Lightweight concrete blocks as a solution to many construction problems.

Despite the trend towards gasification, many parts of the country still use coal as fuel. The product of coal combustion is slag. Many tons of it go to waste. Meanwhile, it is an excellent heat-insulating material used in the manufacture of lightweight concrete blocks. Expanded Clay is widely used in this capacity. But expanded clay is the end product, and slag — waste. Hence the price difference.

As a filler, slag can be used directly. They fill the space between two parallel walls made of bricks. But it is not always and not everywhere possible to use brick as a building material. It is much more convenient to use blocks made directly on the construction site as building material. Anthracite coal slag is used to make blocks.

The slag used for the manufacture of blocks must be aged in the dump for about a year. Before use, it is sorted using a metal mesh — (“grokhotki”), into fractions. Large fraction – from 5 to 40 mm and small. This must be done, given that when using coarse slag, the blocks are lighter, but less durable. Therefore, a mixture of fractions is used in the manufacture of blocks. Usually the ratio is 4 parts small and 6 parts large. Clay or slaked lime is used as a plasticizer.

The mixture is pre-prepared in dry form. Used cement, sand, slag in proportion 1/3/6, respectively. The amount of plasticizer depends on the volume of cement and is 1/5 of it. The amount of water added also depends on this. The prepared slag concrete mixture must be thoroughly mixed. Doing it manually is extremely time consuming. Therefore, to prepare a high-quality mass, a concrete mixer is needed. There are many ways to make it from a suitable container.

The form for blocks is assembled in the form of boxes without a bottom. The cells are assembled from boards and covered from the inside with tin or plastic. In extreme cases, they are painted with nitro enamel. This avoids absorption and makes the molds easier to clean. The dimensions of the blocks depend on the type of walls, specific conditions.

The technology for making blocks requires laying concrete in layers, about 20 cm thick, followed by tamping. The voids in the blocks are provided either with plastic tubes with a diameter of about 50 mm, or simply rolls from old newspapers. It is recommended to keep the completed forms for at least a day.

After the blocks are formed, they are stored under a canopy for 3 weeks. To prevent drying out, the blocks are covered with damp burlap.

If there is a wood processing plant in the area, sawdust is an excellent filler. By analogy with slag concrete, sawdust concrete is obtained.

Of all types of lightweight concrete, sawdust concrete is the most comfortable material for the construction of residential premises. As a filler, sawdust of coniferous trees is best suited. The ratio of sawdust concrete components differs from that of cinder concrete. In terms of the ratio of parts, it looks like this: 1 part cement, 1 part sawdust and up to 3 parts sand.

When preparing the mixture, water is added gradually. A properly prepared mortar, when compressed into a fist, forms a lump without releasing water.

Sawdust concrete sets much longer than cinder concrete. You can remove the form no earlier than 3-4 days have passed. But sawdust concrete gains full strength no earlier than after 3-4 months.

Thus, in the presence of a cheap filler such as slag or sawdust, many problems with the construction of both residential and utility rooms are removed .

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