Concrete Cutting Cutter Maynard MA Mass Massachusetts

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Maynard Massachusetts Concrete Cutting and Core Drilling

On the same day, as soon as the concrete has set, remove crosswise and center scantlings, place a sheet of tar paper on the edges to separate them from all other squares and fill in the spaces thus left with 3-inch concrete as before. Mark the scantling to show where the joints come. The finishing coat should be i inch thick, of one part Portland cement and one and one-half parts clean, coarse sand, or crushed stone screenings. This coat should be spread on before the concrete has taken its set, and smoothed off with a screed or straight edge run over the 2 x 4 scantlings, the object being to thoroughly bond the finishing coat to the concrete base. If the bond between the finishing coat and the concrete is imperfect, the walk gives a hollow sound under the feet, and is liable to crack after having been down 75 one or two years. Smooth with a wooden float, and groove exactly over the joints between the concrete (Fig. 24), so as to bevel the edges of all blocks. Do not trowel the finishing coat too much, nor until it has begun to stiffen, as this tends to separate the cement from the sand, do producing hair cracks, and giving a poor wearing surface. Keep the finished walks protected from dust, dirt, currents of air and the hot sun during the process of setting, and further protect from the sun and traffic for three or four days, and keep moist by sprinkling. The covering may be whatever is most convenient�sand, straw, sawdust, grass, or boards.

Most walks are made the width of a single block, and should be constructed as shown in Fig. 24. In a walk the width of a single block, make every alternate block and then go back and fill in the blocks between. The foundation for curbs and gutters, like sidewalks, should be governed by the soil and climate. Concrete curbing should be built in advance of the walk in sectional pieces 6 feet to 8 feet long, and separated from each other and from the walk by tar paper or a cut joint, in the same manner as the walk is divided into blocks. Curbs should be 4 inches to 7 inches wide at the top and 5 inches to 8 inches at the bottom, with a face 6 inches to ' inches above the gutter. The curb should stand on a concrete base 5 inches to 8 inches thick, which in turn should have a sub-base of porous material at least 12 inches thick. The gutter should be 16 inches to 20 inches broad, and 6 inches to 9 inches thick, and should also have a porous foundation at least 12 inches thick. Keeping the above dimensions in mind, excavate a trench the combined width of the gutter and curb and put in the sub-base of porous material. On top of this place forms and fill with a layer of concrete, one part Portland Cement, three parts clean, coarse sand and six parts broken stone, thick enough to fill the forms to about 3 inches below the street level. As soon as the concrete is sufficiently set to withstand pressure, place forms for the curb, and, after carefully cleaning the concrete between the forms and thoroughly wetting, fill with concrete, one part Portland Cement, two and one-half parts clean, coarse sand and five parts broken stone. When the curb has sufficiently set to withstand its own weight without bulging, remove the 3/4-inch board shown, and with the aid of a trowel fill in the space between the concrete and the form with cement mortar, one part granulated Portland cement and part clean coarse sand. The finishing coat at the top of the curb should be put on at the same time. Trowel thoroughly and smooth with a wooden float, removing face form the following day. Sprinkle often and protect from sun. In making curbs alone, specifications given below and illustrated in sectional drawing should be followed. Excavate 32 inches below the level of the curb and fill with cinders, broken stone, gravel or broken brick to depth of 12 inches. Build a foundation 8 inches deep by 12 inches broad, one part granulated Portland Cement, three parts clean, coarse sand and six parts broken stone, and from the top of this and nearly flush with the rear, build a concrete wall 111/4 inches high, 7'/4 inches broad at the base and 61/4 inches at the top, the 1-inch slope to be on the face.