1. The medium-high temperature high-strength heat-resistant concrete is characterized by comprising the following raw materials: 40-45 parts of a mixture, 42-47 parts of high bauxite, 4-6 parts of micro silicon powder and 7-9 parts of aluminate cement; the concrete is also added with an inorganic salt water reducing agent, and the inorganic salt water reducing agent accounts for 0.15-0.25% of the total weight of the concrete; the mixture is a mixture of cobblestones and recycled high-alumina bricks, and the mass ratio of the cobblestones to the recycled high-alumina bricks is 1: 1-3.

2. The medium-high temperature high strength heat resistant concrete according to claim 1, characterized in that: the concrete comprises the following raw materials in parts by weight: 40 parts of mixed material, 47 parts of high-alumina bauxite, 5 parts of micro silicon powder and 8 parts of aluminate cement; the concrete is also added with an inorganic salt water reducing agent, and the inorganic salt water reducing agent accounts for 0.2 percent of the total weight of the concrete.

3. The medium-high temperature high strength heat resistant concrete according to claim 1 or 2, characterized in that: al of the recycled high-alumina brick₂O₃The content is more than 65 percent; the volume density of the recycled high-alumina brick is more than 2.3g/cm³。

4. The medium-high temperature high strength heat resistant concrete according to claim 3, characterized in that: crushing and screening the recycled high-alumina bricks to obtain recycled high-alumina brick particles; the particle size distribution of the recycled high-alumina brick particles is 0.05-12 mm.

5. The medium-high temperature high strength heat resistant concrete according to claim 4, wherein: the grade ratio of the recycled high-alumina brick particles is 5-12 mm: 1-5 mm: 0.05-1 mm and 5-8: 5-7: 4-6.

6. The medium-high temperature high strength heat resistant concrete according to claim 3, characterized in that: the bauxite is bauxite chamotte; crushing and screening the bauxite chamotte to obtain bauxite chamotte particles; the grain size distribution of the bauxite chamotte particles is 0.05-3 mm.

7. The medium-high temperature high strength heat resistant concrete according to claim 6, characterized in that: the grade ratio of the bauxite chamotte particles is 1-3 mm: 0.05-1 mm: 0.05-0.1 mm: 2: 1.

8. The medium-high temperature high strength heat resistant concrete according to claim 3, characterized in that: the cobblestone has the grade ratio of 5-12 mm to 1-5 mm to 0.05-1 mm to 1:1: 1.

Background

Heat-resistant concrete has been widely used in the thermal equipment and the structures which are subjected to high temperature for a long time in the industries of metallurgy, chemical industry, petroleum, light industry, building materials and the like, such as the lining of an industrial chimney or flue, the refractory lining of an industrial kiln, the foundation and the shell of a high-temperature boiler. Compared with the traditional refractory brick, the heat-resistant concrete has the following characteristics: the production process is simple, and only a stirrer and a vibration forming machine are needed; the construction is simple and the mechanization is easy; the kiln with any structural form can be built, and the heat-resistant concrete can be used for building a complex kiln form according to the production process requirements, and the like. In order to realize the heat resistance of concrete, a refractory material needs to be added to the heat-resistant concrete, which increases the use cost of the heat-resistant concrete.

Disclosure of Invention

In order to solve the technical problems, the invention provides the following technical scheme:

the medium-high temperature high-strength heat-resistant concrete comprises the following raw materials: 40-45 parts of a mixture, 42-47 parts of high bauxite, 4-6 parts of micro silicon powder and 7-9 parts of aluminate cement; the concrete is also added with an inorganic salt water reducing agent, and the inorganic salt water reducing agent accounts for 0.15-0.25% of the total weight of the concrete; the mixture is a mixture of cobblestones and recycled high-alumina bricks, and the mass ratio of the cobblestones to the recycled high-alumina bricks is 1: 1-3.

Preferably, the concrete comprises the following raw materials in parts by weight: 40 parts of mixed material, 47 parts of high-alumina bauxite, 5 parts of micro silicon powder and 8 parts of aluminate cement; the concrete is also added with an inorganic salt water reducing agent, and the inorganic salt water reducing agent accounts for 0.2 percent of the total weight of the concrete.

Preferably, the Al of the recycled high-alumina brick₂O₃The content is more than 65 percent; the volume density of the recycled high-alumina brick is more than 2.3g/cm³。

Preferably, the recycled high-alumina brick is crushed and screened to obtain recycled high-alumina brick particles; the particle size distribution of the recycled high-alumina brick particles is 0.05-12 mm.

Preferably, the grade ratio of the recycled high-alumina brick particles is 5-12 mm: 1-5 mm: 0.05-1 mm and 5-8: 5-7: 4-6.

Preferably, the bauxite is bauxite chamotte; crushing and screening the bauxite chamotte to obtain bauxite chamotte particles; the grain size distribution of the bauxite chamotte particles is 0.05-3 mm.

Preferably, the grade ratio of the bauxite chamotte particles is 1-3 mm: 0.05-1 mm: 0.05-0.1 mm: 2: 1.

Preferably, the grading ratio of the cobblestones is 5-12 mm: 1-5 mm: 0.05-1 mm: 1: 1.

The invention has the following function principle:

the recycled high-alumina bricks are used as the raw materials of the heat-resistant concrete, and are used as the refractory materials in the heat-resistant concrete, so that the waste high-alumina bricks are recycled, and the cost of the heat-resistant concrete is reduced. The invention comprehensively uses the recycled high-alumina bricks and the high-alumina bauxite as main refractory materials, thereby greatly improving the heat resistance of the heat-resistant concrete.

The invention uses the silica fume as the mineral admixture, and the silica fume can be fully dispersed and filled in the gaps of the cement particles after being doped into the concrete, so that the slurry is more compact; ca (OH) generated after micro silicon powder hydrates cement₂Has strong absorption capacity, forms well-developed calcium silicate gel, and greatly improves the strength of concrete.

Compared with the prior art, the invention has the beneficial effects that:

the recycled high-alumina brick is used, so that the cost of the heat-resistant concrete is effectively reduced, and the aim of recycling resources is fulfilled; the invention has reasonable proportion, comprehensively uses the recycled high-alumina bricks and high-alumina bauxite as main refractory materials, and greatly improves the heat resistance of the heat-resistant concrete.

Detailed Description

The present invention will be further described with reference to specific examples, which are illustrative of the invention and are not to be construed as limiting the invention.

Example 1

The medium-high temperature high-strength heat-resistant concrete comprises the following raw materials:

the concrete comprises the following raw materials in parts by weight: 40 parts of mixed material, 47 parts of high-alumina bauxite, 5 parts of micro silicon powder and 8 parts of aluminate cement; the mixture is a mixture of cobblestones and recycled high-alumina bricks, and the mass ratio of the cobblestones to the recycled high-alumina bricks is 1: 2. The concrete is also added with an inorganic salt water reducing agent, and the inorganic salt water reducing agent accounts for 0.2 percent of the total weight of the concrete.

Wherein Al of the high-alumina bricks is recovered₂O₃The content is more than 75 percent; the volume density of the recycled high-alumina brick is more than 2.3g/cm³。

Crushing and screening the recycled high-alumina bricks to obtain recycled high-alumina brick particles; the grade ratio of the recycled high-alumina brick particles is 5-12 mm: 1-5 mm: 0.05-1 mm and 7:5: 5.

The bauxite is bauxite chamotte; crushing and screening the bauxite chamotte to obtain bauxite chamotte particles; the grade ratio of the bauxite chamotte particles is 1-3 mm: 0.05-1 mm: 0.05-0.1 mm: 2: 1.

The grading ratio of the cobblestones is 5-12 mm: 1-5 mm: 0.05-1 mm: 1: 1.

Example 2

The medium-high temperature high-strength heat-resistant concrete comprises the following raw materials:

45 parts of mixture, 42 parts of high-alumina bauxite, 4 parts of micro silicon powder and 9 parts of aluminate cement; an inorganic salt water reducing agent is additionally added into the concrete, and the inorganic salt water reducing agent accounts for 0.25 percent of the total weight of the concrete; the mixture is a mixture of cobblestones and recycled high-alumina bricks, and the mass ratio of the cobblestones to the recycled high-alumina bricks is 1: 1.

Wherein Al of the high-alumina bricks is recovered₂O₃The content is more than 75 percent; the volume density of the recycled high-alumina brick is more than 2.3g/cm³。

Crushing and screening the recycled high-alumina bricks to obtain recycled high-alumina brick particles; the grade ratio of the recycled high-alumina brick particles is 5-12 mm: 1-5 mm: 0.05-1 mm: 5: 5.

The bauxite is bauxite chamotte; crushing and screening the bauxite chamotte to obtain bauxite chamotte particles; the grade ratio of the bauxite chamotte particles is 1-3 mm: 0.05-1 mm: 0.05-0.1 mm: 2: 1.

The grading ratio of the cobblestones is 5-12 mm: 1-5 mm: 0.05-1 mm: 1: 1.

Example 3

The medium-high temperature high-strength heat-resistant concrete comprises the following raw materials:

42 parts of a mixture, 45 parts of high-alumina bauxite, 6 parts of micro silicon powder and 7 parts of aluminate cement; an inorganic salt water reducing agent is additionally added into the concrete, and the inorganic salt water reducing agent accounts for 0.15 percent of the total weight of the concrete; the mixture is a mixture of cobblestones and recycled high-alumina bricks, and the mass ratio of the cobblestones to the recycled high-alumina bricks is 1: 3.

Wherein Al of the high-alumina bricks is recovered₂O₃The content is more than 65 percent; the volume density of the recycled high-alumina brick is more than 2.3g/cm³。

Crushing and screening the recycled high-alumina bricks to obtain recycled high-alumina brick particles; the grade ratio of the recycled high-alumina brick particles is 5-12 mm: 1-5 mm: 0.05-1 mm: 8:7: 6.

The bauxite is bauxite chamotte; crushing and screening the bauxite chamotte to obtain bauxite chamotte particles; the grade ratio of the bauxite chamotte particles is 1-3 mm: 0.05-1 mm: 0.05-0.1 mm: 2: 1.

The grading ratio of the cobblestones is 5-12 mm: 1-5 mm: 0.05-1 mm: 1: 1.

The results of testing some performance indexes of the products in the above examples are shown in the following table:

the technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.