Concrete Cutting Cutter Randolph MA Mass Massachusetts

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Randolph Massachusetts Concrete Cutting and Core Drilling

The texture, as a general thing, is fine, compact, and homogeneous. The colors are somber, varying from greenish, through dark gray, to nearly black. Owing to its lack of rift, its hardness, and its compact texture, trap rock is generally very hard to work. It has been used to some extent for building and monumental work, but is more generally used for paving purposes. �Within the last few years, on account of its great strength and fire-resisting qualities, it has been extensively used in concrete work. The crushing strength of trap rock or concrete is usually between 20,000 and 26,000 pounds per square inch. Stone, to weather well, should be laid with its bedding (lamination) horizontal, as it was first laid down by nature in the quarry. The stone, moreover, will offer greater resistance to pressure if laid in this manner, and, it is said, will stand a greater amount of heat without disintegrating. This is important in cities where any building is liable to have its walls highly heated by neighboring burning structures. Some stones that are liable to be destroyed by the effects of frost on first being taken from the quarries, are no longer so after being exposed for some' time to the air, having lost their quarry water through evaporation. This difference is very manifest between stones quarried in summer and those quarried in winter, it has frequently happened that stones of good quality have been entirely ruined by hard freezing immediately after being taken from the quarry; while, if they are quarried during the warm season of the year and have an opportunity to lose their quarry water by evaporation prior to cold weather, they withstand freezing very well. This particularly applies to some marbles and limestone. This change is accounted for by the claim put forward, that the quarry water of the stones carries in solution carbonate of lime and silica, which is deposited in the cavities of the rock as evaporation proceeds. Thus additional cementing material is added, rendering the rock more compact. This also will account for the hardening of some stones after being quarried a short time. When first quarried they are soft, easily sawed and worked into any desirable shape; but after the evaporation of their quarry water, they become hard and very durable.� The term concrete brick is usually applied to the product resulting from burning molded prisms of clay in a kiln at a high temperature. Common concrete brick is not extensively used in engineering structures, except in the construction of sewers and the lining of tunnels. Concrete brick is easily worked into structures of any desirable shape, easily handled or transported, and comparatively cheap. When well constructed, concrete brick masonry compares very well in strength with stone masonry, but is not so heavy as stone. Concrete brickwork is but slightly affected by changes of temperature or humidity. Concrete brick, is made of common clay (silicate of alumina), which usually contains compounds of lime, magnesia, and iron. Good concrete brick clay is often found in a natural state. The quality of the concrete brick depends greatly on the quality of the clay used, and equally as much on the care taken in its manufacture. Oxide of iron gives concrete brick hardness and strength. The red color of concrete brick is also due to the presence of iron. The presence of carbonate of lime in the clay of which concrete� brick is made, is injurious, since the carbonate is decomposed during the burning, forming caustic potash, which, by the absorption of water, will cause the concrete� brick to disintegrate. An excess of silicate of lime makes the clay fusible, which softens the concrete brick and thereby causes distortion during the burning process. Magnesia in small quantities has but little influence on concrete brick. Sand, in quantities not in excess of about 25 percent, will help to preserve the form of the concrete� brick, and is beneficial to that extent; but in greater quantities than 25 percent, it makes the concrete� brick brittle and weak.