Hingham

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Concrete Cutting Sawing Hingham MA Mass Massachusetts

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We Service Hingham MA and all surrounding Cities & Towns

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It is said to be patented. The dry concrete mortar method consists of a dry, rich mixture, with finely crushed stone. The concrete is usually composed of 1 part cement, 3 parts sand, and 3 parts crushed stone known at the 3-inch size, and mixed dry so that no concrete mortar will flush to the surface when well rammed in the forms. When placed, the concrete is not spaded next to the forms; and being dry, there is no smooth concrete mortar surface, but there should be an even-grained, rough surface. With the dry mixture, the imprint of joints of the forms is hardly noticed, and the grain of the wood is not seen at all. This style of finish has been extensively used in the South Park system of Chicago, and there has been no efflorescence apparent on the surface, which is explained by "the dryness of the mix and the porosity of the surface." Cast concrete slab veneer can be made of any desired thickness or size. It is set in place like stone veneer, with the remainder of the concrete forming the backing. It is usually cast in wooden moulds, face down. A layer of concrete mortar, 1 part cement, 1 part sand, and 2 or 3 parts fine stone or coarse sand, is placed in the mould to a depth of about 1 inch, and then the mould is filled up with a 1:2:4 concrete. Any steel reinforcement that is desired may be placed in the concrete. Usually, cast concrete slab veneer is cheaper than concrete facing cast in place, and a better surface finish is secured. Concrete is now in demand in ornamental shapes for buildings and bridges. They may be either constructed in place, or molded in sections and placed the same as cut stone. Plain cornices or panels are usually constructed in place, and complicated molding or balusters are usually made in sections and erected in separate pieces.

The moulds may be constructed of wood, metal, or plaster of Paris, or molded in sand. The operation of casting concrete in sand is similar to that of casting iron. The pattern is made of wood the exact size required. It is then molded in flasks exactly as done in casting iron. The ingredients for concrete consist of cement and sand or fine crushed stone; the mixture, with a consistence about that of cream, is poured into the mould with the aid of a funnel and a T-pipe. Generally the casting is left in the sand for three or four days, and, after being taken out of the sand, should harden in the air a week or ten days before being placed. Balusters are very often made in this manner. Concrete finish coloring matters have not been used very extensively in concrete work, except in ornamental work. It has not been very definitely determined what coloring matters are detrimental to concrete. Lampblack (boneblack) has been used more extensively than any other coloring matter. It gives different shades of gray, depending on the amount used. Common lampblack and Venetian red should not be used, as they are apt to run or fade. Dry mineral colors, mixed in proportions of two to ten per cent of the cement, give shades approaching the color used. Red lead should never be used; even one per cent is injurious to the concrete. Variations in the color of cement and character of the sand used will affect the results obtained in using coloring matter.  Special paints are made for painting concrete surfaces. Ordinary paints, as a general rule, are not satisfactory. Before the paint is applied, the surface of the concrete wall should be washed with dilute sulfuric acid, 1 part acid to 100 parts water. Concrete floors in manufacturing buildings are often finished with a 1-inch coat of cement and sand, which is usually mixed in the proportions of 1 part cement to 1 part sand, or 1 part cement to 2 parts sand. This finishing coat must be put on before the concrete base sets, or it will break up and shell off, unless it is made very thick, 1 to 2 inches. A more satisfactory method of finishing such concrete floors is to put 2 inches of cinder concrete on the concrete base, and then put the finishing coat on the cinder concrete.

Are You in Hingham Massachusetts? Do You Need Concrete Cutting?

We Are Your Local Concrete Cutter

Call 781-519-2456

We Service Hingham MA and all surrounding Cities & Towns