CN111635190A - Recycled aggregate concrete and preparation method thereof - Google Patents
Recycled aggregate concrete and preparation method thereof Download PDFInfo
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- CN111635190A CN111635190A CN202010430593.0A CN202010430593A CN111635190A CN 111635190 A CN111635190 A CN 111635190A CN 202010430593 A CN202010430593 A CN 202010430593A CN 111635190 A CN111635190 A CN 111635190A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions 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
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
- C03C1/002—Use of waste materials, e.g. slags
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C12/00—Powdered glass; Bead compositions
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/10—Clay
- C04B14/106—Kaolin
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/22—Glass ; Devitrified glass
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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
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- C04B20/02—Treatment
- C04B20/04—Heat treatment
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a recycled aggregate concrete and a preparation method thereof, wherein the concrete consists of cement, fly ash, mineral powder, recycled aggregate, recycled glass blocks, recycled glass powder, kaolin, polyvinyl butyral resin, a water reducing agent and water, wherein the recycled glass blocks are subjected to stabilizing treatment, and in the processing process, the surface of the recycled glass blocks is firstly coated with a layer of polyvinyl butyral resin to prevent the recycled glass blocks from self-explosion, and the connection between the recycled glass blocks and other substances in the concrete can be improved.
Description
Technical Field
The invention relates to the field of concrete, in particular to recycled aggregate concrete and a preparation method thereof.
Background
The recycled aggregate concrete is novel concrete, and is prepared by taking aggregate prepared from waste concrete as the aggregate in the novel concrete. Due to the development of the urbanization process in China, the discharge amount of the construction waste is increased year by year, however, most of the construction waste is not treated at all and is transported to the suburbs or the periphery of the city for simple landfill or open-air stockpiling, which wastes land and resources and pollutes the environment, and on the other hand, the demand of the construction industry for the gravel aggregate is continuously increased along with the increasing of the population. Therefore, the recycled concrete can be used as a substitute of the gravel aggregate, the use of the gravel aggregate is reduced, and the building solid waste can be recycled, so that the recycled concrete is green and environment-friendly.
Currently, the recycled aggregate is generally prepared by placing waste concrete fragments into a crusher for crushing treatment, performing six-level screening to screen out concrete fragments with proper size, then placing the concrete fragments into a hydrochloric acid solution with the mass concentration of 6-8% for soaking for 20-24 hours, and washing for 2-4 times with water.
However, since this aggregate is crushed during the processing, its surface is rough and angular, and a large number of micro-cracks are formed inside the aggregate due to the accumulation of damage, which results in a recycled aggregate having a large porosity, a small bulk density, and a high crushing index. The strength of the concrete prepared by the recycled aggregate concrete is low, so that the recycled aggregate concrete with high strength is urgently needed at present.
Disclosure of Invention
In view of the defects of the prior art, the first object of the invention is to provide recycled aggregate concrete which has the advantage of higher strength.
The second purpose of the invention is to provide a preparation method of recycled aggregate concrete, which is used for preparing the recycled aggregate concrete.
In order to achieve the first object, the invention provides the following technical scheme: the recycled aggregate concrete comprises the following components in parts by weight:
250-300 parts of cement;
50-60 parts of fly ash;
100-110 parts of mineral powder;
300-350 parts of recycled aggregate;
200 portions and 250 portions of regenerated glass blocks;
30-50 parts of regenerated glass powder;
100-110 parts of kaolin;
10-15 parts of polyvinyl butyral resin;
10-12 parts of a water reducing agent;
180-190 parts of water;
the recycled aggregate is waste concrete fragments, and the diameter range of the recycled aggregate is 5-8 cm;
the regenerated glass block is a waste toughened glass block, the diameter range of the regenerated glass block is 10-20mm, and the regenerated glass block is prepared by the following method:
s1: crushing the waste toughened glass, screening waste toughened glass blocks with the diameter range of 10-20mm, and washing and drying the screened waste toughened glass blocks;
s2: heating the waste toughened glass block to 220 ℃ at 200-.
The regenerated glass powder is waste toughened glass powder, the diameter range of the regenerated glass powder is 0.1-0.5mm, and the regenerated glass powder is prepared by the following method:
s1: crushing the waste toughened glass, screening waste toughened glass powder with the diameter range of 0.1-0.5mm, washing and drying the screened waste toughened glass powder;
s2: mixing the powdery silicon dioxide and the waste toughened glass powder in a proportion of 1: and (2-3), immersing the mixture in a saturated solution of sodium dodecyl sulfate after uniform mixing, drying and drying after ultrasonic treatment for 20-30min, wherein the drying temperature is lower than 120 ℃.
By adopting the technical scheme, the strength of the concrete is improved by adding the regenerated glass blocks. However, since the recycled glass block is a tempered glass block, although the grain size of the tempered glass block is small, the recycled glass block still has the possibility of spontaneous explosion, and when the recycled glass block is mixed with concrete, the mixing is not uniform enough, so that the recycled glass block is firstly subjected to stabilizing treatment, namely heating, cooling, reheating and cooling again, so as to be subjected to stabilizing treatment, the self-explosion of the tempered glass block is effectively prevented, and the explosion caused by violent impact can be effectively prevented. And secondly, the polyvinyl butyral resin can wrap the outside of the recycled glass to prevent the recycled glass from self-explosion, and can strengthen the connection between the recycled glass and the concrete, so that the recycled glass blocks are better and uniformly mixed in the concrete, and the strength of the concrete is increased. In addition, the added regenerated glass blocks can also improve the heat insulation performance of the concrete and increase the heat insulation effect of the concrete.
The regenerated glass powder and the silicon dioxide powder are mixed and then soaked in a lauryl sodium sulfate saturated solution, so that alkyl branched chains can be distributed on the surface of the glass powder, the connection between the glass powder and concrete is increased, and the strength of the glass powder can be integrally enhanced after the pure silicon dioxide powder is mixed with the glass powder. The mineral powder can cooperate with the glass powder to improve the strength of the concrete and reduce the slump of the concrete. The addition of the kaolin can fill gaps on the surface of the recycled aggregate, can improve the strength of the whole concrete and can improve the flexural strength of the concrete.
The water reducing agent can reduce the dosage of water when cement is mixed with water, effectively reduce the slump of concrete and improve the early strength of the concrete. In addition, the relative concentration of the polyvinyl butyral resin can reach a large value due to the small amount of water added, ensuring that all the surfaces of the recycled glass blocks can be coated, and strengthening the connection between the recycled glass blocks and the concrete.
Further, the recycled aggregate concrete comprises the following components in parts by weight:
285 parts of cement;
58 parts of fly ash;
105 parts of mineral powder;
320 parts of recycled aggregate;
210 parts of recycled glass blocks;
50 parts of regenerated glass powder;
105 parts of kaolin;
12 parts of a polyvinyl butyral resin;
11 parts of a water reducing agent;
185 parts of water.
By adopting the technical scheme, when the recycled aggregate concrete prepared by the weight parts is adopted, the recycled aggregate concrete has better mechanical property and better heat preservation effect.
Further, the recycled glass block is prepared by the following method:
s1: crushing the waste toughened glass, screening waste toughened glass blocks with the diameter range of 10-20mm, and washing and drying the screened waste toughened glass blocks;
s2: and heating the waste toughened glass block to 210 ℃, keeping the temperature for 2h, then immediately cooling for 12min, continuing to heat to 195 ℃, and then cooling to room temperature to obtain the regenerated glass block.
By adopting the technical scheme, when the waste toughened glass is treated by adopting the mode, the self-explosion rate of the obtained regenerated glass is basically 0, and the obtained regenerated glass is easily wrapped by the polyvinyl butyral resin.
Further, the regenerated glass powder is prepared by the following method:
s1: crushing the waste toughened glass, screening waste toughened glass powder with the diameter range of 0.1-0.5mm, washing and drying the screened waste toughened glass powder;
s2: mixing the powdery silicon dioxide and the waste toughened glass powder in a proportion of 1: 2.5, immersing the mixture in a saturated solution of sodium dodecyl sulfate after uniform mixing, drying and drying after ultrasonic treatment for 25min, wherein the drying temperature is 110 ℃.
By adopting the technical scheme, the obtained regenerated glass powder is easy to disperse in concrete, and the strength of the concrete can be enhanced.
Furthermore, the sodium dodecyl sulfate is prepared from sodium dodecyl sulfate produced by Hubei Xin Rundchemical company Limited.
Further, the powdery silicon dioxide is superfine silicon dioxide produced by Gallery Chenkun chemical building materials GmbH.
Further, the kaolin is modified kaolin, which is prepared by the following method:
s1: calcining the kaolin for 2 hours at the calcining temperature of 450-500 ℃, and cooling to room temperature after calcining;
s2: mixing the calcined kaolin and the nano zinc oxide powder, wherein the weight ratio of the calcined kaolin to the nano zinc oxide powder is (30-35): 1, uniformly mixing, pouring into deionized water, boiling and keeping for 1-2h, cooling to room temperature, and centrifugally separating and drying to obtain the modified kaolin.
By adopting the technical scheme, after the kaolin is calcined, the pores are enlarged, and then the kaolin is mixed with the nano zinc oxide, so that the kaolin and the nano zinc oxide can be well and uniformly mixed, bubbles in the pores of the kaolin can be discharged as far as possible while the kaolin and the nano zinc oxide are boiled, the nano zinc oxide and the kaolin are well combined, and the dispersibility of the kaolin in concrete is enhanced. And the added nano zinc oxide can enhance the corrosion resistance of the concrete.
Further, the modified kaolin is prepared by the following method:
s1: calcining kaolin for 2 hours at 480 ℃, and cooling to room temperature after calcining;
s2: mixing the calcined kaolin and the nano zinc oxide powder, wherein the weight ratio of the calcined kaolin to the nano zinc oxide powder is 32: 1, uniformly mixing, pouring into deionized water, boiling and keeping for 1.5h, cooling to room temperature, and centrifugally separating and drying to obtain the modified kaolin.
By adopting the technical scheme, the obtained modified kaolin is easier to disperse in concrete.
Further, the kaolin is kaolin produced by Lingshou Xinfu mineral processing factory.
Further, the nano zinc oxide is selected from nano zinc oxide powder produced by chemical raw materials limited of Junpeng of Foshan city.
Further, the water reducing agent is a polycarboxylic acid water reducing agent.
By adopting the technical scheme, the addition of the polycarboxylic acid water reducing agent can reduce the using amount of water so as to improve the early strength of concrete and reduce the slump of the concrete.
Further, the water reducing agent is selected from Dong guan Luomai LM-S2.
Further, the cement is ordinary portland cement.
By adopting the technical scheme, the portland cement has the characteristics of high strength, large hydration heat, good freezing resistance, small drying shrinkage, good wear resistance and good carbonization resistance, can be well connected with the regenerated glass block, has low cost and is suitable for mass production.
Further, the cement is sea snail cement (ordinary portland cement).
Further, the polyvinyl butyral resin is selected from polyvinyl butyral resins produced by Liaoning Yingkou Tianyuan high molecular resins GmbH.
Further, the fly ash is produced by Shijiazhuanbenuo mineral products, Inc.
Further, the mineral powder is produced by Jiangxi Liqing calcium industry Co.
Further, the weight ratio range of the kaolin to the regenerated glass powder is (2-3): 1.
by adopting the technical scheme, when the weight ratio range of the kaolin to the regenerated glass powder is (2-3): 1, the obtained concrete has high strength and good anti-bending effect.
Further, the weight ratio of the kaolin to the regenerated glass powder is 2.01: 1.
by adopting the technical scheme, when the weight ratio of the kaolin to the regenerated glass powder is 2.01: 1, the prepared concrete has high strength and good anti-bending effect.
Further, the weight ratio range of the regenerated glass block to the regenerated glass powder is (4-6): 1.
by adopting the technical scheme, when the weight ratio range of the regenerated glass block to the regenerated glass powder is (4-6): 1, the prepared concrete has higher strength.
Further, the weight ratio of the regenerated glass block to the regenerated glass powder is 4.02: 1.
by adopting the technical scheme, when the weight ratio of the regenerated glass block to the regenerated glass powder is 4.02: 1, the prepared concrete has higher strength.
Further, the recycled aggregate is produced by Guangzhou Xinli construction engineering Co.
In order to achieve the second object, the invention provides the following technical scheme: a preparation method of recycled aggregate concrete comprises the following steps:
the method comprises the following steps: mixing the regenerated glass block with polyvinyl butyral resin, heating while stirring to make the temperature reach 60-65 ℃, stirring for 10-20min to make the surface of the regenerated glass block coated with polyvinyl butyral resin;
step two: uniformly mixing cement, fly ash, mineral powder, recycled aggregate, recycled glass powder, kaolin and a water reducing agent, adding water into the mixture, and stirring for 2-3 min;
step three: and (3) within 2min, pouring the substance prepared in the step one into the mixed substance prepared in the step two, stirring while adding, and then continuously stirring for 5-7min to uniformly mix the substances to obtain the recycled aggregate concrete.
By adopting the technical scheme, when the recycled aggregate concrete is produced, the recycled glass block and the polyvinyl butyral resin are mixed and heated, so that the surfaces of the recycled glass block are coated with the polyvinyl butyral resin. And the temperature is kept between 60 and 65 ℃, so that the polyvinyl butyral resin has better fluidity. Then the rest materials of the concrete are mixed firstly, and then poured into the regenerated glass block coated with the polyvinyl butyral resin, so that the uniform mixing of the regenerated glass block and the rest materials of the concrete can be ensured, and the hydrothermal reaction of the cement can be promoted due to the certain temperature of the regenerated glass block. When the time for adding the recycled glass block exceeds two minutes, the temperature of the remaining recycled glass block is lowered, so that the mixing is easily uneven, and the strength of the concrete is reduced.
Further, in the first step, the temperature of the mixture is 60 ℃, and the stirring time is 15 min.
By adopting the technical scheme, the polyvinyl butyral resin has better fluidity when being heated to 60 ℃.
Further, in the second step, the stirring time is 2.5 min.
By adopting the technical scheme, in the step two, when the stirring time is 2.5min, the mixture is preliminarily and uniformly mixed, and at the moment, the regenerated glass is poured into the mixture, so that the overall mixing time can be reduced, and the mechanical property of the concrete can not be influenced due to overlong stirring time of the concrete.
In conclusion, the invention has the following beneficial effects:
firstly, because the invention adopts the recycled glass block as the reinforcing material, the strength of the concrete is effectively improved, and before the recycled glass block is used, the glass block is subjected to stabilizing treatment, the self-explosion phenomenon of the toughened glass block is prevented, and the added polyvinyl butyral resin can effectively improve the connection between the toughened glass block and other substances in the concrete, and improve the compressive strength and the flexural strength of the concrete.
Secondly, because the recycled glass blocks are added, the heat preservation effect of the concrete is improved, and the application of the concrete is wider.
Detailed Description
The present invention will be described in further detail with reference to examples.
The raw materials used in the following preparation examples, examples and comparative examples were commercially available, and the sources of raw materials were as shown in table 1.
TABLE 1
Preparation example 1
A recycled glass block made by the method comprising:
s1: crushing the waste toughened glass, screening waste toughened glass blocks with the diameter range of 10-20mm, and washing and drying the screened waste toughened glass blocks;
s2: and heating the waste toughened glass blocks to 200 ℃, keeping the temperature for 2.5h, then immediately cooling for 15min, continuing to heat to 190 ℃, and then cooling to room temperature to obtain the regenerated glass blocks.
Preparation example 2
A recycled glass block made by the method comprising:
s1: crushing the waste toughened glass, screening waste toughened glass blocks with the diameter range of 10-20mm, and washing and drying the screened waste toughened glass blocks;
s2: and heating the waste toughened glass blocks to 220 ℃, keeping the temperature for 2.2h, then immediately cooling for 10min, continuing to heat to 190 ℃, and then cooling to room temperature to obtain the regenerated glass blocks.
Preparation example 3
A recycled glass block made by the method comprising:
s1: crushing the waste toughened glass, screening waste toughened glass blocks with the diameter range of 10-20mm, and washing and drying the screened waste toughened glass blocks;
s2: and heating the waste toughened glass blocks to 210 ℃, keeping the temperature for 2 hours, immediately cooling for 12min, continuously heating to 195 ℃, and cooling to room temperature to obtain the regenerated glass blocks.
Preparation example 4
A regenerated glass powder is prepared by the following method:
s1: crushing the waste toughened glass, screening waste toughened glass powder with the diameter range of 0.1-0.5mm, washing and drying the screened waste toughened glass powder;
s2: mixing the powdery silicon dioxide and the waste toughened glass powder in a proportion of 1: 2, immersing the mixture in a saturated solution of sodium dodecyl sulfate after uniformly mixing, drying and drying after ultrasonic treatment for 30min, wherein the drying temperature is 115 ℃, and thus obtaining the regenerated glass powder.
Preparation example 5
A regenerated glass powder is prepared by the following method:
s1: crushing the waste toughened glass, screening waste toughened glass powder with the diameter range of 0.1-0.5mm, washing and drying the screened waste toughened glass powder;
s2: mixing the powdery silicon dioxide and the waste toughened glass powder in a proportion of 1: 3, immersing the mixture in a saturated solution of sodium dodecyl sulfate after uniformly mixing, drying and drying after ultrasonic treatment for 20min, wherein the drying temperature is 120 ℃, and thus obtaining the regenerated glass powder.
Preparation example 6
A regenerated glass powder is prepared by the following method:
s1: crushing the waste toughened glass, screening waste toughened glass powder with the diameter range of 0.1-0.5mm, washing and drying the screened waste toughened glass powder;
s2: mixing powdery silicon dioxide and waste toughened glass powder in a proportion of 1: 2.5, immersing the mixture in a saturated solution of sodium dodecyl sulfate after uniform mixing, drying and drying after ultrasonic treatment for 25min, wherein the drying temperature is 110 ℃, and obtaining the regenerated glass powder.
Preparation example 7
A modified kaolin is prepared by the following method:
s1: calcining kaolin for 2 hours at the calcining temperature of 500 ℃, and cooling to room temperature after calcining;
s2: mixing the calcined kaolin and the nano zinc oxide powder, wherein the weight ratio of the calcined kaolin to the nano zinc oxide powder is 30: 1, uniformly mixing, pouring into deionized water, boiling and keeping for 1h, cooling to room temperature, and centrifugally separating and drying to obtain the modified kaolin.
Preparation example 8
A modified kaolin is prepared by the following method:
s1: calcining kaolin for 2 hours at the temperature of 450 ℃, and cooling to room temperature after calcining;
s2: mixing the calcined kaolin and the nano zinc oxide powder, wherein the weight ratio of the calcined kaolin to the nano zinc oxide powder is 35: 1, uniformly mixing, pouring into deionized water, boiling and keeping for 2 hours, cooling to room temperature, and centrifugally separating and drying to obtain the modified kaolin.
Preparation example 9
A modified kaolin is prepared by the following method:
s1: calcining kaolin for 2 hours at 480 ℃, and cooling to room temperature after calcining;
s2: mixing the calcined kaolin and the nano zinc oxide powder, wherein the weight ratio of the calcined kaolin to the nano zinc oxide powder is 32: 1, uniformly mixing, pouring into deionized water, boiling and keeping for 1.5h, cooling to room temperature, and centrifugally separating and drying to obtain the modified kaolin.
Example 1
The recycled aggregate concrete comprises the following components in parts by weight as shown in Table 2, and is prepared by the following steps:
the method comprises the following steps: mixing the regenerated glass block with polyvinyl butyral resin, heating while stirring to make the temperature reach 60 ℃, stirring for 10min to make the surface of the regenerated glass block coated with polyvinyl butyral resin;
step two: uniformly mixing cement, fly ash, mineral powder, recycled aggregate, recycled glass powder, kaolin and a water reducing agent, adding water into the mixture, and stirring for 2.5 min;
step three: and (3) within 2min, pouring the substance prepared in the step one into the mixed substance prepared in the step two, stirring while adding, and then continuously stirring for 6min to uniformly mix the substances to obtain the recycled aggregate concrete.
Examples 2 to 11: a recycled aggregate concrete is different from the concrete of example 1 in that the components and the corresponding parts by weight are shown in Table 2.
Example 12: a recycled aggregate concrete is different from the concrete in example 11 in that the heating temperature is 65 ℃ and the stirring is carried out for 15min in the first step, the stirring time is 2min in the second step and the stirring time is 5min in the third step.
Example 13: a recycled aggregate concrete is different from the concrete in example 11 in that the heating temperature is 63 ℃ and the stirring is carried out for 20min in the first step, the stirring time is 3min in the second step and the stirring time is 7min in the third step.
Comparative example 1
A concrete prepared by the steps of:
uniformly mixing 285 parts of cement, 58 parts of fly ash, 105 parts of mineral powder, 320 parts of recycled aggregate and 11 parts of water reducing agent, adding 195 parts of water into the mixture, and stirring for 8.5min to uniformly mix the mixture to obtain the concrete.
Comparative example 2
A concrete prepared by the steps of:
285 parts of cement, 58 parts of fly ash, 105 parts of mineral powder, 320 parts of recycled aggregate, 210 parts of recycled glass blocks (waste toughened glass blocks which are not pretreated), 50 parts of recycled glass powder prepared in preparation example 6, 105 parts of kaolin prepared in preparation example 9 and 11 parts of water reducing agent are uniformly mixed, 195 parts of water is added into the mixture, and the mixture is stirred for 8.5min and uniformly mixed to obtain the concrete.
Comparative example 3
The concrete comprises the following components in parts by weight as shown in Table 2, and is prepared by the following steps:
the method comprises the following steps: mixing the regenerated glass block with polyvinyl butyral resin, heating while stirring to make the temperature reach 60 ℃, stirring for 10min to make the surface of the regenerated glass block coated with polyvinyl butyral resin;
step two: uniformly mixing cement, fly ash, mineral powder, recycled aggregate and a water reducing agent, adding water into the mixture, and stirring for 2.5 min;
step three: and (3) within 2min, pouring the substance prepared in the first step into the mixed substance prepared in the second step, stirring while adding, and then continuously stirring for 6min to uniformly mix the substances to obtain the concrete.
Comparative example 4
The concrete comprises the following components in parts by weight as shown in Table 2, and is prepared by the following steps:
uniformly mixing cement, fly ash, mineral powder, recycled aggregate, recycled glass powder, recycled glass blocks and a water reducing agent, then adding water into the mixture, and stirring for 8.5min to uniformly mix the mixture to obtain the concrete.
Comparative example 5
A recycled aggregate concrete, which comprises the same components and parts by weight as those in example 11, is prepared by the following steps:
the method comprises the following steps: heating polyvinyl butyral resin to 60 deg.c and stirring for 10 min;
step two: uniformly mixing cement, fly ash, mineral powder, recycled aggregate, recycled glass powder, recycled glass blocks, kaolin and a water reducing agent, adding water into the mixture, and stirring for 2.5 min;
step three: and (3) within 2min, pouring the substance prepared in the step one into the mixed substance prepared in the step two, stirring while adding, and then continuously stirring for 6min to uniformly mix the substances to obtain the recycled aggregate concrete.
TABLE 2
Performance test
Detection method/test method
1. And (3) testing the compressive strength and the flexural strength: the concrete prepared in examples 1-13 and comparative examples 1-5 was tested according to the method described in GB/T-50081-2002 Standard for testing mechanical Properties of general concrete, and the test data are shown in Table 3.
2. And (3) testing the heat conductivity coefficient: according to the regulations in JG/T266-2011, the concrete prepared in the examples 1-13 and the concrete prepared in the comparative examples 1-5 are tested, the smaller the thermal conductivity coefficient is, the better the heat preservation effect is, and the test data are shown in Table 3.
3. And (3) self-explosion rate test: preparing the concrete prepared in the examples 1-13 and the comparative examples 1-5 into a flat plate, wherein the size of the flat plate is 1m multiplied by 60cm multiplied by 3cm, heating one side of the flat plate by an infrared lamp to enable the surface temperature to be higher than 50 ℃, blowing cold air to the other opposite side of the flat plate, keeping the surface temperature to be lower than 20 ℃, keeping the temperature for 24 hours, detecting whether the flat plate has cracks or not, testing 20 flat plates in each group, and calculating the spontaneous explosion rate;
the spontaneous explosion rate is divided by the number of plates with cracks divided by the number of total plates multiplied by 100%.
The test data are shown in Table 3.
TABLE 3
As can be seen from Table 3, the flexural strength, compressive strength and thermal insulation properties of the concrete prepared in example 11 are all better in examples 1-13, which illustrates the better properties of the concrete prepared according to the protocol of example 11.
Examples 1 to 4 compared with examples 8 to 11, when the recycled glass block was the recycled glass block prepared in preparation example 3, the recycled glass powder was the recycled glass powder prepared in preparation example 6, and the kaolin was the modified kaolin prepared in preparation example 9, the concrete prepared in this case had better properties.
Examples 5-7 compared to examples 8-11, when the kaolin to recycled glass frit weight ratio ranges from (2-3): 1, the weight ratio range of the regenerated glass block to the regenerated glass powder is (4-6): 1, the prepared concrete has better performances.
As can be seen from Table 3, in comparative example 1, compared with examples 1-13, the mechanical properties of the concrete can be effectively improved and the thermal insulation effect (i.e., the thermal conductivity can be reduced) can be improved by adding the regenerated glass blocks, the regenerated glass powder, the kaolin and the polyvinyl butyral resin.
As can be seen from Table 3, in comparison with comparative example 1 and examples 1 to 13, in comparative example 2, only the waste tempered glass blocks are added more than the concrete prepared in comparative example 1, and although the heat preservation effect can be increased, the breaking strength and the compressive strength are reduced, and the self-explosion phenomenon of the tempered glass occurs. The pretreatment of the waste toughened glass and the addition of the polyvinyl butyral resin are necessary, so that the self-explosion rate of the toughened glass can be reduced, and the toughened glass can be better mixed with other substances in concrete.
As can be seen from Table 3, in comparative example 3, compared with examples 1-13, the mechanical properties of the concrete can be effectively improved by adding the recycled glass powder.
As can be seen from Table 3, in comparative examples 4 and 5, compared with examples 1 to 13, the joining of the recycled glass blocks to the concrete can be improved and the recycled glass blocks can be easily and uniformly dispersed in the concrete after the polyvinyl butyral resin is added, but if the recycled glass blocks and the polyvinyl butyral resin are not mixed in advance so that the polyvinyl butyral resin is coated on the surface of the recycled glass blocks, but the polyvinyl butyral resin is directly poured into the mixture, the mechanical properties of the concrete prepared in this way are not good enough.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. The recycled aggregate concrete is characterized by comprising the following components in parts by weight:
250-300 parts of cement;
50-60 parts of fly ash;
100-110 parts of mineral powder;
300-350 parts of recycled aggregate;
200 portions and 250 portions of regenerated glass blocks;
30-50 parts of regenerated glass powder;
100-110 parts of kaolin;
10-15 parts of polyvinyl butyral resin;
10-12 parts of a water reducing agent;
180-190 parts of water;
the recycled aggregate is waste concrete fragments, and the diameter range of the recycled aggregate is 5-8 cm;
the regenerated glass block is a waste toughened glass block, the diameter range of the regenerated glass block is 10-20mm, and the regenerated glass block is prepared by the following method:
s1: crushing the waste toughened glass, screening waste toughened glass blocks with the diameter range of 10-20mm, and washing and drying the screened waste toughened glass blocks;
s2: heating the waste toughened glass block to 220 ℃ at 200-;
the regenerated glass powder is waste toughened glass powder, the diameter range of the regenerated glass powder is 0.1-0.5mm, and the regenerated glass powder is prepared by the following method:
s1: crushing the waste toughened glass, screening waste toughened glass powder with the diameter range of 0.1-0.5mm, washing and drying the screened waste toughened glass powder;
s2: mixing the powdery silicon dioxide and the waste toughened glass powder in a proportion of 1: and (2-3), immersing the mixture in a saturated solution of sodium dodecyl sulfate after uniform mixing, drying and drying after ultrasonic treatment for 20-30min, wherein the drying temperature is lower than 120 ℃.
2. The recycled aggregate concrete according to claim 1, wherein the kaolin is modified kaolin, which is prepared by the following method:
s1: calcining the kaolin for 2 hours at the calcining temperature of 450-500 ℃, and cooling to room temperature after calcining;
s2: mixing the calcined kaolin and the nano zinc oxide powder, wherein the weight ratio of the calcined kaolin to the nano zinc oxide powder is (30-35): 1, uniformly mixing, pouring into deionized water, boiling and keeping for 1-2h, cooling to room temperature, and centrifugally separating and drying to obtain the modified kaolin.
3. The recycled aggregate concrete of claim 1, wherein the water reducing agent is a polycarboxylic acid water reducing agent.
4. The recycled aggregate concrete according to claim 1, wherein the cement is ordinary portland cement.
5. The recycled aggregate concrete according to claim 1, wherein the kaolin and the recycled glass powder are in a weight ratio ranging from (2-3): 1.
6. the recycled aggregate concrete according to claim 1, wherein the weight ratio of the recycled glass blocks to the recycled glass powder is (4-6): 1.
7. the method for preparing recycled aggregate concrete according to any one of claims 1 to 6, comprising the steps of:
the method comprises the following steps: mixing the regenerated glass block with polyvinyl butyral resin, heating while stirring to make the temperature reach 60-65 ℃, stirring for 10-20min to make the surface of the regenerated glass block coated with polyvinyl butyral resin;
step two: uniformly mixing cement, fly ash, mineral powder, recycled aggregate, recycled glass powder, kaolin and a water reducing agent, adding water into the mixture, and stirring for 2-3 min;
step three: and (3) within 2min, pouring the substance prepared in the step one into the mixed substance prepared in the step two, stirring while adding, and then continuously stirring for 5-7min to uniformly mix the substances to obtain the recycled aggregate concrete.
8. The method for preparing recycled aggregate concrete according to claim 7, wherein in the first step, the temperature of the mixture is 60 ℃ and the stirring time is 15 min.
9. The method for preparing recycled aggregate concrete according to claim 7, wherein in the second step, the stirring time is 2.5 min.
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