RU2549652C2 - Caprolon-reinforced fibrous concrete - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to construction industry, specifically to construction composite materials, i.e. a blend of caprolon fibre-reinforced concrete, can be used in cast-in-place structures, decorative cladding materials, surfacing and flooring. Caprolon-reinforced fibrous concrete comprises as follows, wt %: cement 17-20, fine sand 72.85-67.7, water 10-12, caprolon fibre 0.15-0.3.

EFFECT: enhanced compression strength, recycling of caprolon parts of ships.

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Description

The invention relates to construction, in particular to building composite materials, namely, a mixture of caprolonofibroconcrete, and can be used in construction, for example, in elements of monolithic structures, decorative facing elements, in structures of coating and overlap.

The concrete mixture is known (see SP 52-104-2006 "Steel-fiber concrete structures"), the reinforcement of which is steel fiber. The disadvantage of this mixture is the high level of formation of electromagnetic fields, which is undesirable for further operation. In addition, the risk of corrosion of steel structures increases. In addition, the use of this type of fiber will increase material costs in its production and increase the weight of the final material.

The closest analogue (prototype) is fiber-reinforced concrete (see WO 1999058468 A1, class C04B 111/20, publ. 11/18/1999).

The technical task is to obtain a material that allows to increase the strength characteristics of concrete, while reducing the risk of fiber decomposition in a concrete environment.

The technical result is an increase in compressive strength, the secondary use of ship parts made of caprolon.

It is achieved through the use of caprolon fiber made from marine bearings. It three-dimensionally strengthens and increases the cracking resistance of fiber-reinforced concrete, creates the necessary margin of safety and helps to maintain structural integrity with through cracks, and also significantly reduces the total weight of building structures. In addition, the use of recyclables as a starting material for fiber can increase the percentage of recycling of plastic waste.

A mixture of caprolonofiber concrete is prepared in various ways.

The production of a mixture of caprolonofibrobetona is based on the use of a standard composition of cement mortar of grade M 150 with the addition of caprolon raw materials from ship parts in the form of strips 2 mm wide and 100 mm long, with the following ratio of components, wt.%:

cement 17-20 fine sand 72.85-67.7 water 10-12 caprolon fiber 0.15-0.3

The mixture was prepared by separate weight dosing of cement, sand, water and caprolon raw materials and mixing them in a cyclic concrete mixer. Mixing time 5 min. In the next stage, the mixture was distributed in molds and compacted on a vibrating table. After that, the remains of caprolonofibrobeton were removed from the edges of the mold, the surface of the product was leveled. Finished samples gained strength under natural hardening conditions for 14 days.

Example 1

M150 brand cement mortar was taken as a basis and a batch was made based on two cubes of 150 * 150 * 150 mm. A caprolon bearing from a ship part was taken as caprolon material, cut into strips 2 mm wide and 100 mm long in an amount of 0.15 wt.% Per sample. For comparison, one sample was made only from a cement mortar (standard), and the second with the addition of caprolon fiber in the following ratio of components, wt.%:

cement 17 fine sand 72.85 water 10 caprolon fiber 0.15

The obtained samples gained strength within 14 days, then studies were conducted using non-destructive and destructive testing methods (see GOST R53231-2008 "Concretes. Control and evaluation rules"). According to the results of non-destructive testing, a sample with caprolon fiber was 1.8 MPa stronger than the standard, and according to the results of destructive testing, the compressive strength of the reinforced concrete increased by 0.7 MPa.

Example 2

The basis was taken cement mortar grade M 150 and made a batch based on two cubes of 150 * 150 * 150 mm. A caprolon bearing from a ship part was taken as caprolon feedstock, cut into strips 2 mm wide and 100 mm long in an amount of 0.3 wt.% Per sample. For comparison, one sample was made only from a cement mortar (standard), and the second with the addition of caprolon fiber in the following ratio of components, wt.%:

cement twenty fine sand 67.7 water 12 caprolon fiber 0.3

The obtained samples gained strength within 14 days, then studies were conducted using non-destructive and destructive testing methods (see GOST R53231-2008 "Concretes. Control and evaluation rules"). According to the results of non-destructive testing, a sample with caprolon fiber was 1.7 MPa stronger than the standard, and according to the results of destructive testing, the strength of fiber concrete in compression increased by 1.4 MPa (see Table 1).

The use of caprolonofiber concrete allows to completely or partially reduce the volume of traditional reinforcing work, i.e. reduce energy and material consumption of the constructed structures, increase the turnaround time. This provides him with high technical and economic efficiency when used in building structures and during their repair.

Claims (1)

Kaprolonofibroconcrete, including cement, fine-grained sand, caprolon fiber and water, characterized in that as caprolon fiber use wastes resulting from the processing of used ship parts, in the following ratio, wt.%:
cement 17-20 fine sand 72.85-67.7 water 10-12 caprolon fiber 0.15-0.3

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