CN110563370B - Production process for preparing recycled aggregate from waste concrete - Google Patents
Production process for preparing recycled aggregate from waste concrete Download PDFInfo
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- CN110563370B CN110563370B CN201910895793.0A CN201910895793A CN110563370B CN 110563370 B CN110563370 B CN 110563370B CN 201910895793 A CN201910895793 A CN 201910895793A CN 110563370 B CN110563370 B CN 110563370B
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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
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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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
- 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
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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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
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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
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Abstract
The invention relates to a production process for preparing recycled aggregate from waste concrete, which comprises the following preparation processes: s1: pretreatment: firstly, carrying out wet spraying treatment and epidemic prevention treatment on the waste concrete blocks, and then hammering the waste concrete blocks to ensure that the diameter length of the hammered concrete blocks is less than 50 mm; s2: screening treatment: screening the pretreated S1; s3: crushing treatment: crushing the waste concrete blocks subjected to screening treatment in the step S2 to prepare recycled aggregate; s4: strengthening treatment: reinforcing the recycled aggregate in S3; s5: and conveying the reinforced recycled aggregate to a storage bin for storage. The waste concrete is pretreated, screened, crushed, strengthened and dried to be collected to prepare the recycled aggregate, so that the waste concrete is effectively utilized, the waste of resources is reduced, and the utilization rate of energy is improved.
Description
Technical Field
The invention relates to the technical field of recycled aggregate preparation, in particular to a production process for preparing recycled aggregate from waste concrete.
Background
With the development of society, various buildings and construction projects are increasing, and concrete members are widely applied to pole tower structures, industrial plants and columns and foundation piles of civil buildings. Along with the transformation of cities, a large amount of waste buildings in the cities form construction wastes, and the treatment of the construction wastes not only needs a large-area storage yard, but also costs a large amount of manpower and material resources. With the development of construction science, effective utilization of construction waste becomes a new topic.
Disclosure of Invention
The invention aims to provide a production process for preparing recycled aggregate from waste concrete, which is used for preparing the waste concrete into the recycled aggregate, so that the waste concrete is convenient to recycle, the waste of resources is reduced, and the utilization rate of energy is improved.
The above object of the present invention is achieved by the following technical solutions:
a production process for preparing recycled aggregate from waste concrete comprises the following preparation processes:
s1: pretreatment: firstly, carrying out wet spraying treatment and epidemic prevention treatment on the waste concrete blocks, and then hammering the waste concrete blocks to ensure that the diameter length of the hammered concrete blocks is less than 50 mm;
s2: screening treatment: screening the pretreated S1;
s3: crushing treatment: crushing the waste concrete blocks subjected to screening treatment in the step S2 to prepare recycled aggregate;
s4: strengthening treatment: reinforcing the recycled aggregate in S3;
s5: and conveying the reinforced recycled aggregate to a storage bin for storage.
Through adopting above-mentioned technical scheme, spout wet processing to abandonment concrete piece in the S1, prevent when the hammering concrete, the dust is raised, influences the environment of mill. Meanwhile, the dust attached to the concrete block is prevented from being raised when the concrete is transported, and the factory environment and the respiratory health of operators are prevented from being influenced. And the concrete is subjected to epidemic prevention treatment to prevent bacteria from being attached to the concrete block, thereby influencing the body safety of operators.
In S1, the large concrete block is hammered into small concrete blocks with the diameter length smaller than 50mm, so that the post-processing of the concrete block is facilitated, the steel bars in the concrete block, the wood and the like are quickly separated from the concrete, and the post-processing of workers is facilitated.
And in the S2 screening treatment, impurities such as steel bars, wood, rubber and the like of the concrete and the concrete block are separated, so that the purity of the concrete block is improved.
S3 crushing treatment, the concrete block is crushed to prepare recycled aggregate.
Because the edges and corners of the recycled concrete aggregate obtained by crushing the waste concrete and the waste bricks are too many, most recycled aggregates are needle-shaped objects, and micro cracks can be generated in the aggregates in the crushing process of the recycled aggregates. Meanwhile, a part of old mortar is generally adhered to the surface of the recycled aggregate, so that the recycled aggregate has the characteristics of large crushing index, high water absorption, large porosity, low apparent density and the like compared with a natural aggregate, and the application range of the recycled aggregate and the strength of recycled concrete are influenced.
The strength of the recycled aggregate is improved and the water absorption rate and the gap rate of the recycled aggregate are reduced by performing strengthening treatment on the recycled aggregate, so that the application range of the recycled aggregate and the strength of recycled concrete are improved.
The recycled aggregate is prepared by pretreating, screening, crushing and strengthening the waste concrete, so that the waste concrete is effectively utilized, the waste of resources is reduced, and the utilization rate of energy is improved.
The invention is further configured to: the strengthening treatment of the recycled aggregate comprises the following process steps:
1) putting the recycled aggregate prepared in the step S3 into a biological assistant, soaking for 1d, stirring for 20min every 2 hours, taking out the recycled aggregate, and putting into a constant-temperature and constant-humidity environment for curing for 3 d;
2) drying the treated recycled aggregate at the temperature of 20-25 ℃;
3) immersing the dried recycled aggregate in a first auxiliary agent, performing vacuum pressurization for 2 hours, taking out the recycled aggregate, and drying the recycled aggregate at 20-25 ℃;
4) and spraying a second auxiliary agent on the surface of the dried recycled aggregate, continuously stirring, and then drying the recycled aggregate at 20-25 ℃.
The invention is further configured to: the biological additive comprises the following raw materials in percentage: 20-30% of bacterial liquid, 10-20% of gelatin, 10-20% of gum arabic, 20-30% of nutrient solution and the balance of water;
the nutrient solution comprises the following raw materials in percentage by weight: 16-20% of glucose, 6-10% of histidine, 3-7% of isoleucine, 4-8% of tryptophan, 10-14% of sodium chloride, 20-24% of peptone and the balance of water;
the bacterial liquid adopts 50-70% of bacterial content, and the bacterial strain adopted by the bacterial liquid is bacillus firmus.
By adopting the technical scheme, the bacillus firmus can carry out mineralization reaction. The mineralization reaction can generate sticky precipitated crystals, so that the adhesive cracks are filled, the aim of repairing concrete cracks is fulfilled, the strength of the recycled aggregate is improved, and the water absorption rate and the porosity of the recycled aggregate are reduced.
Because the bacillus firmus has strong vitality, can resist low temperature of-60 ℃, high temperature of +280 ℃, strong acid, strong alkali, bacteria, disinfection, high oxygen and low oxygen in a non-wet state.
Gelatin and gum arabic are added into the biological additive to improve the viscosity of the biological additive, so that the bacteria liquid can be better attached to the recycled aggregate, and the repair effect of the recycled aggregate is improved.
Meanwhile, gelatin is a hydrolysate of collagen, and is a high protein without fat. The gum arabic mainly contains high molecular polysaccharides and calcium, magnesium and potassium salts thereof, and mainly comprises arabinose, galactose, glucuronic acid, etc. Can provide certain nutrient substances for the bacillus firmus.
Histidine can be used as a proton donor and a proton acceptor to adjust the pH value of the biological additive, so that the pH value of the biological additive tends to be balanced, and the influence on the survival rate of bacteria caused by overhigh or overlow pH value of the biological additive is prevented.
Isoleucine can be decomposed to produce glucose, so that the bacteria can obtain nutrition conveniently, and the survival rate of the bacteria is improved.
Tryptophan can absorb ultraviolet ray, prevent bacteria death after being irradiated by light, and improve the survival rate of bacteria.
Meanwhile, histidine, isoleucine and tryptophan are amino acids, so that certain nutrient substances can be provided for bacteria, and the survival rate of the bacteria is improved.
Glucose and peptone are used to provide nutrients to the bacteria for their survival.
The sodium chloride is used for adjusting the concentration of the nutrient solution, and is convenient for bacteria to exchange substances.
The invention is further configured to: and S3, when the recycled aggregate is soaked by using the biological additive in the step 1, introducing oxygen to the bottom of the soaking container.
By adopting the technical scheme, although the bacillus firmus can survive in the anaerobic environment, the bacillus firmus has slow activity in the anaerobic environment and does not have violent activity in the aerobic environment. Therefore, when the recycled aggregate is soaked, bacteria generally gather in an environment with sufficient oxygen on the surface of the container, so that the adhesion amount of the bacteria of the recycled aggregate precipitated at the bottom of the container is influenced, and the repairing effect of the gap of the recycled aggregate is influenced.
Oxygen is introduced into the bottom of the soaking container during soaking, so that bacteria cannot gather on the surface of the container, the bacteria adhesion amount on the surface of the recycled aggregate is increased, and the repairing effect of the recycled aggregate gap is improved.
The invention is further configured to: the first auxiliary agent comprises the following raw materials in percentage by weight: 16-20% of nano silicon dioxide, 10-14% of nano calcium carbonate, 26-30% of polyvinyl alcohol, 10-14% of water glass, 0.6-1% of dispersing agent and the balance of water.
By adopting the technical scheme, the mechanical strength of the recycled aggregate can be improved by adding the nano silicon dioxide, so that the strength of the recycled aggregate is improved, and the crushing index of the recycled aggregate is reduced.
The function of the nano calcium carbonate is similar to that of the nano silicon dioxide, so that the use amount of the nano silicon dioxide can be reduced by adding the nano calcium carbonate, and the production cost is reduced. Meanwhile, the nano calcium carbonate can also react with bacterial liquid, so that the strength of the recycled aggregate is improved.
The polyvinyl alcohol can penetrate into the recycled coarse aggregate to fill the pores and cracks of the recycled coarse aggregate, and a film is formed to cover the pores on the surface of the recycled coarse aggregate, and the film has certain hydrophilicity, so that under the action of water in the concrete, the film on the surface can be gradually dissolved under the action of a strong alkaline solution after a certain period of time, and the growth and development of cement hydration products and the bonding of new and old slurry in an interface transition area are not hindered.
The sodium silicate has certain viscosity, so that the adhesion effect of the first auxiliary agent on the recycled aggregate can be improved, and the strength of the recycled aggregate is improved. And the added water glass can improve the compressive strength and the frost resistance of the recycled concrete.
The dispersing agent is added, so that the dispersing effect of each raw material can be improved, and the strength of the recycled aggregate is improved. The dispersant is dispersant MF produced by Zhejiang Longsheng group Limited company.
The invention is further configured to: the second auxiliary agent comprises the following raw materials in percentage by weight: 30-50% of cement, 10-14% of kim powder, 10-14% of fly ash, 3-7% of basalt fiber, 0.6-1% of polycarboxylic acid water reducing agent and the balance of water.
By adopting the technical scheme, the cement is common portland cement in the market and is an inorganic gel material.
kim powder is a cement-based chemical admixture that reacts with unhydrated particles to produce millions of elongated, hairlike crystals in the concrete, filling all remaining holes and gaps. The treated concrete is resistant to penetration by water currents and water-borne chemicals. And k im is unique in that it has an increasing behavior over time, and once moisture has penetrated it stimulates the formation of more needle-like crystals, blocking the ingress of water. This property allows kim concrete to have the ability to self-heal cracks even after years. Thereby endowing the recycled aggregate with good water resistance and use
The addition of the fly ash can improve the durability and mechanical property of the recycled aggregate and has good effect of improving the structure of an interface region.
The nano silicon dioxide can activate the activity of the fly ash with low activity in hydration reaction, exert small-size effect, and improve the distribution of pores in the recycled aggregate while filling pores, thereby improving the strength of the recycled aggregate and reducing the crushing index of the recycled aggregate.
The added basalt fiber can improve the strength and toughness of the recycled aggregate, and can improve the microstructure of the sprayed cement slurry. The mortar is distributed in the cement slurry uniformly in a random direction to form a three-dimensional space framework with a stable structure, so that the mechanical property of the slurry wrapped outside the recycled aggregate can be improved, and the cracking of a slurry shell is inhibited.
The polycarboxylate superplasticizer is used for reducing the using amount of water, and can be used as a dispersing agent to improve the dispersing effect of various raw materials. The polycarboxylate water reducer is a LonS-P type polycarboxylate water reducer produced by Zhejiang Longsheng group Limited company.
In the step 1, the recycled aggregate is immersed in the biological assistant for repairing gaps of the recycled aggregate and balancing porosity and shape in the recycled aggregate, so that the strength of the recycled aggregate is improved and the water absorption of the recycled aggregate is reduced.
Meanwhile, after soaking for 2 hours, the recycled aggregate is taken out and placed in a constant-temperature and constant-humidity environment for curing for 3 days, so that the efficiency of mineralization reaction of bacteria is improved, gaps and pores of the recycled aggregate are repaired, and the strength of the recycled aggregate is improved. And the propagation speed of bacteria is improved, the surface of the recycled aggregate is ensured to contain sufficient bacteria and activity of the bacteria, and the subsequent operation is facilitated.
And 2, drying the recycled aggregate at 20-25 ℃ to prevent bacterial inactivation.
And step 3, further repairing gaps and porosity of the recycled aggregate. Meanwhile, the compressive strength and the mechanical property of the recycled aggregate are improved, and the frost resistance of the recycled aggregate is improved. And a protective film is formed outside the outer surface of the recycled aggregate to protect the bacteria liquid attached to the recycled aggregate and prevent the bacteria liquid from being inactivated, so that the mineralization reaction of the bacteria liquid is always carried out, and the slow release effect is achieved.
When the recycled concrete prepared by using the recycled aggregate has cracks, the bacteria liquid attached to the recycled aggregate can generate mineralization reaction due to contact with water and air, so that the recycled concrete is repaired, and the strength and the anti-cracking effect of the recycled concrete are improved.
And in the step 3, the method is carried out in a vacuum pressurization environment, so that bacteria liquid attached to the surface of the recycled aggregate is prevented from being dissolved in the first auxiliary agent, and the repair of the recycled aggregate is influenced.
And 4, wrapping cement slurry outside the recycled aggregate, further protecting the bacterial liquid attached to the recycled aggregate, preventing the bacterial liquid from being inactivated, and achieving a slow-release effect. Meanwhile, the bonding effect of the recycled aggregate and the cement is improved, the structure of an interface area is improved, and the recycled aggregate and the concrete are conveniently bonded.
The bacteria liquid is attached to the recycled aggregate, and the first auxiliary agent and the cement slurry are wrapped on the outer surface of the recycled aggregate to protect the bacteria liquid, so that the slow release effect is achieved, the bacteria liquid can effectively repair the recycled aggregate and the recycled concrete for a long time, and the strength of the recycled aggregate and the recycled concrete is improved. Meanwhile, the recycled concrete is recycled conveniently, the recycled concrete is convenient to treat later, and the working efficiency is improved.
The invention is further configured to: and in the step 5 of S3, CO is introduced when the recycled aggregate is dried2，CO2The introduction amount of (2) is 3-5m3/h。
By adopting the technical scheme, CO2Can react with the product of cement hydration to generate calcium carbonate and silica gel. Calcium carbonate is an insoluble calcium salt, so that hydrated cement slurry and reaction generated can be filled in pores, and the compactness and strength of the recycled aggregate are improved.
The invention is further configured to: the screening treatment comprises the following process steps:
a. manually sorting out the wastes such as metal, rubber, plastic, wood and the like with large volume in the waste concrete blocks pretreated by the S1;
b. conveying the primarily selected waste concrete blocks to a vibrating screen, and screening out dust and the like with the particle size smaller than 5mm by the vibrating screen;
c. placing the screened waste concrete blocks into a clean water tank, cleaning the waste concrete blocks by ultrasonic waves for 30min, standing the waste concrete blocks for 30min after cleaning, removing suspended matters suspended above the clean water tank, and fishing out the concrete blocks and then drying the concrete blocks;
d. and conveying the waste concrete blocks to a magnetic separation device, and removing metal substances in the waste concrete blocks.
By adopting the technical scheme, in the step a, the waste gas concrete block recycling device is used for recycling metal, rubber, plastic and wood in the waste gas concrete block, and is convenient to use later.
And c, removing the rubber, the plastic and the wood with smaller volume in the waste gas concrete block, removing the dust attached to the waste gas concrete block, and removing the loose cement paste attached to the surface of the aggregate, so that the waste gas concrete block is convenient to treat.
The invention is further configured to: the crushing treatment comprises the following process steps:
a. carrying out primary crushing treatment on the waste concrete blocks subjected to the S2 screening treatment, conveying the waste concrete blocks subjected to the primary crushing treatment to a vibrating screen, and screening out dust and the like with the particle size smaller than 5mm by the vibrating screen;
b. conveying the waste concrete blocks subjected to the primary crushing treatment to a magnetic separation device again, and removing metal objects such as reinforcing steel bars and the like in the crushed waste concrete blocks through the magnetic separation device;
c. carrying out secondary crushing treatment on the waste concrete blocks without the metal substances;
d. grinding the waste concrete blocks subjected to the secondary crushing treatment;
e. c, conveying the ground waste concrete blocks to a screening device for screening, wherein the waste concrete blocks passing through the screening device are recycled aggregate, and the waste concrete blocks not passing through the screening device are subjected to steps c, d and e;
d. transporting the recycled aggregate to a winnowing device, and carrying out grading treatment by wind power. Separating the light drift from the surface of the recycled aggregate.
Through adopting above-mentioned technical scheme, through carrying out the secondary crushing processing to the waste gas concrete piece, improve the effect of getting rid of waste gas concrete piece surface cement thick liquids, improve the intensity of regeneration aggregate.
And c, grinding the waste concrete blocks subjected to the secondary crushing treatment to remove edges and corners on the outer surface of the recycled aggregate and improve the smoothness of the recycled aggregate.
The winnowing device comprises a fan and a dust collector, the fan blows dust and other light drifted objects from the surface of the recycled aggregate, and the dust collector absorbs the dust and other light drifted objects and then collects the dust and other light drifted objects, so that the dust can be conveniently recycled.
The invention is further configured to: the particle size of the recycled aggregate is 5-20 mm.
By adopting the technical scheme, the particle size of the recycled aggregate is prevented from being too small, so that the recycled aggregate is agglomerated when the recycled aggregate is subjected to strengthening treatment, and the strengthening of the recycled aggregate is influenced. Or the particle size of the recycled aggregate is too large, which affects the strengthening effect of the strengthening treatment.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the waste concrete is subjected to pretreatment, screening treatment, crushing treatment, strengthening treatment and drying collection to prepare the recycled aggregate, so that the waste concrete is effectively utilized, the waste of resources is reduced, and the utilization rate of energy is improved;
2. the strength of the recycled aggregate is improved and the water absorption rate and the gap rate of the recycled aggregate are reduced by performing strengthening treatment on the recycled aggregate, so that the application range of the recycled aggregate and the strength of recycled concrete are improved;
3. the recycled aggregate soaked with the biological additives is sequentially immersed in the first additive and the second additive to form a layer of protective film on the outer surface of the recycled aggregate, so that bacterial liquid attached to the surface of the recycled aggregate is prevented from being inactivated, the aim of slow release of the bacterial liquid is fulfilled, the bacterial liquid can effectively repair the recycled aggregate and the recycled concrete for a long time, and the strength of the recycled aggregate and the recycled concrete is improved.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
referring to fig. 1, the production process for preparing recycled aggregate from waste concrete disclosed by the invention comprises the following preparation processes:
s1: pretreatment: firstly, carrying out wet spraying treatment and epidemic prevention treatment on the waste concrete blocks, and then hammering the waste concrete blocks to ensure that the diameter length of the hammered concrete blocks is less than 50 mm;
s2: the screening treatment comprises the following process steps:
a. manually sorting out the wastes such as metal, rubber, plastic, wood and the like with large volume in the waste concrete blocks pretreated by the S1;
b. conveying the primarily selected waste concrete blocks to a vibrating screen, and screening out dust and the like with the particle size smaller than 5mm by the vibrating screen;
c. placing the screened waste concrete blocks into a clean water tank, cleaning the waste concrete blocks by ultrasonic waves for 30min, standing the waste concrete blocks for 30min after cleaning, removing suspended matters suspended above the clean water tank, and fishing out the concrete blocks and then drying the concrete blocks;
d. conveying the waste concrete blocks into a magnetic separation device, and removing metal substances in the waste concrete blocks;
s3: the crushing treatment comprises the following process steps:
a. carrying out primary crushing treatment on the waste concrete blocks subjected to the S2 screening treatment, conveying the waste concrete blocks subjected to the primary crushing treatment to a vibrating screen, and screening out dust and the like with the particle size smaller than 5mm by the vibrating screen;
b. conveying the waste concrete blocks subjected to the primary crushing treatment to a magnetic separation device again, and removing metal objects such as reinforcing steel bars and the like in the crushed waste concrete blocks through the magnetic separation device;
c. carrying out secondary crushing treatment on the waste concrete blocks without the metal substances;
d. grinding the waste concrete blocks subjected to the secondary crushing treatment;
e. c, conveying the ground waste concrete blocks to a screening device for screening, wherein the waste concrete blocks passing through the screening device are recycled aggregate, and the waste concrete blocks not passing through the screening device are subjected to steps c, d and e; the particle size of the prepared recycled aggregate is 5-20 mm;
d. transporting the recycled aggregate to a winnowing device, and separating the light drifts from the surface of the recycled aggregate through wind power grading treatment;
s4: strengthening treatment: reinforcing the recycled aggregate in S3;
the strengthening treatment comprises the following process steps:
1) putting the recycled aggregate prepared in the step S3 into a biological assistant, soaking for 1d, stirring for 20min every 2 hours, and introducing oxygen to the bottom of a soaking container; after soaking, taking out the recycled aggregate, and putting the recycled aggregate into a constant-temperature and constant-humidity environment for curing for 3 d;
preparing a biological assistant: uniformly mixing 25% of bacterial liquid, 15% of gelatin, 15% of gum arabic, 25% of nutrient solution and 20% of water to obtain a biological additive;
preparing a nutrient solution: uniformly mixing 18% of glucose, 8% of histidine, 5% of isoleucine, 6% of tryptophan, 12% of sodium chloride, 22% of peptone and 29% of water to prepare a nutrient solution;
the bacterial liquid adopts 60 percent of bacterial content, and the bacterial strain adopted by the bacterial liquid is bacillus firmus;
the water for preparing the biological additive and the nutrient solution is deionized water;
2) drying the treated recycled aggregate at 25 ℃;
3) immersing the dried recycled aggregate in a first auxiliary agent, performing vacuum pressurization for 2 hours, taking out the recycled aggregate, and drying the recycled aggregate at 25 ℃;
preparing a first auxiliary agent: uniformly mixing 18% of nano silicon dioxide, 12% of nano calcium carbonate, 28% of polyvinyl alcohol, 12% of water glass, 0.8% of dispersing agent and 29.2% of water to prepare a first auxiliary agent;
4) spraying a second auxiliary agent on the surface of the dried recycled aggregate, and continuously stirring; then drying the recycled aggregate at 25 ℃, and introducing CO during drying2，CO2The introduction amount of (2) is 4m3/h；
Preparing a second auxiliary agent: uniformly mixing 40% of cement, 12% of kim powder, 12% of fly ash, 5% of basalt fiber, 0.8% of polycarboxylic acid water reducing agent and 30.2% of water to prepare a second auxiliary agent;
s5: and conveying the reinforced recycled aggregate to a storage bin for storage.
Examples 2-5 differ from example 1 in that the bio-adjuvant comprises the following raw materials in weight percent:
examples 6 to 9 differ from example 1 in that the nutrient solution comprises the following raw materials in weight percent:
examples 10 to 13 differ from example 1 in that the bacterial liquid contents are shown in the following table:
| examples | Example 10 | Example 11 | Example 12 | Example 13 |
| Bacteria content | 50％ | 55％ | 65％ | 70％ |
Examples 14-17 differ from example 1 in that the first aid comprises the following raw materials in weight percent:
examples 18 to 21 differ from example 1 in that the second auxiliary comprises the following raw materials in weight percent:
examples 22 to 25 differ from example 1 in that CO2The amount of (A) introduced is shown in the following table:
| examples | Example 22 | Example 23 | Example 24 | Example 25 |
| Introduction amount/(m)3/h) | 3 | 3.5 | 4.5 | 5 |
Comparative example:
comparative example 1 is different from example 1 in that the recycled aggregate was not subjected to S4 strengthening treatment;
the difference between the comparative example 2 and the example 1 is that the recycled aggregate is only soaked in the biological additive when being subjected to the strengthening treatment, and the steps 3 and 4 are not carried out;
the difference between the comparative example 3 and the example 1 is that the recycled aggregate is only soaked in the first auxiliary agent when being subjected to the strengthening treatment, and only the step 3 is carried out;
the difference between the comparative example 4 and the example 1 is that the recycled aggregate is only soaked in the second auxiliary agent when being subjected to the strengthening treatment, and only the step 4 is carried out;
the difference between the comparative example 5 and the example 1 is that oxygen is not introduced into the bottom of the soaking container when the recycled aggregate is soaked in the biological additive;
the difference between the comparative example 6 and the example 1 is that the recycled aggregate is soaked in the second auxiliary agent, and CO is not introduced during drying2。
The recycled aggregates prepared in examples 1 to 3 and comparative examples 1 to 6 were mixed in the following proportions: ordinary Portland cement 280kg/m360kg/m of fly ash3448kg/m of river sand3Machine-made sand 300kg/m31122kg/m of recycled aggregate3160kg/m of water3The concrete is mixed and poured into concrete blocks of 2m x 0.25 m.
Comparative example 7 differs from example 1 in the following proportions: ordinary Portland cement 280kg/m360kg/m of fly ash3448kg/m of river sand3Machine-made sand 300kg/m31122kg/m of crushed stone3160kg/m of water3The concrete is mixed and poured into concrete blocks of 2m x 0.25 m.
The concrete blocks prepared in examples 1 to 3 and comparative examples 1 to 7 were subjected to the following tests:
1) the concrete blocks prepared in examples 1 to 3 and comparative examples 1 to 7 were tested for their compressive strength and flexural strength using a concrete pressure tester, and the results are shown in the table.
2) The concrete blocks prepared in examples 1 to 3 and comparative examples 1 to 7 were cured in clean water and brine (30% by mass aqueous sodium chloride solution) to a prescribed age, and the flexural strength (MPa) of the concrete was measured by a concrete pressure tester and the resistance to chloride ion attack was characterized by the flexural strength, and the results are shown in the table.
The concrete pressure testing machine is a YES/CX type pressure testing machine sold by Jinxin testing machine manufacture Co.
As can be seen from the above table, it is understood that the compressive strength and the flexural strength of the recycled concrete can be improved by reinforcing the recycled aggregate, and the water absorption of the recycled concrete is reduced, and the recycled concrete has good corrosion resistance, as is clear from the comparison of examples 1 to 3 with comparative example 1. Therefore, the strength and durability of the recycled aggregate can be effectively improved by performing the strengthening treatment on the recycled aggregate, so that the recycled aggregate has good corrosion resistance, and the water absorption of the recycled aggregate is reduced.
As can be seen from comparison between examples 1-3 and comparative examples 1-4, the strength of the recycled aggregate can be effectively improved and the water absorption of the recycled aggregate can be reduced by soaking the recycled aggregate in the biological assistant. After the biological additives are soaked, the recycled aggregate is sequentially immersed in the first additives and the second additives, so that the strength of the recycled aggregate can be improved again, and the water absorption of the recycled aggregate is reduced. And it can be understood from the data of comparative example 2 that the recycled aggregate adhered to the recycled aggregate when it was immersed only in the bio-additive
And can protect the strain to a certain extent, so as to bring the slow release effect.
As is clear from comparison of examples 1 to 3 with comparative example 5, when the recycled aggregate was immersed in the bio-additive, the strength of the recycled concrete was improved and the water absorption thereof was lowered by introducing oxygen into the bottom of the immersion container. Therefore, when the recycled aggregate is soaked in the biological assistant, oxygen is introduced into the bottom of the soaking container, so that the adhesion amount of bacteria on the recycled aggregate can be increased, and the strength of the recycled aggregate is improved.
As can be seen from comparison between examples 1 to 3 and comparative example 6, when the recycled aggregate is soaked in the second auxiliary agent, CO is introduced during drying2The strength of the recycled concrete can be improved, and the water absorption of the recycled concrete is reduced. Therefore, when the recycled aggregate is soaked in the second auxiliary agent, CO is introduced during drying2So that CO is present2And the recycled aggregate reacts with the second auxiliary agent, so that the strength and compactness of the recycled aggregate are improved.
As can be seen from comparison between examples 1 to 3 and comparative example 7, the strength of the recycled concrete is not greatly different from that of the concrete made of natural crushed stone by reinforcing the recycled aggregate, which means that the use effect and the use range of the recycled concrete can be effectively improved by reinforcing the concrete, thereby facilitating the recycling of the waste concrete, reducing the waste of resources and improving the utilization rate of energy.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (7)
1. A production process for preparing recycled aggregate from waste concrete is characterized by comprising the following steps: the preparation method comprises the following preparation processes:
s1: pretreatment: firstly, carrying out wet spraying treatment and epidemic prevention treatment on the waste concrete blocks, and then hammering the waste concrete blocks to ensure that the diameter length of the hammered concrete blocks is less than 50 mm;
s2: screening treatment: screening the pretreated waste concrete block in the step S1;
s3: crushing treatment: crushing the waste concrete blocks subjected to screening treatment in the step S2 to prepare recycled aggregate;
s4: strengthening treatment: reinforcing the recycled aggregate in S3;
s5: conveying the reinforced recycled aggregate to a storage bin for storage;
the strengthening treatment of the recycled aggregate comprises the following process steps:
1) putting the recycled aggregate prepared in the step S3 into a biological assistant, soaking for 1d, stirring for 20min every 2 hours, taking out the recycled aggregate, and putting into a constant-temperature and constant-humidity environment for curing for 3 d;
2) drying the treated recycled aggregate at the temperature of 20-25 ℃;
3) immersing the dried recycled aggregate in a first auxiliary agent, performing vacuum pressurization for 2 hours, taking out the recycled aggregate, and drying the recycled aggregate at 20-25 ℃;
4) spraying a second auxiliary agent on the surface of the dried recycled aggregate, continuously stirring, and then drying the recycled aggregate at 20-25 ℃;
the first auxiliary agent comprises the following raw materials in percentage by weight: 16-20% of nano silicon dioxide, 10-14% of nano calcium carbonate, 26-30% of polyvinyl alcohol, 10-14% of water glass, 0.6-1% of dispersing agent and the balance of water;
the second auxiliary agent comprises the following raw materials in percentage by weight: 30-50% of cement, 10-14% of kim powder, 10-14% of fly ash, 3-7% of basalt fiber, 0.6-1% of polycarboxylic acid water reducing agent and the balance of water.
2. The process for producing recycled aggregate from waste concrete according to claim 1, wherein the process comprises the following steps: the biological additive comprises the following raw materials in percentage by weight: 20-30% of bacterial liquid, 10-20% of gelatin, 10-20% of gum arabic, 20-30% of nutrient solution and the balance of water;
the nutrient solution comprises the following raw materials in percentage by weight: 16-20% of glucose, 6-10% of histidine, 3-7% of isoleucine, 4-8% of tryptophan, 10-14% of sodium chloride, 20-24% of peptone and the balance of water;
the bacterial liquid adopts 50-70% of bacterial content, and the bacterial strain adopted by the bacterial liquid is bacillus firmus.
3. The process for producing recycled aggregate from waste concrete according to claim 1, wherein the process comprises the following steps: and S4, when the recycled aggregate is soaked by using the biological additive in the step 1, introducing oxygen to the bottom of the soaking container.
4. The process for producing recycled aggregate from waste concrete according to claim 1, wherein the process comprises the following steps: when the recycled aggregate is dried in the step 4 of S4, CO is introduced2，CO2The introduction amount of (2) is 3-5m3/h。
5. The process for producing recycled aggregate from waste concrete according to claim 1, wherein the process comprises the following steps: the screening treatment comprises the following process steps:
a. manually sorting out the metal, rubber, plastic and wood garbage with large volume in the waste concrete block pretreated by the S1;
b. conveying the primarily selected waste concrete blocks to a vibrating screen, and screening out dust with the particle size smaller than 5mm by the vibrating screen;
c. placing the screened waste concrete blocks into a clean water tank, cleaning the waste concrete blocks by ultrasonic waves for 30min, standing the waste concrete blocks for 30min after cleaning, removing suspended matters suspended above the clean water tank, and fishing out the concrete blocks and then drying the concrete blocks;
d. and conveying the waste concrete blocks to a magnetic separation device, and removing metal substances in the waste concrete blocks.
6. The process for producing recycled aggregate from waste concrete according to claim 1, wherein the process comprises the following steps: the crushing treatment comprises the following process steps:
a. carrying out primary crushing treatment on the waste concrete blocks subjected to the S2 screening treatment, conveying the waste concrete blocks subjected to the primary crushing treatment to a vibrating screen, and screening out dust with the particle size smaller than 5mm by the vibrating screen;
b. conveying the waste concrete blocks subjected to primary crushing treatment and screening to a magnetic separation device again, and removing steel bar metal objects in the crushed waste concrete blocks through the magnetic separation device;
c. carrying out secondary crushing treatment on the waste concrete blocks without the metal substances;
d. grinding the waste concrete blocks subjected to the secondary crushing treatment;
e. c, conveying the ground waste concrete blocks to a screening device for screening, wherein the waste concrete blocks passing through the screening device are recycled aggregate, and the waste concrete blocks not passing through the screening device are subjected to steps c, d and e;
d. and (4) conveying the recycled aggregate into a winnowing device, and separating the light drifts from the surface of the recycled aggregate through wind power grading treatment.
7. The process for producing recycled aggregate from waste concrete according to claim 1, wherein the process comprises the following steps: the particle size of the recycled aggregate is 5-20 mm.
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| CN114656206B (en) * | 2022-03-15 | 2022-09-30 | 郑州大学 | Nano-silica and basalt fiber synergistically enhanced recycled concrete and preparation method thereof |
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