RU2515274C1 - Mineral powder - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: mineral powder for an asphalt concrete mixture, activated by grinding natural material, contains magnesium silicate rock - wehrlite - as the natural material, and grinding is carried out in a rod-shaped vibration apparatus for 13 minutes until achieving the following grain composition, wt %: smaller than 1.25 mm - 100; smaller than 0.315 mm - 94.2; smaller than 0.071 mm - 84.8.

EFFECT: high water resistance.

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Description

The invention can be used to obtain an asphalt mix.

Mineral powder is an active structural component of asphalt concrete. Its performance and the service life of the pavement depend on its quality. Mineral powders from carbonate rocks are considered traditional. Recently, however, developments are underway to obtain mineral powder from other types of raw materials, in particular siliceous rock species.

The composition of the same purpose closest to the claimed invention for the totality of features is a mineral powder from activated quartzite (Konstantin Boskholov Asphalt concrete using activated silica-containing mineral powders. Thesis for the degree of candidate of technical sciences: VSGTU: 05.23.05. Ulan-Ude , 2007, 114 p.).

Known mineral powder, adopted as a prototype, differs from the proposed one in that it contains a silica-containing rock - quartzite. And the proposed mineral powder contains magnesium silicate rock - verlite and has higher physical and mechanical properties compared to the prototype.

The technical result of the invention is the production of a new type of mineral powder from verlite, which has increased water resistance, adsorption activity and low cost.

The specified technical result is achieved by the fact that the proposed mineral powder consists of magnesium silicate rock - verlite, crushed for 13 minutes.

A comparison of the invention with other technical solutions known from the prior art made it possible to establish the following. In a known technical solution, quartzite was used to obtain a mineral powder. The mineral powder was activated by co-grinding quartzite with quicklime in an amount of 3% by weight of the mineral powder to a specific surface area of 350 m ² / kg. The disadvantage is the use of quicklime as an activating additive.

The claimed mineral powder uses a magnesium silicate rock - verlite, which is a natural raw material of the Baikal region. The grinding of this rock for 13 minutes provides not only its fine grinding, but also the activation of particles and a change in the structure of their surface layers, which affects the adsorption activity of the mineral powder and the improvement of its physical and mechanical properties.

The analysis of the prior art by the applicant, including a search by patent and scientific and technical sources of information and identification of sources containing information about analogues of the claimed invention, allowed to establish that the applicant did not find an analogue characterized by features identical to all the essential features of the claimed invention. The definition from the list of analogues, as well as the prototype as the closest in the set of essential features, allowed us to identify the set of essential in relation to the perceived technical result - obtaining new types of mineral powders with sufficiently high physical and mechanical characteristics of the distinctive features in the claimed substance set forth in the claims .

Therefore, the claimed invention meets the condition of "novelty."

The search results showed that the claimed invention does not follow explicitly from the prior art for the specialist, since the influence of the transformations provided for by the essential features of the claimed invention was not revealed from the prior art determined by the applicant. Namely, the interaction of verlite, crushed for 13 minutes in a rod vibrating installation, with bitumen, which provides a positive reaction to achieve a technical result - improving the reliability of the road surface.

Therefore, the claimed invention meets the condition of "inventive step".

Verlite of the Northern Baikal region, proposed as a mineral powder, is a magnesium silicate rock of the following chemical composition, wt.% (See table 1). It is a type of peridotite, consisting of olivine and monoclinic pyroxene, and the fayalite molecule in olivine is 10-14%. When developing deposits, it will be in dumps.

In this technical solution, this raw material is first used as a mineral powder after grinding it for 13 minutes.

The characteristics of the obtained mineral powder are shown in table 2. For comparison, the indicators of the known prototype are shown in table 3.

Analysis of the results of table 2 shows that:

- mineral powder, consisting of verlite, crushed for 10 minutes, according to the basic physical and mechanical indicators, meets the requirements of GOST R 52129-2003 for mineral powder brand MP-2;

- he does not observe swelling of samples from a mixture of powder with bitumen;

- it has increased water resistance compared to conventional mineral powder from carbonate rocks;

- has a good bitumen rate.

Table 1 The chemical composition of verlite, wt.% Component SiO ₂ A1 ₂ O ₃ FeO Fe ₂ O ₃ CaO MgO K ₂ O
+ Na ₂ O Verlite 39.70 1.80 10.70 0.42 0.81 43.83 0.19

table 2 Physico-chemical characteristics of mineral powder from verlite No. Name Indicators Requirements GOST R 52129-2003 (MP-2) one. Grain composition,% by weight: smaller than 1.25 mm one hundred not less than 95 finer 0.315 mm 94.2 from 80 to 95 finer 0.071 mm 84.8 not less than 60 2. True density, g / cm ³ 3.34 - 3. Porosity,% 30.7 No more than 40 four. Swelling of samples from a mixture of powder with bitumen 0 No more than 3.0 5. Water resistance of samples from a mixture of powder with bitumen 0.2 No more than 0.7 6. Bitumen rate, g 55.6 No more than 80 7. Humidity,% by weight 1.8 No more than 2.5

Table 3 Physico-chemical characteristics of the known prototype No. p \ p Name Indicators Requirements GOST R 52129-2003 (MP-2) one. Grain composition,% by weight: smaller than 1.25 mm one hundred not less than 95 finer 0.315 mm 95 from 80 to 95 finer 0.071 mm 90 not less than 60 2. Porosity,% 32.1 No more than 40 3. Swelling of samples from a mixture of powder with bitumen 0.93 No more than 3.0 four. Bitumen rate, g 53,2 No more than 80 5. Humidity,% by weight 0.2 No more than 2.5

Thus, the proposed mineral powder has the following advantages compared with the known:

- does not require activation by co-grinding with lime in comparison with the prototype;

- there is no swelling of samples from a mixture of powder with bitumen;

- samples from a mixture of powder with bitumen have a high water resistance;

- reduced the cost of mineral powder through the use of waste rock, which is verlite;

- the raw material base for obtaining mineral powder was expanded at the expense of local raw materials.

The proposed mineral powder differs from the prototype in that it contains magnesium silicate rock - verlite and has improved physical and mechanical properties.

The proposed mineral powder was developed in the laboratory of chemistry and technology of natural raw materials, BIP SB RAS.

The foregoing indicates the feasibility of the invention to obtain the specified technical result, which allows us to conclude that the proposal meets the condition of "industrial applicability".

Claims (1)

Mineral powder for asphalt mix activated by grinding natural raw materials, characterized in that it contains magnesium silicate rock - verlite as natural raw materials, and grinding is carried out in a rod vibrating unit for 13 minutes to the grain composition, wt.%: Less than 1.25 mm - one hundred; less than 0.315 mm - 94.2; less than 0.071 mm - 84.8.