SU1470506A1 - Method of producing construction materials from soil - Google Patents

Abstract

The invention relates to the manufacture of building products, mainly soil blocks, capable of maintaining water resistance for a long time, and can be used in the construction of the foundations of buildings and structures, the lower layers of roads. The purpose of the invention is to improve the physical and mechanical properties of materials. The natural soil with a moisture content of 2–20% is fed into the mold and is pressed in 2 stages. At the first stage, they are pressed under a pressure of 1–2 MPa, then the mineral is applied to the surface of the block obtained. At the second stage, a pressure is applied at a pressure of 6–8 MPa, after which a hydrophobic liquid is applied to the molded block. 1 tab.

Description

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The invention relates to the manufacture of building products, mainly: soil blocks, capable of maintaining water resistance for a long time, and can be used in the construction of foundations of buildings and structures, the lower layers of roads.

The purpose of the invention is to increase the physicomechanical properties of materials.

According to the proposed method, a natural soil with a moisture content of 2–20% is fed by an intake device into a mold, where it is pressed in the form of a regular shape, for example, in a cube or parallelepiped void under a pressure of 1-2 Sha until the product has a compressive strength of 0.15-0.2 MPa. Then, a layer of water-absorbing mineral material (spfc, lime, cement) is sprayed or coated onto the surface of the obtained product. After that, the product is placed in a mold and subjected to final compaction by pressing under a pressure of 6-8 MPa. Immediately after the release of the product from the form, a film-forming hydrophobic material is applied - a fat emulsion, bitumen, latex, etc.

After the first pressing stage, a loose structure with a rough surface is formed, which allows a thin layer of water absorbing material to be applied to the surface of the product in the loosened state of 0.5-0.6 mm. Mineral into the penetrant penetrates into the pores on the surface of the molded soil product and under the action of pressure of 6-8 MPa forms

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strong even layer with a thickness of 0.1-0.2 mm. This layer already begins to absorb the soil moisture of the product during molding, which gives the surface adhesiveness and does not allow moisture to reach the surface of the product within 10-30 s (depending on the soil moisture). This time period is sufficient for I, right after molding, to apply a film-forming protective hydrophobic material with good adhesion on the surface of the product.

A pressure of 1-2 MPa is sufficient to give the product a stable shape necessary for the subsequent operations. A pressure of 6-8 Sha is chosen due to the fact that under pressure

Research institutes larger than 8 MPa, the strength of the product increases slightly, and energy costs increase. With a pressure of less than 6 MPa, the resulting strength of products is less than that required for practical use. When the soil moisture is less than 2%, the product does not hold the shape and crumbles, and when the humidity is more than 20%, the product loses its shape due to the high water content and a high degree of plasticity.

Example I. Make a sample of stepped soil wet

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20%. For this, the soil is placed in a mold and pressed under a pressure of 1 MPa. Compressive strength of 0.15 MPa. Then the sample is freed from the mold and the water absorbing material is applied - cement with a consumption of 1.75 kg / m of the surface to be treated. After that, the sample is again placed in a mold and pressed under a pressure of 6 Sha, the compressive strength of 2.5 MPa. Immediately after pressing, the sample is freed from the mold and treated with bitumen at a rate of 5 kg / m.

Example 2. Make a sample of loam moisture content of 2%. To do this, grzsht placed in a form and pressed, under pressure-2 MPa, the compressive strength of 0.45 MPa. The sample is then released from the mold and the water-absorbing material — gypsum — is applied at a rate of 2.5 kg / m. After this, the sample is again placed in a mold and compressed under a pressure of 8 Mia, the compressive strength of 4.85 MPa. Immediately after pressing, the sample is released from the mold and the latex is processed at a flow rate of 3.0 kg Um.

The test results of the samples are shown in the table.

The data obtained indicate that the obtained structural materials from the soil are significantly superior in ITS1.1 to physicomechanical properties.

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Requirements for the use of soils reinforced with stinging materials for the construction of foundations and road and airfield pavements (CH-25-74),

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Claims (1)

The claims are worn out in two stages: the first is The method of manufacturing constructive pressures of 1-2 MPa, on the second - with building materials from the soil, a pressure of 6-8 MPa, and after the first-time filling of the soil of the wet-g stage on the surface according to the knowledge of 2-20% into the mold, pressing of its block put the mineral characterized in that, and after the second stage, hydrophobicity with the aim of increasing the physicomechanical fluid. properties. materials, pressing pro