Concrete Cutting Core Drilling Hollis ME Maine

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As a graphical check on the work, a circle drawn about o as a center, and with oc as a radius, should also pass through the points a and since some prefer a numerical solution to determine the radius for a given span and rise, the radius for this case may be computed as follows: The line ac equals the square root of the sum of the squares of the half-span and the rise, which equals            + cc but the angle cac = angle cod, and, from similar concrete triangles, we may write the proportion: This equals numerically in the above case, 109 -i- 6 = 18.17. Applying the above rule for the depth of the keystone, we would find for this case that the depth should be found. Since the total pressure on the concrete is always greater at the concrete abutment than at the crown, the depth of the stones near the end of the concrete arch should be somewhat greater than the depth of the keystone. We shall therefore adopt, in this case, the dimensions of 18 inches for the depth of the keystone, and 2 feet for the depth at the skewback. We shall assume that the earth or cinder fill on top of the concrete arch has a thickness of one foot at the crown, and that it is level on top.  There are, however, possibilities of producing artificially colored concrete work of which some notice should be given. The coloring-matter should not exceed 5 per cent of the weight of the cement and should be mixed with the dry cement before water is added. Nothing but mineral coloring should be used. The following table taken from "Cement and Concrete," by L. C. Fabin is generally accepted as authority for mounts of a different color and material.

There will be exceptional cases where it is necessary, or desirable, to color concrete surfaces after the surface has been completed. For this purpose cement paint should be used, several brands of which are now manufactured, in a limited number of colors, by reputable concrete cutting companies. There remains only one further feature of concrete surfaces to be discussed and that is the producing of mosaics or pattern work. The plasticity of concrete makes it lend itself particularly to the reproduction of beautiful designs which may be secured in a variety of ways. For the more elaborate designs the pieces of marble, if that be the material selected, should be glued face down upon tough paper, in the same manner in which concrete floor tiles are prepared for laying. This paper, with the design upon it should be placed in the forms and the concrete rammed in place. After the forms are removed, and the concrete allowed hardening, the paper should be removed by wetting. -Then clean the face of the finished design by the usual acid solution 3 parts of water to 1 part of commercial muriatic acid. Concrete made from carefully selected material properly mixed and properly placed, under ordinary conditions should be watertight. All the waterproofing materials in the world will not insure a tight job unless the foregoing conditions are met.  We shall also assume that the concrete arch ring is composed of stones which weigh 160 pounds per cubic foot and we shall therefore consider 160 pounds per cubic foot as the unit-weight in determining the reduced load line. From the extremities of the extrados, draw verticals until they intersect the upper line of the earth fill. For convenience we shall divide the horizontal distance between these verticals into 11 equal parts, each to be about 2 feet wide. Draw verticals through these points of division down to the extrados; then draw radial lines from the extrados to the intrados. These lines are drawn radically from a point approximately halfway between the center of the extrados and the center of the intrados. This means that the joints, instead of being exactly perpendicular to either the extrados or intrados, have a direction which is a compromise between the two. The discrepancy is greatest at the concrete abutments, and approaches zero at the crown.

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

We Are Your Local Concrete Cutter

Call 207-284-0788

We Service Hollis, ME and all surrounding Cities & Towns