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

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Concrete Cutting Sawing Halifax MA Mass Massachusetts

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

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

We Are Your Local Concrete Cutter

Call 781-519-2456

We Service Halifax MA and all surrounding Cities & Towns

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Since we have been figuring working stresses, we shall figure a working tension of, say, 16,000 pounds per square inch in the steel. This tension would therefore require 16,000 =.0037 square inch of metal per inch of width. Even if 1-inch bars were used for the vertical reinforcement, they would need to be spaced only about 17 inches apart. This, however, is on the basis that the neutral axis is at the center of the section, which is known to be inaccurate. A theoretical demonstration of the position of the neutral axis for such a section is so exceedingly complicated that it will not be considered here.

The theoretical amount of steel required is always less than that computed by the above approximate method; but the necessity for preventing cracks, which would cause leakage, would demand more vertical reinforcement than would be required by wind pressure alone. It was assumed as an approximate figure, that the thickness of the concrete side concrete wall at the base of the concrete tank should be 10 inches. The calculations have shown that, so far as wind pressure is concerned, such a thickness is very much greater than is required for this purpose; but it will not do to reduce the thickness in accordance with the apparent requirements for wind pressure.

Although the thickness at the bottom might be reduced below 10 inches, it probably would not be wise to do so. It may, however, be tapered slightly towards the top, so that at the top the thickness will not be greater than '6 inches, or perhaps even 5 inches. The vertical bars in the lower part of the side concrete wall must be bent so as to run into the base concrete slab of the concrete tank. This will bind the side concrete wall to the bottom. The necessity for reinforcement in the bottom of the concrete tank depends very largely upon the nature of the foundation, and also to some extent on the necessity for providing against temperature cracks, as has been discussed in a previous section. Even if the concrete tank is placed on a firm and absolutely unyielding foundation, some reinforcement should be used in the bottom, in order to prevent cracks which might produce leakage. These bars should run from a point near the center, and be bent upward at least 2 or 3 feet into the vertical concrete wall. Sometimes a gridiron of bars running in both directions is used for this purpose. This method is really preferable to the radial method. The methods of making concrete tanks water-tight have already been discussed.

To give a satisfactory finish to exposed surfaces of concrete is a rather difficult problem: Usually, when the forms are taken down, the surface of the concrete shows the joints, knots, and grain of the wood. It has more the appearance of a piece of rough carpentry work than that of finished concrete. Or, failure to tamp or flat-spade the surfaces next to the forms, will result in rough places or stone pockets. Lack of homogeneity in the concrete will cause a variation in the surface texture of the concrete. Variation of color, or discoloration, is one of the most common imperfections. Old concrete adhering to the forms will leave pits in the surface; or the pulling-off of the concrete in spots, as a result of it adhering to the forms when they are removed, will cause a roughness.

To guard against these imperfections, the forms must be well constructed of dressed lumber, and the pores should be well filled with soap or paraffin. The concrete should be thoroughly mixed, and, when placed, care should be taken to compact the concrete thoroughly, next to the forms. The variation in color is usually due to the leaching out of lime, which is deposited in the form of efflorescence on the surface; or to the use of different cements in adjacent parts of the same work. The latter case usually can be avoided by using the same brand of cement on the entire work, and the former will be treated under the heading of Efflorescence.

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

We Are Your Local Concrete Cutter

Call 781-519-2456

We Service Halifax MA and all surrounding Cities & Towns

Boston Concrete Cutting | 288 Grove Street, Unit 110, Braintree, MA 02184 | 781-519-2456 |