RU1834874C - Concrete mix - Google Patents

Abstract

The invention relates to construction and can be used in the preparation of concrete mixtures. The concrete mixture contains Portland cement, crushed stone fractions of 5-20 mm, waste from the copper-molybdenum industry and water, moreover, the ratio of the components is as follows, wt.%: Portland cement 13.58-21.30; crushed stone 52.86-55.94; waste 16.76-21.01; water 9.08-9.47. 5 tab.

Description

The invention relates to construction and can be used in the manufacture of concrete mixtures using waste from the mining industry.

The aim of the invention is to increase the strength of concrete and reduce its bulk density.

This is achieved by the fact that the concrete mixture contains cement, gravel, waste from the copper-molybdenum industry and water in the following ratio of components, May,%:

Portland cement 13.58-21,

Crushed stone52.86-55.94

 Waste 16.76-21.01

Water 9.08-9.47

The waste is ground, dusty material. They are formed as a result of 2-3-fold crushing of the ore with subsequent grinding in concentrator ball mills. After the flotation process and the extraction of ore concentrate by wet method, these wastes in the form of pulp are transported through pipes and

they are stored in special tailing dumps by the method of washing. Modulously in size, this waste is classified as very fine sand. Table 2 shows the chemical composition of the waste (tailings) of the copper-molybdenum plant.

In order to determine the physicomechanical characteristics of concrete, concrete samples were manufactured molded in cubic metal molds measuring 100x100x100 mm. The test samples were densified on a laboratory bi-table with oscillations of 2800 times per minute, with an amplitude of 0.55 mm. Testing of concrete samples was carried out on a hydraulic press of 50-150 tons. Due to the lack of tensile strength indicators in the prototype, control samples were also made to determine the tensile strength of concrete on ordinary quartz sand. The strength characteristics of concrete were determined in accordance with GOST-10180-78, several were manufactured and tested.

СО О5 ьь 00

2

Cj

hundred batches (in each batch of 6-8 pieces) of concrete samples, as a result of which the most optimal ratio of the mixture components was found. As an example, Table 3 shows 8 compositions of the proposed mixture, composition No. 1, the amount of cement taken from the lower limit of the proposed composition, in compositions 2-7, the amount of cement is within the proposed mixture, in composition No. 8 the amount of cement is above the upper limit of the proposed composition . In the above examples, Portland cement was taken of grade 500, and crushed stone - fractions of 5-20 mm. The number of components is shown in kg.

Table 4 shows the compositions of the same eight samples and two known, where the mass of the components is shown in% of the total mass of the mixture.

As can be seen from the comparative analysis of tables 3 and 4, the strength characteristics of the proposed concrete mixture above.

Table 5 shows the test results of the samples of the proposed mixture and control samples on quartz sand to determine the flexural and axial tensile strengths (the average of three indicators is taken).

It can be seen from Table 5 that in high-grade concrete using waste, the bending strength is; 11.6% of the compressive strength, and concrete samples on quartz sand 10.3%. The difference in bending strength is 1.6-1.3 1.3.

Thus, the comparative increase in the flexural strength of concrete using waste with the flexural strength of concrete on quartz sand is

1.3x100 100

 12.6%

The increase in axial tensile strength in concrete using waste compared with concrete on quartz sand is

8.90 - 7.1 - 1.70 or 1-70 at 00 23

The increase in flexural strength of concrete grade 300 using waste is

15.1 -13.6 1.5 or - fyg - 11.03% Growth with axial tension composition / wet

ABOUT

10.7-9.0-1.7 or -1.7 100 18.9%

Average tensile strength 10 and concrete bending using waste

12.6 +23.8 + 11.03 + 18.9

16.56%

higher than concrete on quartz sand.

Thus, the use of waste from the copper-molybdenum industry. Increases the strength of concrete compared with

similar concrete .:

Currently, in the Armenian SSR, the reserves of quartz sand are almost exhausted, while there is a huge amount of waste from the copper-molybdenum industry (over 100 million m3) and each year it adds more than .6 million m3. These wastes accumulate in tailings and are not used for any purpose, occupying a large territory and polluting the environment. In addition, electricity costs are reduced by approximately 8 million kW / h and labor costs by 18 thousand people. days a year. Finally, the use of this waste solves a number of issues,

related to the protection of nature and the environment (reclamation of liberated lands, etc.).

40

Claims (1)

The claims Concrete mixture including cement, crushed stone, fine aggregate from mining waste and water, characterized in that, in order to increase strength and reduce the bulk density of concrete, copper-molybdenum wastes are used as fine aggregate in the following ratio of components: wt.%: Cement 13.58-21.30 Crushed stone52.86-55.94 Waste from the copper-molybdenum industry 16.76-21.01 Water Table 1 Continuation of the table. 1 Table 2 Table 3 Continuation of the table. 3 Table 4 Table 5 Continuation of the table. S