Concrete Cutting Core Drilling Dayton ME Maine

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

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In general fine aggregate will produce a comparatively smooth surface of uniform color while coarser aggregates will give greater irregularity in both surfaces and color, producing a somewhat rustic appearance. One of the chief advantages of finishing surfaces by brushing is the adaptability of this process to every class of concrete construction. Park benches, lawn vases, lamp-posts and statuary of all kinds may be finished by this process as easily as buildings. Where it is desired to leave a smooth surface in the shape produced by the forms, but to obtain a more finished surface than possible by washing with a float under which sand is used for cutting, the concrete may be finished, when it is at an age of from 1 to 2 days, by removing the form and rubbing the surface with a brick and sand, natural stone, emery, or carbon. Where it is desired to finish concrete in this manner the large pieces of aggregate should he spaded back from the forms so that the face will contain little or no coarse aggregate. If a mottled surface is desired it may be produced by a mortar composed of 1 part of Portland cement and 2/ parts of white marble or limestone, either of which will rub to a very beautiful surface. While the rubbing is in process a thin grout, composed of 1 part of cement and 1 of sand should be applied and well rubbed in. The work should afterwards be washed down with clear water. When concrete is thoroughly hardened, it may be dressed in the same manner as natural stone, although the stone cutter's tools require slight alterations to suit the need •'of concrete. While this work is sometimes done on concrete when it is 2 or 3 days old, the best results are obtained when it is about 1 month old. The great disadvantage of dressing concrete with a stone hammer at too early an age is that pieces of the aggregate will be knocked out from the cement mortar, leaving unsightly holes, while if left for a few weeks it will become so thoroughly hardened that they will break under the hammer and give a uniform surface much the same as natural stone. For this purpose the best tool is a special form of bush hammer, designed to dress concrete, the points on the face of which are farther apart and larger - than the regular stone cutter's hammer. A three pound hammer with four points is a good size for concrete work, although larger ones are frequently used. Another hammer which has been especially designed for dressing concrete is similar to a pick having five teeth on each end. For finishing large surfaces a pneumatic hammer is used and produces a very uniform finish, doing the work much more rapidly than where the tools are operated by hand. Another finish is obtained by an expensive machine which gives a sand-blast finish. Concrete should never be subjected to sand-blasting until it is at least one month old. A nozzle pressure of from 50 to 80 lbs. should be maintained. For artistic work, the suggestions already made with reference to the selection, gradation and mixing of aggregate will accomplish better results in any process of artificial coloring which may be adopted. The above principles will he applied to the case of a concrete arch having a span of 20 feet and a rise of 3 feet (see Fig. 223). If this concrete arch is to be a circular or segmental concrete arch, the radius which will fulfill these conditions may be computed as illustrated in Fig. 222. We may draw a horizontal line, at some scale, which will represent the span of 20 feet. At the center of this line we may erect a perpendicular which shall be 3 feet long (at the same scale). Joining the points, and bisecting ac at d, we may draw a line from the bisecting point, which is perpendicular to cc, and this must pass through the center of the required arch. A vertical line through the center will also pass through the center there in the required are, the points will and the point o.

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

We Are Your Local Concrete Cutter

Call 207-284-0788

We Service Dayton, ME and all surrounding Cities & Towns