Concrete Cutting Cutter Wayland MA Mass Massachusetts

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Wayland Massachusetts Concrete Cutting and Core Drilling

The concrete waterproofing materials for this reservoir consist of 4-ply felt, and compound was used to cement the layers together. An illustration of the method used by the Barrett Manufacturing Company in applying their 5-ply coal-tar pitch and felt roofing material, and it shows, in a general way the method of laying asphalt and felt for concrete waterproofing concrete purposes. The company's instructions for applying this roofing are as follows: First coat the concrete with hot pitch mopped on uniformly. Over the above coating of pitch, lay two thicknesses of tarred felt, lapping each sheet seventeen inches over the preceding one and mopping back with pitch the full width of each lap. Over the felt thus laid, spread a uniform coating of pitch mopped on. Then you must lay three full thicknesses of tarred felt, lapping each sheet twenty-two (22) inches over the preceding one. "When the felt is thus laid, mop back with pitch the full width of twenty two inches under each lap. Then spread over the entire concrete surface of the roof a uniform coating of pitch, into which, while hot, imbed slag or gravel.

�In applying asphalt and felt for general concrete waterproofing purposes, the felt, as already stated, would be in a continuous roll, and not in sheets as shown for roofing purposes. Among the many patented concrete waterproofing materials on the market is the "Medusa." This compound is claimed to prevent efflorescence, as well as to make concrete waterproof. In using it, the following directions, given by the manufacturing company, are to be observed: "To render cement work impervious to water, a small quantity of the compound is thoroughly mixed with the dry cement, before the addition of sand and water. For most purposes from 1 to 2 percent of the weight of cement used will be found sufficient. This is equivalent to from four to eight pounds of the compound to one barrel of cement. The precise amount to be used must be left to the experience of the user, and depends upon the proportion of sand, etc., employed, and on the kind of work to be done.

Our own experience has been that the use of 1 percent-4 pounds to the barrel, or 1 pound to the sack of cement�is enough to make hollow concrete building blocks water-tight. For cistern and reservoir linings and other work which must be absolutely impervious, a somewhat larger amount should be used. Thorough mixing is of the utmost importance." In the operation of concrete waterproofing, a very common mistake is made in applying the concrete waterproofing materials on the wrong side of the wall to be made water-tight. That is, if water finds its way through a cellar wall, it is generally useless to apply a concrete waterproofing coat on the inside surface of the wall, as the pressure of the water will push it off. If, however, there is no great pressure behind it, a concrete waterproofing coat applied on the inside of the wall is usually successful in keeping moisture out of the cellar. To be successful in concrete waterproofing a cellar wall, the concrete waterproofing material should be applied on the outside surface of the wall; and if properly applied, the wall, as well as the cellar, will be entirely free of water. In tank or reservoir construction, the conditions are different, in that it is desired to prevent the escape of water. In these cases, therefore, the concrete waterproofing is applied on the inside surface, and is supported by the materials used in constructing the tank or reservoir.

The structure should always be designed so that it can be properly waterproofed, and no asphaltic concrete waterproofing should be laid at a temperature below 25� F. The above-described methods of concrete waterproofing are applicable to stone and brick masonry as well as to concrete. One of the groups of mineral substances composed of different hydro-carbons, which are widely scattered throughout the world, is known as bitumen.