CN114262182B - Modified volcanic rock bio-based ecological concrete and preparation method thereof - Google Patents

Abstract

The invention discloses a modified volcanic rock bio-based ecological concrete which is prepared from the following raw materials in parts by weight: 100 parts of cement, 400 parts of volcanic rock 370-doped material, 5-6 parts of fly ash, 8-10 parts of additive, 3-5 parts of admixture, 0.8-1.5 parts of chopped fiber, 30-33 parts of water and 1-1.3 parts of polycarboxylic acid water reducing agent. By adding materials such as fibers and the like, the strength of the concrete is improved, the problem of insufficient strength of ecological concrete is solved, the ecological concrete has a porous physical purification effect, the biological purification effect is fully exerted, and the water purification effect is greatly improved.

Description

Modified volcanic rock bio-based ecological concrete and preparation method thereof

Technical Field

The invention relates to the technical field of ecological concrete, in particular to modified volcanic rock bio-based ecological concrete and a preparation method thereof.

Background

Rivers are the main sources of water for human production and living, play an important role in the development of cities and countryside and the construction of landscape ecology, and are also the main acceptors for sewage discharge in cities and countryside. With the rapid advance of industrialization and urbanization in China, the discharge amount of urban and rural domestic sewage, agricultural sewage and industrial sewage discharged into rivers and lakes increases year by year, and factories and chemical enterprises along the banks of rivers are staggered with drinking water sources, so that the water environment problem is increasingly prominent. In addition, the urban and rural sewage treatment rate is relatively low in China, a large amount of sewage which does not reach the standard is discharged into rivers and lakes, the deterioration of water quality is aggravated, and even seasonal or annual black and odorous phenomena occur in partial water areas. Nowadays, the problem of water environment becomes a key factor hindering sustainable development of China, the nation pays more attention to ecological environment protection, the increasingly serious problem of water pollution is brought up to a agenda, environment-friendly ecological materials are gradually favored by people, and the application of bioremediation technology to environmental management is a great trend in the future.

Ordinary concrete bank protection has the characteristics that the structure is closely knit, intensity is high, is favorable to the security of bank protection, but is unfavorable for the energy exchange of river course water and bank protection, can't carry out corresponding quality of water purification effect through bank protection and microorganism to lead to the decline of water self-purification ability. The ecological concrete is a novel concrete with a special pore structure, which is developed by adopting special raw materials and a preparation process, and the special pore structure of the ecological concrete enables the ecological concrete to have a larger specific surface area and higher porosity, so that the ecological concrete has good adsorption and filtration capacities. The special pore structure of the ecological concrete not only can effectively filter and adsorb pollutants, but also provides necessary growth conditions for the growth of plants and microorganisms, a layer of biological membrane is formed on the surface and inside of the ecological concrete, the purpose of improving water quality is achieved through the synergistic effect of various microorganisms on the biological membrane, and the improvement of the biological diversity of a water body and the improvement of an ecological system are facilitated. To a certain extent, the ecological concrete can reduce environmental pollution and can be coordinately developed with the ecological environment, so that the development of the ecological concrete has great application value.

A great deal of research is carried out on the aspect of purifying water quality by ecological concrete at home and abroad, a plug-flow type water purifying device is designed by utilizing the ecological concrete as a material in Chenshishan, the device has good treatment effect on domestic sewage, and the effluent index meets the requirement of the national specified discharge standard of a municipal secondary sewage treatment plant; jirongping et al studied the effect of ecological concrete on water quality improvement in water source areas of Taihu Meilianwan, and the study showed that: the removal rate of total nitrogen, total phosphorus, total algal toxin and extracellular algal toxin is high; the pilot-scale simulated riverway is constructed by applying the ecological concrete prefabricated spherical cannon block, the platy block and the four-ball conjoined cannon block by chenyanghi and the like, and the results show that the removal effect of the three ecological concrete revetment riverways on the nitrogen-containing compounds in the raw water of the Huangpu river is obvious.

The applicant carries out a great deal of research on volcanic rock ecological concrete and water purification performance thereof in the early period, finds that the volcanic rock based ecological concrete has great potential in the aspect of ecological cycle water purification, but the strength of the concrete still has great room for improvement. In addition, although the research on the ecological concrete in China has been progressed, on one hand, many problems exist in the aspects of raw material selection, mixing ratio design, forming process, durability and the like, on the other hand, the aim of purifying water quality is achieved only by depending on the porous structure of the ecological concrete, and the effect is limited.

Disclosure of Invention

In view of this, the present invention aims to provide a modified volcanic rock bio-based ecological concrete, which improves the strength of the concrete by modifying volcanic rock and adding materials such as fiber, solves the problem of insufficient strength of the ecological concrete, has a porous physical purification effect, fully exerts the biological purification effect, and greatly improves the water purification effect.

In order to achieve the purpose, the invention adopts the following technical scheme:

the modified volcanic rock bio-based ecological concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 400 parts of volcanic rock 370-doped silica, 5-6 parts of fly ash, 8-10 parts of an additive, 3-5 parts of an admixture, 0.8-1.5 parts of chopped fibers, 30-33 parts of water and 1-1.3 parts of a polycarboxylic acid water reducing agent.

Further, the admixture is carboxymethyl cellulose, triethanolamine and polyvinyl alcohol according to a weight ratio of 2: 1: 1 are mixed.

Further, the volcanic rock is subjected to modification treatment, and the specific modification method comprises the following steps:

(1) crushing and washing the vesuvianite, naturally drying in the air, and screening the particle size;

(2) blast furnace slag and fly ash are mixed according to the weight ratio of 1: 1 mixing the raw materials, adding water to prepare 20wt% slurry, and mixing

Soaking the vesuvianite in the slurry, stirring for 1.5h, filtering, standing, and controlling water for 2 h;

(3) dissolving polyvinyl alcohol in hot water, adding EVA emulsion, stirring uniformly, adding montmorillonite and nano calcium carbonate, stirring uniformly to form 5-8wt% modified solution, soaking the volcanic rock obtained in the step (2) in the modified solution for 2h, and air-drying to obtain modified volcanic rock; the weight ratio of the polyvinyl alcohol to the EVA emulsion to the montmorillonite to the nano calcium carbonate is 1: 1: 0.5-0.8: 0.1.

further, mixing the vesuvianite and the rice husk ash according to the weight ratio of 1: stirring and mixing for 30min at 0.1, wherein the grain diameter of the rice hull ash is less than or equal to 20 mu m.

Furthermore, the particle size of the vesuvianite is classified into 25-30cm accounting for 50 percent, and 30-35cm accounting for 50 percent.

Further, the chopped fibers are basalt fibers, steel fibers and polyvinyl alcohol fibers in a weight ratio of 2: 1: 1 are mixed.

Further, the length of the basalt fiber is 10-15mm, and the diameter of the basalt fiber is 10-15 μm; the diameter of the polyvinyl alcohol fiber is 10-12 μm, and the length is 5-8 mm; the diameter of the steel fiber is 0.2mm, and the length is 6-10 mm.

Further, the additive is diatomite and red loam according to the weight ratio of 0.5:1 are mixed.

A preparation method of volcanic rock bio-based ecological concrete comprises the following steps:

(1) mixing and stirring cement and chopped fibers for 150s, and simultaneously uniformly mixing the volcanic rock and 50% of water;

(2) then mixing and stirring the mixed cement and aggregate for 60s, then adding the fly ash, the additive and the admixture, fully stirring and mixing, and finally adding water and the polycarboxylic acid water reducing agent;

(3) pouring into a grinding tool for casting and molding.

The invention has the beneficial effects that:

1. the aggregate that the ecological concrete of this application preparation adopted is Yunnan tengchong volcanic rock, can fully realize the rational utilization of resource and ecological protection's theory, and the inside hole of volcanic rock is many moreover, helps the water to purify, but its intensity is low, and the breakage rate is high moreover, therefore the applicant mainly carries out all-round optimization improvement to the intensity of volcanic rock, concrete intensity and ecological concrete water purification effect.

2. The method has two functions of treating the surface of the volcanic rock, namely reducing the surface gap and cracks of the volcanic rock so as to increase the strength, enhancing the interface strength between the volcanic rock and cement, and fully considering the construction convenience and the construction cost during treatment due to the large using amount of the aggregate.

Firstly, the aggregate is soaked in blast furnace slag and fly ash slurry, wherein slag micro powder and fly ash are coated in gaps on the surface of the aggregate, so that the structure of the aggregate is enhanced in the hydration process, and the crushing value is reduced; controlling water to reduce the surface moisture of the aggregate, further soaking the aggregate in a modification solution, wherein the main components of the modification solution are polyvinyl alcohol and EVA emulsion, the polyvinyl alcohol and EVA emulsion is coated on the aggregate and the surfaces of slag micropowder and fly ash hydration products on the surface of the aggregate and is bonded to form a film, montmorillonite and nano calcium carbonate are also added into the modification solution, wherein the montmorillonite has strong cohesiveness, adsorptivity and thixotropy, the specific surface area of the montmorillonite is large, the permeability is strong, and on one hand, the gaps of the aggregate can be further strengthened; on the other hand, the montmorillonite and the nano calcium carbonate are dispersed in the modification liquid, so that the cohesion of the system can be effectively enhanced, and the bonding strength between the film and the aggregate is enhanced. In addition, the polyvinyl alcohol and EVA emulsion film has strong hydrophilicity, and can also enhance the binding force between the aggregate and the cement in cement hydration engineering. The method adopts a two-step treatment process for aggregate vesuvianite, and the first step is to repair surface gaps and strengthen strength; the second part is further impregnated and infiltrated, the repair is strengthened, in addition, the bonding strength of the aggregate at the later stage can be greatly increased, the construction is simple and easy to operate, and the cost is relatively low.

3. The ecological concrete has higher porosity and the strength of the ecological concrete is the strength of bonding contact points among aggregates; therefore, in order to improve the bonding strength of the cement, composite fibers, polyvinyl alcohol fibers, basalt fibers and steel fibers are added into cement paste, and the three fibers have different dispersivity in the cement, so that a complex network structure is formed, and the effect of enhancing and toughening is achieved; moreover, the polyvinyl alcohol fiber belongs to polymer fiber and can be lapped on the interface of cement and aggregate to play a role in enhancing and tackifying; the steel fiber has rough surface, high strength, large contact area with cement and strong impermeability, and is compounded with the basalt fiber, so that the early and later strength of the aggregate bonding point is greatly increased.

4. The cement is added with the admixture which is a mixture of carboxymethyl cellulose, triethanolamine and polyvinyl alcohol, wherein the carboxymethyl cellulose can improve the binding property and water retention property of the concrete slurry on one hand, and on the other hand, the admixture, the triethanolamine and the polyvinyl alcohol can be self-crosslinked or mutually crosslinked with a hydrophilic film on the surface of aggregate under the action of cations in the cement hydration process, thereby being beneficial to improving the binding effect of the aggregate.

5. In order to increase the ecological water purification effect of the application, the modified vesuvianite and the rice hull ash are fully mixed according to a certain proportion, most of the rice hull ash enters the vesuvianite and is adsorbed on the surface of the vesuvianite in a small amount, the nitrogen adsorption ratio of the rice hull ash is higher than that of a common material, and is 50-60 m/g, so that pollution is removed, microorganism nutrition can be provided, fine particles are enabled to fill pores, the nutrition of microorganisms and the attachment of pollutants are provided, the thickness of a biological membrane is increased, the nutrition of ground objects such as moss is increased, a good biological circulation circle is guaranteed, and the water purification efficiency and sustainability are promoted.

6. In addition, the additive is added into the raw materials, the diatomite and the laterite are composite materials, the diatomite is formed by corrosion and deterioration of seaweed cell walls and can provide nutrition for microorganisms, and the laterite contains a certain amount of microorganisms, so that the composite additive can increase the attachment thickness of a microbial film.

Detailed Description

The present invention will be further described with reference to the following examples.

Example 1

The modified volcanic rock bio-based ecological concrete is prepared from the following raw materials in parts by weight: 100 parts of 42.5 parts of cement, 370 parts of volcanic rock, 5 parts of fly ash, 8 parts of an additive, 3 parts of an admixture, 0.8 part of chopped fiber, 30 parts of water and 1 part of a polycarboxylic acid water reducing agent.

Wherein the admixture is carboxymethyl cellulose, triethanolamine and polyvinyl alcohol according to the weight ratio of 2: 1: 1 by mixing.

The volcanic rock is subjected to surface modification treatment, and the modification method comprises the following steps:

(1) crushing and washing the vesuvianite, naturally drying in the air, and screening the particle size, wherein the specific particle size is 25-30cm in percentage to 50%, and 30-35cm in percentage to 50%;

(2) blast furnace slag and fly ash are mixed according to the weight ratio of 1: 1 mixing the raw materials, adding water to prepare 20wt% slurry, and mixing

Soaking the vesuvianite in the slurry, stirring for 1.5h, filtering, standing, and controlling water for 2 h;

(3) dissolving polyvinyl alcohol in hot water, adding EVA emulsion, stirring uniformly, adding montmorillonite and nano calcium carbonate, stirring uniformly to form 5wt% of modified liquid (the weight ratio of the total amount of the polyvinyl alcohol, the EVA emulsion, the montmorillonite and the nano calcium carbonate to the modified liquid), soaking the volcanic rock obtained in the step (2) in the modified liquid for 2 hours, and air-drying to obtain the modified volcanic rock; the polyvinyl alcohol, the EVA emulsion, the montmorillonite and the nano calcium carbonate are mixed according to the weight ratio of 1: 1: 0.5: 0.1.

mixing the surface-modified vesuvianite with the rice husk ash according to the weight ratio of 1: 0.1 mixing and stirring for 20-30min, wherein the grain diameter of the rice hull ash is less than or equal to 20 mu m, and mixing for later use.

Wherein the chopped fibers are basalt fibers, steel fibers and polyvinyl alcohol fibers in a weight ratio of 2: 1: 1, mixing; the length of the basalt fiber is 10-15mm, and the diameter is 10-15 μm; the diameter of the polyvinyl alcohol fiber is 10-12 μm, and the length is 5-8 mm; the diameter of the steel fiber is 0.2mm, and the length is 6-10 mm; the additive is formed by mixing diatomite and laterite according to the weight ratio of 0.5: 1.

A preparation method of modified volcanic rock bio-based ecological concrete comprises the following steps:

(1) mixing and stirring cement and chopped fibers for 150s, and simultaneously uniformly mixing the volcanic rock and 50% of water;

(2) then mixing and stirring the mixed cement and aggregate for 60s, then adding the fly ash, the additive and the admixture, fully stirring and mixing, and finally adding water and the polycarboxylic acid water reducing agent;

(3) pouring into a grinding tool for casting.

Example 2

The modified volcanic rock bio-based ecological concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 380 parts of volcanic rock, 5.2 parts of fly ash, 8.5 parts of additive, 3.5 parts of admixture, 0.9 part of chopped fiber, 31 parts of water and 1.1 parts of polycarboxylic acid water reducing agent.

Wherein the admixture is carboxymethyl cellulose, triethanolamine and polyvinyl alcohol according to the weight ratio of 2: 1: 1 are mixed.

The volcanic rock is subjected to surface modification treatment, and the modification method comprises the following steps:

(1) crushing and washing the vesuvianite, naturally drying in the air, and screening the particle size, wherein the grain size of the vesuvianite is classified into 25-30cm in percentage to 50%, and 30-35cm in percentage to 50%;

(2) blast furnace slag and fly ash are mixed according to the weight ratio of 1: 1 mixing the raw materials, adding water to prepare 20wt% slurry, and mixing

Soaking the vesuvianite in the slurry, stirring for 1.5h, filtering, standing, and controlling water for 2 h;

(3) dissolving polyvinyl alcohol in hot water, adding EVA emulsion, stirring uniformly, adding montmorillonite and nano calcium carbonate, stirring uniformly to form 6wt% modified solution, soaking the volcanic rock obtained in the step (2) in the modified solution for 2 hours, and air-drying to obtain modified volcanic rock; the polyvinyl alcohol, the EVA emulsion, the montmorillonite and the nano calcium carbonate are mixed according to the weight ratio of 1: 1: 0.6: 0.1.

mixing the surface-modified vesuvianite and the rice hull ash according to the weight ratio of 1: 0.1 mixing and stirring for 20-30min, wherein the grain diameter of the rice hull ash is less than or equal to 20 mu m, and mixing for later use.

Other raw materials and processes were the same as in example 1.

Example 3

The modified volcanic rock bio-based ecological concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 390 parts of volcanic rock, 5.5 parts of fly ash, 9 parts of additive, 4 parts of admixture, 1.0 part of chopped fiber, 32 parts of water and 1.2 parts of polycarboxylic acid water reducing agent.

Wherein the admixture is carboxymethyl cellulose, triethanolamine and polyvinyl alcohol according to the weight ratio of 2: 1: 1 are mixed.

The volcanic rock is subjected to surface modification treatment, and the modification method comprises the following steps:

(1) crushing and washing the vesuvianite, naturally drying in the air, and screening the particle size, wherein the grain size of the vesuvianite is classified into 25-30cm accounting for 50% and 30-35cm accounting for 50%;

(2) blast furnace slag and fly ash are mixed according to the weight ratio of 1: 1 mixing the raw materials, adding water to prepare 20wt% slurry, and mixing

Soaking the vesuvianite in the slurry, stirring for 1.5h, filtering, standing, and controlling water for 2 h;

(3) dissolving polyvinyl alcohol in hot water, adding EVA emulsion, stirring uniformly, adding montmorillonite and nano calcium carbonate, stirring uniformly to form 7wt% modified solution, soaking the volcanic rock obtained in the step (2) in the modified solution for 2 hours, and air-drying to obtain modified volcanic rock; the polyvinyl alcohol, the EVA emulsion, the montmorillonite and the nano calcium carbonate are mixed according to the weight ratio of 1: 1: 0.7: 0.1.

mixing the surface-modified vesuvianite and the rice hull ash according to the weight ratio of 1: 0.1 mixing and stirring for 20-30min, wherein the grain diameter of the rice hull ash is less than or equal to 20 mu m, and mixing for later use.

Other raw materials and processes were the same as in example 1.

Example 4

The modified volcanic rock bio-based ecological concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 395 parts of volcanic rock, 5.8 parts of fly ash, 9.5 parts of an additive, 4.5 parts of an admixture, 1.2 parts of chopped fiber, 33 parts of water and 1.3 parts of a polycarboxylic acid water reducing agent.

Wherein the admixture is carboxymethyl cellulose, triethanolamine and polyvinyl alcohol according to the weight ratio of 2: 1: 1 are mixed.

The volcanic rock is subjected to surface modification treatment, and the modification method comprises the following steps:

(1) crushing and washing the vesuvianite, naturally drying in the air, and screening the particle size, wherein the grain size of the vesuvianite is classified into 25-30cm accounting for 50% and 30-35cm accounting for 50%;

(2) blast furnace slag and fly ash are mixed according to the weight ratio of 1: 1 mixing the raw materials, adding water to prepare 20wt% slurry, and mixing

Soaking the vesuvianite in the slurry, stirring for 1.5h, filtering, standing, and controlling water for 2 h;

(3) dissolving polyvinyl alcohol in hot water, adding EVA emulsion, stirring uniformly, adding montmorillonite and nano calcium carbonate, stirring uniformly to form 8wt% modified solution, soaking the volcanic rock obtained in the step (2) in the modified solution for 2 hours, and air-drying to obtain modified volcanic rock; the polyvinyl alcohol, the EVA emulsion, the montmorillonite and the nano calcium carbonate are mixed according to the weight ratio of 1: 1: 0.75: 0.1.

mixing the surface-modified vesuvianite and the rice hull ash according to the weight ratio of 1: 0.1 mixing for 20-30min, wherein the grain diameter of the rice hull ash is less than or equal to 20 μm, and mixing for later use.

Other raw materials and processes were the same as in example 1.

Example 5

The modified volcanic rock bio-based ecological concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 400 parts of volcanic rock, 6 parts of fly ash, 10 parts of an additive, 5 parts of an admixture, 1.5 parts of chopped fiber, 32 parts of water and 1.2 parts of a polycarboxylic acid water reducing agent.

Wherein the admixture is carboxymethyl cellulose, triethanolamine and polyvinyl alcohol according to the weight ratio of 2: 1: 1 are mixed.

The volcanic rock is subjected to surface modification treatment, and the modification method comprises the following steps:

(1) crushing and washing the vesuvianite, naturally drying in the air, and screening the particle size, wherein the grain size of the vesuvianite is classified into 25-30cm accounting for 50% and 30-35cm accounting for 50%;

(2) blast furnace slag and fly ash are mixed according to the weight ratio of 1: 1 mixing the raw materials, adding water to prepare 20wt% slurry, and mixing

Soaking the vesuvianite in the slurry, stirring for 1.5h, filtering, standing and controlling water for 2 h;

(3) dissolving polyvinyl alcohol in hot water, adding EVA emulsion, stirring uniformly, adding montmorillonite and nano calcium carbonate, stirring uniformly to form 8wt% modified solution, soaking the volcanic rock obtained in the step (2) in the modified solution for 2 hours, and air-drying to obtain modified volcanic rock; the polyvinyl alcohol, the EVA emulsion, the montmorillonite and the nano calcium carbonate are mixed according to the weight ratio of 1: 1: 0.8: 0.1.

mixing the surface-modified vesuvianite and the rice hull ash according to the weight ratio of 1: 0.1 mixing for 20-30min, wherein the grain diameter of the rice hull ash is less than or equal to 20 μm, and mixing for later use.

Other raw materials and processes were the same as in example 1.

Comparative example 1

Comparative example 1 differs from example 5 in that: the modified vesuvianite is not mixed with rice hull ash.

Comparative example 2

Comparative example 2 differs from example 5 in that: the volcanic rock is not modified, and the unmodified volcanic rock is mixed with rice hull ash.

Performance detection

Ecological concrete test blocks with standard sizes of 150 x 150mm are respectively prepared from the ecological concrete in the examples 1-5, the ecological concrete test blocks are maintained to 28d in a standard way, and the compressive strength, the porosity and the water purification performance are detected.

Wherein the water purification performance is divided into static adsorption experiment and dynamic water passing experiment

Static adsorption experiment: placing seven groups of test blocks with the size of 150 × 150mm into seven drums filled with sewage respectively, placing the test drums below indoor windowsills, keeping windows fully open, detecting the total nitrogen content, the CODcr content and the total phosphorus concentration before and after the test respectively, and calculating the average removal rate, wherein the test time is 720 h;

dynamic water passing test: the dynamic water passing tests are carried out in the examples 1-5 and the comparative examples 1-2, each group of three test blocks of 150 × 120mm is uniformly fixed in a flow groove which is obliquely arranged, the vertical height of the flow groove is 1.0m, sewage is lifted to a high-level water tank through a centrifugal pump, flows through a rectifying plate and then uniformly enters the flow groove in a gravity flow mode, flows downwards step by step and circularly flows in the flow groove, the test time is 720h, the total nitrogen, CODcr content and total phosphorus concentration at the water outlet of the flow groove before and after the test are detected, and the removal rate is calculated.

TABLE 1 Performance test results

As can be seen from Table 1, the compressive strength of the ecological concrete prepared by the method is 12-13.1MPa, the dynamic adsorption of the ecological concrete on total nitrogen can reach 82-89%, the COD is 90-99%, the total phosphorus is 79.9-90%, the removal rate of nitrogen, phosphorus and COD is high, the strength is high, and the service life is long.

Comparative example 1 is based on example 5, the modified vesuvianite is not mixed with rice hull ash, the porosity and the strength of the vesuvianite are not greatly different from example 5, but the static adsorption and the dynamic adsorption performance of the vesuvianite are lower than those of example 5, and the addition of the rice hull ash has certain promotion effect on water purification performance, but has little influence on the strength. The difference between the comparative example 2 and the example 5 is that the volcanic rock is not modified, the strength of the test block is obviously reduced, and in addition, the adsorption performance of the volcanic rock is slightly lower than that of the volcanic rock in the example 5, which shows that the modification treatment has great influence on the strength of the concrete and has certain influence on the adsorption performance.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims (4)

1. The modified volcanic rock bio-based ecological concrete is characterized in that: the feed is prepared from the following raw materials in parts by weight: 100 parts of cement, 400 parts of volcanic 370-doped material, 5-6 parts of fly ash, 8-10 parts of additive, 3-5 parts of admixture, 0.8-1.5 parts of chopped fiber, 30-33 parts of water and 1-1.3 parts of polycarboxylic acid water reducer;

the admixture is prepared from carboxymethyl cellulose, triethanolamine and polyvinyl alcohol according to a weight ratio of 2: 1: 1, mixing;

the volcanic rock is subjected to modification treatment, and the specific modification method comprises the following steps:

(1) crushing and washing the vesuvianite, naturally drying in the air, and screening the particle size;

(2) blast furnace slag and fly ash are mixed according to the weight ratio of 1: 1 mixing the raw materials, adding water to prepare 20wt% slurry, and mixing

Soaking the vesuvianite in the slurry, stirring for 1.5h, filtering, standing, and controlling water for 2 h;

(3) dissolving polyvinyl alcohol in hot water, adding EVA emulsion, stirring uniformly, adding montmorillonite and nano calcium carbonate, stirring uniformly to form 5-8wt% modified solution, soaking the volcanic rock obtained in the step (2) in the modified solution for 2h, and air-drying to obtain modified volcanic rock; the weight ratio of the polyvinyl alcohol to the EVA emulsion to the montmorillonite to the nano calcium carbonate is 1: 1: 0.5-0.8: 0.1;

mixing modified vesuvianite and rice hull ash according to a weight ratio of 1: stirring and mixing for 30min at 0.1, wherein the grain size of the rice hull ash is less than or equal to 20 mu m;

the chopped fibers are basalt fibers, steel fibers and polyvinyl alcohol fibers in a weight ratio of 2: 1: 1, mixing;

the additive is diatomite and red loam according to the weight ratio of 0.5:1 are mixed.

2. The modified volcanic rock bio-based ecological concrete as claimed in claim 1, wherein the modified volcanic rock bio-based ecological concrete is characterized in that: the particle size of the vesuvianite is divided into 50% of 25-30cm and 50% of 30-35 cm.

3. The modified volcanic rock bio-based ecological concrete according to claim 1, wherein the modified volcanic rock bio-based ecological concrete comprises: the length of the basalt fiber is 10-15mm, and the diameter of the basalt fiber is 10-15 mu m; the diameter of the polyvinyl alcohol fiber is 10-12 μm, and the length is 5-8 mm; the diameter of the steel fiber is 0.2mm, and the length is 6-10 mm.

4. The preparation method of the modified volcanic rock bio-based ecological concrete of claim 1, which is characterized by comprising the following steps: the method comprises the following steps:

(1) mixing and stirring cement and chopped fibers for 150s, and simultaneously uniformly mixing the volcanic rock and 50% of water;

(2) then mixing and stirring the mixed cement and aggregate for 60s, then adding the fly ash, the additive and the admixture, fully stirring and mixing, and finally adding water and the polycarboxylic acid water reducing agent;

(3) pouring into a mould for casting.