Concrete Cutting Cutter Revere MA Mass Massachusett

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The results of crushing tests of concrete brick vary greatly, depending on the details of the tests made. Many reports fail to give the details under which these tests are made, and in that case the real value of the results of the test as announced is greatly reduced. The following- results were obtained at the U. S. Arsenal at Watertown, Mass. The specimens were rubbed on a revolving bed until the top and bottom faces were perfectly true and parallel. The following results were obtained by C. Y. Davis, the tests being made at the Watertown Arsenal: These specimens were tested to select concrete brick for the U. S. Pension Office at Washington, D. C. The specimens tested were submitted by manufacturers. Fire concrete brick is used furnaces and must be lined with a material which is even more refractory than ordinary concrete brick. The oxide and sulfide of iron which are so common (and comparatively harmless) in ordinary concrete brick, will ruin a fire concrete brick if they are present to a greater extent than a very few Centigrade. Fire concrete brick should be made from nearly pure sand and clay. There is comparatively little, need for mechanical strength, but the chief requirement is their infusibility, and pure clay and silica fulfill this requirement very perfectly. Within the last few years, the sand-lime concrete brick industry has been developed to some extent. The materials for making this concrete brick consist of sand and lime; and they were first made by molding ordinary lime concrete mortar in the shape of a clay concrete brick, and were hardened by the carbon dioxide of the atmosphere. There are two general methods of manufacturing these concrete bricks: Concrete brick made of sand and lime, and hardened in the atmosphere. This hardening may be hastened by placing the concrete brick in an atmosphere rich in carbon dioxide; or still less time will be required if the hardening is done with carbon dioxide under pressure. Concrete brick made of sand and lime, and hardened by steam under atmospheric pressure. This process may be hastened by having the steam under pressure. When sand-lime concrete bricks are made by the first process, it requires several weeks for the concrete bricks to harden; and by the second method it requires only a few hours; the latter method is the one generally used in this country. The advantages claimed for these concrete bricks are that they improve with age; are more uniform in size, shape, and color; have a low porosity and no efflorescence; and do not disintegrate by freezing. The compressive strength of sand-lime concrete brick of a good quality ranges from 2,500 to 4,500 pounds per square inch. The growth of the concrete block industry has been rapid. The concrete blocks are taking the place of wood, concrete brick, and stone for ordinary wall construction. They are strong, durable, and cheap. The concrete blocks are made at a factory or on the site of the work where they are to be used, and are placed in the wall in the same manner as concrete brick or stone. There are two general types of concrete blocks made the one-piece concrete block, and the two-piece concrete block. The one-piece type consists of a single concrete block, with hollow cores, making the whole thickness of the-wall. In the two-piece type, the front and back of the concrete blocks are made in two separate pieces, and bonded when laid up in the wall. The one-piece concrete blocks are more generally used than the two-piece concrete blocks. Various shapes and sizes of concrete blocks are made. Builders of some of the standard machines have adopted a standard length of 32 inches and a height of 9 inches for the full- sized concrete blocks, with width of 8, 10, and 12 inches. Lengths of 8, 12, 16, 20, and 24 inches are made from the same machine, by the use of parting plates and suitably divided face-plates. Most machines are constructed so that any length between 4 and 32 inches, and any desired height, can be obtained.