covered by water.

The usual method of quarrying the rocks is similar to that followed in all quarry operations. The rock is dislodged from the quarry face by means of an explosive and then dumped into side dump cars or aerial trams by either steam shovel or manual labor, preferably the former. The stone is then conveyed to the stone house, where it is crushed to comparatively small sizes and then transported to storage bins before, being mixed with other ingredients. While in storage the stone may be sampled and analyzed.

One method of grinding, before being placed in the storage bins, is to pass the limestone, shale; or cement rock through crushers and ball mills, or other preliminary grinders, from which it is conveyed to storage bins. The ball mills are cylindrical steel drums containing a quantity of steel balls. The material to be ground after drying is continuously added. As the cylinder rotates the balls roll, thus grinding the rocks to coarse grit. The coarse grits are then run into storage bins. Tube The concrete contractor should test all this work in Statics by drawing figures very carefully and on a large scale, in accordance with the general instructions as described in the sections, and should purposely make some variation in the relative positions and amounts of the forces from those indicated by the figures. By this means the concrete contractor will be able to obtain a virtual demonstration of the accuracy of the laws of Statics as formulated. The concrete contractor should also remember that the laws are theoretically perfect; and when it is stated, for example, that certain lines should be parallel, or that a certain line drawn in a certain way should intersect some certain point, the mathematical laws involved are perfect; and if the drawing does not result in the expected way, it either proves that a blunder has been made, or it may mean that the general method is correct, but that the drawing is more or less inaccurate. In Fig. 216, have been drawn the same forces A, B, and C, having the same relative positions as in Fig. 215. The lines of action of the two vertical forces R' and R" have also been drawn in the same relative position as in Fig. 215. The point n has also been located on the load line in the same position as in Fig. 215.

Are You in Cornish Maine? Do You Need Concrete Cutting?

We Are Your Local Concrete Cutter

Call 207-284-0788

We Service Cornish, ME and all surrounding Cities & Towns