RU2476400C2 - Raw material mix for obtaining construction material - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to construction materials, in particular to heavy concretes and can be used for repairing and manufacturing construction components and structures, intended for protection against gamma-irradiation in construction of boxed, where gamma-therapeutic apparatuses for contact radiation therapy are placed. Raw material mixture for construction material obtaining includes Portland cement of grade not lower than M 500, superplasticiser, water, as course and fine filling agent - galenite with fractions 10-20 mm, 5-10 mm, 1.25-5 mm, 0.63-1.25 mm, 0.16-0.63 mm, with the following consumption of components, kg per concrete m³ : cement of grade not lower than M 500 - 610-650, coarse filling agent - galenite: fraction 10-20 mm - 1170-1460, fraction 5-10 mm - 1315-1750, fine filling agent - galenite: fraction 1.25-5 mm - 585-730, fraction 0.63-1.25 mm - 585-730, fraction 0.16-0.63 mm - 730-950, water - 165-180, superplasticiser, % of cement consumption 0.5-1.

EFFECT: increased density of construction material and improvement of its protective properties against gamma-radiation.

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Description

The invention relates to building materials, in particular to heavy concrete, and can be used for repair and manufacture of building parts and structures designed to protect against gamma radiation during the construction of boxes, which are gamma therapeutic devices for contact radiation therapy.

Known quick-hardening radiation-protective building composite for the manufacture of building products containing technical glycerin, lead oxide, GZh modifier 136-41, water, steel fiber and metal shot (RU 2319675, IPC С04В 28/00, publ. 20.08.2008).

A disadvantage of the known solution is the complexity of the composition and low mechanical strength.

Known raw mix for the preparation of particularly strong and heavy concrete, including cement grade not lower than M 500, coarse and fine aggregate fractions 10-20 mm, 5-10 mm, 1.25-5 mm, 0.63-1.25 mm, 0.16-0.63 mm from the scale of machine-made fire stripping, water and a superplasticizer based on Na - salts of the condensation product of naphthalene sulfonic acid with formaldehyde (RU 2100304, IPC С04В 28/00, publ. 12/27/1997).

A disadvantage of the known raw material mixture is the insufficient density of 3980-4150 kg / m ³ , which reduces the radiation-protective properties of the mixture under gamma radiation.

The technical result consists in reducing the values of the layers of half and tenfold attenuation of gamma radiation and increasing the density of the building material with radiation-protective properties.

The essence of the invention lies in the fact that the raw material mixture for the production of building material, including Portland cement of grade not lower than M 500, coarse and fine aggregate, superplasticizer and water, contains coarse grains of fractions 10-20 mm, 5-10 mm, as coarse and fine aggregate, 1.25-5 mm, 0.63-1.25 mm, 0.16-0.63 mm, with the following consumption of components, kg per m ^{3 of} concrete:

Portland cement grade not lower than M 500 610-650 Coarse aggregate - galena, fractions 10-20 mm 1170-1460 fractions of 5-10 mm 1315-1750 Fine aggregate - galenite fractions 1.25-5 mm 585-730 fractions of 0.63-1.25 mm 585-730 fractions 0.16-0.63 mm 730-950 Water 165-180 Superplasticizer, % of the mass flow rate of Portland cement 0.5-1

The following components were used for the production of the raw mix: Portland cement with a grade of at least M 500 that meets the requirements of GOST 10178-95; water (GOST 23732-79); galena is a mineral, lead sulfide PbS, with a density of 7.59 g / cm ³ , a molecular weight of 239.27 g, a decomposition temperature of 1114 ° C. As a superplasticizer, Na-based superplasticizer can be used - salts of the product of the condensation of naphthalene sulfonic acid with formaldehyde (TU 6-36-0204229-625-90), sodium methylsiliconate GKZh-11 (TU 6-02-696-76), sodium ethylsiliconate GKZh -10 (TU 6-02-696-76) and GKZh-94 ethylhydrosiloxane liquid (GOST 10834-76).

A method of manufacturing a raw material mixture to obtain a building material is as follows. Mix the galena of these fractions with Portland cement in dry form in a forced-action mixer. Then the mixing water is mixed with a superplasticizer and introduced into the mixer, stirring for 2 minutes, so that the resulting mixture has a cone settlement of not more than 6 cm.

Table 1 shows the composition of the raw mixes to obtain building material. The density of the building material was determined according to GOST 12730.1-78, compressive strength according to GOST 10180-99, water absorption according to GOST 12730.3-78. The results of the physico-mechanical properties of the obtained material are given in table.2.

The density of the building material with these ratios of components is 4556-5800 kg / m ³ .

As can be seen from table 2, the proposed raw material mixture for obtaining a building material, in comparison with the known solution, has a higher density and lower values of the half and tenfold attenuation of radiation, which allows its use in structures to protect personnel working under the influence of gamma radiation.

Claims (1)

The raw material mixture for the production of building material, including Portland cement of a grade of at least M 500, coarse and fine aggregates, superplasticizer and water, characterized in that it contains galenite fractions of 10-20 mm, 5-10 mm, 1.25 as large and small aggregates -5 mm, 0.63-1.25 mm, 0.16-0.63 mm with the following consumption of components, kg / m ³ concrete:
Portland cement grade not lower than M 500 610-650 Large aggregate - galenite fractions of 10-20 mm 1170-1460 fractions of 5-10 mm 1315-1750 Fine aggregate - galenite fractions 1.25-5 mm 585-730 fractions of 0.63-1.25 mm 585-730 fractions 0.16-0.63 mm 730-950 Water 165-180 Superplasticizer,% by weight of cement consumption 0.5-1