RU2237300C2 - Binder for manufacturing radiation-shielding building materials - Google Patents

Abstract

FIELD: manufacture of building materials.

SUBSTANCE: invention concerns compositions of sulfur binders and can find use in manufacture of sulfur concrete designed for protection against radiation and for filling joints of lining, equipment, and building structures operated under ionization emission conditions. Binder containing sulfur (44.2-46.6%), filler (52.0-54.25%), and paraffin as modifying additive (0.25-0.3%) contains, as filler, barite with specific surface area 250 m²/kg and average density 4350 kg/m² and additionally contains reinforcing component: carbon fibers 10-15 mm in length.

EFFECT: increased bend strength of binder and improved its protective ability against neutron emission.

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Description

The invention relates to compositions of sulfur binders and can be used for the manufacture of sulfur concrete, intended for protection against radiation, as well as for pouring the joints of the lining, equipment and building structures, operating under conditions of exposure to ionizing radiation.

A known composition for the manufacture of building products (and.with. No. 1085958, C 04 V 19/06, C 04 V 43/12), including, wt.%:

Smelting heads 50.0 ... 55.0

Trisulfide piperidine 1.0 ... 1.1

Flax fire 8.0 ... 10.0

Ground quartz sand 35.0 ... 40.0

The disadvantage of this composition is the use of expensive and potentially hazardous to human health organic additives - trisulfidepiperidine. In addition, quartz sand is used as a filler, which, under the action of ionizing radiation, significantly changes its crystalline structure, which leads to a decrease in the physicomechanical parameters of binders, concrete, and mortars prepared on its basis [1]. The reinforcing additive - flax flax - is also destroyed by ionizing radiation, which will lead to premature destruction of the materials prepared on the specified composition.

The closest is a composition for the manufacture of radiation-protective building materials (RF patent No. 2152368, C 04 V 28/36), including, wt.%:

Sulfur 7.55 ... 9.5

Paraffin 0.45 ... 0.5

Filler (production waste

optical glass with specific

surface 2000-2200 cm ² / g) 14 ... 17

Aggregate (lead fraction with

particle diameter 3-4 mm) The rest.

The binder in this composition is a mixture of sulfur, paraffin and ground waste from the production of optical glass. This binder is characterized by the use of a special filler (a waste product for the production of optical glass), which is formed only at specialized enterprises. This significantly limits the possibility of building production of the developed compositions. In addition, the waste product of the production of optical glass and sulfur binder are fragile materials, therefore, products based on them have low crack resistance and strength.

The purpose of the invention is to increase the bending strength of the binder.

This goal is achieved in that the binder for the manufacture of radiation-protective building materials, including sulfur, a filler and a modifying additive - paraffin, contains barite as a filler with a specific surface of 250 m ² / kg and an average density of 4350 kg / m ³ and additionally a reinforcing additive - carbon fiber with a length of 10 ... 15 mm with the following content of components, wt.%:

Sulfur 44.2 ... 46.6

Specified Filler 52.0 ... 54.25

Specified fiber 1.15 ... 1.25

Paraffin 0.25 ... 0.3.

To prepare the binder used technical sulfur that meets the requirements of GOST 127-93.

The use of barite as an filler having an average density of 4350 kg / m ³ and a specific surface area of 250 m ² / kg makes it possible to increase the strength and crack resistance of the binder.

The introduction of a binder reinforcing agent - carbon fiber with a length of 10 ... 15 mm, obtained by cutting carbon fibers of the UKN - 2.5 / P brand - can significantly increase bending strength and, in addition, increase the neutron removal coefficient. The introduction of paraffin can improve the rheological properties of the mixture, increase the strength and protective properties of astringent neutron radiation.

A binder is prepared as follows. Dosed quantities of paraffin and carbon fiber are introduced into the sulfur melted at a temperature of 150 ... 160 ° C, the mixture is stirred until a homogeneous mass is obtained. Then barite heated to a temperature of 150 ... 160 ° C is introduced and the mixture is again thoroughly mixed, kept for 5 ... 10 minutes at a temperature of 150 ... 160 ° C and placed in heated metal molds. After cooling for 30 ... 40 minutes, the molds are stripped.

The compositions of the proposed binder are shown in table 1, and its properties are shown in table 2.

As can be seen from table 2, the proposed binder has the rheological properties of plastic mixtures, a sufficiently high average density and tensile strength in bending.

Literature

1. Dubrovsky VB Radiation resistance of building materials. - M .: Stroyizdat, 1977 .-- 285 p.

Claims (1)

A binder for the manufacture of radiation-protective building materials, including sulfur, a filler and a modifying additive - paraffin, characterized in that it contains barite with a specific surface area of 250 m ² / kg and an average density of 4350 kg / m ³ and additionally a reinforcing additive - carbon fiber 10-15 mm long with the following content of components, wt.%: Sulfur 44.2-46.6 Specified Filler 52.0-54.25 Specified Fiber 1.15-1.25 Paraffin 0.25-0.3