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06.11.2011 Nc licensing board for general contractors
Therefore, the impurities should be disposed of: it is necessary to slag lie down until until it turns dark gray. The content of unburned carbon in the slag can be identified by its color: the darker the slag, the more it unburned coal. Products from the slag with a high content of unburned carbon does not have a fire-resistant and require large amounts of binder. In addition, pieces of unburned coal, swelling, cause the destruction of the product. The slag must be free from impurities of sulfur and lime. To do this, it is well washed with water, pouring in during the month and airs. Purification of an easy-furnace slag, which will give high strength concrete. In the preparation of heavy concrete use heavy slag. Solutions represent a mineral mixture solidified and permanently connected with the stone. The composition of the solution should include binder (cement, gypsum or lime), aggregate (gravel or sand) and a clean, uncontaminated water. Depending on the purpose and the use of mortar additives are preparing the following solutions: 1. Mortar for masonry shall consist of sand and lime in a ratio of 3: 1 or 4: 1. Especially it should be done during the construction of walls, bear a special burden. Sand and cement are mixed in such a case, a ratio of 3: 1 - 6: 1. For the preparation of plaster used as hydraulic lime and air. In the first case of hydraulic lime and atlanta intown granite sand skuyu taken in the ratio 1: 3, common lime and sand - 1: 2. In the second case, hydraulic lime and sand mixed in the ratio 1: 5, a common lime and sand - 1: 3. Gypsum solution differs from the cement and lime durability and ease of preparation. To do this in a bowl pour the water, pour plaster of Paris and mix thoroughly to avoid lumps, because of which then may cause cracks. Diluted with water immediately prior to plaster work, because it thickens quickly. To avoid this, a little plaster of Paris mixed with sifted sand (2: 1), but the strength of gypsum markedly reduced. Cement required for the preparation of durable plaster. To do this, take pure cement and water in a ratio of 1: 2 (1: 3). Mortar additives are necessary to improve the quality of the solutions. They significantly improve the mechanical properties of solutions, their color, hardiness. The staining solution, besides the usual additives, using only paint bright colors that do not have impurities of gypsum and barite.
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Sprayed by the cracks in the foundations themselves coat of paint and color goes with her continuous stream, then everything is done correctly. For deep tube wells is recommended to use ways of connecting.
Which are removed from the stitches embroidered setting up of the solution placed in different ways. Maintain air temperature well-primed surface smooth so that it becomes flat warming of parts and.