CN112645655A

CN112645655A - Green high-performance concrete and preparation method thereof

Info

Publication number: CN112645655A
Application number: CN202011545578.7A
Authority: CN
Inventors: 王文
Original assignee: Dongguan Jianye Concrete Co ltd
Current assignee: Dongguan Jianye Concrete Co ltd
Priority date: 2020-12-23
Filing date: 2020-12-23
Publication date: 2021-04-13

Abstract

The application relates to the technical field of concrete, and particularly discloses green high-performance concrete and a preparation method and application thereof. A green high performance concrete comprising: the method comprises the following steps of pretreating recycled coarse aggregate and recycled fine aggregate, cement, a high-efficiency air-entraining water reducing agent, mineral powder and water; the preparation method comprises the following steps: dry premixing the recycled coarse aggregate, the cement and the high-efficiency air-entraining water reducing agent, and then adding water and uniformly stirring to obtain a slurry concrete mixture; then uniformly mixing the added mineral powder and the slurry concrete mixture; and finally, adding the recycled fine aggregate until the recycled fine aggregate is uniformly mixed with the slurry concrete mixture. The application of the green high-performance concrete recycles the waste concrete and the waste baked bricks, saves resources and is green and environment-friendly. And the treated waste concrete has the advantages of reduced internal pores and improved hardness, and the prepared concrete has higher impermeability strength and compressive strength.

Description

Green high-performance concrete and preparation method thereof

Technical Field

The application relates to the technical field of concrete, in particular to green high-performance concrete and a preparation method thereof.

Background

The recycled concrete is green environment-friendly concrete prepared by crushing, cleaning and grading waste concrete blocks, mixing the crushed, cleaned and graded concrete blocks with a grading formula according to a certain proportion, partially or completely replacing natural aggregates (mainly coarse aggregates) such as sand stones and the like, and adding cement, water and the like.

However, the waste concrete blocks have more pores, and a large amount of micro cracks exist in the recycled aggregate due to the external force in the process of crushing the recycled aggregate. At this time, when the recycled aggregate is used as the aggregate of new concrete, moisture is easy to permeate into the concrete, corrosion effect is generated on the reinforcing steel bars and the concrete, the alkalinity of the concrete is reduced, a passive film on the surface of the reinforcing steel bars is damaged, the corrosion and expansion of the reinforcing steel bars are caused, the cracking and peeling of a concrete protective layer are further caused, the service function and the mechanical property of the structure are continuously deteriorated, the durability of the structure is lost, and the actual service life of the engineering is shortened.

Therefore, when the waste concrete is recycled, how to improve the performance of the recycled concrete, especially the anti-permeability performance of the recycled concrete structure, becomes an important problem to be solved in practical engineering.

Disclosure of Invention

In order to improve the impermeability of a concrete structure, the application provides green high-performance concrete and a preparation method thereof.

In a first aspect, the present application provides a green high performance concrete, which adopts the following technical scheme:

the green high-performance concrete comprises the following raw materials in parts by weight:

and (3) regenerating coarse aggregate: 1010 and 1290 parts;

regenerating fine aggregate: 540-680 parts;

cement: 230-360 parts;

high-efficiency air-entraining water reducing agent: 1-2 parts;

mineral powder: 20-35 parts;

water: 110-180 parts;

the mineral powder is a powdery solid formed by processing waste baked bricks, the recycled coarse aggregate and the recycled fine aggregate are preferable, and the recycled coarse aggregate and the recycled fine aggregate are prepared from waste concrete through the following pretreatment steps:

pretreatment: after the waste concrete is subjected to sorting, crushing and magnetic separation to remove nonmetal, impurities such as silt and the like on the surface of the waste concrete are removed by ultrasonic cleaning, and water is drained to obtain a waste concrete block a;

primary water leaching: crushing the waste concrete block a into particles with the particle size of less than 40mm, soaking the particles in constant-temperature water for 3-4 days, stirring for 12-18h, taking out and airing to obtain a waste concrete block b;

temperature difference crushing: baking the waste concrete block b for 8-12h in a high-temperature drying environment, then putting into ice water, stirring until particles with the particle size of less than 25mm are formed, taking out and airing to obtain waste concrete c;

screening: screening the waste concrete block c, wherein particles with the particle size range of 2-25mm are primary selected recycled coarse aggregates, and particles with the particle size range of less than 5mm are primary selected recycled fine aggregates;

glue dipping: respectively soaking the primary selected recycled coarse aggregate and the primary selected recycled fine aggregate into glue in a stirring state for 5-7 h;

secondary water leaching: and (3) solidifying and dispersing the primary selected recycled coarse aggregate and the primary selected recycled fine aggregate after glue soaking, respectively putting into water for soaking for 4-5d, taking out and airing to prepare the recycled coarse aggregate and the recycled fine aggregate.

This application adopts the aggregate of waste concrete after handling as the concrete, effective resources are saved, and green reduces the influence that waste concrete produced the environment. After this application carries out a series of processings to waste concrete, the recycled aggregate texture is hard, and inside microcrack is few, and during the concrete that makes, can higher resistance hydrostatic pressure, has higher impervious strength and compressive strength. Through tests, the recycled concrete of the application has the impermeability strength reaching P6 and above, belongs to impermeable concrete, and has the compressive strength grade reaching C50 grade of common concrete. The reason is presumed to be that the waste concrete treated by the method has fewer internal microcracks and pores, and is soaked by epoxy resin glue, so that a layer of hard film is formed on the surface of the waste concrete block to enhance the structural strength of the waste concrete, the extension or enlargement of the microcracks in the subsequent concrete preparation process is reduced, and the waste concrete has better structural stability and durability.

Preferably, the recycled coarse aggregate and the recycled fine aggregate are both continuously graded.

By adopting the technical scheme, the continuously graded recycled aggregate particles are neat, so that the prepared concrete has the advantages of fine structure, high compactness and good anti-permeability effect.

Preferably, in the temperature difference crushing step, the temperature range of the high-temperature baking is 180-.

By adopting the technical scheme, the concrete prepared from the recycled aggregate prepared at the baking temperature in the range has better anti-permeability strength and compressive strength, and the presumed reason is that the medium micro cracks of the waste concrete at the baking temperature are enlarged until the waste concrete is crushed into small particles, so that the micro cracks in the small particles are reduced.

Preferably, in the glue dipping step, polypropylene fibers are dispersed in the glue.

By adopting the technical scheme, the polypropylene fiber can fill the internal micro cracks and the holes of the waste concrete, so that the filling effect on the holes of the waste concrete is further improved, and the anti-permeability strength and the compressive strength of the prepared concrete are further improved.

Preferably, the polypropylene fibers are of the nanometer grade and have a length of less than 1 mm.

Through adopting above-mentioned technical scheme, when polypropylene fiber's length overlength, can not fill the inside microcrack and the space of abandonment concrete to discover at the test process, when length was greater than 1mm, polypropylene fiber dispersion was inhomogeneous bonds easily and adheres on the surface of abandonment concrete, is wrapped up by epoxy glue again, makes the particle diameter grow of aggregate, and the space grow between the aggregate, thereby influences the performance of concrete.

Preferably, the content of the polypropylene fiber in the glue is 0.03-0.05kg/m³。

By adopting the technical scheme, the impermeability strength of the prepared concrete is improved. When the content of the polypropylene fiber is too low, the influence on the impermeability strength of the concrete is not great; when the content of the polypropylene fiber is higher than 0.05kg/m³When the strength of the barrier is increased, the barrier strength cannot be always increased.

Preferably, the particle size of the mineral powder is 20-60 μm.

By adopting the technical scheme, when the particle size range of the mineral powder is 20-60 mu m, the impermeability and compressive strength of the concrete are good. At the moment, the mineral powder fills gaps among the aggregates, so that the compactness of the vegetation concrete is further improved.

In a second aspect, the present application provides a method for preparing a green high-performance concrete, which adopts the following technical scheme:

a preparation method of green high-performance concrete comprises the following steps:

the method comprises the following steps: dry material premixing is carried out on the recycled coarse aggregate, the cement and the high-efficiency air-entraining water reducing agent, and a mixture is obtained after uniform mixing;

step two: putting the mixture into stirring equipment, adding water into the stirring equipment, and uniformly stirring to obtain a slurry concrete mixture;

step three: putting the mineral powder into stirring equipment, and continuously stirring until the mineral powder and the slurry concrete mixture are uniformly mixed;

step four: and finally, putting the recycled fine aggregate into stirring equipment, and continuously stirring until the recycled fine aggregate is uniformly mixed with the slurry concrete mixture to obtain the high-strength recycled concrete.

By adopting the technical scheme, the method for preparing the concrete firstly mixes the recycled coarse aggregate, the cement and the high-efficiency air-entraining water reducing agent, so that the surface of the recycled coarse aggregate can be uniformly wrapped by the cement, the high-efficiency air-entraining water reducing agent and other powder materials. After the slurry is formed, the adhesion among the aggregates is enhanced, and then the mineral powder is added, so that the cement hydration heat in the mixing process is reduced, the internal structure of the concrete is improved, and the impermeability of the concrete is improved. And finally, adding the recycled fine aggregate to ensure that the recycled fine aggregate is fully mixed between the slurry, so that the mixing uniformity is improved. The preparation process of the concrete is simple, can improve the uniformity of aggregate mixing, and is suitable for industrial mass production.

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

1. the waste concrete is used as aggregate for preparing the concrete, and the waste baked bricks are used as mineral powder of the vegetation concrete, so that resources are saved, and the construction waste is fully utilized. The waste concrete is treated, so that the internal porosity is reduced, and the hardness of the recycled aggregate is improved; through the matching of the raw materials in parts by weight, the prepared concrete has higher anti-permeability strength and compressive strength;

2. according to the method for treating the waste concrete, the waste concrete is soaked in the epoxy resin glue, so that the adhesion of micro cracks in the waste concrete is increased, gaps and porosity in the process of preparing the concrete are reduced, and the anti-permeability strength and the compressive strength of the prepared concrete are improved;

3. in the process of treating the waste concrete, the nano-grade polypropylene fiber with the length less than 1mm is added into the glue, and the polypropylene fiber can fill micro cracks and pores in the waste concrete, so that the filling effect of the pores in the waste concrete is further improved, and the anti-permeability strength and the compressive strength of the prepared concrete are further improved;

4. according to the preparation method of the concrete, the raw materials are dry-mixed, and then water is added to the raw materials to form slurry, so that the recycled concrete prepared in the application is uniformly mixed in the preparation process, and the mixing efficiency is high.

Detailed Description

The present application is further described in detail in connection with the following examples.

Some of the raw material sources in the following examples are shown in table 1:

examples of production of recycled coarse aggregate and recycled fine aggregate

Preparation example 1

S1 pretreatment: after the nonmetal of the waste concrete is removed through sorting, crushing and magnetic separation, putting the waste concrete into a water tank, cleaning the waste concrete by using ultrasonic waves to remove impurities such as silt on the surface of the waste concrete, fishing out the waste concrete, and draining to obtain a waste concrete block a;

s2 primary water leaching: crushing the waste concrete block a into particles with the diameter less than 40mm, soaking the particles in water with the constant temperature of 40 ℃ for 3h, stirring the particles for 18h, taking out the particles and airing the particles to obtain a waste concrete block b;

s3 temperature difference crushing: baking the waste concrete block b for 8 hours in a dry environment at the temperature of 180 ℃, quickly putting into ice water, stirring until particles with the particle size of less than 25mm are formed, taking out and airing to obtain waste concrete c;

s4 screening: screening the waste concrete block c, wherein continuously graded particles with the particle size range of 5-25mm are used as primary recycled coarse aggregates, and continuously graded particles with the particle size range of less than 5mm are used as primary recycled fine aggregates;

s5 glue dipping: respectively soaking the primary selected recycled coarse aggregate and the primary selected recycled fine aggregate in the glue in a stirring state for 7 hours;

s6 secondary water leaching: and (3) solidifying and dispersing the primary selected recycled coarse aggregate and the primary selected recycled fine aggregate after glue dipping, putting into water for soaking for 4d, taking out and airing to obtain the recycled coarse aggregate and the recycled fine aggregate.

Preparation example 2

s2 primary water leaching: crushing the waste concrete block a into particles with the diameter less than 40mm, soaking the particles in water with the constant temperature of 40 ℃ for 3.5h, stirring the particles for 15h, taking out the particles and airing the particles to obtain a waste concrete block b;

s3 temperature difference crushing: baking the waste concrete block b for 10 hours in a dry environment at the temperature of 200 ℃, quickly putting into ice water, stirring until particles with the particle size of less than 25mm are formed, taking out and airing to obtain waste concrete c;

s5 glue dipping: respectively soaking the primary selected recycled coarse aggregate and the primary selected recycled fine aggregate into the glue in a stirring state for 6 hours;

s6 secondary water leaching: and (3) solidifying and dispersing the primary selected recycled coarse aggregate and the primary selected recycled fine aggregate after glue dipping, putting into water for soaking for 5d, taking out and airing to obtain the recycled coarse aggregate and the recycled fine aggregate.

Preparation example 3

s2 primary water leaching: crushing the waste concrete block a into particles with the diameter less than 40mm, soaking the particles in water with the constant temperature of 40 ℃ for 4h, stirring the particles for 12h, taking out the particles and airing the particles to obtain a waste concrete block b;

s3 temperature difference crushing: baking the waste concrete block b for 12 hours in a dry environment at the temperature of 230 ℃, quickly putting into ice water, stirring until particles with the particle size of less than 25mm are formed, taking out and airing to obtain waste concrete c;

s5 glue dipping: respectively soaking the primary selected recycled coarse aggregate and the primary selected recycled fine aggregate into glue in a stirring state for 5 hours;

s6 secondary water leaching: and (3) solidifying and dispersing the primary selected recycled coarse aggregate and the primary selected recycled fine aggregate after glue dipping, putting into water for soaking for 4.5d, taking out and airing to obtain the recycled coarse aggregate and the recycled fine aggregate.

Preparation example 4

The difference between the preparation example and the preparation example 2 is that in the screening process of S4, particles with the particle size of 5mm and particles with the particle size of 25mm are selected as primary recycled coarse aggregates, and particles with the particle size of 3mm are selected as primary recycled fine aggregates.

Preparation example 5

The difference between the preparation example and the preparation example 2 is that the baking temperature of the waste concrete block b is 160 ℃ in the S3 temperature difference crushing process.

Preparation example 6

The difference between the preparation example and the preparation example 2 is that the baking temperature of the waste concrete block b is 250 ℃ in the S3 temperature difference crushing process.

Preparation example 7

The difference between the preparation example and the preparation example 2 is that in the glue dipping process of S5, nano-grade polypropylene fibers are uniformly dispersed in glue water. The length of the polypropylene fiber is less than 1mm, and the content of the polypropylene fiber in the glue is 0.03kg/m 3.

Preparation example 8

The difference between the preparation example and the preparation example 7 is that the content of the polypropylene fiber in the glue is 0.04kg/m 3.

Preparation example 9

The difference between the preparation example and the preparation example 7 is that the content of the polypropylene fiber in the glue is 0.05kg/m 3.

Preparation example 10

The difference between the preparation example and the preparation example 7 is that the content of the polypropylene fiber in the glue is 0.02kg/m 3.

Preparation example 11

The difference between the preparation example and the preparation example 7 is that the content of the polypropylene fiber in the glue is 0.06kg/m 3.

Preparation example 12

This preparation example differs from preparation example 7 in that the polypropylene fiber had a length of 3 mm.

Comparative preparation example

Comparative preparation example 1

After waste metals are removed from the recycled coarse aggregate waste concrete through sorting, crushing and magnetic separation, selecting waste concrete with the particle size range of 5-20mm and continuous gradation as recycled coarse aggregate; waste concrete with the grain diameter of less than 5mm is selected as recycled fine aggregate.

Examples

Example 1

The green high-performance concrete is prepared by the following steps:

the recycled coarse aggregate and the recycled fine aggregate are the recycled coarse aggregate and the recycled fine aggregate prepared in the preparation example 2.

The method comprises the following steps: carrying out dry material premixing on 1010kg of recycled coarse aggregate, 230kg of cement and 2kg of high-efficiency air-entraining water reducing agent, and uniformly mixing to obtain a mixture;

step two: putting the mixture into a concrete mixer, adding water into the concrete mixer, and uniformly mixing to obtain a slurry concrete mixture;

step three: putting 20kg of mineral powder with the particle size of 20 mu m into a concrete mixer, and continuously stirring until the mineral powder and the slurry concrete mixture are uniformly mixed;

step four: and finally, putting 690kg of the recycled fine aggregate into stirring equipment, and continuously stirring until the recycled fine aggregate is uniformly mixed with the slurry concrete mixture to obtain the high-strength recycled concrete.

Examples 2 to 3

The difference from example 1 is that the weight of part of the components is different, and the components and parts by weight are shown in table 2.

TABLE 2 weight list of the raw material components in examples 1-3

Example 4

The difference from example 2 is that the recycled coarse aggregate and the recycled fine aggregate of preparation example 1 were used as the recycled coarse aggregate and the recycled fine aggregate.

Example 5

The difference from example 2 is that the recycled coarse aggregate and the recycled fine aggregate of preparation example 3 were used as the recycled coarse aggregate and the recycled fine aggregate.

Example 6

The difference from example 2 is that the recycled coarse aggregate and the recycled fine aggregate of preparation example 4 were used as the recycled coarse aggregate and the recycled fine aggregate.

Example 7

The difference from example 2 is that the recycled coarse aggregate and the recycled fine aggregate of preparation example 5 were used as the recycled coarse aggregate and the recycled fine aggregate.

Example 8

The difference from example 2 is that the recycled coarse aggregate and the recycled fine aggregate of preparation example 6 were used as the recycled coarse aggregate and the recycled fine aggregate.

Example 9

The difference from example 2 is that the recycled coarse aggregate and the recycled fine aggregate of preparation example 7 were used as the recycled coarse aggregate and the recycled fine aggregate.

Example 10

The difference from example 9 is that the recycled coarse aggregate and the recycled fine aggregate of preparation example 8 were used as the recycled coarse aggregate and the recycled fine aggregate.

Example 11

The difference from example 9 is that the recycled coarse aggregate and the recycled fine aggregate of preparation example 9 were used as the recycled coarse aggregate and the recycled fine aggregate.

Example 12

The difference from example 9 is that the recycled coarse aggregate and the recycled fine aggregate of preparation example 10 were used as the recycled coarse aggregate and the recycled fine aggregate.

Example 13

The difference from example 9 is that the recycled coarse aggregate and the recycled fine aggregate of preparation example 11 were used as the recycled coarse aggregate and the recycled fine aggregate.

Example 14

The difference from example 9 is that the recycled coarse aggregate and the recycled fine aggregate of preparation example 12 were used as the recycled coarse aggregate and the recycled fine aggregate.

Example 15

The difference from example 9 is that in step four, the particle size of the ore fines is 40 μm.

Example 16

The difference from example 9 is that in step four, the particle size of the ore fines is 60 μm.

Example 17

The difference from example 9 is that in step four, the particle size of the ore fines is 70 μm.

Example 18

The difference from example 9 is that in step four, the particle size of the ore fines is 20 μm.

Comparative example

Comparative example 1

The difference from example 1 is that the recycled coarse aggregate and the recycled fine aggregate prepared in comparative preparation example 1 were used as the recycled coarse aggregate and the recycled fine aggregate.

Comparative examples 2 to 3

The difference from example 1 is that the components and their respective weights are shown in table 3.

TABLE 3 Components of comparative examples 2-3 and corresponding weight tables

Performance test

And carrying out a compressive strength test and an impermeability test on the recycled concrete.

Water penetration resistance: the impermeability grade of the concrete standard test block is tested according to a step-by-step pressurization method in GB/T50082-2009 Standard test methods for the long-term performance and durability of ordinary concrete.

Compressive strength: the test of the compressive strength in GB/T50081-2019 concrete physical and mechanical property test method Standard is carried out, and the compressive strengths of the concrete standard test block on the 7 th day and the 28 th day are respectively detected.

The results of the tests for the compressive strength and the impermeability of the test samples 1 to 18 and the control samples 1 to 3 are shown in Table 4.

TABLE 4 test results of compressive strength test and impermeability test

By combining examples 1-3 and comparative example 1, and by combining table 4, it can be seen that the value of the hydrostatic resistance of the green high-performance concrete prepared by the method is twice that of the concrete prepared by simply crushing and screening the waste concrete, and the impermeability grade is further twice that of the comparative example; and the compressive strength of the green high-performance concrete prepared by the method is higher than that of the concrete prepared by a comparative example after the curing for 7 days or 28 days. Test results show that the method for pretreating the waste concrete improves the anti-permeability strength and the compressive strength of the concrete structure. The reason for this is presumed to be that, in the course of processing the waste concrete, the internal microcracks of the waste concrete are continuously enlarged by an external force, so that the massive waste concrete is continuously broken, and the volume of the waste concrete is continuously reduced in the processing course. At this moment, the micro cracks in the waste concrete are less and less, and the pores in the waste concrete are filled through the impregnation of the epoxy resin glue, so that the water seepage strength of the concrete prepared by the application is further improved. And after the epoxy resin glue is dried (cured), a compact and firm outer layer film is formed outside the waste concrete, so that the hardness of the recycled aggregate prepared after the waste concrete is crushed is enhanced. Therefore, when the recycled aggregate is used as a raw material to prepare concrete, the recycled aggregate has higher anti-permeability strength and compressive strength.

It can be seen from the combination of examples 1 to 3 and examples 4 and 5, and from Table 4 that the compressive strength of the recycled concrete obtained is affected by adjusting the process parameters in the preparation of the recycled aggregate.

By combining examples 1-3 and comparative examples 1-2, and by combining table 4, it can be seen that the raw material weight ratio can achieve the P8 impermeability strength, and the compressive strength of the recycled concrete can achieve the strength grade of C50 common concrete. The weight parts of the raw materials of the comparative example are not equal to the weight parts of the concrete, so that the concrete cannot achieve the impermeability effect, and the strength grade of the prepared concrete is only the strength grade of common concrete C40.

Combining examples 2 and 6 and the data in table 4, it can be seen that whether the concrete prepared from the continuously graded recycled coarse aggregate and the recycled fine aggregate has a large influence on the anti-permeability strength and the compressive strength, wherein the reason may be that the pores between the coarse aggregates are large when the concrete prepared from the recycled coarse aggregate with a single particle size is used, and the porosity is large because the recycled fine aggregate with a single particle size cannot fill the part of the pores, so that the prepared concrete has low compactness, poor anti-permeability effect and weak compressive strength.

In combination with examples 2, 7 and 8 and the data in table 4, it can be seen that the excessive or excessive baking temperature during the temperature difference crushing process can reduce the hydrostatic pressure resistance value and compressive strength value of the prepared concrete, and it is presumed that the reason is that the excessive or excessive baking temperature cannot reduce the microcracks in the waste concrete, and the mixing in cold water may prolong or increase the microcracks, thereby affecting the impermeability and compressive strength of the prepared concrete.

Combining examples 2 and 9, and combining the data in table 4, it can be seen that the addition of polypropylene fibers in the glue can improve the impermeability and compressive strength of the prepared concrete. At the moment, the compressive strength of the concrete reaches 59.0Mpa, almost reaches the strength level of common concrete C60, and supposedly, in the glue soaking process of the waste concrete, polypropylene fibers enter or fill cracks or pores possibly existing in the waste concrete in the stirring process, so that the porosity of the waste concrete is reduced, and the impermeability and the compressive strength of the vegetation concrete are improved. As can be seen by combining the data of examples 10-11 and examples 12-13, the polypropylene fiber content is 0.03-0.05kg/m³When the content of the polypropylene fiber is less than 0.03kg/m, the polypropylene fiber has better impermeability strength and little change of corresponding compressive strength³In comparison with the concrete prepared in example 2 without polypropylene fibers, the impermeability and compressive strength of the concrete are not changed much; when the content of the polypropylene fiber is higher than 0.05kg/m³When compared with the polypropylene fiber added in example 9, the concrete showed the anti-permeability strength and the compressive strength of 0.03kg/m³The small difference indicates that the more the content of the polypropylene fiber, the higher the impermeability and compressive strength of the concrete.

Combining example 9 and example 14, and the data in table 4, it can be seen that the concrete has a certain decrease in both the barrier strength and compressive strength when the polypropylene fibers are too long. The polypropylene fiber with the overlong length can not fill the micro cracks and the gaps in the waste concrete, but can be adhered to the surface of the waste concrete and wrapped by epoxy resin glue, so that the particle size of the aggregates is increased, the gaps among the aggregates are increased, and the mechanical property of the concrete is influenced.

By combining the example 9 and the examples 15 to 16 and combining the data in the table 4, it can be seen that in the concrete preparation process, the powder formed by grinding the waste baked bricks is used as mineral powder, and in the preparation process, secondary hydration reactions except hydration reaction of cement occur, so that partial hydration heat is reduced, pores generated in the concrete planting process are reduced, the compactness of the concrete is improved, and the impermeability of the concrete is improved; it can be seen from the data of examples 17 to 18 that the mineral powder particle size affects the concrete compressive strength and impermeability strength, and the mineral powder particle size range is 20 to 60 μm, which is better. At the moment, the mineral powder fills gaps among the aggregates, so that the compactness of the vegetation concrete is further improved.

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.

Claims

1. The green high-performance concrete is characterized by comprising the following raw materials in parts by weight:

and (3) regenerating coarse aggregate: 1010 and 1290 parts;

regenerating fine aggregate: 540-680 parts;

cement: 230-360 parts;

high-efficiency air-entraining water reducing agent: 1-2 parts;

mineral powder: 20-35 parts;

water: 110-180 parts;

the mineral powder is a powdery solid formed by processing waste baked bricks, and the recycled coarse aggregate and the recycled fine aggregate are prepared from waste concrete through the following pretreatment steps:

screening: screening the waste concrete block c, wherein particles with the particle size range of 5-25mm are primary selected recycled coarse aggregates, and particles with the particle size range of less than 5mm are primary selected recycled fine aggregates;

glue dipping: respectively soaking the primary selected recycled coarse aggregate and the primary selected recycled fine aggregate into the epoxy resin glue in a stirring state for 5-7 h;

2. The green high-performance concrete according to claim 1, wherein: the recycled coarse aggregate and the recycled fine aggregate are both continuously graded.

3. The green high-performance concrete according to claim 1, wherein: in the temperature difference crushing step, the temperature range of the high-temperature baking is 180-230 ℃.

4. The green high-performance concrete according to claim 1, wherein: in the glue dipping step, polypropylene fibers are dispersed in the epoxy resin glue.

5. The green high-performance concrete according to claim 4, wherein: the polypropylene fiber is in nanometer level and the length is less than 1 mm.

6. The green high-performance concrete according to claim 4, wherein the concrete is prepared from a mixture of a mineral acid and a mineral acidThe method comprises the following steps: the content of the polypropylene fiber in the glue is 0.03-0.05kg/m³。

7. The green high-performance concrete according to claim 1, wherein: the particle size of the mineral powder is 20-60 mu m.

8. A preparation method of green high-performance concrete is characterized by comprising the following steps: the method comprises the following steps: