CN114835457B

CN114835457B - Ultra-high toughness mixture regenerated by waste combined micro powder and preparation method thereof

Info

Publication number: CN114835457B
Application number: CN202210616171.1A
Authority: CN
Inventors: 程站起; 闫文豪; 李浩楠; 郜成聪; 张文更; 王开闯; 刘人龙; 王珮莹; 张惜洪; 王世可
Original assignee: Zhengzhou University
Current assignee: Zhengzhou University
Priority date: 2022-06-01
Filing date: 2022-06-01
Publication date: 2023-05-26
Anticipated expiration: 2042-06-01
Also published as: CN114835457A

Abstract

The invention discloses a waste combined micro powder regenerated ultra-high toughness mixture and a preparation method thereof, and belongs to the technical field of solid waste recycling of buildings. The raw materials of the waste combined micro powder regenerated ultra-high toughness mixture per cubic meter comprise: 360-390kg of water, 230-265kg of cement, 90-120kg of regenerated glass powder, 870-920kg of fly ash, 160-200kg of regenerated brick powder, 160-200kg of regenerated concrete powder, 19.4kg of PE fiber, 0.9-1.3kg of water reducer and 0.3-0.4kg of thickener. According to the invention, the cementing material and the fine aggregate in the ECC raw material are replaced by the regenerated combined micro powder, so that the recycling utilization of the construction waste is realized, the ECC production cost is greatly reduced, and meanwhile, the prepared waste combined micro powder regenerated ultra-high toughness mixture has high strength and strong toughness.

Description

Ultra-high toughness mixture regenerated by waste combined micro powder and preparation method thereof

Technical Field

The invention relates to the technical field of solid waste recycling of buildings, in particular to a waste combined micro powder regenerated ultra-high toughness mixture and a preparation method thereof.

Background

In recent years, as the level of urban construction continues to increase, a large amount of construction waste is produced each year, and at a remarkable rate. But the recovery rate of the construction waste resources is very low, a large amount of construction waste is sent to suburbs for stacking and landfill, and not only occupies a large area, but also causes environmental pollution. The sustainable development and green ecological environment protection of the current society are attracting more and more attention, and along with the continuous generation of the construction waste, advanced technology and technological measures are adopted to advance the reduction of the construction waste source, so that the establishment of a construction waste recycling system is urgent.

At present, the project construction of various scales is not separated from concrete materials, and the concrete materials have the advantages of good working performance, low cost, strong plasticity and the like; however, as building materials develop and building requirements increase, problems in terms of concrete strength, toughness and durability are increasingly revealed. Engineering cement-based composite materials (Engineered cementitious composites, ECC), also called ultra-high toughness cement-based composite materials or strain hardening cement-based materials, are novel building cement-based composite materials which are originally proposed by Li, and when the fiber volume doping amount is about 2%, the ultimate tensile strain energy can be stabilized to be more than 3%. The ECC base components mainly include cement, fine sand, admixtures, and fibers and additives, and their excellent properties have been confirmed by many researchers and have been used in engineering practice.

At present, the application of ECC is mainly focused on the aspects of rocker surface repair, bridge repair and reinforcement, and the research on replacing raw materials with building regenerated micro powder is still in the early stage.

Although the related researches on construction regeneration micro powder and ECC materials in the prior art are more, the defects and the shortcomings still exist: (1) In the prior art, the coarse aggregate prepared from the building regenerated micro powder is more researched in concrete, and the coarse aggregate is less researched in ECC materials. (2) In the prior art, the regenerated micro powder is used for replacing the raw materials in the ECC material, namely, one kind of building micro powder is used for replacing one kind of raw materials in the original mixing ratio, and a plurality of kinds of micro powder are not used for replacing a plurality of kinds of raw materials. (3) Cement and quartz sand in ECC materials are expensive, limiting the application of cement-based materials in engineering.

Disclosure of Invention

The invention aims to provide a waste combined micro powder regenerated ultra-high toughness mixture and a preparation method thereof. By replacing the cementing material and the fine aggregate in the ECC raw material with the regenerated combined micro powder, the recycling utilization of the construction waste is realized, the ECC production cost is greatly reduced, and meanwhile, the prepared waste combined micro powder regenerated ultra-high-toughness mixture has high strength and strong toughness.

In order to achieve the above purpose, the present invention provides the following technical solutions:

one of the technical schemes of the invention is as follows: the raw materials of the waste combined micro powder regenerated ultra-high toughness mixture per cubic meter comprise: 360-390kg of water, 230-265kg of cement, 90-120kg of regenerated glass powder, 870-920kg of fly ash, 160-200kg of regenerated brick powder, 160-200kg of regenerated concrete powder, 19.4kg of PE fiber, 0.9-1.3kg of water reducer and 0.3-0.4kg of thickener.

The PE fiber density was 0.97g/cm ³ The addition amount of PE fibers in the invention is 2% of the total volume of the ultra-high toughness mixture regenerated by the waste combined micro powder, and the PE fibers are added by weighing 19.4kg per cubic meter.

Preferably, the regenerated glass frit is an activated regenerated glass frit, and the method for activating the activity comprises the following steps: and (3) taking 0-75 mu m of regenerated glass powder, and ball milling for 45min to obtain the regenerated glass powder excited by the activity.

Preferably, the particle size of the regenerated brick powder is 60-180 mu m; the particle size of the regenerated concrete powder is 70-180 mu m.

Preferably, the cement is p.o52.5 portland cement.

Preferably, the fly ash is a primary fly ash.

Preferably, the water reducer is a polycarboxylic acid high-efficiency water reducer.

Preferably, the thickener is hydroxypropyl methylcellulose.

The second technical scheme of the invention is as follows: the preparation method of the waste combined micro powder regenerated ultra-high toughness mixture comprises the following steps:

mixing cement, regenerated glass, fly ash, regenerated brick powder and regenerated concrete powder uniformly, adding water, stirring, adding a water reducing agent and a thickening agent, continuously stirring to react materials, finally adding PE fibers, and stirring to obtain the waste combined micro powder regenerated ultra-high toughness mixture.

Preferably, the stirring is continued at a speed of 108r/min for a period of 2min.

Preferably, the PE fibers are stirred at a low speed in the adding process, and the stirring is switched to medium-speed stirring after all the PE fibers are added; the speed of the low-speed stirring is 108r/min; and the stirring time is 188r/min and is 4min.

The early low-speed stirring is used for uniformly mixing raw materials and fully reacting the water reducing agent, the thickening agent and the slurry; the fiber is added and stirred at medium speed, so that the fiber is fully dispersed in the slurry, and the phenomenon of fiber agglomeration is prevented.

The main component of the regenerated glass powder used in the invention is SiO ₂ Al and Al ₂ O ₃ And the like; the main mineral composition of the regenerated brick powder is SiO ₂ Feldspar and hematite; the main mineral phase of the recycled concrete powder is calcite (CaCO) ₃ )、SiO ₂ Hydration product calcium hydroxide Ca (OH) ₂ . Wherein the regenerated brick powder and the regenerated glass powder have SiO with certain volcanic ash activity ₂ . CaCO in the recycled concrete powder ₃ Can generate carboaluminate with cement hydration products, and is favorable for refining the pore structure of cement paste.

When the regenerated glass powder used in the invention is used for replacing cement, the aquatic products are correspondingly reduced due to the reduction of the consumption of cement, but at the moment, the regenerated brick powder and the SiO in the regenerated glass powder are regenerated ₂ Can be mixed with Ca (OH) in the recycled concrete powder ₂ The reaction is carried out to generate hydrated calcium silicate, hydration products generated by cement reduction amount are properly compensated, and the volcanic ash reaction equation is as follows: ca (OH) ₂ +SiO ₂ →(CaO)(SiO ₂ )(H ₂ O). And due to the reduction of hydration products, the binding force between the fiber and the matrix is properly reduced, and the tensile force of the fiber is reduced in the drawing process, so that the bridging effect of the fiber is better exerted, and the tensile resistance and the bending resistance of the concrete are effectively enhanced.

The beneficial technical effects of the invention are as follows:

the invention adopts various building solid waste micro powder to replace cementing materials and fine aggregates in ECC raw materials, opens up a new research direction for simultaneously replacing cement-based material components with various building solid waste micro powder, realizes that various micro powder jointly acts on ECC, greatly realizes recycling of building resources and improves environmental benefit.

The ECC raw material is replaced by the building solid waste micro powder, so that the energy consumption strength, the carbon emission and the production cost of the material are greatly reduced. When the recycled brick powder and the recycled concrete powder (1:1) are used for jointly and fully replacing quartz sand, the replacement rate of the recycled glass powder is 30 percent, and the total replacement rate is 1m ³ The energy consumption strength of the ECC is reduced by 21.5%, the carbon emission is reduced by 16.11%, the total cost price of the cementing material and the fine aggregate is reduced by 71.5%, and the production cost of the ECC is greatly reduced.

Drawings

FIG. 1 is a macroscopic view of a test piece prepared in example 1.

Fig. 2 is a schematic diagram of a dog bone specimen in a dog bone tensile property test.

Fig. 3 is a schematic representation of the placement of dog bone test pieces in a dog bone tensile property test.

Fig. 4 is a graph of tensile stress-strain curve of a test piece in a dog bone tensile property test.

FIG. 5 is a macroscopic view of a broken test piece in a dog bone tensile property test, wherein (a) is a reference group and (b) is a regenerated micro powder group.

FIG. 6 is a graph showing the characteristics of cracks after breaking a test piece in a dog bone tensile property test, wherein (a) is a reference group and (b) is a regenerated micro powder group.

FIG. 7 is a schematic illustration of the placement of a test piece in a four-point bending performance test.

FIG. 8 is a graph of bending load versus mid-span deflection of a test piece in a four-point bending performance test.

FIG. 9 is an SEM image of recycled brick powder of example 1 at 10000 Xmagnification.

FIG. 10 is an SEM image at 25000 magnification of the reclaimed tile powder used in example 1.

FIG. 11 is an SEM image at 40000 magnification of recycled concrete powder used in example 1.

FIG. 12 is an SEM image at 25000 magnification of the recycled concrete powder used in example 1.

FIG. 13 is an SEM image at a magnification of 50000 of the reclaimed glass powder used in example 1.

FIG. 14 is an SEM image at 25000 magnification of the regenerated glass frit used in example 1.

FIG. 15 is an SEM image at 20000 magnification of quartz sand used in example 1.

FIG. 16 is an SEM image at a magnification of 50000 of the quartz sand used in example 1.

Fig. 17 is an SEM image of the reference group test piece prepared in example 1 at 500 x magnification.

Fig. 18 is an SEM image of the reference group test piece prepared in example 1 at a magnification of 1000.

Fig. 19 is an SEM image of the reference group test piece prepared in example 1 at 2000 x magnification.

FIG. 20 is an SEM image at 500 times of a test piece of the regenerated fine powder group prepared in example 1.

FIG. 21 is an SEM image at 1000 times of the test piece of the regenerated fine powder group prepared in example 1.

FIG. 22 is an SEM image at 2000 x magnification of test pieces of the regenerated fine powder group prepared in example 1.

Detailed Description

Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention.

As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.

The cement used in the examples and comparative examples of the present invention was p.o52.5 portland cement; the fly ash is first-grade fly ash; the PE fibers used had a diameter of 24. Mu.m, a length of 18mm and a density of 0.97g/cm ^-3 The elastic modulus is 116GPa, the tensile strength is 3MPa, and the elongation at break is 1-3%; the water reducer is a polycarboxylic acid high-efficiency water reducer, and the water reducing rate is more than 30%; the thickener is hydroxypropyl methyl cellulose with the viscosity grade of 20 ten thousand; the water is clean and pollution-free tap water; the grain diameter of the quartz sand is 120-180 mu m;

the preparation steps of the used regenerated brick powder, regenerated concrete powder and regenerated glass powder are as follows:

(1) Waste bricks, waste concrete and waste glass in the construction waste are sorted, dried in the sun and then primarily crushed into fine particles with the diameter of 3-7mm by using a jaw crusher.

(2) Ball milling is carried out on three building waste particles in an SM 500X 500 type ball mill, the ball milling time of waste brick powder is 5min, the ball milling time of waste concrete is 10min, and the regenerated brick powder and the regenerated concrete powder which are the same as the grain size section of the fine aggregate quartz sand are sieved by a standard sieve.

(3) The ball milling time of the waste glass is 10min, and then the regenerated glass powder with the particle size of 0-75 μm is obtained by sun-drying with a standard sieve.

(4) And (3) performing activity excitation on the regenerated glass powder with the particle size of 0-75 μm by adopting a physical ball milling excitation mode (ball milling for 45 min).

Example 1

Preparation of test pieces:

preparing each raw material for preparing an ECC test piece (reference group) and a waste combined micro powder regenerated ultra-high toughness mixture test piece (regenerated micro powder group) according to the proportion of the table 1;

TABLE 1ECC and waste combination micropowder regenerated ultra-high toughness mixture blending ratio (kg/m) ³ )

Test pieces were prepared using a B20 intensive mixer:

(1) Firstly, a stirring barrel and stirring blades are wetted by towels, so that no water exists in the barrel and the wall of the barrel is moist;

(2) Sequentially adding cement (cement and regenerated glass powder), fly ash and quartz sand (regenerated brick powder and regenerated concrete powder) into a stirring barrel, and stirring at a low speed (108 r/min) for 3min to ensure uniform mixing of materials;

(3) Slowly pouring water into a stirring barrel, sequentially adding a water reducing agent and a thickening agent, and stirring at a low speed (108 r/min) for 2min to enable the water reducing agent and the thickening agent to fully react with the slurry;

(4) Slowly adding PE fibers into a barrel, stirring at a low speed (108 r/min) in the process of adding the fibers, adding all the fibers into the barrel, switching to a medium speed (188 r/min), and stirring for 4min to obtain a pouring material;

(5) All test blocks are poured twice, firstly, half materials of the test blocks are filled, the test blocks are vibrated for 60 seconds, then the rest materials are filled, the test blocks are vibrated for 60 seconds again, and vibrating bars are used for vibrating during the two times of vibration to remove internal bubbles in the materials, so that the materials are more compact. Then, the redundant materials on the surface of the test block are leveled by a spatula, and a PE preservative film is covered to prevent water evaporation, and the obtained test block is shown in figure 1;

(6) And (3) placing the test block at room temperature for 24 hours, removing the die, and then placing the test block into a constant temperature and constant humidity curing box (the temperature is 20+/-1 ℃ and the humidity is more than or equal to 95%) for curing for 28 days to obtain the test piece.

The compressive strength of a test piece prepared from the casting material obtained in example 1 was measured:

the test equipment used was: a model YAW-200B pressure tester;

the method comprises the following steps: reference is made to specification astm c109, standard Test Method for Compressive ofHydraulic Cement Mortars. The prepared compression-resistant test blocks are 50mm multiplied by 50mm, 6 test blocks are loaded in groups at the loading speed of 0.9KN/s, the test blocks are continuously loaded until the test blocks are broken, and the breaking value is recorded. Calculating the compressive strength of the test piece according to the formula (1), wherein the calculation result is shown in Table 2;

in the formula (1), f _m,cu Compressive strength (MPa); n (N) _u Is the limit load (N); a is the pressure-bearing area (mm) of the test piece ² )。

Dog bone tensile properties test of test pieces prepared from casting materials obtained in example 1:

the test equipment used was: WDW-100 microcomputer controlled electronic universal tester (specification: 100 KN), DN3816N static stress strain system, LH-S05 tension sensor (measuring range: 5 KN) and YWC-10 strain displacement sensor (correction coefficient: 0.002 mm/. Mu. Epsilon.);

the method comprises the following steps: the dog bone specimen is sized with reference to Japanese related Specification (Japan Society ofCivil Engineers, JSCE 2008) with a 30mm by 13mm middle section and 80mm length, and as shown in FIG. 2, the shape feature can better concentrate crack damage and development in this area, and can better observe crack damage. The dog bone test piece was placed in a jig, a displacement meter and a displacement meter tray were fixed, and the machine speed was adjusted to 0.4mm/min for loading, as shown in fig. 3. And paying attention to the integral numerical trend change and the damage condition of the test piece in the loading process, stopping loading when the integral numerical trend is greatly reduced or a large-distance crack is formed on the surface of the test piece, storing data and returning the machine.

Processing the acquired load and displacement values, averaging the two displacement sensor values, and calculating the ultimate tensile strength sigma according to the formulas (2) and (3) _tu And ultimate tensile strain ε _tu And the characteristic values and the calculation results are shown in table 2.

In the formula (2), sigma is tensile stress (MPa); f is tensile load (N); s is the width (mm) of the test piece; t is the thickness (mm) of the test piece.

In the formula (3), ε is a tensile strain (%); l (L) ₀ Tensile elongation (mm); l is the length (mm) of the test section, and 120mm is taken.

From the measured results, a tensile stress-strain curve was plotted, and the resulting tensile stress-strain curve is shown in fig. 4.

As can be seen from fig. 4, the tensile test failure is mainly divided into three stages: an elastic phase, a strain hardening phase and a breaking phase. 1. In the test process, in the initial elastic stage of loading, a test load curve rises linearly; when the testing machine is increased to a certain load, a first crack appears in the test piece; 2. entering a strain hardening stage, under the bridging action of PE fibers, gradually generating a plurality of cracks on a dog bone stretching section of a test piece along with the continuous increase of load, wherein a stretching stress-strain curve fluctuates up and down, but the whole curve is in an ascending trend, and obvious strain hardening characteristics are shown; 3. the test piece cracks gradually increase, the test piece continuously bears force to enter a damage stage, the number of the cracks is not increased any more, the weakest section is gradually widened, the internal fibers are gradually pulled out and broken, the stress of the test piece is rapidly reduced, and the test piece is damaged.

The macroscopic view of the broken test piece in the dog bone tensile test is shown in fig. 5, wherein (a) is a reference group, and (b) is a regenerated micro powder group. As can be seen from fig. 5, the test piece failure zone is in the dog bone stretching section, and the number of cracks in the regenerated micro powder group is greater than that in the reference group in the same zone. The crack characteristics under the crack observer are shown in fig. 6, wherein (a) is a reference group, and (b) is a regenerated micro powder group, and specific crack numbers, average crack widths and average crack spacing are shown in table 2.

Four-point bending property test of test piece prepared from casting material obtained in example 1:

the test equipment used was: WDW-100 microcomputer controlled electronic universal tester (specification: 100 KN), DN3816N static stress strain system, LH-S10C pressure sensor (measuring range: 2 KN) and YWC-100 strain type displacement sensor (precision: 3 mill);

the method comprises the following steps: the four-point bent sheet has dimensions 320mm by 100mm by 10mm. Before the test, the surface of the test block is divided into interval lines, and a steel bar is adhered to the middle of the thin plate for placing a displacement meter to measure the midspan displacement. And then placing the test piece on a machine support, placing a bending fulcrum and a pressure sensor, and placing a displacement sensor. The test piece was loaded by adjusting the loading rate to 0.5mm/min as shown in FIG. 7. And paying attention to the integral numerical trend change and the damage condition of the test piece in the loading process, stopping loading when the integral numerical trend is greatly reduced or a large-distance crack is formed at the bottom of the test block, storing data and returning the machine.

Processing the acquired load and displacement values, averaging the two displacement sensor values, and calculating the ultimate bending strength sigma according to formula (4) _u A characteristic value; the calculation results are shown in Table 2.

In formula (4), σ _u Is the ultimate flexural strength (MPa); p (P) _u Is the load (N) at the peak point of the load-deflection curve; s is the span (mm) of the test piece; b is the width (mm) of the test piece; h is the thickness (mm) of the test piece.

According to the measured results, a curve graph of bending load-mid-span deflection is drawn, and the curve graph of bending load-mid-span deflection is shown in fig. 8.

As can be seen from fig. 8, the sheet bending test piece can be divided into four stages during the stress process: an elastic phase, a yielding phase, a deformation hardening phase and a breaking phase. In the elastic stage, cement and fiber are stressed together, the load deflection curve of the cement and the fiber linearly grows, and the force born by the matrix is larger than the force born by the fiber until the first crack appears on the matrix; the material begins to generate plastic deformation in the yield stage, and cracks begin to appear gradually at the weak defect place of the sheet, and the load-mid-span deflection curve in the stage is not in direct proportion; the strain hardening stage is also called as a multi-slit cracking stage, and the fiber in the matrix plays a good bridging and cracking-resisting role along with the increase of load, so that a thin plate gradually generates a plurality of tiny cracks; when the thin plate is continuously stressed to enter a damage stage, the load deflection curve can be rapidly reduced, and the test piece loses bearing capacity to be damaged.

Table 2 results of measuring mechanical properties of reference group and regenerated fine powder group

As can be seen from Table 2, the compressive strength of the reference group was 42.3MPa, and the compressive strength of the regenerated fine powder group was 32.4MPa, which was lower than that of the reference group, but still satisfied the C30 concrete strength grade. The tensile property and the bending property of the regenerated micro powder group are greatly improved while the compressive strength is reduced, and the tensile strain energy of the regenerated micro powder group is 7.88 percent and is improved by 24.29 percent compared with a reference group. The bending limit deflection can reach 76.218mm, which is improved by 19.6% compared with the reference group.

Microscopic test of test pieces prepared from the raw materials used in example 1 and the resulting casting materials:

the test equipment used was: hitachi S-4800 type high resolution cold field emission scanning electron microscope (Hitachi, japan);

the method comprises the following steps: and (3) performing field emission Scanning Electron Microscope (SEM) test on the test blocks after the test pieces of the raw materials, the reference group and the regenerated micro powder group are destroyed, and analyzing the microscopic appearance of the test blocks. Before the experiment, the sample is dried in a vacuum drying oven at 50 ℃ for 1h, so that the reaction of the sample with moisture and carbon dioxide in the air is prevented.

An SEM image of 10000 times of regenerated brick powder is shown in FIG. 9, and an SEM image of 25000 times is shown in FIG. 10;

an SEM image of recycled concrete powder at 40000 magnification is shown in FIG. 11, and an SEM image at 25000 magnification is shown in FIG. 12;

an SEM image of the regenerated glass frit at 50000 x magnification is shown in FIG. 13, and an SEM image at 25000 x magnification is shown in FIG. 14;

an SEM image of the silica sand at 20000 x magnification is shown in fig. 15, and an SEM image at 50000 x magnification is shown in fig. 16.

As can be seen from fig. 9 to 16, the particle surfaces of the recycled brick powder and the recycled concrete powder are similar to the particle-shaped surfaces of the quartz sand, the surface layers thereof are prominent, the characteristics of the surface layers are uneven and the edges are irregular, and the natural advantages of replacing the quartz sand as the fine aggregate are achieved.

Reference group 500 x SEM is shown in figure 17, 1000 x SEM is shown in figure 18, 2000 x SEM is shown in figure 19;

the SEM image of the regenerated fine powder group at 500 times is shown in fig. 20, the SEM image at 1000 times is shown in fig. 21, and the SEM image at 2000 times is shown in fig. 22.

As can be seen from fig. 17-22, the reference group fiber has obvious breaking characteristics, the fiber breaking interface part generates obvious distortion, the reference group strength is higher, the bonding force between the fiber and the matrix is stronger, the fiber bears larger tensile force in the process of pulling out the fiber, the fiber self-damage is more serious, and the fiber cannot well play a bridging anti-cracking role; when the regenerated micro powder is used to replace quartz sand and part of cement, the breaking and pulling out features of the fiber coexist, and a large amount of hydration products are adhered to the surface of the fiber, and the proper phenomena of wire drawing and scratch are formed on the surface, so that the bridging effect of the fiber in the material matrix is fully exerted.

The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.

Claims

1. The waste combined micro powder regenerated ultra-high toughness mixture is characterized in that the raw materials of the waste combined micro powder regenerated ultra-high toughness mixture per cubic meter comprise: 360-390kg of water, 230-265kg of cement, 90-120kg of regenerated glass powder, 870-920kg of fly ash, 160-200kg of regenerated brick powder, 160-200kg of regenerated concrete powder, 19.4kg of PE fiber, 0.9-1.3kg of water reducer and 0.3-0.4kg of thickener;

the regenerated glass powder is regenerated glass powder excited by activity, and the method for exciting the activity comprises the following steps: taking 0-75 mu m regenerated glass powder, and ball milling for 45min to obtain active excited regenerated glass powder;

the particle size of the regenerated brick powder is 60-180 mu m; the particle size of the recycled concrete powder is 70-180 mu m;

the PE fiber has a diameter of 24 μm, a length of 18mm and a density of 0.97g/cm ^-3 The elastic modulus is 116GPa, the tensile strength is 3MPa, and the elongation at break is 1-3%.

2. The waste composite micro powder regenerated ultra-high toughness mixture according to claim 1, wherein the cement is p.o52.5 ordinary Portland cement.

3. The waste composite micro powder regenerated ultra-high toughness mixture according to claim 1, wherein the fly ash is first-class fly ash.

4. The waste combined micropowder regenerated ultra-high toughness mixture according to claim 1, wherein the water reducer is a polycarboxylic acid high efficiency water reducer.

5. The waste composite micro powder regenerated ultra-high toughness mixture according to claim 1, wherein the thickener is hydroxypropyl methylcellulose.

6. A method for preparing the waste combined micro powder regenerated ultra-high toughness mixture according to any one of claims 1 to 5, which is characterized by comprising the following steps:

mixing cement, regenerated glass powder, fly ash, regenerated brick powder and regenerated concrete powder uniformly, adding water, stirring, adding a water reducing agent and a thickening agent, continuously stirring to react materials, finally adding PE fibers, and stirring to obtain the waste combined micro-powder regenerated ultra-high toughness mixture.

7. The method of claim 6, wherein the stirring is continued at a speed of 108r/min for a period of 2min.

8. The method according to claim 6, wherein the PE fiber is stirred at a low speed during the addition, and the PE fiber is switched to a medium speed during the addition; the speed of the low-speed stirring is 108r/min; and the stirring time is 188r/min and is 4min.