RU2245860C1 - Fibrous concrete composition - Google Patents

Abstract

FIELD: building materials.

SUBSTANCE: fibrous concrete composition contains cement binder, filler, reinforcing fibrous component and water. Said reinforcing fibrous component is beforehand treated in low-temperature glow discharge plasma of alternate current under the pressure of 50-250 Pa, current of 1.0-2.2 mA/cm² for 20-60 sec.

EFFECT: increased bending strength, compressive resistance, and shock strength.

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Description

The invention relates to the building materials industry and can be used in the manufacture of fiber reinforced concrete compositions reinforced with non-metallic fiber.

State of the art

The known composition of fiber concrete [Rabinovich F.N. Dispersion-reinforced concrete. - M .: Stroyizdat, 1989, pp. 130-131], which contains water, a filler, cement as a binder, and fiberglass as a reinforcing material.

The disadvantages of this material are:

- low bending strength;

- low compressive strength;

- low impact resistance.

The closest in composition to the invention is the composition of fiber concrete [Technology and durability of dispersion-reinforced concrete. Collection of scientific papers. - L., 1984, pp. 67-68], which contains water, cement as a binder, sand with Mkr = 2 and a maximum grain size of not more than 5 mm as a filler material, fiberglass as a reinforcing material, introduced into the construction dough in an amount of 1-2% by weight of the material, with a ratio of cement and filler (C: P) 1: 1 and a ratio of water to cement (W / C) 0.4.

However, this material has disadvantages:

- low bending strength - 9 MPa;

- low compressive strength - 60 MPa;

- low impact resistance - 2.6 kgm / cm ² .

SUMMARY OF THE INVENTION

The objective of the invention was to search for a composition of fiber concrete containing a cement binder, a filler, a reinforcing non-metallic fibrous component and water, which would increase the bending strength of the material, the compressive strength of the material and increase the impact resistance.

This object is achieved in that the composition of the fibrous concrete containing cement binder, filler, reinforcing non-metallic fibrous component and water, contains reinforcing non-metallic fibrous component, pre-processed in a low-temperature plasma glow glow discharge of alternating current at a pressure of 50-250 Pa, current 1.0- 2.2 mA / cm ² for 20-60 seconds.

The invention allows to obtain the following advantages:

- increase the strength of the material in bending by an amount from 25 to 60%;

- increase the strength of the material under compression by an amount from 40 to 90%;

- resistance to shock by 10 to 30%.

Information confirming the reproducibility of the invention

To prepare the proposed composition of fiber concrete use:

- as a binder - cement, for example M500;

- as a filler material - traditionally used for the manufacture of concrete mixtures, for example: expanded clay sand, quartz sand, etc .;

- as a non-metallic fibrous reinforcing material, various fibers of organic and inorganic origin can be used, for example, fiberglass, polyamide, cotton (industrial waste), linen (industrial waste), polyethylene terephthalate, asbestos. A prerequisite is the pretreatment of these fibers in the plasma of a glow discharge of alternating current at a pressure of 50-250 Pa, a current strength of 1.0-2.2 mA / cm ² for 20-60 seconds. The reinforcing fiber component is used in an amount of 1-4% by weight.

The composition is prepared in the traditional way. Cement dough is prepared from those taken in the required ratio of cement and water (W / C = 0.34-0.4), which are thoroughly mixed until a homogeneous mass is obtained. The required amount of filler is added to the resulting mass (C: P = 1: 1-1: 0.7) and again mixed to a homogeneous mass. The required amount of fibrous reinforcing component that has undergone preliminary processing in glow discharge plasma is introduced into the resulting mass and mixed until a homogeneous mass is obtained. From the obtained composition of fiber-reinforced concrete, a sample of a standard shape of 40 × 40 × 160 mm is formed. After hardening and aging of the samples for 28 days, test the samples. The compressive strength of the material is determined according to GOST 310-4-76, the bending strength is determined according to the method of GOST 10180-78. The resistance of the material to impact was determined both for the prototype and for the invention in the same way, namely, according to the well-known technique on vertical pile head [Technology and durability of dispersively reinforced concrete, Collection of scientific papers, L., 1984, p. 94].

Qualitative indicators of the composition using non-metallic fibers of various chemical nature and physical structure processed as reinforcing material in a low-temperature glow discharge plasma at various parameters are presented in Table. 1.

Table 1.
Qualitative indicators of the composition of fiber-reinforced concrete using non-metallic fibers processed in a low-temperature glow discharge plasma as a reinforcing material No. p.p Knitting. Filler C: P W / C Arm Mat./% Processing options Technical Results Time, t, sec. Current, I mA / cm ² Pressure P, Pa Other on a bend, MPa Other compression, MPa Resistance to shock (work destruction, kg · m / cm ² ) 1 Cement M500 Quartz, sand 1: 1 0.37 Polyester / 3 twenty 1.5 100 11.5 85 3.22 2 Cement M500 Quartz, sand 1: 0.7 0.4 Polyester / 2 twenty 1,5 200 thirteen 95 2.97 4 Cement M500 Quartz, sand 1: 1 0.34 Fiberglass / 2 thirty 1 150 14 75 2.93 5 Cement M500 Quartz, sand 1: 1 0.37 Fiberglass / 1 40 2 100 14.5 100 3.15 6 Cement M500 Expanded clay, sand 1: 0.7 0.4 Fiberglass / 2 fifty 1,5 100 14 110 3.31 7 Cement M500 Quartz, sand 1: 1 0.37 Fiberglass / 2 60 1,5 fifty thirteen 105 3.27 10 Cement M500 Quartz, sand 1: 1 0.34 Linen / 3 twenty 1,5 100 14 95 2.99 eleven Cement M500 Quartz, sand 1: 0.7 0.4 Linen / 2 thirty 2 100 14.5 115 3.13 thirteen Cement M500 Quartz, sand 1: 1 0.4 Asbestos / 3 40 1 150 14 100 3.37 14 Cement M500 Expanded clay, sand 1: 0.8 0.37 Asbestos / 4 60 2.2 250 14.5 105 3.39 Prototype Cement M500 Quartz, sand 1: 1 0.4 Fiberglass / 2 - - - nine 60 2.6

Claims (1)

The composition of fiber-reinforced concrete containing cement binder, filler, reinforcing non-metallic fibrous component and water, characterized in that it contains reinforcing non-metallic fibrous component, pre-treated in a low-temperature AC glow discharge plasma at a pressure of 50-250 Pa, current strength 1.0-2 , 2 mA / cm ² for 20-60 s.