Concrete Cutting Cutter Bolton MA Mass Massachusetts

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Concrete is a compound of gravel, broken rock or other aggregate, bound together by means of hydraulic cement, coal tar, asphaltic, or other cementing materials. Generally when a qualifying term is not used Portland cement concrete is understood." In order to secure satisfactory concrete it is usually necessary to separate the aggregates into two portions by size; hence the Joint Committee definition: "a mixture of Portland cement, fine aggregate, coarse aggregate and water." The 1924 report deals only with Portland cement concrete. Plain concrete, being brittle and weak in tension, is suitable only for relatively massive members subject to compression Combination structural members made of concrete reinforced by steel bars, placed so as to carry the tensile stresses, are sturdy and reliable. The name reinforced concrete cannot be applied to a combination piece of steel and concrete unless both materials assist in carrying the load and the whole acts as a unit. Of the three fundamental types of structural members, beams, columns, and ties, only beams and columns can ever be said to be of reinforced concrete. The advantages of reinforced concrete as a structural material are evident, each element making up for the deficiencies of the other, the steel supplying the tensile strength and toughness and the concrete supplying the compressive strength besides protecting the steel from corrosion and from fire. Portland Cement. The usual description of Portland cement is the product obtained by finely pulverizing clinker produced by calcimine to incipient fusion an intimate and properly proportioned mixture of argillaceous and calcareous materials with no additions subsequent to calcinations except water and calcite or unclaimed gypsum. It differs from natural cement (" the finely pulverized product resulting from the calcinations of an argillaceous limestone at a temperature sufficient only to drive off the carbonic acid gas ") in being slower setting, much stronger, more uniform and reliable. Portland cement is to a very considerable degree a standardized article of commerce and practically all brands can be depended upon to satisfy the standard tests. It is customary, however, on all work of importance to submit the cement to test. Alumina Cements. The new high-alumina cements are made by reducing to a powder a fused mixture of bauxite (aluminum ore) and limestone. Concrete made with these cements sets, that is, changes from a plastic to a stiff state, in about the same time as Portland cement concrete and then proceeds to harden and gain in strength very rapidly, attaining in 24 hours a compressive strength equal to or greater than that gained by Portland cement concrete in 28 days. This 24-hour strength is, approximately, 75 percent of that reached at 28 days. This rapid gain in strength is accompanied by a considerable development of heat, sufficient to protect the mass from freezing until high strength is attained under weather conditions which would entirely prevent Portland cement from setting or hardening. Another important advantage, that which led to �the development of this cement in France, is that concrete made with alumina cement apparently resists the action of sea water and alkalis which often disintegrate Portland cement concrete. It is probable that the limited supplies of raw material suitable for making high alumina cements will always keep their cost in North America far above that of Portland cement. Consequently, they will be used only for a limited class of work where their high strength and quick hardening justify the increased expenditure. At present there is no reason to believe they will ever replace Portland cement for ordinary construction.