CN112321186A - Method for preparing sandstone by using construction waste - Google Patents
Method for preparing sandstone by using construction waste Download PDFInfo
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- CN112321186A CN112321186A CN202011230861.0A CN202011230861A CN112321186A CN 112321186 A CN112321186 A CN 112321186A CN 202011230861 A CN202011230861 A CN 202011230861A CN 112321186 A CN112321186 A CN 112321186A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/12—Multiple coating or impregnating
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The application relates to the technical field of recycled building materials, and particularly discloses a method for preparing gravel by using building garbage. The method for preparing the sandstone by using the construction waste comprises the following steps: 1) crushing and screening waste concrete to obtain concrete granules; 2) mixing the concrete granules prepared in the step 1) with a surface repairing agent to obtain repairing granules; the surface repairing agent comprises an adhesive resin, wherein the adhesive resin is at least one of phenolic resin and epoxy resin; 3) mixing the repairing aggregate prepared in the step 2) with clay brick powder to obtain composite aggregate; the clay brick powder is obtained by crushing and screening waste clay bricks; 4) heating the composite granules prepared in the step 3) at the temperature of 150-165 ℃ for 6-8h to obtain the composite granules. The method for preparing the sandstone by using the construction waste has the advantages of uniform sandstone particles, high strength and difficulty in cracking.
Description
Technical Field
The application relates to the technical field of recycled building materials, in particular to a method for preparing sandstone by using building waste.
Background
With the rapid development of the construction industry, the amount of building materials such as concrete is more and more used, and the cost of concrete raw materials is low, but in recent years, the prices of various concrete raw materials are rapidly increased along with the continuous consumption of mineral resources, so that the cost of concrete is gradually increased. Due to the use of a large amount of various building materials, the amount of building wastes generated is increased, such as waste concrete, waste bricks and the like. The current treatment modes of the construction waste are generally centralized accumulation or landfill, and the treatment modes are easy to cause the pollution of the construction waste to air or underground water.
The recycled building material is obtained by crushing and grading waste building garbage, and can partially or completely replace natural sandstone aggregates such as sandstone and the like. The regenerated gravel aggregate is easy to generate fine cracks in particles under the action of a large external force in the process of crushing waste concrete, so that the water absorption rate of the regenerated gravel aggregate is very high, and the water absorption rate of the regenerated concrete aggregate is mostly over 12 percent. The high water absorption rate of the recycled sand-stone aggregate is easy to cause the strength reduction of the recycled sand-stone aggregate, and the high water absorption rate of the recycled sand-stone aggregate is also easy to cause the recycled sand-stone aggregate to absorb more water when being used as a concrete aggregate and being mixed with other raw materials, and causes cracks to appear in the particles after release in the later period, thereby causing the strength reduction of the concrete greatly.
The Chinese patent application with the application publication number of CN110590257A discloses a preparation method of recycled concrete, which comprises the following steps: crushing the waste concrete blocks into concrete particles, and screening and grading to obtain recycled aggregate; putting the recycled aggregate into an acidification device, adding an acid water solution to react with the recycled aggregate, wherein the acid can react with calcium hydroxide in the recycled aggregate to generate calcium salt precipitate which is insoluble in water, taking out the recycled aggregate, washing with water, and then air-drying to obtain acid-modified recycled aggregate; adding the acid-modified recycled aggregate into the concrete washing slurry, uniformly stirring, soaking, taking out and drying to obtain the filling-modified recycled aggregate; and putting the filled and modified recycled aggregate into mixed resin for soaking, taking out the mixed resin comprising acrylic resin, epoxy resin and thermosetting phenolic resin, airing and curing to obtain the modified recycled aggregate.
In view of the above-mentioned related technologies, the inventors believe that when the modified recycled aggregate is prepared, the mixed resin is coated on the surface of the recycled aggregate, and the recycled aggregate has a low binding force with other raw materials when in use.
Disclosure of Invention
In order to improve the binding force of sandstone aggregate and other raw materials, the application provides a method for preparing sandstone by using construction waste.
The application provides a method for preparing sandstone by using construction waste, which adopts the following technical scheme:
a method for preparing sandstone by using construction waste comprises the following steps:
1) crushing and screening waste concrete to obtain concrete granules;
2) mixing the concrete granules prepared in the step 1) with a surface repairing agent to obtain repairing granules;
the surface repairing agent is prepared by mixing adhesive resin, a reinforcing agent and a diluent, wherein the adhesive resin is at least one of phenolic resin and epoxy resin; the reinforcing agent is at least one of dibutyl oxalate, diethyl phthalate and diethyl carbonate; the diluent is at least one of cyclohexanone, n-butanol and hexanediol;
3) mixing the repairing granules with clay brick powder to obtain the clay brick; the clay brick powder is obtained by crushing and screening waste clay bricks.
Through adopting above-mentioned technical scheme, the aggregate that obtains after this application carries out crushing and screening with waste concrete mixes with the surface repair agent, bonding resin parcel in the surface repair agent is on concrete granule surface, and then after mixing and passing through heat treatment with useless clay brick powder, resin curing in the surface repair agent, form one deck solidification resin layer on the aggregate surface, the cladding is at the waste clay brick powder on concrete aggregate surface and is formed one deck clay brick bisque, also form a nucleocapsid structure, use waste concrete granule as the core, use the solidification resin layer as the intermediate level, use the clay brick bisque as the skin. The clay brick powder layer can improve the binding force of the recycled concrete particles and other raw materials in construction. The resin curing layer reduces the diffusion of moisture to the interior of the granules, reduces the water absorption of the recycled concrete particles and also reduces the probability of cracks of the recycled concrete particles.
Preferably, the mass ratio of the concrete granules to the surface repairing agent is 100: 12-15.
By adopting the technical scheme, compared with concrete granules, the surface repairing agent has the advantages that the using amount of the surface repairing agent is less, the thickness of a surface repairing agent layer attached to the surface of the concrete granules can be reduced, the influence of resin in the surface repairing agent on the strength of the recycled concrete is reduced, and the cost is also reduced.
Preferably, the surface repairing agent is prepared by mixing adhesive resin, a reinforcing agent and a diluent, wherein the reinforcing agent is at least one of dibutyl glycol, diethyl phthalate and diethyl carbonate; the diluent is at least one of cyclohexanone, n-butanol and hexanediol.
By adopting the technical scheme, the surface repairing agent adopts the combination of the adhesive resin, the reinforcing agent and the diluent, and the reinforcing agent and the diluent can improve the fluidity of the adhesive resin, so that the resin can be more uniformly attached to the surface of concrete particles after being mixed with the concrete particles. The reinforcing agent adopts substances such as dibutyl glycol and the like, so that the viscosity of the resin can be greatly reduced, the probability of resin curing in advance can be reduced, and the surface repairing agent and concrete granules are mixed more uniformly.
Preferably, the mass ratio of the adhesive resin, the reinforcing agent and the diluent is 15-18:3-4.5: 8-10.
Through adopting above-mentioned technical scheme, the volume of adhesive resin is great, and the volume of reinforcing agent is little, has guaranteed that the surface repair agent has higher adhesive strength, uses less surface repair agent can firmly bond outer useless clay brick powder on concrete grain material surface, also further reduces the cost.
Preferably, the reinforcing agent is prepared by mixing any one of diethyl phthalate and diethyl carbonate with dibutyl glycol in a volume ratio of 3-4: 7-9.
By adopting the technical scheme, the reinforcing agent is added with the diethyl phthalate or the diethyl carbonate, so that the fluidity of the bonding resin is improved, the strength of the cured resin can be improved, and the influence of a surface repairing agent layer on the concrete surface on the strength of the granules is reduced.
Preferably, the diluent is formed by mixing at least one of cyclohexanone and hexanediol with n-butanol in a volume ratio of 1: 1-2.
By adopting the technical scheme, the volatilization speed of the diluent can be reduced by adding the cyclohexanone or the hexanediol, the viscosity of the surface repairing agent can be maintained, and the fluidity of the surface repairing agent in the concrete particle mixing process can be improved.
Preferably, the adhesive resin in step 2) includes a resin liquid and a resin powder, and when the concrete granules are mixed with the surface repair agent, the resin liquid is uniformly mixed with the reinforcing agent and the diluent to obtain a premixed surface repair agent, and then the premixed surface repair agent is uniformly mixed with the concrete granules and then is uniformly mixed with the resin powder.
By adopting the technical scheme, the bonding resin adopts the resin liquid and the resin powder, the resin liquid, the reinforcing agent and the diluent form the premixed surface repairing agent, then the premixed surface repairing agent is wrapped on the surface of the concrete particles, the resin powder is adhered to the premixed surface repairing agent layer, the resin powder is uniformly distributed outside the premixed surface repairing agent layer to form a resin powder layer, and the bonding of the waste clay brick powder is firmer during subsequent heating and curing.
Preferably, the mass ratio of the resin liquid to the resin powder is 5-6: 1.
By adopting the technical scheme, the amount of the resin powder is small, so that the resin powder can be more fully bonded on the premixed surface repairing agent layer, and the falling-off of the resin powder is reduced.
Preferably, the temperature of the premixed surface conditioner mixed with the concrete granules in step 2) is 75-80 ℃.
By adopting the technical scheme, the temperature of the premixed surface repairing agent is higher when the premixed surface repairing agent is mixed with concrete particles, so that the viscosity of the adhesive resin can be reduced, and the fluidity of the premixed surface repairing agent is further improved.
Preferably, the step 1) is carried out with a soaking treatment after screening, and the soaking treatment is carried out by soaking for 1-3min by using hydrochloric acid with the mass fraction of 5-8% and then washing with water.
By adopting the technical scheme, the screened concrete particles are added into acid for soaking, the hardened cement on the surfaces of the concrete particles can be dissolved, the surfaces of the concrete particles are in a porous structure, and the surface repairing agent can be more tightly combined to the surfaces of the concrete particles when the concrete particles are mixed with the surface repairing agent.
In summary, the present application has the following beneficial effects:
1. according to the method for preparing the gravel by using the construction waste, the waste concrete aggregate and the resin-containing surface repairing agent are mixed, then the surface repairing agent is attached to the surface of the waste concrete aggregate, then the clay brick powder is attached to the surface of the aggregate, and after heating and curing, the regenerated gravel aggregate with the core-shell structure is obtained.
2. The adhesive resin adopted in the method for preparing the gravel by utilizing the construction waste comprises the resin liquid and the resin powder, and when the concrete aggregate is mixed with the surface repairing agent, the resin powder is adhered to the premixed surface repairing agent layer, so that the resin powder is uniformly distributed outside the surface repairing agent layer to form a resin powder layer, and the bonding strength to the waste clay brick powder is improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The method for preparing the sandstone by using the construction waste comprises the following steps: 1) crushing and screening waste concrete to obtain concrete granules; 2) mixing the concrete granules prepared in the step 1) with a surface repairing agent to obtain repairing granules; the surface repairing agent comprises an adhesive resin, wherein the adhesive resin is at least one of phenolic resin and epoxy resin; 3) mixing the repairing aggregate prepared in the step 2) with clay brick powder to obtain composite aggregate; the clay brick powder is obtained by crushing and screening waste clay bricks; 4) heating the composite granules prepared in the step 3) at the temperature of 150-165 ℃ for 6-8h to obtain the composite granules. The adhesive resin in step 2) is generally a liquid adhesive resin or a combination of a liquid adhesive resin and a solid adhesive resin. If a solid powder binder resin is used, the binder resin may be mixed with n-butanol and then mixed with the concrete granules to adhere them to the surface of the granules. Of course, the solid powder adhesive resin can also be directly mixed with concrete granules to obtain repair granules, then the repair granules are mixed with clay brick powder to obtain composite granules, and the composite granules are heated, cured and crushed to obtain the sandstone.
Further, the particle size of the concrete aggregate in the step 1) is 3-5mm, and the particle size of the clay brick powder is 0-1 mm. The concrete aggregate has larger grain diameter, and the clay brick powder has smaller grain diameter, so that a more continuous clay brick powder coating layer can be formed on the surface of the concrete aggregate, the concrete aggregate is completely coated, and the water absorption of the concrete aggregate is fully reduced.
After screening in the step 1), the granules with the particle size smaller than 1mm are used as sand (fine aggregate), so that the utilization rate of the construction waste is improved.
The sandstone prepared by the method is of a core-shell structure and comprises a concrete granule core, wherein the surface of the concrete granule core is coated with a cured resin layer, and the surface of the cured resin layer is coated with a waste clay brick powder layer.
The concrete granules and the surface repairing agent are uniformly mixed by stirring the concrete granules and the surface repairing agent or the premixed surface repairing agent at the rotating speed of 50-60rpm for 5-8 min.
The repairing aggregate and the powder are uniformly mixed, namely the repairing aggregate and the clay brick powder are stirred for 2-3min at the rotating speed of 30-45 rpm.
The phenolic resin liquid is phenolic resin liquid 2124, and the solid content is 72%.
The epoxy resin is NPES-903 epoxy resin powder produced by south Asia epoxy resin (Kunshan) Limited company, and the solid content is 99.9%.
The mass ratio of the clay brick powder to the repairing aggregate is 2-3: 1.
Adding resin powder, mixing well, and stirring at 55rpm for 2 min.
And (2) shaping after screening in the step 1), wherein the shaping is to add the screened granules into a drum screen for 4-5 hours. The drum sieve comprises a sieve cylinder, the sieve cylinder comprises a cylindrical sieve cylinder base body, sieve holes are formed in the sieve cylinder base body, shaping columns are arranged on the inner wall of the sieve cylinder base body and outside the sieve holes, one end of each shaping column is fixedly connected with the inner wall of the sieve cylinder base body, and the other end of each shaping column extends towards the center of the sieve cylinder base body. The screen drum base body comprises a plurality of first net ribs arranged in parallel and a plurality of second net ribs arranged in parallel, the first net ribs and the second net ribs are connected in an intersecting mode, and the shaping column is arranged at the joint of the first net ribs and the second net ribs. The first net rib is arranged in parallel to the axis of the screen drum base body, and the second net rib is of a circular ring structure.
Examples
Example 1
The method for preparing the sandstone by using the construction waste comprises the following steps:
1) adding the waste concrete blocks into a crusher for crushing, and screening out particles with the particle size of 3-5mm as concrete granules;
adding the waste clay bricks into a crusher for crushing, and screening out particles with the particle size of 0-1mm as clay brick powder;
2) adding phenolic resin liquid, succinic acid ester and n-butanol in a mass ratio of 15:3:10 into a stirrer, and uniformly stirring and mixing to obtain a surface repairing agent;
adding the concrete granules prepared in the step 1) into a stirrer, then adding a surface repairing agent, wherein the mass ratio of the concrete granules to the surface repairing agent is 100:15, and stirring at the rotating speed of 60rpm for 5min to obtain repairing granules;
3) adding clay brick powder into the repair aggregate obtained in the step 2), and stirring at the rotating speed of 30rpm for 3min to prepare composite aggregate;
4) keeping the temperature of the composite granules prepared in the step 3) at 150 ℃ for 8h, and cooling to obtain the composite granules.
Example 2
The method for preparing the sandstone by using the construction waste comprises the following steps:
1) adding the waste concrete blocks into a crusher for crushing, and screening out particles with the particle size of 3-5mm as concrete granules;
adding the waste clay bricks into a crusher for crushing, and screening out particles with the particle size of 0-1mm as clay brick powder;
2) adding phenolic resin liquid, succinic acid ester and n-butanol in a mass ratio of 18:4.5:8 into a stirrer, and uniformly stirring and mixing to obtain a surface repairing agent;
adding the concrete granules prepared in the step 1) into a stirrer, then adding a surface repairing agent, wherein the mass ratio of the concrete granules to the surface repairing agent is 100:12, and stirring at the rotating speed of 50rpm for 8min to obtain repairing granules;
3) adding clay brick powder into the repair aggregate obtained in the step 2), and stirring at the rotating speed of 45rpm for 2min to prepare composite aggregate;
4) keeping the temperature of the composite granules prepared in the step 3) at 165 ℃ for 6h, and cooling to obtain the composite granules.
Example 3
The method for preparing the sandstone by using the construction waste comprises the following steps:
1) adding the waste concrete blocks into a crusher for crushing, and screening out particles with the particle size of 3-5mm as concrete granules;
adding the waste clay bricks into a crusher for crushing, and screening out particles with the particle size of 0-1mm as clay brick powder;
2) adding phenolic resin liquid, succinic acid ester and n-butanol in a mass ratio of 16:3.5:9 into a stirrer, and uniformly stirring and mixing to obtain a surface repairing agent;
adding the concrete granules prepared in the step 1) into a stirrer, then adding a surface repairing agent, wherein the mass ratio of the concrete granules to the surface repairing agent is 100:13, and stirring at the rotating speed of 55rpm for 6min to obtain repairing granules;
3) adding clay brick powder into the repair aggregate obtained in the step 2), and stirring at the rotating speed of 40rpm for 3min to prepare composite aggregate;
4) keeping the temperature of the composite granules prepared in the step 3) at 165 ℃ for 6h, and cooling to obtain the composite granules.
Example 4
The difference between the method for preparing sandstone by using construction waste and the embodiment 3 is that in the step 2), phenolic resin liquid is used as a surface repairing agent, and no reinforcing agent or diluent is added.
Example 5
The method for preparing sandstone by using construction waste of the embodiment is different from the embodiment 3 in that the succinic oxalate in the step 2) is replaced by diethyl phthalate.
Example 6
The method for preparing sandstone from construction waste of the embodiment is different from the embodiment 3 in that n-butanol in the step 2) is replaced by hexanediol.
Example 7
The difference between the method for preparing sandstone by using construction waste and the embodiment 3 is that the succinic oxalate in the step 2) is replaced by a mixed reinforcing agent, and the mixed reinforcing agent is formed by mixing diethyl carbonate and dibutyl oxalate in a volume ratio of 3: 7.
Example 8
The method for preparing sandstone by using construction waste of the embodiment is different from the embodiment 3 in that n-butanol in the step 2) is replaced by a mixed diluent, and the mixed diluent is formed by mixing cyclohexanone and n-butanol in a volume ratio of 1: 1.
Example 9
The difference between the method for preparing sandstone by using construction waste in the embodiment and the embodiment 3 is that the step 2) is as follows:
adding phenolic resin liquid, succinic acid ester and n-butanol in a mass ratio of 12:3.5:9 into a stirrer, and uniformly stirring and mixing to obtain a premixed surface repairing agent;
adding the concrete aggregate prepared in the step 1) into a stirrer, then adding the premixed surface repairing agent, stirring for 6min at the rotating speed of 55rpm, then adding epoxy resin powder, and stirring for 2min at the rotating speed of 55rpm to obtain repaired aggregate; the mass ratio of the phenolic resin liquid to the epoxy resin powder is 5: 1;
the mass ratio of the concrete granules to the surface repairing agent is 100: 13; the mass of the surface repairing agent is the sum of the mass of the premixed surface repairing agent and the mass of the epoxy resin powder.
Example 10
The difference between the method for preparing sandstone by using construction waste in the embodiment and the embodiment 3 is that the step 2) is as follows:
adding the phenolic resin liquid, the reinforcing agent and the diluent in a mass ratio of 12:3.5:9 into a stirrer, and uniformly stirring and mixing to obtain a premixed surface repairing agent; the reinforcing agent is formed by mixing diethyl carbonate and dibutyl glycol in a volume ratio of 4: 9; the diluent is formed by mixing hexanediol and n-butanol according to the volume ratio of 1: 1;
adding the concrete aggregate prepared in the step 1) into a stirrer, then adding the premixed surface repairing agent, stirring for 6min at the rotating speed of 55rpm, then adding epoxy resin powder, and stirring for 2min at the rotating speed of 55rpm to obtain repaired aggregate; the mass ratio of the phenolic resin liquid to the epoxy resin powder is 6: 1;
the mass ratio of the concrete granules to the surface repairing agent is 100: 13; the mass of the surface repairing agent is the sum of the mass of the premixed surface repairing agent and the mass of the epoxy resin powder.
Example 11
The difference between the method for preparing sandstone by using construction waste and the embodiment 10 is that in the step 2), phenolic resin liquid, reinforcing agent and diluent in the mass ratio of 12:3.5:9 are added into a stirrer, and are stirred and mixed uniformly at 80 ℃ to obtain the surface repairing agent.
Example 12
The difference between the method for preparing sandstone by using construction waste and the embodiment 10 is that in the step 2), phenolic resin liquid, reinforcing agent and diluent in the mass ratio of 12:3.5:9 are added into a stirrer, and are stirred and mixed uniformly at 75 ℃ to obtain the surface repairing agent.
Example 13
The difference between the method for preparing sandstone by using construction waste and the embodiment 12 is that in the step 1), the waste concrete blocks are added into a crusher to be crushed, the sieved particles with the particle size of 3-5mm are added into waste hydrochloric acid with the mass fraction of 5% to be soaked for 3min, then solid-liquid separation is carried out, and the solid is added into clear water to be soaked for 2h to prepare concrete granules.
Example 14
The difference between the method for preparing sandstone by using construction waste and the embodiment 12 is that in the step 1), the waste concrete blocks are added into a crusher to be crushed, the sieved particles with the particle size of 3-5mm are added into waste hydrochloric acid with the mass fraction of 8% to be soaked for 1min, then after solid-liquid separation, the solids are added into clear water to be soaked for 3h, and concrete granules are prepared.
Example 15
The difference between the method for preparing sandstone by using construction waste and the embodiment 14 is that in the step 1), the waste concrete blocks are added into a crusher for crushing, particles with the particle size of 3-5mm are sieved out and added into a drum sieve for 4.5 hours, and then the particles are added into waste hydrochloric acid for soaking.
Example 16
The difference between the method for preparing sandstone by using construction waste and the embodiment 14 is that the drum screen comprises a bracket, and a screen cylinder is arranged on the bracket in a rotating fit manner. The screen drum comprises a cylindrical screen drum base body, circular end plates are fixedly arranged at two ends of the screen drum base body respectively, rotating shafts are fixedly arranged at the centers of the circular end plates at two ends of the screen drum base body, the axes of the two rotating shafts coincide, and the axes of the two rotating shafts intersect with the cylindrical axis of the screen drum base body and form an included angle of 30 degrees. The rotating shaft is horizontally arranged and is in rotating fit with the bracket. The sieve cylinder base body comprises a first net rib and a second net rib, and the first net rib is a straight steel bar and is arranged in parallel with the axis of the sieve cylinder base body. The second net rib is a circular steel bar, and the outer diameter of the circular steel bar is equal to that of the circular end plate. The first net ribs are uniformly distributed at intervals along the circumferential direction of the circular end plate, and the second net ribs are uniformly distributed at intervals along the axial direction of the screen drum base body. The first net rib and the second net rib are crossed and fixedly connected together to form the screen. Specifically, the cross fixed connection part of the first net rib and the second net rib is integrally formed. During processing, a steel plate can be punched with square holes to form a sieve, and then the sieve is made into a cylinder to serve as a sieve cylinder base body.
The fixed plastic post that is provided with of first net muscle and second net muscle interconnect department, plastic post are cylindric structure, one end and the junction fixed connection of first net muscle and second net muscle, and the other end extends to sieve section of thick bamboo base member is inside. The shaping column is perpendicular to the inner surface of the first net rib, and the axis of the shaping column is intersected with the axis of the screen drum base body.
Comparative example
Comparative example 1
The method for preparing the sandstone by using the construction waste of the comparative example is different from the method of example 1 in that the step 4) is not included, and the composite granules prepared in the step 3) are naturally aired to be used as the sandstone prepared by using the construction waste of the comparative example.
Comparative example 2
The method for preparing sandstone by using construction waste of the comparative example is different from the method of example 1 in that the method does not comprise the step 4) and the step 3), and the repairing granules prepared in the step 2) are naturally aired to be used as sandstone prepared by using construction waste of the comparative example.
Comparative example 3
The method for preparing sandstone by using construction waste of the comparative example is different from the method of example 1 in that the method does not comprise the step 4) and the step 3), and the repairing aggregate prepared in the step 2) is used as sandstone prepared by using the construction waste of the comparative example after heat preservation at 150 ℃ for 8 hours.
Performance test
(1) The performance of the sand produced by the method for producing sand from construction waste according to examples 1 to 16 and comparative examples 1 to 3 was measured according to JGJ52-2006 Standard test method for quality of sand and stone for general concrete, and the results are shown in the following table.
TABLE 1 comparison of the Sand Properties in examples 1-16 and comparative examples 1-3
(2) Taking the sandstone prepared by the method for preparing sandstone by using construction wastes in examples 1-16 and comparative examples 1-3 as a coarse aggregate, taking cement, fine aggregate, coarse aggregate and a water reducing agent according to the mass ratio of 15:28:43:0.5, adding water according to the water-cement ratio of 0.43 to prepare concrete, and curing. Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate is natural sand with the grain diameter of 0.6-1.18 mm. The water reducing agent is a polycarboxylic acid water reducing agent.
The crack condition of the concrete surface is measured, the compressive strength of the roller compacted concrete is detected according to GB/T50081-2002 standard of mechanical property test method of common concrete, and the test results are shown in the following table.
TABLE 2 comparison of the Properties of the concretes made from the sandstone in examples 1-16 and comparative examples 1-3
According to example 1 and comparative example 1 and tables 1 and 2, the sand produced by the method has high water absorption, high crushing index and low compressive strength without high-temperature curing, and the comprehensive performance of the sand is still to be improved.
According to the example 1 and the comparative example 2 and the combination of the table 1 and the table 2, the water absorption rate of the prepared sand and stone is higher, the crushing index is very high, the compressive strength is low, and the mechanical properties of the sand and the concrete are poorer when clay brick powder is not adhered and the high-temperature curing is not carried out.
According to example 1, comparative example 3 and tables 1 and 2, it can be seen that when clay brick powder is not adhered but is cured at high temperature, the sand produced has low water absorption, but still relatively poor mechanical properties.
In summary, the sandstone prepared by the method for preparing the sandstone by using the construction waste has low water absorption, far lower impurity content than natural aggregate, lower crushing index, excellent mechanical property and very good comprehensive performance. In the concrete, the binding force with other raw materials is strong, and the prepared concrete is not easy to crack.
Claims (10)
1. A method for preparing sandstone by using construction waste is characterized by comprising the following steps: the method comprises the following steps:
1) crushing and screening waste concrete to obtain concrete granules;
2) mixing the concrete granules prepared in the step 1) with a surface repairing agent to obtain repairing granules;
the surface repairing agent comprises an adhesive resin, wherein the adhesive resin is at least one of phenolic resin and epoxy resin;
3) mixing the repairing aggregate prepared in the step 2) with clay brick powder to obtain composite aggregate; the clay brick powder is obtained by crushing and screening waste clay bricks;
4) heating the composite granules prepared in the step 3) at the temperature of 150-165 ℃ for 6-8h to obtain the composite granules.
2. The method for preparing sandstone by using construction waste according to claim 1, wherein the method comprises the following steps: the mass ratio of the concrete granules to the surface repairing agent is 100: 12-15.
3. The method for preparing sandstone according to claim 2, wherein the method comprises the following steps: the surface repairing agent is prepared by mixing adhesive resin, a reinforcing agent and a diluent, wherein the reinforcing agent is at least one of dibutyl glycol, diethyl phthalate and diethyl carbonate; the diluent is at least one of cyclohexanone, n-butanol and hexanediol.
4. The method for preparing sandstone according to claim 3, wherein the method comprises the following steps: the mass ratio of the adhesive resin, the reinforcing agent and the diluent is 15-18:3-4.5: 8-10.
5. The method for preparing sandstone according to claim 4, wherein the method comprises the following steps: the reinforcing agent is formed by mixing any one of diethyl phthalate and diethyl carbonate with dibutyl oxalate in a volume ratio of 3-4: 7-9.
6. The method for preparing sandstone according to claim 4, wherein the method comprises the following steps: the diluent is formed by mixing at least one of cyclohexanone and hexanediol with n-butanol in a volume ratio of 1: 1-2.
7. The method for preparing sandstone using construction waste according to any one of claims 1 to 6, wherein the method comprises the following steps: the adhesive resin in the step 2) comprises resin liquid and resin powder, when the concrete granules are mixed with the surface repairing agent, the resin liquid, the reinforcing agent and the diluent are uniformly mixed to obtain the premixed surface repairing agent, then the premixed surface repairing agent is uniformly mixed with the concrete granules, and then the premixed surface repairing agent is uniformly mixed with the resin powder.
8. The method for preparing sandstone according to claim 7, wherein the method comprises the following steps: the mass ratio of the resin liquid to the resin powder is 5-6: 1.
9. The method for preparing sandstone according to claim 7, wherein the method comprises the following steps: the temperature of the premixed surface repairing agent mixed with the concrete particles in the step 2) is 75-80 ℃.
10. The method for preparing sandstone by using construction waste according to claim 1, wherein the method comprises the following steps: and (2) carrying out soaking treatment after screening in the step 1), wherein the soaking treatment is to soak in 5-8% by mass of hydrochloric acid for 1-3min and then wash with water.
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| CN114380560A (en) * | 2022-02-08 | 2022-04-22 | 华创建筑设计有限公司 | C50 high-strength resin concrete and preparation process thereof |
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