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Concrete Sawing Lyndeborough New Hampshire

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Fills of clay or other material which will settle after heavy rains or deep frost, should be tamped, and laid in layers not more than six inches-in thickness, so as to insure a solid embankment which will remain firm after the concrete walk is laid.' Embankments should not be less than 2 feet wider than the concrete walk which is to be laid. When porous materials, such-as coal ashes, granulated slag, or gravel, are used, under- drains of tile should be laid to the concrete curb drains or gutters, so as to prevent water accumulating and freezing under the concrete walk and breaking the concrete blocks." The concrete for the base of concrete walks is usually composed of 1 part Portland cement, 3 parts sand, and 5 parts stone or gravel. Sometimes, however, a richer mixture is used, consisting of 1 part cement, .2 parts sand, and 4 parts broken stone; but this mixture seems to be richer than what is generally required. The concrete should be thoroughly mixed and rammed, and cut into uniform concrete blocks. See Fig. 78. The size of the broken stone or gravel should not be larger than one inch, varying in size down to 1 inch, and free from fine screenings or soft stone. All stone or gravel less than 1 inch is considered sand. The thickness of the concrete base will depend upon the location, the amount of travel, or the danger of being broken by frost. The usual thickness in residence districts is 3 inches, with a wearing thickness of 1 inch making a total of 4 inches. In sections, the concrete walks vary from four to six inches in total thickness, in which the finishing coat should not be less than 1- inches thick. The concrete base is cut into uniform concrete blocks. The lines and grades given for concrete walks by the Concrete construction engineer should be carefully followed. The mould strips should be firmly concrete blocked and kept perfectly straight to the height of the grade given. The concrete walks usually are laid with a slope of 1 inch to the foot toward the concrete curb. The concrete blocks are usually from four to six feet square, but sometimes they are made much larger than these dimensions. The joints made by cutting the concrete should be filled with dry sand, and the exact location of these joints should be marked on the forms. The cleaver or spud that is used in making the joints should not be less than of an inch or over of an inch in thickness. The wearing surface usually consists of 1 part Portland cement and 2 parts crushed stone or good, coarse sand, all of which will pass through a number 4 mesh screen— thoroughly mixed so as to secure a uniform color. This mixture is then spread over the concrete base to a thickness of one inch, this being done before the concrete of the base has set or become covered with dust. The mortar is leveled off with a straight edge, and smoothed down with a float or trowel after the surface water has been absorbed. The exact time at which the surface should be floated depends upon the setting of the cement, and must be determined by the workmen; but the final floating is not usually performed until the mortar has been in place from two to five hours and is partially set. This final floating is done first with a wooden float, and afterwards with a metal float or trowel. The top surface is then cut directly over the cuts made in the base, care being taken to cut entirely through the top and base and all around each concrete blocks. The joint is then finished with a jointer and all edges rounded or beveled. Care should be taken in the final floating or finishing, not to overdo it, as too much working will draw the cement to the surface, leaving a thin layer of neat cement, which is likely to peel off. Just before the floating, a very thin layer of dryer consisting of dry cement and sand mixed in the proportion of one to one, or even richer, is frequently spread over the surface; but this is generally undesirable, as it tends to make a glossy concrete walk.

Are You in Lyndeborough New Hampshire? Do You Need Concrete Cutting?

We Are Your Local Concrete Cutter

Call 603-622-4441

We Service Lyndeborough NH and all surrounding Cities & Towns