1. The diamond sand concrete is characterized by being prepared from the following raw materials in parts by weight:

30-35 parts of cement, 50-65.4 parts of machine-made sand, 90-115 parts of broken stone, 15-27 parts of carborundum, 1-5 parts of carborundum regulator, 0.1-2 parts of additive and 14.5-16.5 parts of water;

the methylene blue value of the machine-made sand is 0.5-1.0%.

2. The diamond-sand concrete according to claim 1, characterized in that: the stone powder content of the machine-made sand is 5% -10%.

3. The diamond-sand concrete according to claim 2, characterized in that: the fineness modulus of the machine-made sand is 2.6-2.8%.

4. The diamond-sand concrete according to claim 1, characterized in that: the water-cement ratio in the diamond sand concrete is 0.42-0.45; the sand rate is 45-48%.

5. The diamond-sand concrete according to claim 1, characterized in that: the granularity of the carborundum is 2100-5800 nm.

6. The diamond-sand concrete according to any one of claims 1-5, characterized in that: the cement is low-alkali cement, and the 28-day strength of the low-alkali cement can reach 50 MPa.

7. The diamond-sand concrete according to claim 1, characterized in that: the additive comprises a water reducing agent, and the water reducing rate of the water reducing agent is 30-35%.

8. The diamond-sand concrete according to claim 7, wherein: the water reducing agent is a high-performance polycarboxylic acid compound water reducing agent.

9. The diamond-sand concrete according to claim 1, characterized in that: the diamond dust concrete also comprises carbon fibers, and the weight of the carbon fibers accounts for 1% -3% of the weight of the diamond dust.

10. The method for producing a diamond-sand concrete according to any one of claims 1 to 9, characterized in that: the preparation method comprises the following preparation steps:

uniformly mixing emery and an emery regulator to obtain a mixture A;

uniformly mixing cement, machine-made sand and broken stones to obtain a mixture B;

uniformly mixing an additive and water to obtain a mixed solution;

and uniformly stirring the mixture A, the mixture B and the mixed solution to obtain the carborundum concrete.

Background

With the continuous development of the construction industry, various projects are continuously increased, the demand of natural sand is gradually increased, and the natural sand is randomly mined, disorderly produced and transported under the drive of benefits, so that the environment is seriously damaged. At present, more and more areas gradually appear the phenomenon of natural sand resource shortage, and Sichuan Yibin even the phenomenon of difficult sand demand.

The diamond sand concrete needs natural river sand for preparation, but under the condition that Sichuan Yibin is extremely lack of natural river sand, the diamond sand concrete can be prepared only by artificial machine-made sand processed by mountain stone materials. The inventor finds that the defects of the diamond sand concrete produced by using the machine-made sand on the market are obvious: poor workability, large slump loss, short setting time and poor surface finish.

Disclosure of Invention

The application provides a carborundum concrete and a preparation method thereof, when the carborundum concrete is prepared by machine-made sand, the workability of the concrete is poor, the slump loss is reduced, the setting time is prolonged, and the surface smoothness of the carborundum concrete is good.

In a first aspect, the present application provides a diamond-sand concrete, which adopts the following technical scheme:

the diamond sand concrete is prepared from the following raw materials in parts by weight:

30-35 parts of cement, 50-65.4 parts of machine-made sand, 90-115 parts of broken stone, 15-27 parts of carborundum, 1-5 parts of carborundum regulator, 0.1-2 parts of additive and 14.5-16.5 parts of water;

the methylene blue value of the machine-made sand is 0.5-1.0%.

By adopting the technical scheme, the strength grade of the prepared carborundum concrete is at least C30, and the carborundum concrete has the advantages of good workability, small slump loss, long setting time, good surface smoothness of the formed carborundum concrete and easiness in grinding.

Methylene blue value (MB) of machine-made sand: the method is used for judging the adsorption performance index of particles with the particle size of less than 75 mu m in the machine-made sand. In the application, the machine-made sand with the methylene blue value of 0.5-1.0% can effectively solve the problems of poor surface finish, large color difference, overlarge slump fluctuation and the like of the concrete. In addition, the methylene blue value of 0.5-1.0 percent is matched with the machine-made sand and the carborundum regulator, so that the viscosity of the carborundum concrete can be obviously reduced, the slurry is better extracted, and the initial setting time reaches 8 hours under the condition of not influencing final setting.

Preferably, the water-cement ratio in the diamond sand concrete is 0.42-0.45; the sand rate is 45-48%.

The mechanical sand particles have multiple edges and corners, the flowability of the formed mortar is not as good as that of natural sand mortar, more mortar is needed for mechanical sand concrete to achieve the working performance similar to that of natural sand concrete, the sand rate needs to be improved, however, the increase of the sand rate increases the total specific surface area of fine aggregates, more cement slurry is needed to wrap mechanical sand, if enough slurry is not available, the improvement of the sand rate of the mechanical sand concrete can reduce the working performance of concrete, but the excessive slurry can also influence the strength of concrete, so in the application, the water-cement ratio is 0.42-0.45, the sand rate is 45% -48%, and the workability and the working performance of the diamond sand concrete can be well improved.

Preferably, the carborundum has a particle size of 2100-5800 nm.

The granularity of the carborundum is 2100-5800nm, the stability of the slurry can be effectively enhanced, the hidden trouble of slurry sedimentation can be reduced, the problems of hollowing and cracking, high viscosity, high concrete shrinkage, difficult slurry extraction and the like of the concrete can be effectively solved, and the quality of the carborundum-blended concrete can be improved. In addition, the inventor finds that the carborundum has the particle size of less than 2100nm, and the slurry is easy to settle; and the granularity of the carborundum is more than 5800nm, the concrete is easy to hollowly crack, and the strength of the concrete is influenced.

Preferably, the stone powder content of the machine-made sand is 5% -10%; further preferably, the fineness modulus of the machine-made sand is 2.6% -2.8%; apparent density of mechanism sand 2600kg/m³-2650kg/m³。

Still more preferably, the crushed stone has an apparent density of 2650kg/m³-2700kg/m³Bulk density of 1550kg/m³-1650kg/m³(ii) a The size fraction of the crushed stones is 5-26.5 mm.

By adopting the technical scheme, the grain composition of the diamond sand concrete is stable, and the workability and the strength of the diamond sand concrete can be obviously improved. The stone powder in the machine-made sand does not participate in the hydration of cement, and fine particles in the stone powder enter the crystals of hydration products to play a role in filling the micro-aggregates, so that the compactness of the concrete can be increased, and the strength of the concrete can be enhanced. In addition, 5% -10% of stone powder in the machine-made sand can supplement the fine particles lacking in the concrete, the total amount of powder is increased, and under the condition that the water consumption of the concrete unit volume is not changed, the slurry amount and the slurry viscosity of the concrete are increased, so that the problems of hollowing, cracking and the like of the concrete can be effectively reduced.

Preferably, the cement is low-alkali cement, and the 28-day strength of the low-alkali cement can reach 50 MPa.

The low-alkali cement is adopted, so that the water requirement and the hydration heat temperature of the concrete can be reduced; on the other hand, the low-alkali cement and the additive are matched with each other, the adaptability of the additive is better, and the strength of the obtained concrete is better.

Preferably, the additive comprises a water reducing agent, and the water reducing rate of the water reducing agent is 30-35%; preferably, the water reducing agent is a high-performance polycarboxylic acid compound water reducing agent.

By adopting the technical scheme, the mixing amount of the water reducing agent is low, the water reducing rate is high, the shrinkage is small, the compatibility of the water reducing agent and cement is good, the slump constant retaining performance of the prepared concrete is good, the strength is high, and in addition, the construction time of the concrete can be prolonged.

Preferably, the diamond dust concrete also comprises carbon fibers, and the weight of the carbon fibers accounts for 1% -3% of the weight of the diamond dust.

Further preferably, the length of the carbon fiber is 9-12mm, and the modulus of the carbon fiber is 310-395 GPa.

The carbon fiber is added into the concrete, so that the cracking of the concrete can be effectively reduced, the extension of the crack of the concrete test block can be prevented, in addition, the carbon fiber and the carborundum are matched with each other, the slump of the concrete can be reduced, and the strength of the concrete can be improved. The inventor finds that 9-12mm carbon fiber has better concrete improvement effect and better anti-cracking effect compared with 3-6mm carbon fiber.

In a second aspect, the present application provides a method for preparing the above-mentioned diamond-sand concrete, which adopts the following technical scheme:

a preparation method of the carborundum concrete comprises the following preparation steps:

uniformly mixing emery and an emery regulator to obtain a mixture A;

uniformly mixing cement, machine-made sand and broken stones to obtain a mixture B;

uniformly mixing an additive and water to obtain a mixed solution;

and uniformly stirring the mixture A, the mixture B and the mixed solution to obtain the carborundum concrete.

By adopting the technical scheme, the prepared concrete has stable quality and better performance. The preparation method is simple, easy to implement and convenient for batch production.

In summary, the present application has the following beneficial effects:

1. by adopting the formula, the workability of the carborundum concrete is good, the slump loss is small, the viscosity of the carborundum concrete can be obviously reduced, the slurry is better extracted, the initial setting time reaches 8 hours under the condition of not influencing final setting, the strength grade of the prepared carborundum concrete is at least C30, and the soil surface finish degree is good;

2. in the concrete, the water-cement ratio is 0.42-0.45, and the sand rate is 45-48%, so that the workability and the working performance of the diamond sand concrete can be effectively improved;

3. in this application, low-alkali cement mutually supports with high performance polycarboxylate compound water reducing agent, and the compatibility of the two is good, can make the slump retentivity of concrete good, intensity is high, and can prolong the engineering time of concrete.

Detailed Description

The present application will be described in further detail with reference to examples. Specifically, the following are described: the following examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer; the starting materials used in the following examples are all those conventionally commercially available except where specifically noted.

Cement: p0.425 low-alkali cement with the strength of 50MPa in 28 days, produced by Changning red lion cement company Limited;

and (3) machining sand: methylene blue value of 0.5-1.0%, stone powder content of 5-10%, fineness modulus of 2.6-2.8%, and apparent density of 2600kg/m³-2650kg/m³；

Crushing stone: the particle size is 5-26.5mm, and the apparent density is 2650kg/m³-2700kg/m³Bulk density of 1550kg/m³-1650kg/m³；

Emery: the particle size is 2100-5800 nm;

emery regulator: binli concrete building materials produced by science and technology Limited;

water reducing agent: the high-performance polycarboxylic acid compound water reducing agent has the water reducing rate of 30-35 percent and is produced by Yibinli concrete building material science and technology limited company;

carbon fiber: the length is 9-12mm, and the modulus of the carbon fiber is 310-395 GPa.

Examples

Example 1

The preparation method of the carborundum concrete comprises the following steps:

uniformly mixing 15kg of emery with 1kg of emery regulator to obtain a mixture A;

uniformly mixing 30kg of cement, 50kg of machine-made sand and 115kg of broken stones to obtain a mixture B;

uniformly mixing 0.1kg of high-performance polycarboxylic acid compound water reducing agent and 16.5kg of water to obtain a mixed solution;

and uniformly stirring the mixture A, the mixture B and the mixed solution to obtain the carborundum concrete.

Example 2

The preparation method of the carborundum concrete comprises the following steps:

uniformly mixing 15kg of emery with 1kg of emery regulator to obtain a mixture A;

uniformly mixing 35kg of cement, 65.4kg of machine-made sand and 110kg of broken stones to obtain a mixture B;

uniformly mixing 0.1kg of high-performance polycarboxylic acid compound water reducing agent and 14.5kg of water to obtain a mixed solution;

and uniformly stirring the mixture A, the mixture B and the mixed solution to obtain the carborundum concrete.

Example 3

The preparation method of the carborundum concrete comprises the following steps:

uniformly mixing 15kg of emery with 1kg of emery regulator to obtain a mixture A;

uniformly mixing 34.5kg of cement, 60kg of machine-made sand and 91.7kg of broken stones to obtain a mixture B;

uniformly mixing 0.1kg of high-performance polycarboxylic acid compound water reducing agent and 14.5kg of water to obtain a mixed solution;

and uniformly stirring the mixture A, the mixture B and the mixed solution to obtain the carborundum concrete.

Example 4

The preparation method of the carborundum concrete comprises the following steps:

uniformly mixing 15kg of emery with 1kg of emery regulator to obtain a mixture A;

uniformly mixing 34.5kg of cement, 65kg of machine-made sand and 99.7kg of broken stones to obtain a mixture B;

uniformly mixing 0.1kg of high-performance polycarboxylic acid compound water reducing agent and 14.5kg of water to obtain a mixed solution;

and uniformly stirring the mixture A, the mixture B and the mixed solution to obtain the carborundum concrete.

Example 5

The preparation method of the carborundum concrete comprises the following steps:

uniformly mixing 27kg of carborundum and 1kg of carborundum regulator to obtain a mixture A;

uniformly mixing 33.3kg of cement, 65kg of machine-made sand and 99.7kg of broken stones to obtain a mixture B;

uniformly mixing 0.1kg of high-performance polycarboxylic acid compound water reducing agent with 15kg of water to obtain a mixed solution;

and uniformly stirring the mixture A, the mixture B and the mixed solution to obtain the carborundum concrete.

Example 6

The preparation method of the carborundum concrete comprises the following steps:

uniformly mixing 27kg of carborundum and 5kg of carborundum regulator to obtain a mixture A;

uniformly mixing 33.3kg of cement, 65kg of machine-made sand and 99.7kg of broken stones to obtain a mixture B;

uniformly mixing 0.1kg of high-performance polycarboxylic acid compound water reducing agent with 15kg of water to obtain a mixed solution;

and uniformly stirring the mixture A, the mixture B and the mixed solution to obtain the carborundum concrete.

Example 7

The preparation method of the carborundum concrete comprises the following steps:

uniformly mixing 27kg of carborundum and 3kg of carborundum regulator to obtain a mixture A;

uniformly mixing 33.3kg of cement, 65kg of machine-made sand and 99.7kg of broken stones to obtain a mixture B;

uniformly mixing 0.1kg of high-performance polycarboxylic acid compound water reducing agent with 15kg of water to obtain a mixed solution;

and uniformly stirring the mixture A, the mixture B and the mixed solution to obtain the carborundum concrete.

Example 8

The preparation method of the carborundum concrete comprises the following steps:

uniformly mixing 25kg of carborundum and 3kg of carborundum regulator to obtain a mixture A;

uniformly mixing 33.3kg of cement, 60kg of machine-made sand and 92kg of broken stones to obtain a mixture B;

uniformly mixing 0.1kg of high-performance polycarboxylic acid compound water reducing agent with 15kg of water to obtain a mixed solution;

and uniformly stirring the mixture A, the mixture B and the mixed solution to obtain the carborundum concrete.

Example 9

The preparation method of the carborundum concrete comprises the following steps:

uniformly mixing 25kg of carborundum and 3kg of carborundum regulator to obtain a mixture A;

uniformly mixing 33.3kg of cement (PO42.5R, common portland cement), 60kg of machine-made sand and 92kg of broken stones to obtain a mixture B;

uniformly mixing 0.1kg of high-performance polycarboxylic acid compound water reducing agent with 15kg of water to obtain a mixed solution;

and uniformly stirring the mixture A, the mixture B and the mixed solution to obtain the carborundum concrete.

Example 10

The preparation method of the carborundum concrete comprises the following steps:

uniformly mixing 25kg of carborundum and 3kg of carborundum regulator to obtain a mixture A;

uniformly mixing 33.3kg of cement, 60kg of machine-made sand and 92kg of broken stones to obtain a mixture B;

uniformly mixing 0.1kg of lignosulfonate water reducing agent and 15kg of water to obtain a mixed solution;

and uniformly stirring the mixture A, the mixture B and the mixed solution to obtain the carborundum concrete.

Example 11

The preparation method of the carborundum concrete comprises the following steps:

uniformly mixing 25kg of carborundum, 3kg of carborundum regulator and 0.25kg of carbon fiber to obtain a mixture A;

uniformly mixing 33.3kg of cement, 60kg of machine-made sand and 92kg of broken stones to obtain a mixture B;

uniformly mixing 0.1kg of high-performance polycarboxylic acid compound water reducing agent with 15kg of water to obtain a mixed solution;

and uniformly stirring the mixture A, the mixture B and the mixed solution to obtain the carborundum concrete.

Example 12

The preparation method of the carborundum concrete comprises the following steps:

uniformly mixing 25kg of carborundum, 3kg of carborundum regulator and 0.75kg of carbon fiber to obtain a mixture A;

uniformly mixing 33.3kg of cement, 60kg of machine-made sand and 92kg of broken stones to obtain a mixture B;

uniformly mixing 0.1kg of high-performance polycarboxylic acid compound water reducing agent with 15kg of water to obtain a mixed solution;

and uniformly stirring the mixture A, the mixture B and the mixed solution to obtain the carborundum concrete.

Comparative example

Comparative example 1

Comparative example 1 differs from example 5 only in that the machine-made sand of comparative example 1 has a methylene blue value of 3.0%, and the remainder is in agreement with example 5.

Comparative example 2

Comparative example 2 differs from example 5 only in that the diamond grains were replaced with an equal amount of machine-made sand in comparative example 2, and the remainder remained the same as in example 5.

Comparative example 3

Comparative example 3 differs from example 5 only in that no carborundum modifier is added to comparative example 3, and the remainder remains the same as example 5.

Comparative example 4

Comparative example 3 differs from example 5 only in that natural river sand was used in comparative example 4, and the rest was in accordance with example 5.

Performance test

The compressive strength of the diamond sand concrete samples prepared in examples 1-12 and comparative examples 1-4 was tested according to the standard GB/T50081-2002 Standard test methods for mechanical Properties of ordinary concrete, and the test results are shown in Table 1 below.

The initial slump of the carborundum concrete prepared in the examples 1-12 and the comparative examples 1-4 is detected according to the standard GB/T50080-2016 standard for detecting the performance of common concrete mixtures, the concrete sample is kept still for 1 hour, the slump of the concrete for 1 hour is detected, and the detection result is shown in the following table 1.

TABLE 1

As can be seen by combining examples 1 to 5 and table 1, the water-cement ratio and sand rate of the diamond dust concrete affect the slump and compressive strength of the diamond dust concrete under the condition that the raw materials of the diamond dust concrete are the same, and when the water-cement ratio is 0.42 to 0.45 and the sand rate is 45 to 48 percent, the slump loss of the diamond dust concrete is small and the compressive strength is good.

By combining the example 5 and the comparative example 1 and combining the table 1, it can be seen that under the condition that the water-cement ratio and the sand rate of the diamond-sand concrete are certain, the compressive strength of the diamond-sand concrete is influenced by the performance of the machine-made sand, and the methylene blue value of the machine-made sand is 0.5% -1.0%, so that the strength of the concrete can be improved;

combining example 5 and comparative example 4 with table 1, it can be seen that the machine-made sand of the present application can be used as a fine aggregate of the diamond sand concrete instead of natural river sand under the condition that the water-cement ratio and the sand ratio of the diamond sand concrete are constant.

Combining examples 6-8 and comparative examples 2-3 with Table 1, it can be seen that whether carborundum or carborundum conditioning agent is added, and the dosage of carborundum and carborundum conditioning agent, etc., all affect the slump and compressive strength of the carborundum concrete.

Combining examples 9-10 and table 1, it can be seen that the type of cement and the type of water reducing agent affect the slump and compressive strength of the diamond sand concrete under certain water-cement ratio and sand rate of the diamond sand concrete; in this application, low-alkali cement (P0.425) and high performance polycarboxylate compound water reducing agent mutually support, and reducible carborundum concrete's slump loss improves carborundum concrete's compressive strength.

As can be seen by combining examples 11-12 with Table 1, the compressive strength of the diamond dust concrete is improved by adding steel fibers to the diamond dust concrete.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.