Preparation method of high-strength solid waste recycled material concrete

Abstract

The invention discloses a high-strength solid waste recycled material concrete preparation method, which comprises: S1, selecting concrete waste, red brick waste, pottery tile waste, construction waste, slag, waste tire and waste plastic as solid waste aggregate; s2, selecting the pretreated solid waste aggregate to be matched with the natural gravel aggregate; s3, concrete stirring: putting the mixed concrete raw materials into a stirrer for stirring, firstly adding the weak acid mixed solution, and then adding the alkaline solution; s4, molding and curing; and S5, after concrete curing is completed, mechanical property and durability are detected. According to the method, a large number of solid waste resources are utilized, consumption of natural resources is reduced by recycling and reusing the resources, meanwhile, the problem of environmental pollution is solved, in addition, the pretreated solid waste aggregate is used for replacing natural aggregate, the cost can be effectively reduced, the performance of the concrete can be improved, and the method is suitable for popularization and application. The strength and durability of the concrete are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete processing, and in particular to a method for preparing high-strength solid waste recycling material concrete. Background Art

[0002] High-strength solid waste recycling material concrete refers to using recycled solid waste materials, such as slag, coal ash, etc., as materials to replace part of the cement in traditional concrete to obtain higher strength and durability. This material has the advantages of environmental protection, energy conservation, resource recycling, etc.

[0003] When producing high-strength solid waste recycling material concrete, it is necessary to first perform screening, crushing, drying, etc. on the raw materials, and then mix them with cement, sand, aggregates, etc., and finally make concrete.

[0004] Currently, due to certain differences in the quality of the recycled materials, the strength of the concrete is easily affected and it is difficult to maintain consistency. When preparing the concrete, the degree of reaction of the recycled materials is different, which may cause problems such as cracking and crazing of the concrete; when producing high-strength solid waste recycling material concrete, a large amount of energy and water resources are required, and at the same time, a certain amount of CO2 emissions will also be generated, which has a certain impact on the environment. In view of the above problems, here we propose a method for preparing high-strength solid waste recycling material concrete. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides a method for preparing high-strength solid waste recycling material concrete, which solves the problems that: for high-strength solid waste recycling material concrete, due to certain differences in the quality of the recycled materials, the strength of the concrete is easily affected and it is difficult to maintain consistency. When preparing the concrete, the degree of reaction of the recycled materials is different, which may cause problems such as cracking and crazing of the concrete; when producing high-strength solid waste recycling material concrete, a large amount of energy and water resources are required, and at the same time, a certain amount of CO2 emissions will also be generated, which has a certain impact on the environment.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present invention is realized through the following technical solutions: A method for preparing high-strength solid waste recycling material concrete includes the following manufacturing methods.

[0009] S1, Select concrete waste, red brick waste, ceramic tile waste, construction waste, slag, waste tires, and waste plastics as solid waste aggregates, perform crushing and grinding, control the particle size between 2 - 15 mm, then perform impurity removal to remove impurities, and then wash and dry the materials.

[0010] S2. Select the pretreated solid waste aggregate and natural sand and gravel aggregate for mixing. The solid waste aggregate replaces 30-80% of the natural aggregate. Select portland cement or fly ash cement and add concrete admixtures.

[0011] S3. Mix the concrete. Put the mixed concrete raw materials into a mixer for mixing. First add a weak acid mixed solution, and then add an alkaline solution.

[0012] S4. Molding and curing: Pour the mixed concrete into a mold, use a vibrating rod to compact it, and cure it after the concrete solidifies.

[0013] S5. After the concrete is cured, conduct tests on its mechanical properties and durability.

[0014] As a further preferred embodiment of the present invention, the specific ratio of the solid waste aggregate is as follows: 1-4 parts of concrete waste, 2-5 parts of red brick waste, 1-2 parts of polyethylene glycol, 2.5-5 parts of ceramic tile waste, 0.5-1 part of construction waste, 1-2 parts of slag, 3-6 parts of waste tires, and 0.5-1 part of waste plastic.

[0015] As a further preferred embodiment of the present invention, in step S2, the concrete admixtures include fly ash, silica fume, and iron ore powder, which are mixed in a ratio of 1:1:0.5.

[0016] As a further preferred embodiment of the present invention, in step S3, during the mixing process, the mixing speed is controlled at 650-850 r / min, and the temperature during the mixing process is maintained between 65-90 °C.

[0017] As a further preferred embodiment of the present invention, in step S3, the method of mixing the weak acid is as follows: For atmospheric pressure mixed acid leaching, select HF with a concentration of 1.5 mol / L, HCl with a concentration of 2.0 mol / L, and HNO3 with a concentration of 1.5 mol / L. The mixing temperature is 80 °C, the time is controlled at 30-45 min, the stirring intensity is 300 r / min, and the liquid-solid ratio is 9:1. Then add an alkaline solution. The alkaline solution is a mixture composed of NaCl, GaCl2, Na2CO3, NaOH, and NaHCO3, and the ratio of NaCl, GaCl2, Na2CO3, NaOH, and NaHCO3 is mixed in a ratio of 1:1.6:2:1.5:1.5. The pH of the alkaline solution is controlled between 7.5-8, the liquid-solid ratio is 10:1, the reaction time is 40-65 min, and the reaction temperature is 85 °C.

[0018] As a further preferred embodiment of the present invention, in step S4, prepare the mold: First, prepare a mold that meets the design requirements, and check for damage, looseness, etc. to ensure that the mold can remain stable during concrete pouring. Pour the concrete: Pour the mixed concrete into the mold and vibrate it with a vibrating rod to make the concrete evenly distributed in the mold, expel air and water bubbles, and use a scraper to level and trim the concrete surface. Cure the concrete: After the concrete is poured, it needs to be properly cured, using plastic film covering or moist curing. Demold: After the concrete reaches the design strength, demold and take out the cured concrete member.

[0019] As a further preferred embodiment of the present invention, in step S5, the mechanical tests include compressive strength test, tensile strength test, flexural strength test, and dynamic elastic modulus test; durability tests: including freeze-thaw cycle and carbonation tests, which are used to evaluate the durability of concrete under long-term use and natural environmental conditions.

[0020] (III) Beneficial effects

[0021] The present invention provides a method for preparing high-strength solid waste recycled material concrete. It has the following beneficial effects:

[0022] The method of the present invention utilizes a large amount of solid waste resources. By recycling and reusing these resources, it reduces the consumption of natural resources and at the same time solves the environmental pollution problem. In addition, using pretreated solid waste aggregates instead of natural aggregates can not only effectively reduce costs, but also improve the performance of concrete, enhancing the strength and durability of concrete. Specific embodiments

[0023] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0024] The present invention provides a technical solution: A method for preparing high-strength solid waste recycled material concrete, including the following manufacturing methods,

[0025] S1, Select concrete waste, red brick waste, ceramic tile waste, construction waste, slag, waste tires, and waste plastics as solid waste aggregates, crush and grind them, control the particle size between 2 - 15 mm, then perform impurity removal to remove impurities, and then wash and dry the materials;

[0026] S2. Select the pretreated solid waste aggregate and natural sand and gravel aggregate for mixing. The solid waste aggregate replaces 30 - 80% of the natural aggregate. Select Portland cement or fly ash cement and add concrete admixtures.

[0027] S3. Mix the concrete. Put the mixed concrete raw materials into a mixer for mixing. First add the weak acid mixed solution, and then add the alkaline solution.

[0028] S4. Molding and curing: Pour the mixed concrete into the mold, use a vibrating rod to compact it, and cure it after the concrete solidifies.

[0029] S5. After the concrete curing is completed, conduct tests on mechanical properties and durability.

[0030] The specific ratio of the solid waste aggregate is as follows: 1 - 4 parts of concrete waste, 2 - 5 parts of red brick waste, 1 - 2 parts of polyethylene glycol, 2.5 - 5 parts of ceramic tile waste, 0.5 - 1 part of construction waste, 1 - 2 parts of slag, 3 - 6 parts of waste tires, and 0.5 - 1 part of waste plastic.

[0031] In step S2, the concrete admixtures include fly ash, silica fume, and iron ore powder, which are mixed in a ratio of 1:1:0.5.

[0032] In step S3, during the mixing process, the mixing speed is controlled at 650 - 850 r / min, and the temperature during the mixing process is maintained between 65 - 90 °C.

[0033] In step S3, the method of mixing the weak acid is as follows: For atmospheric pressure mixed acid leaching, select HF with a concentration of 1.5 mol / L, HCl with a concentration of 2.0 mol / L, and HNO3 with a concentration of 1.5 mol / L. The mixing temperature is 80 °C, the time is controlled within 30 - 45 min, the stirring intensity is 300 r / min, and the liquid - solid ratio is 9:1. Then add the alkaline solution. The alkaline solution is a mixture composed of NaCl, GaCl2, Na2CO3, NaOH, and NaHCO3, and the ratio of NaCl, GaCl2, Na2CO3, NaOH, and NaHCO is mixed in a ratio of 1:1.6:2:1.5:1.5. The pH of the alkaline solution is controlled between 7.5 - 8, the liquid - solid ratio is 10:1, the reaction time is 40 - 65 min, and the reaction temperature is 85 °C.

[0034] In step S4, prepare the mold: First, prepare a mold that meets the design requirements and check for damage, looseness, etc. to ensure the mold remains stable during concrete pouring. Pour the concrete: Pour the mixed concrete into the mold and use a vibrating rod to compact it so that the concrete is evenly distributed in the mold, removing air and water bubbles. Use a scraper to level and trim the concrete surface. Cure the concrete: After the concrete is poured, it needs to be properly cured, using plastic film covering or wet curing. Demold: After the concrete reaches the design strength, demold and take out the cured concrete component.

[0035] In step S5, the mechanical tests include compressive strength test, tensile strength test, flexural strength test, and dynamic elastic modulus test; durability tests: including freeze-thaw cycles and carbonation tests, which are used to evaluate the durability of concrete under long-term use and natural environmental conditions.

[0036] Example 1

[0037] A preparation method of high-strength solid waste recycling material concrete includes the following manufacturing methods.

[0038] Select concrete waste, red brick waste, ceramic tile waste, construction waste, slag, waste tires, and waste plastics as solid waste aggregates. The specific ratio of the solid waste aggregates is as follows: 4 parts of concrete waste, 5 parts of red brick waste, 2 parts of polyethylene glycol, 5 parts of ceramic tile waste, 1 part of construction waste, 2 parts of slag, 6 parts of waste tires, and 1 part of waste plastics. Crush and grind them, control the particle size within 15 mm, then remove impurities, and then wash and dry the materials. Select the pretreated solid waste aggregates and natural sand and gravel aggregates for mixing. The solid waste aggregates replace 80% of the natural aggregates. Select Portland cement or fly ash cement and add concrete admixtures. The concrete admixtures include fly ash, silica fume, and iron ore powder, and are mixed in a ratio of 1:1:0.5. Concrete mixing: Put the mixed concrete raw materials into a mixer for mixing. First, add a weak acid mixed solution, and then add an alkaline solution. The mixing speed is controlled at 850 r / min, and the temperature during mixing is maintained between 90 °C. The method of mixing the weak acid is to mix under normal pressure and acid leach with HF at a concentration of 1.5 mol / L, HCl at a concentration of 2.0 mol / L, and HNO3 at a concentration of 1.5 mol / L. The mixing temperature is 80 °C, the time is controlled at 45 min, the mixing intensity is 300 r / min, and the liquid-solid ratio is 9:1. Then add the alkaline solution. The alkaline solution is a mixture composed of NaCl, GaCl2, Na2CO3, NaOH, and NaHCO3, and the mixing ratio of NaCl, GaCl2, Na2CO3, NaOH, and NaHCO is 1:1.6:2:1.5:1.5. The pH of the alkaline solution is controlled between 8, and the liquid-solid ratio is 10:1. The reaction time is 65 min, and the reaction temperature is 85 °C. Molding and curing: Pour the mixed concrete into the mold, use a vibrating rod to vibrate it until it is solidified, and then cure it after the concrete solidifies. Prepare the mold: First, prepare a mold that meets the design requirements and check for damage and looseness to ensure that the mold can remain stable during concrete pouring. Pour the concrete: Pour the mixed concrete into the mold, use a vibrating rod to vibrate it to make the concrete evenly distributed in the mold, remove air and water bubbles, and use a scraper to level and trim the concrete surface. Cure the concrete: After the concrete is poured, it needs to be properly cured, using plastic film covering or wet curing. Demold: After the concrete reaches the design strength, demold and take out the cured concrete components. After the concrete curing is completed, conduct mechanical property and durability tests. The mechanical tests include compressive strength test, tensile strength test, flexural strength test, and dynamic elastic modulus test. Durability test: Include freeze-thaw cycle and carbonation test to evaluate the durability of the concrete under long-term use and natural environmental conditions.

[0039] Example 2

[0040] A preparation method of high-strength solid waste recycling material concrete, including the following manufacturing methods,

[0041] Select concrete waste, red brick waste, ceramic tile waste, construction waste, slag, waste tires, and waste plastics as solid waste aggregates. The specific ratio of the solid waste aggregates is as follows. Among them, there is 1 part of concrete waste, 2 parts of red brick waste, 1 part of polyethylene glycol, 2.5 parts of ceramic tile waste, 0.5 part of construction waste, 1 part of slag, 3 parts of waste tires, and 0.5 part of waste plastics. Crush and grind them, control the particle size within 2mm, then remove impurities, and then wash and dry the materials; Select the pretreated solid waste aggregates and natural sand and gravel aggregates for mixing. The solid waste aggregates replace 30% of the natural aggregates. Select portland cement or fly ash cement, and add concrete admixtures. The concrete admixtures include fly ash, silica fume, and iron ore powder, and are mixed in a ratio of 1:1:0.5; Concrete mixing: Put the mixed concrete raw materials into a mixer for mixing, first add a weak acid mixed solution, and then add an alkaline solution. The mixing speed is controlled at 650r / min, and the temperature during mixing is maintained between 65°C. The method of mixing the weak acid is to mix acid leaching at normal pressure. Select HF with a concentration of 1.5mol / L, HCl with a concentration of 2.0mol / L, and HNO3 with a concentration of 1.5mol / L. The mixing temperature is 80°C, the time is controlled at 30min, the mixing intensity is 300r / min, and the liquid-solid ratio is 9:1. Then add the alkaline solution. The alkaline solution is a mixture composed of NaCl, GaCl2, Na2CO3, NaOH, and NaHCO3, and the mixing ratio of NaCl, GaCl2, Na2CO3, NaOH, and NaHCO is 1:1.6:2:1.5:1.5, and the pH of the alkaline solution is controlled between 7.5, the liquid-solid ratio is 10:1, the reaction time is 40min, and the reaction temperature is 85°C; Molding and curing: Pour the mixed concrete into the mold, use a vibrating rod to vibrate it solid, and cure it after the concrete solidifies. Prepare the mold: First, prepare a mold that meets the design requirements, and check whether there are damages and looseness, etc., to ensure that the mold can remain stable during concrete pouring. Pour the concrete: Pour the mixed concrete into the mold, use a vibrating rod to vibrate it solid, make the concrete evenly distributed in the mold, remove air and water bubbles, and use a scraper to level and trim the concrete surface. Cure the concrete: After the concrete is poured, it needs to be properly cured, using plastic film covering or wet curing. Demold: After the concrete reaches the design strength, demold and take out the cured concrete components; After the concrete curing is completed, conduct mechanical property and durability tests. The mechanical tests include compressive strength test, tensile strength test, flexural strength test, and dynamic elastic modulus test; Durability test: Include freeze-thaw cycle and carbonation test, which are used to evaluate the durability of concrete under long-term use and natural environmental conditions.

[0042] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For a person skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced by the present invention. Any reference signs in the claims should not be construed as limiting the claim concerned.

[0043] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for preparing high-strength concrete made from recycled solid waste, characterized in that: Including the following production methods, S1, select concrete waste, red brick waste, ceramic tile waste, construction waste, slag, discarded tires, and waste plastics as solid waste aggregates, crush and grind them, control the particle size between 2-15mm, then remove impurities, and then wash and dry the materials; S2, select pre-treated solid waste aggregate and natural sand and gravel aggregate to mix, solid waste aggregate replaces 30-80% of natural aggregate, select silicate cement or fly ash cement, and add concrete admixture; S3, concrete mixing, putting the mixed concrete raw materials into a mixer for mixing, and first adding a weak acid mixed solution, and then adding an alkaline solution; S4, molding and curing: pouring the mixed concrete into the mold, compacting it with a vibrating rod, and curing it after the concrete solidifies; S5. After the concrete is cured, the mechanical properties and durability are tested.

2. The method for preparing high-strength solid waste recycled material concrete according to claim 1, characterized in that: The specific proportions of the solid waste aggregates include: 1-4 parts of concrete waste, 2-5 parts of red brick waste, 1-2 parts of polyethylene glycol, 2.5-5 parts of ceramic tile waste, 0.5-1 parts of construction waste, 1-2 parts of slag, 3-6 parts of discarded tires, and 0.5-1 parts of waste plastics.

3. The method for preparing high-strength solid waste recycled material concrete according to claim 1, characterized in that: Step S2, the concrete admixture includes fly ash, silica ash, and iron ore powder, which are mixed in a ratio of 1:1:0.

5.

4. The method for preparing high-strength solid waste recycled material concrete according to claim 1, characterized in that: In step S3, during the stirring process, the stirring speed is controlled at 650-850 r / min, and the temperature is maintained between 65-90° C. during the stirring process.

5. The method for preparing high-strength solid waste recycled material concrete according to claim 1, characterized in that: Step S3, the weak acid mixing method is that the atmospheric pressure mixed acid leaching selects 1.5 mol / L HF, 2.0 mol / L HCl, and 1.5 mol / L HNO3, the mixing temperature is 80°C, the time is controlled at 30-45 min, the stirring intensity is 300 r / min, the liquid-solid ratio is 9:1, and then an alkaline solution is added, the alkaline solution is a mixture of NaCL, GaCL2, Na2CO3, NaOH, and NaHCO3, and the ratio of NaCL, GaCL2, Na2CO3, NaOH, and NaHCO is 1:1.6:2:1.5:1.

5. The pH of the alkaline solution is controlled between 7.5 and 8, the liquid-solid ratio is 10:1, the reaction time is 40-65 min, and the reaction temperature is 85°C.

6. The method for preparing high-strength solid waste recycled material concrete according to claim 1, characterized in that: In step S4, prepare the mold: first prepare a mold that meets the design requirements, and check whether there is any damage or looseness to ensure that the mold can remain stable when pouring concrete. Pour concrete: pour the mixed concrete into the mold, vibrate it with a vibrator to make the concrete evenly distributed in the mold, remove air and bubbles, and use a scraper to level and trim the concrete surface. Curing concrete: after pouring concrete, it needs to be properly cured, using plastic film or wet curing. Demoulding: after the concrete reaches the designed strength, demold it and take out the cured concrete components.

7. The method for preparing high-strength solid waste recycled material concrete according to claim 1, characterized in that: Step S5, mechanical testing includes compression strength test, tensile strength test, bending strength test, dynamic elastic modulus test; durability test: including freeze-thaw cycle and carbonization test, which are used to evaluate the durability of concrete under long-term use and natural environment conditions.