CN108275936B - Reclaimed sand powder green concrete and preparation method thereof - Google Patents

Reclaimed sand powder green concrete and preparation method thereof Download PDF

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CN108275936B
CN108275936B CN201711481179.7A CN201711481179A CN108275936B CN 108275936 B CN108275936 B CN 108275936B CN 201711481179 A CN201711481179 A CN 201711481179A CN 108275936 B CN108275936 B CN 108275936B
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concrete
regenerated
sand powder
recycled
powder
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CN108275936A (en
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杨德志
刘琼
王栋民
崔素萍
刘泽
孙继成
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Shanghai Guotong Environmental Protection Equipment Co ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04Portland cements
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    • C04B2111/00017Aspects relating to the protection of the environment
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    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention provides a recycled sand powder green concrete which comprises the following components in percentage by mass: 10% -93% of regenerated sand powder; 5% -83% of a regenerated composite admixture; 0-20% of Portland cement; 0-5% of alkali activator; 1% -2% of an additive; the density of the regenerated sand powder and the regenerated composite admixture prepared by the double blending total amount of more than 70 percent is less than 1900kg/m3Light concrete without coarse aggregate. The invention also provides a preparation method of the recycled sand powder green concrete. The invention relates to a reclaimed sand powder green concrete and a preparation method thereof, wherein a reclaimed composite admixture obtained by mixing and grinding waste concrete cement stone powder and brick-concrete reclaimed sand powder belongs to a multi-component composite cementing material and has composite cementing and stacking effects; the reclaimed sand powder green concrete fully exerts the filling effect and the micro-aggregate effect of reclaimed sand powder and the gelling property of the reclaimed composite admixture, and the double doping exceeds 70 percent, thereby realizing the large doping amount of the reclaimed material, being beneficial to promoting the full utilization of construction waste resources and promoting the green development of the concrete industry.

Description

Reclaimed sand powder green concrete and preparation method thereof
Technical Field
The invention belongs to the technical field of building waste residue recycling, and particularly relates to reclaimed sand powder green concrete and a preparation method thereof.
Background
The concrete is a man-made material with the largest output worldwide, the global total output of the concrete is 60-70 hundred million cubic meters per year, and the national total output of the concrete is 30-40 hundred million cubic meters per year. The recyclable development and sustainable development of concrete are increasingly attracting wide attention. The concrete is basically divided into two major types from the service performance, one type is structural load-bearing concrete, and the other type is non-structural load-bearing concrete, namely functional concrete, such as filling concrete, light aggregate concrete, foam concrete, aerated concrete, powder concrete and the like.
The traditional and narrow-sense recycled concrete refers to concrete prepared by mixing waste concrete recycled aggregate such as concrete structures and the like as admixture; the broadly recycled concrete refers to construction waste, including building waste such as concrete construction waste, brick-concrete construction waste, decoration construction waste and the like, and includes concrete mixed by using one or more of recycled coarse aggregate, recycled fine aggregate, recycled powder and the like as raw materials.
The 'recycled fine aggregate for concrete and mortar' (GB/T25176-2010) and the 'recycled coarse aggregate for concrete' (GB/T25177-2010) issued in China are standards established along with the traditional recycled concrete technical idea. House building waste reclaimed coarse aggregate and reclaimed fine aggregate often fail to meet the requirements of both standards. At present, most concrete enterprises refuse to mix concrete with house building waste recycled coarse aggregate and house building recycled fine aggregate. Practice proves that the technical route for producing the recycled aggregate concrete by improving the strength of the house building waste recycled aggregate is not feasible. The improvement of the strength of the house construction waste regenerated coarse aggregate comprises a physical strengthening technology (namely, a shaping technology, edge angle reduction, leaf shape reduction and the like) and a chemical strengthening technology (namely, a coating technology, organic silicon waterproof agent spraying and dipping regenerated coarse aggregate), which not only increases the cost, but also is difficult to fundamentally improve the strength of the house construction waste regenerated coarse aggregate.
Brick-concrete building wastes are the main factor in the present stage and fifteen years in the future of China. About 150 hundred million tons of building wastes are generated in China before 2030 years, roughly estimated brick-concrete building wastes account for about 70 percent of the total amount of the building wastes, about 20 percent of the brick-concrete building wastes are reinforced concrete building wastes, and about 10 percent of the brick-wood structure building wastes are decoration building wastes and the like.
Brick-concrete recycled coarse aggregate has two weaknesses, which makes it difficult to open up the situation in recycled aggregate concrete: firstly, the crushing value index of the brick-concrete recycled coarse aggregate fluctuates greatly, and secondly, the content of light impurities in the brick-concrete recycled coarse aggregate fluctuates greatly and is difficult to control. This is one of the main reasons why the whole construction waste industry cannot go out of the valley in time.
The porosity of the clay sintered brick is high, so that the water absorption rate and the water content of the brick-concrete building waste are high. Most brick-concrete building wastes have water content of more than 7%. The brick-concrete construction waste is crushed and sieved to recover fine particles with the particle size of less than 5mm, which is substantially regenerated sand powder. The content of the brick-concrete recycled sand powder meets the standard requirement of recycled fine aggregate for concrete and mortar (GB/T25176-2010), and the problem of overproof powder content exists. The brick-concrete regenerated sand powder and sand powder are difficult to separate (the energy consumption for drying the brick-concrete regenerated sand powder is about 20 degrees of electricity, and the energy consumption for selecting the powder is about 10 degrees of electricity), which is the second main reason that the whole construction waste industry cannot leave the valley late.
Concrete is a resource consuming household. 250 hundred million tons of various resources are consumed in China every year, wherein the total consumption of sand, stone and clay in the concrete industry is 150 hundred million tons, and the consumption accounts for about 70 percent of the total resource consumption (including cement consumption) in China. In China, 15 hundred million tons of construction wastes (including concrete construction wastes, brick mixed construction wastes, decoration construction wastes and the like) are discharged in year, wherein 95 percent of the construction wastes are waste clay sintered bricks, waste concrete, waste ceramics, waste glass and other construction wastes, and 5 percent of the construction wastes are light mixed impurities such as waste wood blocks, waste fabrics, waste paper, waste plastics and the like. The development of novel recycled materials is vigorous, functional concrete and products thereof are vigorously developed, the recycling of building waste residues is realized, and the strategic target which needs to be realized in the industry urgently is achieved.
70% of the construction waste in China is cement stone powder and clay sintered brick clinker. Researches find that the mixed grinding of the concrete cement stone powder and the brick-concrete construction waste regenerated sand powder has composite gelling and overlapping effects, and belongs to the field of regenerated cement. China consumes more than 20 hundred million tons of cement every year. The recycling of the construction waste is realized, so that the recycling of the sand and the cement is realized.
Through the search of patent documents, the patent on the recycled cement includes three inventions of patent numbers 200510136624.7 (waste concrete activated recycled cement technology), 200710144945.0 (method for producing recycled aggregate and recycled cement by waste concrete), 201410623582.9 (method for preparing recycled cement by waste concrete). The three patents all belong to the technology of manufacturing recycled cement by calcining waste concrete, and the calcining process is complex and increases the urban environmental load, so that the three patents are difficult to be put into practice in cities. The patent No. 201110373402.2 (recycled cement and its manufacturing method) is a technique for recycling cement by mixing and grinding waste concrete with slag and steel slag, and the total proportion of slag and steel slag accounts for about 50% of the total amount, which increases the workload of waste recycling enterprises.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the recycled sand powder green concrete and the preparation method thereof so as to realize the full utilization of building waste resources and the high value-added utilization as well as the green development and sustainable development of the concrete industry.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the recycled sand powder green concrete is characterized by comprising the following components in percentage by mass:
the density of the regenerated sand powder and the regenerated composite admixture is less than 1900kg/m when the total amount of the regenerated sand powder and the regenerated composite admixture is more than 70 percent3Light concrete without coarse aggregate.
According to the preferred embodiment of the invention, the reclaimed sand powder is a reclaimed sand and reclaimed powder double-component reclaimed material with the particle size of less than 5mm, which is produced by harmless treatment and resource regeneration of construction waste, wherein the reclaimed powder with the particle size of less than 0.075mm accounts for 10-25% of the total reclaimed sand powder; the harmless treatment and resource regeneration are to crush and screen the building waste to primarily separate out metal, combustible and soil, and then obtain the regenerated coarse aggregate with the particle size of 5-50 mm.
According to the preferred embodiment of the invention, the regenerated composite admixture is prepared by mixing the following components in a mass ratio of 6: 4-8: 2, mixing and grinding the concrete regenerated sand powder, the brick-concrete regenerated sand powder and the grinding aid to obtain the regenerated gel material.
According to the preferred embodiment of the invention, the concrete reclaimed sand powder is the concrete reclaimed sand powder which is recycled after concrete construction wastes are crushed and screened to separate sand particles with the particle size of more than 5mm and takes cement stone particles as main components, wherein the sand particles with the particle size of less than 5mm are separated.
According to the preferred embodiment of the invention, the brick-concrete recycled sand powder is the brick-concrete recycled sand powder which is mainly clay sintered brick particles and has the particle size of less than 5mm, and is recovered after the brick-concrete building waste is crushed and screened to separate light-weight impurity particles with the particle size of more than 5 mm.
According to the preferred embodiment of the present invention, the alkali activator comprises sodium silicate and sodium hydroxide.
According to a preferred embodiment of the invention, the admixture comprises a foaming agent and a water reducing agent.
The recycled concrete sand powder used in the invention is particulate matters with the particle size of less than 5mm after the concrete construction wastes are crushed and screened to separate sand and stone particles with the particle size of more than 5mm, and most of the components are cement stones and cement mortar after analysis. The regenerated composite admixture obtained by mixing and grinding the waste concrete regenerated sand powder and the brick-concrete regenerated sand powder belongs to a multi-component composite cementing material and has composite cementing and stacking effects.
The preparation method of the recycled sand powder green concrete is characterized by comprising the following steps:
step (1), first modifying the regenerated material, namely preparing regenerated sand powder:
step (1.1), laminating: crushing the 5-50mm building waste regenerated coarse aggregate by using a lamination crushing device;
step (1.2) removing impurities: separating out particles (sand and stone or light impurities) with the particle size of more than 5mm by adopting a separation device, and recovering regenerated sand powder with the particle size of less than 5 mm;
step (2), secondary modification of the regenerated material-preparation of the regenerated composite admixture:
step (2.1), mixed grinding: according to the mass ratio of 6: 4-8: 2, mixing and grinding the concrete regenerated sand powder and the brick-concrete regenerated sand powder with a grinding aid by using grinding equipment;
step (2.2), selecting powder: recycling 800-mesh regenerated micro powder as regenerated composite admixture and regenerated cementing material through a powder concentrator;
step (3), the third modification of the recycled material, namely the preparation of the recycled sand powder green concrete:
the re-mixed proportion of the reclaimed sand powder and the re-mixed composite admixture is more than 70 percent, and the Portland cement, the alkali activator and the admixture are added according to the mixture ratio to excite the activity of the reclaimed sand powder and the re-mixed composite admixture, so as to produce the reclaimed sand powder green concrete with various strength grades and the density of less than 1900kg/m 3.
According to a preferred embodiment of the invention, the laminating equipment for the first modification of the recycled material in step (1.1) comprises a high-pressure roller press, step (1.2), impurity removal: adopting a sorting device comprising a drum screen; and (2.1) grinding equipment for secondary modification of the recycled material comprises a Raymond mill, a vertical mill, a ring roller mill and a ball mill.
According to the preferred embodiment of the present invention, the alkali activator for three-time modification of the recycled material in step (3) comprises sodium silicate and sodium hydroxide, and the admixture comprises a foaming agent and a water reducing agent.
The first modification principle of the recycled material in the step (1) is that a high-pressure roller press is used for extruding building waste recycled coarse aggregates to form high-pressure material layer group crushing, so that the selective crushing phenomenon is generated, most of silicate waste residues such as fragile material waste concrete, waste bricks, waste ceramics and the like are crushed to the particle size of below 5mm, wherein raw sandstone with higher strength is used as a grinding medium, clinker cement stone and waste bricks are extruded and ground, so that cement stone and waste brick particles are extruded and crushed into powder at first, the recycled powder with the particle size of less than 0.075mm accounts for 10-25%, and the sandstone becomes coarse-fine machine-made sand; and light impurities such as tough material wood chips, broken fabrics and broken plastics are flattened (most of the grain diameters are more than 5 mm), so that the light impurities can be separated by a sand-powder separator or a drum-type sieving machine, and the regenerated sand-powder double-component regenerated material is produced.
The secondary modification principle of the recycled material in the step (2) is that grinding equipment is used for grinding the concrete recycled sand powder and the brick-concrete recycled sand powder in a mixed mode, and the mechanical forces of compression, shearing, impact, friction, stretching, bending and the like cause the concrete recycled sand powder and the brick-concrete recycled sand powder to generate structural and performance changes.
The third modification principle of the regenerated material in the step (3) is that the activity of the powder and the regenerated composite admixture in the regenerated sand powder is excited by cement or alkali activator, and the porosity and the concrete fluidity of the concrete are improved by the combined application of foaming agent, water reducing agent and the like, so as to obtain the regenerated sand powder lightweight concrete, liquid concrete and the like.
Experiments show that the cement excitation type recycled sand powder green concrete has the characteristics of cement saving, high later strength, good durability and the like, and is particularly suitable for producing prefabricated recycled building material products. The alkali-activated recycled sand powder green concrete has the characteristics of cement saving, high early strength, good durability and the like, and is particularly suitable for producing 800kg/m of 300-3The foamed regenerated building material is used in underground pipe gallery concrete and house building wall concrete and is suitable for producing green sand powder base concrete product including road sound barrier board, wall board, road bed cushion, etc.
The first modification is realized by producing the regenerated sand powder through laminating equipment, the mechanical and chemical secondary modification is realized by producing the regenerated composite admixture through grinding equipment, and the regenerated sand powder-based green concrete is produced through the tertiary modification of an excitation technology, so that the large mixing amount of the regenerated material is realized, and the purposes of saving sandstone and cement are achieved; because the concrete does not contain coarse aggregate, the fluidity of the concrete is greatly improved, and the concrete is prevented from being mixed with structural load-bearing concrete; the density of the recycled sand powder green concrete is less than 1900kg/m3Belongs to the category of legal light aggregate concrete, and is suitable for producing various light concrete and products thereof except for structural load-bearing concrete, thereby being expected to be developed into second concrete and becoming important supplement of structural load-bearing concrete.
The application of the regenerated sand-powder concrete comprises regenerated sand-powder-based foamed concrete and regenerated sand-powder-based non-foamed concrete; precast concrete such as regenerated sand powder-based premixed concrete and regenerated sand powder substrate block bricks; the regenerated sand powder base filling concrete for housing engineering, the heat preservation concrete and the like, and the regenerated sand powder base roadbed stabilizing concrete for road engineering, the road slope protection concrete, the municipal underground engineering filling concrete and the like.
Compared with the prior art, the green recycled sand powder concrete and the preparation method thereof have the following beneficial effects:
firstly, waste concrete in China is discharged by about 2 million tons per year, wherein the cement stone is about 5000 million tons, the 5000 million tons of cement stone and brick-mixed reclaimed sand powder are mixed and ground into a reclaimed composite admixture, and the reclaimed composite admixture is partially used for producing non-structural load-bearing functional concrete and products thereof instead of cement, so that the method has great significance for energy conservation and environmental protection.
The concrete regenerated sand powder, the brick-concrete regenerated sand powder and the regenerated composite admixture thereof have filling property and fully exert the characteristics of the pozzolanic cementitious material;
the filling effect and the micro-aggregate effect of the regenerated sand powder and the gelling property of the regenerated composite admixture are fully exerted, the composite admixture is more than 70%, and the large admixture amount of the regenerated material is realized, so that the reduction of the building waste is facilitated;
the alkali-activated cement has the advantages of high strength, good corrosion resistance, good durability and the like, the mixed building waste regenerated sand powder adopts alkali activators such as water glass and the like, can be prepared into regenerated sand powder-based polymer concrete and is used for producing municipal components such as mixed regenerated sand powder concrete road sound insulation boards (sound barrier boards), road partitions, urban sofas and the like, has the characteristics of good sealing property, good durability, light weight, good toughness and the like, and solves the problem of resource recycling of the decorative building waste mixed regeneration material;
and fifthly, comprehensive analysis shows that the recycled sand powder green concrete disclosed by the invention belongs to the category of green building materials:
1. the reclaimed sand powder green concrete belongs to a material-saving green building material, and the composite doping of the reclaimed sand powder and the reclaimed composite admixture exceeds 70 percent, which means that the reclaimed sand powder green concrete saves 70 percent of natural resources and embodies the principle of protecting the limited natural resources;
2. the invention relates to a reclaimed sand powder green concrete, which belongs to an energy-saving green building material; the regenerated sand powder does not need to be dried and selected, and the energy consumption is saved by about 30 degrees per ton; the regenerated composite admixture is a regenerated composite cementing material obtained by mixing and grinding cement stone powder and brick-mixed regenerated sand powder, the cement stone powder contains unhydrated cement particles and clay sintered brick regenerated powder has the characteristic of pozzolanic gelation, and in addition, the cement stone contains fly ash, slag powder, limestone and other substances, and the cement is saved by mechanical chemical activation, alkali excitation and the like of a mixing and grinding machine; the regenerated sand powder green concrete of the invention becomes an important supplement of traditional structural load-bearing concrete, and except that the load-bearing structures such as beam, slab and column of the reinforced concrete structure are not suitable for using the regenerated sand powder green concrete, other lightweight filler wall concrete (including pouring and prefabrication), roof insulation concrete, floor insulation concrete and the like can be used;
3. the reclaimed sand powder green concrete belongs to a healthy green building material; the reclaimed sand powder and the reclaimed composite admixture belong to clean reclaimed materials which are recycled by deep processing; the regeneration coarse aggregate with the thickness of 5-50mm is recycled by adopting a lamination regeneration process device, utilizing the generated selective crushing phenomenon, crushing silicate building slag of brittle materials such as crushed clay bricks, concrete, ceramics, glass and the like, flattening tough materials such as crushed wood blocks, fabrics, plastics and the like, and stripping impurities by a sieving machine, thereby realizing the recovery of clean regeneration materials;
4. the invention relates to a reclaimed sand powder green concrete, which belongs to a high-performance green building material; the recycled sand powder-based green concrete is coarse aggregate-free concrete, can be prepared into high-flow concrete, has good fluidity and is not easy to separate;
5. the reclaimed sand powder green concrete belongs to a green building material with high added value; because the strength of the brick-concrete building waste regenerated coarse aggregate is low and the content fluctuation of impurities is large, the market price is only 8-15 yuan/ton; the regenerated sand powder is obtained by deep processing the brick-concrete building waste regenerated coarse aggregate, so that not only are light impurities stripped, but also the properties of the original regenerated coarse aggregate are changed, the modification and activation are realized, and the production of the regenerated composite admixture is favorable for producing the regenerated sand powder foam concrete and products thereof by utilizing the foaming technology. Through comprehensive evaluation, 1 cubic reclaimed sand powder concrete is expected to be produced by 1 ton of reclaimed sand powder on average, 200 yuan of market value is created by 1 ton of slag building reclaimed material on average, and the value is improved by more than 10 times than the selling price of 8-15 yuan/ton of brick-concrete reclaimed coarse aggregate;
6. the reclaimed sand powder green concrete belongs to safe green building materials; the recycled coarse aggregate concrete, because the cement mortar is wrapped by the aggregate, the variety, the content, the blending rate and the like of the recycled coarse aggregate are difficult to distinguish by naked eyes, and the recycled coarse aggregate concrete is easy to be confused with natural sandstone aggregate concrete, so that some urban engineering construction supervision companies refuse the recycled aggregate concrete to enter a construction site (some urban recycled aggregate concrete is reported when entering the construction site); the recycled sand powder green concrete is non-coarse aggregate concrete, is used as non-structural load-bearing light filling concrete, is easy to distinguish by hand grasping and naked eyes, and is not easy to confuse;
7. the invention relates to a reclaimed sand powder green concrete, which belongs to recyclable building materials; the recycled sand powder-based green concrete can be recycled, recycled and reused after being crushed, so that stacking and landfill are avoided;
8. the recycled sand powder green concrete is 'universal concrete', 'second concrete' and 'second building material', and has wide application; the recycled sand powder green concrete is suitable for producing various concretes besides being used as structural load-bearing concrete: the concrete can be recycled sand powder-based green concrete, and can be used for producing recycled sand powder-based green concrete slab bricks and components for various purposes.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that the following examples are illustrative only and are not intended to limit the scope of the present invention.
Examples 1 to 8:
a preparation method of recycled sand powder green concrete comprises the following steps:
step (1), preparing regenerated sand powder:
usually, a mobile crusher is adopted to pretreat a house demolition site, and the coarsely crushed building waste is transported to a factory for recycling.
The coarsely crushed building waste residues enter a factory, the residue soil with larger soil content and less than 5mm is stripped through a bar screen, and then the method comprises the following steps:
the preparation process of the regenerated sand powder in the step (1) comprises the following steps:
1. laminating: crushing the building waste regenerated coarse aggregate with the particle size of 5-50mm by using laminating equipment of a high-pressure roller press;
2. impurity removal: separating sand and light impurities with a particle size of more than 5mm by using a separation device such as a drum-type sieving machine, and recovering regenerated sand powder with a particle size of less than 5 mm.
Step (2), preparation of the regenerated composite admixture:
1. mixing and grinding: grinding equipment such as a Raymond mill, a vertical mill, a ring roll mill or a ball mill is adopted, and the mass ratio of the grinding equipment to the ring roll mill is 7: 3, adding grinding aids to the concrete regenerated sand powder and the brick-concrete regenerated sand powder for mixed grinding;
2. selecting powder: recycling the regenerated composite admixture with 300-800 meshes through a powder concentrator.
Step (3), preparing the recycled sand powder green concrete:
the regenerated sand powder A, the regenerated composite admixture B, the cement C1, the alkali activator C2, the foaming agent D1 and the water reducing agent D2 can be used for producing products such as regenerated sand powder green concrete with various strength grades and various density grades and slab bricks thereof, and can be used for non-structural load-bearing concrete such as filling walls, heat-insulating walls, terraces, roofs and the like of steel structures or concrete structure fabricated building, and stable concrete, pavements (bricks), enclosing walls and the like of municipal engineering roadbeds.
TABLE 1 proportion (mass%) of non-foamed reclaimed sand-powder concrete and its products
TABLE 2 ratio of components (mass%) of foamed reclaimed sand concrete and its products
Through comparative analysis, the cement-excited recycled sand-powder concrete is suitable for producing and applying to filling concrete for housing engineering and products thereof, the alkali-excited recycled sand-powder concrete is suitable for producing and applying to concrete for road engineering and products thereof, and the cement-alkali activator compound-excited recycled sand-powder concrete is suitable for producing and applying to foaming concrete and products thereof, and has the characteristics of cement saving, proper strength, wide application and the like.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.

Claims (3)

1. A preparation method of recycled sand powder green concrete is characterized in that a novel recycled building material is obtained by modifying recycled materials for three times, and comprises the following steps:
step (1), first modifying the regenerated material, namely preparing regenerated sand powder:
step (1.1), laminating: crushing the 5-50mm building waste regenerated coarse aggregate by using a lamination crushing device;
step (1.2) removing impurities: separating sand and stone or light impurity particles with the particle size of more than 5mm by adopting a separation device, and recovering regenerated sand powder with the particle size of less than 5 mm;
step (2), secondary modification of the regenerated material-preparation of the regenerated composite admixture:
step (2.1), mixed grinding: according to the mass ratio of 6: 4-8: 2, mixing and grinding the concrete regenerated sand powder and the brick-concrete regenerated sand powder with a grinding aid by using grinding equipment;
step (2.2), selecting powder: recycling 800-mesh regenerated micro powder as regenerated composite admixture and regenerated cementing material through a powder concentrator;
step (3), the third modification of the recycled material, namely the preparation of the recycled sand powder green concrete:
the blending proportion of the regenerated sand powder and the regenerated composite admixture is more than 70 percent, and the regenerated sand powder and the regenerated composite admixture are mixed according to the following weight percentage:
adding silicate cement, alkali activator and additive to activate regenerated sand powder and regenerated composite admixture to produce cement with density less than 1900kg/m3The recycled sand powder green concrete with various strength grades.
2. The method for preparing recycled sand green concrete according to claim 1, wherein the laminating equipment for the first modification of the recycled materials in the step (1.1) comprises a high-pressure roller press, and the steps of (1.2) and impurity removal: adopting a sorting device comprising a drum screen; and (2.1) grinding equipment for secondary modification of the recycled material comprises a Raymond mill, a vertical mill, a ring roller mill and a ball mill.
3. The method for preparing recycled sand powder green concrete according to claim 1, wherein the alkali activator for three-time modification of the recycled material in the step (3) comprises sodium silicate and sodium hydroxide, and the additive comprises a foaming agent and a water reducing agent.
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CN110668776B (en) * 2019-11-11 2021-12-31 杜世永 Method for preparing artificial sand, gravel and sand powder from solid waste residues
CN111548068B (en) * 2020-05-18 2021-08-31 福州大学 Single component recycled polymer cement concrete
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