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Haverhill Massachusetts Concrete Cutting and Core Drilling

Wonderful as the development of the general industry has been, the growth of the Atlas Portland Cement Company's plants has been even more so. Beginning in 1892 at Coplay, Pa., with the modest capacity of 250 barrels per day, its production has steadily increased through the construction of plants Nos. 2, 3, and 4, at Northampton, Pa,, and plants Nos. 5 and 6, at Hannibal, Mo., until now the productive capacity is more than 40,000 barrels each twenty-four hours, or approximately fourteen million barrels per year. This production is greater than the capacity of any other Portland cement company in the world. Portland cement is manufactured from the finest raw materials, under expert supervision in every department of the works. It is of the highest quality, being guaranteed to pass all usual and customary specifications, such as the specifications of the United States Government and those of the American Society for Testing Materials, which latter specifications have been concurred in by The American Institute of Architects, The American Engineering and Maintenance of Way Association, and The Association of American Portland Cement Manufacturers. The quality of eastern and western granulated is identical. By virtue of its enormous production, The Atlas Portland Cement Company is able to develop and retain in its service the most skilled operating talent in the Portland cement industry, which insures a thoroughly reliable and uniform product. Portland cement is guaranteed to be "ALWAYS UNIFORM Concrete,� which is really an artificial stone, is made by mixing pieces of stone, such as broken granite or hard limestone, which may vary in size from a walnut to a hen's egg, with clean, coarse sand and first-class Portland cement, using enough water to make a mushy mixture about like heavy cream. The cement and water make the mass begin to stiffen in about half an hour, and in from to 24 hours it becomes hard enough so that an impression cannot readily be made by pressing on it with the thumb. In a month's time the entire mass becomes one hard stone. Conglomerate or pudding stone in nature is really natural cement concrete, the large and small particles of pieces of stone and sand being cemented together in the course of ages in a similar way to that by which cement is made. Where a very strong mortar is required for laying brick or stone, Portland cement may be mixed with sand in proportions one part Portland cement to two and one-half parts sand. A characteristic of Portland cement is that it gives an especially greasy mortar. A mortar nearly as strong as the above, and which works still better under the trowel, can be made by mixing one bag Portland cement with one barrel of clean sand and one-half pail of lime putty. The lime putty is made by thoroughly slaking quick lime. The longer the time the putty can stand before using the better it is. It must never be used when hot or until the lime is thoroughly slaked. When laying up brick and stone with any kind of mortar they must be thoroughly wet. Always use the best Portland cement obtainable. Natural cement is not suitable for concrete. Whatever the kind of cement, unless it is of first-class quality, it may give trouble by not setting up and hardening properly. Portland cement is manufactured from a mixture of two materials, one of them a rock like limestone, or a softer material like chalk, which is nearly pure lime, and another material like shale, which is a hardened clay or else clay itself. In other words, there must be one material which is largely lime and another material which is largely clay, and these two be mixed in very exact proportions determined by chemical tests, the proportions of the two being changed every few hours, if necessary, to allow for the variation in the chemical composition of the materials. PORTLAND CEMENT then is made by quarrying each of these two materials, crushing them separately, mixing them in the exact proportions, and grinding them to a very fine powder.