RU2567925C2 - Composition for sulphur concretes - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to methods of obtaining sulphur concretes for application in manufacturing building constructions and production of construction products, subjected to acid and salt aggression. Composition for sulphur concretes, containing sulphur binding agent and inert filler, is characterised by the fact that sulphur binding agent is obtained by mixing at temperature 135°C in vortex mixing apparatus for 45-60 sec sulphur with addition of black oil in weight ratio 6:1 and spraying ammonia and fumaric acid in amount 200 mg per 1 m³ of sulphur respectively, until homogeneous mixture is obtained, with inert filling agent containing the following fraction composition in wt %: screenings of rubble crushing - fraction 20-10 mm - 10, fraction 10-5 mm - 10, fraction 5-2.5 mm - 10; washed river sand - fraction 2.5-1.25 mm - 10, fraction 1.25-0.63 mm - 15, fraction 0.63-0.315 mm - 15, fraction 0.315-0.071 mm - 15; grinding of washed river sand - fraction 0.071 mm and smaller - 15. To obtain composition sulphur binding agent and inert filler can be used in weight ratio 23:77.

EFFECT: increased strength and fire resistance of concrete.

2 cl, 2 tbl

Description

 The invention relates to methods for producing sulfur concrete for its use in the manufacture of building structures and the production of building products susceptible to acid and salt aggression.

There is a method of producing sulfur-concrete mix, which consists in using sulfuric acid based on elemental sulfur and aggregate as sand and sludge as a sulfur binder, [1].

The main significant disadvantage of this method is the formation of large internal stresses in the sulfur concrete during cooling of the sulfur concrete mixture due to shrinkage of elemental sulfur, which contribute to the development of cracks, which at an alternating temperature leads to its destruction.

It is also known to obtain a composition for sulfur concretes by mixing polymer sulfur with an inert aggregate of a fixed fractional composition of crushed stone and crushed stone crushing residues [2]. This composition is accepted by the Applicant as the closest analogue to the prototype of the claimed invention.

It is also not without a significant drawback - the scarcity of screening of crushing of fine fractions of crushed stone (2.5-0.071 and less than mm), as well as low strength and fire resistance of products from sulfur concrete.

The objective of the proposed technical solution is to obtain sulfur concrete with an accessible inert aggregate and increased fire resistance composition, which has sufficient strength, resistance to alternating temperatures.

The problem is solved in the invention by obtaining sulfur binder by mixing at a temperature of 135 ° C in a vortex mixing apparatus for 45-60 seconds of sulfur with the addition of fuel oil in a mass ratio of 6: 1 by spraying ammonia and fumaric acid at a rate of 200 mg and 1000 mg per 1 m ^{3 of} sulfur, respectively, until a homogeneous mixture is obtained, and the inert aggregate contains the following fractional composition in wt.%: screening crushing of limestone (dolomite) gravel - fraction 20-10 mm - 10, fraction 10-5 mm - 10, fraction 5-2, 5 mm - 10; washed quartz river sand - fraction 2.5-1.25 mm - 10, fraction 1.25-0.63 mm - 15, fraction 0.63-0.315 mm - 15, fraction 0.315-0.071 mm - 15; grinding of river quartz washed sand - a fraction of 0.071 mm or less - 15.

In addition, the task is realized in the invention through the use of sulfur binder and inert aggregate in a mass ratio of 23:77.

From the patent technical literature and patent documentation, we know the composition for sulfur concretes with identical essential features to the claimed technical solution, which indicates its novelty and compliance with this criterion for the invention.

The combination of the above essential features is necessary and sufficient for the implementation of the objectives of the proposed solutions. Moreover, between the set of essential features and the task posed and solved by the invention, there is a causal relationship in which the set of features itself is the cause, and the problem they solve is the result. Based on these arguments, it is legitimate to conclude that the claimed technical solution meets the established criterion - inventive step (non-obviousness).

The claimed technical solution can be repeatedly implemented to obtain the above technical result.

The solution thus meets the criterion of “industrial applicability”.

The proposed solution as an invention was tested in the Engineering and Technical Center of Gazprom dobycha Astrakhan LLC. The results of this testing are given below.

Example. The resulting composition for sulfur concrete according to the proposed method was tested for compressive strength of samples in the form of cubes with dimensions of 150 × 150 × 150 mm, having different fractional composition. The tests were carried out according to GOST 10180-90 (Concretes. Methods for determining the strength of the control samples).

The results of the strength tests are presented in table 1.

As can be seen from this table, the inventive composition has a compressive strength comparable to the crushing screening composition.

The results of fire tests of the claimed composition are presented in table 2.

Technical appraisal and economic advantages of the proposed solutions in comparison with the prototype are as follows:

- increase the fire resistance of sulfur concrete,

- the availability of the fractional composition of the inert aggregate;

- increasing the strength of sulfur concrete.

Information sources

1. RF patent No. 2088549, IPC ⁶ C04B 28/36, publ. 08/27/1997.

2. RF patent No. 2356867, IPC ⁶ C04B 28/36, publ. 05/27/2009. Bull. No. 15 is a prototype.

Claims (3)

1. Composition for sulfur concrete containing sulfur binder and an inert aggregate, characterized in that the sulfur binder is obtained by mixing at a temperature of 135 ° C in a vortex mixing apparatus for 45-60 seconds of sulfur with the addition of fuel oil in a mass ratio of 6: 1 and spraying ammonia and fumaric acid at the rate of 200 mg and 1000 mg per 1 m ^{3 of} sulfur, respectively, until a homogeneous mixture is obtained, and the inert aggregate contains the following fractional composition in wt.%: screening of crushed stone crushed stone - fraction 20-10 mm - 10, fraction 10- 5 mm - 10, fraction 5-2.5 mm - 10; washed river sand - fraction 2.5-1.25 mm - 10, fraction 1.25-0.63 mm - 15, fraction 0.63-0.315 mm - 15, fraction 0.315-0.071 mm - 15; grinding river washed sand - fraction 0.071 mm or less - 15. 2. The composition according to p. 1, characterized in that for its production using sulfur binder and inert aggregate in a mass ratio of 23:77.