CN112047679A - Recycled concrete and preparation method thereof - Google Patents
Recycled concrete and preparation method thereof Download PDFInfo
- Publication number
- CN112047679A CN112047679A CN202010834941.0A CN202010834941A CN112047679A CN 112047679 A CN112047679 A CN 112047679A CN 202010834941 A CN202010834941 A CN 202010834941A CN 112047679 A CN112047679 A CN 112047679A
- Authority
- CN
- China
- Prior art keywords
- parts
- concrete
- water
- recycled
- aggregate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The invention discloses recycled concrete and a preparation method thereof, belonging to the technical field of concrete and comprising the following components in parts by weight: 650 parts of regenerated coarse aggregate 550-containing material, 480 parts of fine aggregate 400-containing material, 420 parts of cement 350-containing material, 210 parts of water 175-containing material, 35-50 parts of silica fume, 3-5 parts of water reducing agent, 0.05-0.10 part of air entraining agent, 0.03-0.06 part of defoaming agent, 0.03-0.05 part of water-based stamping lubricant and 34-38 parts of hydroxypropyl methyl cellulose, wherein the particle size of the silica fume is less than 1 mu m. The recycled concrete and the preparation method thereof provided by the invention have the advantages that the strength and the impermeability of the recycled concrete can be improved, and the workability of the recycled concrete is improved.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to recycled concrete and a preparation method thereof.
Background
The regenerated concrete is prepared by crushing, cleaning and grading waste concrete blocks, mixing the crushed, cleaned and graded waste concrete blocks with a grading agent according to a certain proportion, partially or completely replacing natural aggregates (mainly coarse aggregates) such as sand stones and the like, and adding cement, water and the like. The recycled concrete can be combined into aggregates in the following cases: all aggregates are regenerated aggregates, the coarse aggregates are regenerated aggregates, the fine aggregates are natural sand, the coarse aggregates are natural gravel or pebbles, the fine aggregates are regenerated aggregates, and the regenerated aggregates replace part of the coarse aggregates or the fine aggregates.
The invention patent application with the publication number of CN109250978A discloses recycled concrete, which consists of the following raw materials in parts by weight: 330 portions of cement 230-containing material, 1300 portions of recycled aggregate 800-containing material, 400 portions of nickel-iron slag 200-containing material, 30-80 portions of superfine admixture, 2-5 portions of water reducing agent, 0.01-0.5 portion of retarder, 0.5-3 portions of shrinkage reducing agent, 0.1-1 portion of reinforcing agent, 0.01-0.05 portion of air entraining agent and 108.5-126 portions of water. The invention greatly utilizes solid wastes such as waste concrete, nickel-iron slag, ceramic tile polishing powder, titanium oxide waste and the like, reduces the exploitation of natural sand and stone, and is beneficial to the construction of ecological civilization.
In view of the above-mentioned related art, the inventors consider that there is a problem in that the recycled aggregate has a large porosity between recycled aggregates due to the fact that the recycled aggregate includes stones coated with mortar on the surface and a small amount of cement mortar which is independently agglomerated, and the surface of the cement mortar is rough and has many edges and corners; on the other hand, in the process of producing the recycled aggregate by crushing the waste concrete, a large number of micro cracks appear in the recycled aggregate due to the action of large external force, so that the porosity of the interior of the recycled aggregate is large, and the prepared recycled concrete has poor impermeability, strength and workability.
Disclosure of Invention
In view of the disadvantages of the prior art, a first object of the present invention is to provide a recycled concrete capable of improving the strength and impermeability of the recycled concrete and improving the workability of the recycled concrete.
In order to achieve the purpose, the invention provides the following technical scheme: the recycled concrete comprises the following components in parts by weight: 650 parts of regenerated coarse aggregate 550-containing material, 480 parts of fine aggregate 400-containing material, 420 parts of cement 350-containing material, 210 parts of water 175-containing material, 35-50 parts of silica fume, 3-5 parts of water reducing agent, 0.05-0.10 part of air entraining agent, 0.03-0.06 part of defoaming agent, 0.03-0.05 part of water-based stamping lubricant and 34-38 parts of hydroxypropyl methyl cellulose, wherein the particle size of the silica fume is less than 1 mu m.
By adopting the technical scheme, the hydroxypropyl methyl cellulose is dissolved in water to form a sticky and slippery polymer, and the attached micro silicon powder is filled in the gaps of the aggregate and coated on the surface of the aggregate, so that the internal pores of the concrete can be filled, the impermeability and strength of the concrete can be enhanced, a sticky and slippery film layer can be formed, the cementing and lubricating effects can be realized, and the workability of the concrete can be improved.
The water-based stamping lubricant has strong permeability, can permeate into aggregates, reduces the friction force between the aggregates, improves the workability, and enhances the concrete strength by the water reducing agent.
Furthermore, the recycled coarse aggregate is waste concrete particles carrying an antibacterial agent, and the particle size of the waste concrete particles is 10-15mm and is continuously and intensively prepared.
By adopting the technical scheme, the antibacterial agent is filled in the waste concrete particles, so that the pores in the waste concrete particles can be reduced, the strength and the impermeability of the waste concrete particles are increased, the antibacterial agent can be slowly released, the long-acting antibacterial effect is achieved, the bacteria breeding and corrosion in the use process of the concrete are reduced, and the possibility of impermeability and strength is reduced. The 10-15mm waste concrete particles which are continuously assembled have high holding degree and lower porosity, are beneficial to uniform filling, improve the uniformity of strength and impermeability, and simultaneously can also improve the workability.
Further, the antibacterial agent is nano titanium oxide.
By adopting the technical scheme, the nano titanium oxide generates a strong oxidizing substance through photocatalysis to inactivate microbial cell tissues, so that the antibacterial property of the nano titanium oxide can be maintained for a long time, the requirement on the intensity of a light source is low, light can be absorbed and scattered, and the damage of the light to concrete is reduced.
Further, the composition also comprises 13-18 parts of octadecyl trimethyl ammonium chloride.
By adopting the technical scheme, one end of the molecular chain of the octadecyl trimethyl ammonium chloride contains a hydrophobic group and the other end of the molecular chain of the octadecyl trimethyl ammonium chloride contains a hydrophilic group with positive charge, and the octadecyl trimethyl ammonium chloride has a sterilization effect. In the alkaline environment in which the alkali-aggregate reaction occurs inside the concrete, the aqueous solution generally has negative charges, and the octadecyl trimethyl ammonium chloride with positive charges can form an inward hydrophilic group and an outward hydrophobic group arrangement on the surface of the matrix. The surface of the titanium oxide powder contains polar groups, and water molecules can be adsorbed on the surface of the titanium oxide powder, so that one end of octadecyl trimethyl ammonium chloride with a hydrophilic group is connected with the surface of the titanium oxide powder, one end of the octadecyl trimethyl ammonium chloride with a hydrophobic group extends out of a sticky and slippery membrane formed by hydroxypropyl methyl cellulose, and the sticky and slippery membrane formed by the hydroxypropyl methyl cellulose is punctured into a plurality of micropores. So that the titanium oxide powder can be released to the surface of the concrete for a long time through the micropores in the using process of the concrete, and the bacteriostasis efficiency is improved.
Further, the water reducing agent comprises 16-18 parts of an alkyl aryl sulfonic acid aldehyde naphthalene sulfonate condensate high-efficiency water reducing agent, 45-55 parts of ethylene oxide, 8-12 parts of urea, 5-8 parts of sodium sulfate and 30-40 parts of calcium lignosulfonate.
By adopting the technical scheme, the water reducing agent compounded by the components has higher water reducing efficiency, more fluidity of concrete mixture is increased, and better dispersion effect is achieved, so that the strength of concrete is higher, and more cement can be saved. And meanwhile, the method also has the capability of reducing the reduction of the fluidity along with time, and improves the workability.
Further, the air entraining agent is sodium alkyl benzene sulfonate.
By adopting the technical scheme, sodium alkyl benzene sulfonate is added to be compounded with other components, the introduced bubbles have good structure, small radius and high frost resistance index, and the slump, the fluidity and the plasticity of the concrete can be improved; the bleeding and segregation of the concrete are reduced, and the homogeneity of the concrete is improved; the heat diffusion and the conductivity coefficient of the concrete are reduced, the condition that the heat diffusion is increased due to the formation of micropores by adding octadecyl trimethyl ammonium chloride is improved, the volume stability of the concrete is improved, the weather resistance of a concrete structure is enhanced, and the frost resistance, the impermeability and the alkali-resistant aggregate reaction performance of the concrete are improved.
Further, the defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether.
By adopting the technical scheme, the poor-quality and overlarge air bubbles which are introduced in the concrete stirring process are eliminated by firstly using the polyoxyethylene polyoxypropylene pentaerythritol ether, and then the air entraining agent is added to introduce the air bubbles with good structure and small radius, so that the survival rate of the air bubbles playing a positive role in the concrete can be improved, and the possibility of adverse effect of the air bubbles on the concrete is reduced.
The second purpose of the invention is to provide a preparation method of the recycled concrete, which comprises the following steps: s1, crushing the concrete waste, and screening the obtained waste concrete particles;
s2, spreading the waste concrete particles on a grid plate, spraying and soaking for 5min by using tap water, and draining until no water drops to obtain a regenerated coarse aggregate;
s3, preparing a water reducing agent for later use;
s4, uniformly mixing the recycled coarse aggregate, the fine aggregate and the water-based stamping lubricant to obtain an aggregate mixture;
s5, adding hydroxypropyl methyl cellulose into water, completely dissolving, stirring uniformly, then adding silica fume, and mixing uniformly to obtain a filling solution;
s6, adding the cement into the filling solution, and uniformly stirring to obtain a gel mixture;
and s7, adding the gel mixture into the aggregate mixture, uniformly stirring, adding the defoaming agent, stirring for 5min, sequentially adding the water reducing agent and the air entraining agent, and stirring for 8min to obtain the recycled concrete.
According to the invention, by adopting the steps, the coarse aggregate, the fine aggregate and the water-based stamping lubricant are mixed to obtain the aggregate mixture, so that the aggregates are favorably and uniformly mixed, and the possibility of uneven distribution caused by the adhesion of gel substances is reduced. The water-based stamping lubricant reduces the friction force between coarse aggregate and fine aggregate and other components, and improves the workability of concrete. The waste concrete particles are soaked by tap water, so that the possibility that the construction and the performance of the concrete are influenced due to large water absorption caused by large surface pores when the waste concrete particles are mixed with the gel mixture is reduced.
Firstly, dissolving hydroxypropyl methylcellulose into water, then adding silica fume, which is beneficial to uniformly dispersing the silica fume in a hydroxypropyl methylcellulose aqueous solution, and then adding cement, wherein the hydroxypropyl methylcellulose can preliminarily adhere the silica fume to fill in the pores of cement particles, so that the strength and impermeability of the cement are improved; then adding the mixture into the aggregate mixture, attaching cement particles and filling the pores of the aggregate with the micro silica powder, improving the strength and the impermeability of the aggregate, and improving the workability of concrete due to filling the edges and corners on the surface of the recycled coarse aggregate.
Then, an air entraining agent is added to eliminate air bubbles with poor structure and overlarge diameter in the concrete introduced in the stirring process, so that the possibility that the strength and the impermeability of the concrete are influenced due to the fact that large holes are formed in the concrete is reduced. The water reducing agent is added to improve the slump and the strength of the concrete and reduce the using amount of the cement. And finally, the air entraining agent is added to introduce bubbles with excellent structure and smaller diameter, so that the strength of the concrete can be improved, and the impermeability can be ensured.
Further, the step s2 is: according to the weight portion, 80 portions of nano titanium oxide are dissolved in 1000 portions of deionized water, then waste concrete particles are added, the pH value is adjusted to be neutral, the mixture is stirred for 2 hours, and the mixture is filtered and drained until no water drops, so that the recycled coarse aggregate is obtained.
By adopting the technical scheme, the method not only can fill the pores of the recycled coarse aggregate and enhance the strength and impermeability, but also can carry the antibacterial agent to achieve the slow release effect and prolong the action time of the antibacterial agent.
Further, the step s3 is: and (3) sequentially adding ethylene oxide, urea, sodium sulfate and calcium lignosulfonate into the high-efficiency water reducing agent of the alkyl aryl sulfonic acid naphthalene sulfonic acid aldehyde condensate, then feeding the mixture into a drum mixer, and stirring the mixture for 115min at normal temperature and normal pressure to obtain the water reducing agent.
By adopting the technical scheme, the method has the advantages that,
in conclusion, the invention has the following beneficial effects:
1. hydroxypropyl methyl cellulose is dissolved in water to form a sticky and slippery polymer, and attached silica fume is filled in the gaps of the aggregate and wrapped on the surface of the aggregate, so that the internal pores of concrete can be filled, the impermeability and strength of the concrete are enhanced, a sticky and slippery film layer can be formed, the cementing and lubricating effects are achieved, and the workability of the concrete is improved;
2. by filling the antibacterial agent into the waste concrete particles, the pores in the waste concrete particles can be reduced, the strength and the impermeability of the waste concrete particles are increased, the antibacterial agent can be slowly released, the long-acting antibacterial effect is achieved, and the possibility that bacteria are bred and corroded in the use process of concrete is reduced, so that the impermeability and the strength are reduced.
Detailed Description
The present invention will be described in further detail with reference to examples.
The source information of the raw materials and components involved in the present invention is shown in table 1:
TABLE 1 specification and purchase information of raw materials
Preparation example
Preparation example 1
s1, crushing the concrete waste by using a crusher, and screening by using a screen to obtain waste concrete particles with 10-15mm continuous gradation;
s2, spreading 550 parts of waste concrete particles on the grid plate in parts by weight, showering with tap water, soaking for 5min, and draining until no water drops to obtain the recycled coarse aggregate.
Preparation example 2
The difference from preparation example 1 is that: in the s2 step, the waste concrete particles were 600 parts by weight.
Preparation example 3
The difference from preparation example 1 is that: in the s2 step, the waste concrete particles were 650 parts by weight.
Preparation example 4
The difference from preparation example 1 is that: in the step s2, adding 80 parts by weight of nano titanium oxide powder into 1000 parts by weight of deionized water, uniformly stirring by a stirrer, adding waste concrete particles, adjusting the pH to be neutral by 3% hydrochloric acid and 5% sodium carbonate, continuously stirring for 2 hours, filtering by a grating plate, and draining until no water drops to obtain the regenerated coarse aggregate.
The coarse aggregate prepared in the preparation examples is detected according to GB/T14685-2011 construction pebble and coarse aggregate, and the apparent density is more than 2500kg/m3Bulk density of more than 1500kg/m3The void ratio is more than 35 percent, and meets the standard of coarse aggregate for buildings.
Example (b):
the components and proportions in the examples are shown in table 2:
components and proportions in the examples of Table 2
The preparation method of each example is as follows:
example 1
s 1: preparing recycled coarse aggregate according to the method of preparation example 1 for later use;
s 2: weighing the high-efficiency water reducing agent of the aldehyde naphthalene sulfonate condensate of the alkaryl sulfonate for later use according to the mixture ratio in the table 2;
s 3: uniformly mixing the recycled coarse aggregate, the fine aggregate and the water-based stamping lubricant by a stirrer according to the mixture ratio of the table 2 to obtain an aggregate mixture;
s 4: according to the proportion shown in the table 2, hydroxypropyl methylcellulose is added into water to be completely dissolved, stirred uniformly by a stirrer, added with silica fume and uniformly mixed to obtain a filling solution;
s5, adding the cement into the filling solution, and uniformly stirring to obtain a gel mixture;
and s6, adding the gel mixture into the aggregate mixture, uniformly stirring, adding the defoaming agent, stirring for 5min, sequentially adding the water reducing agent and the air entraining agent, and stirring for 8min to obtain the recycled concrete.
Example 2
The difference from example 1 is that: in the s1 step, a recycled coarse aggregate was prepared according to the method of preparation example 2 for future use.
Example 3
The difference from example 1 is that: in the s1 step, a recycled coarse aggregate was prepared for use in accordance with the method of preparation example 3.
Examples 4 to 5
The difference from example 1 is that: in the s1 step, a recycled coarse aggregate was prepared for use in accordance with the method of preparation example 4.
Examples 6 to 7
The difference from example 1 is that: and step s6, adding the gel mixture into the aggregate mixture, uniformly stirring, then adding octadecyl trimethyl ammonium chloride, then adding the defoaming agent, stirring for 5min, then sequentially adding the water reducing agent and the air entraining agent, and stirring for 8min to obtain the recycled concrete.
Examples 8 to 9
The difference from example 1 is that: in the step s2, according to the mixture ratio of table 2, sequentially adding ethylene oxide, urea, sodium sulfate and calcium lignosulfonate into the high-efficiency water reducing agent solution of the aldehyde naphthalene sulfonate condensate of the alkane-aryl sulfonic acid, and then feeding the solution into a drum mixer to be mixed for 115min at normal temperature and normal pressure to obtain the water reducing agent.
Comparative example
The components and the proportions of the recycled concrete prepared in each proportion are shown in Table 3:
TABLE 3 composition and proportion of recycled concrete in each proportion
The preparation method of each proportion is as follows:
comparative example 1
The difference from the preparation method of example 1 is that: hydroxypropyl methylcellulose was not added in step s 4.
Comparative example 2
The difference from the preparation method of example 1 is that: no microsilica was added in step s 4.
Comparative example 3
The difference from the preparation method of example 1 is that: in step s6, no defoamer was added.
Comparative example 4
The difference from the preparation method of example 1 is that: in step s3, no air entraining agent is added.
Comparative example 5
The difference from the preparation method of example 1 is that: in step s6, no water-based stamping lubricant is added.
Comparative example 6
The difference from the preparation method of example 4 is that: in the s1 step, a recycled coarse aggregate was prepared according to the method of preparation example 1; and in the step s4, uniformly mixing the recycled coarse aggregate, 80 parts of antibacterial agent, fine aggregate and water-based stamping lubricant to obtain an aggregate mixture.
Performance testing
The performance test method of the recycled concrete prepared in the above examples and comparative examples is as follows:
1. slump: testing the slump of the concrete mixture when the concrete mixture is taken out of the machine according to GB/T50080-2016 standard of test method for the performance of common concrete mixtures;
2. strength: making a standard test block according to GB/T50081-2002 standard of common concrete mechanical property test method, and measuring the 28-day compressive strength of the standard test block;
3. water penetration resistance: testing the water seepage depth of the concrete standard test block according to a step-by-step pressurization method in GB/T50082-2009 'test method standard for long-term performance and durability of common concrete';
4. antibacterial property and antibacterial durability: preparing two batches of cube concrete test blocks with edge length of 20mm at normal temperature, curing for one month, and completely soaking the concrete test blocks into culture solution of thiobacillus (bacterial count is 10)6Soaking in the first batch for 1 month, soaking in the second batch for 3 months, taking out the soaked concrete test block, naturally drying in the air, respectively soaking in 1% phenolphthalein solution for 10s, taking out, standing for 30min, cutting the concrete test block along any one of the central lines, measuring the depth of reddening inside the concrete as the corrosion depth, and judging the antibacterial performance and antibacterial durability of the prepared concrete; wherein the culture solution of the thiobacillus comprises the following components in parts by weight: 2 parts of ammonium sulfate, 0.3 part of calcium chloride dihydrate, 0.01 part of ferric sulfate heptahydrate, 4 parts of potassium dihydrogen phosphate, 0.3 part of magnesium sulfate heptahydrate, 40 parts of sodium thiosulfate pentahydrate, 0.002 part of bromophenol blue and 1000 parts of distilled water.
The results of the performance tests on the recycled concrete prepared in the above examples are shown in table 4:
TABLE 4 results of performance test of recycled concrete obtained in each example
The results of the performance tests on the recycled concrete prepared according to the above respective proportions are shown in table 5:
TABLE 5 Performance test results of recycled concrete prepared according to each comparative example
From the above data, it can be seen that:
1. comparing example 1 with comparative example 1, it is known that hydroxypropyl methylcellulose can increase the machine-out slump of concrete and effectively improve the workability; as can be seen from examples 1 to 3, the addition amount of hydroxypropylmethylcellulose is in the range of 34 to 38 parts by weight, and the effect of promoting the workability is gradually increased.
2. In comparison with comparative examples 1-2 and example 1, the micro silicon powder and hydroxypropyl methyl cellulose act together to fill the pores of the recycled coarse material and improve the impermeability and strength of the concrete.
3. As can be seen from comparison of comparative example 3 with example 1, the defoaming agent can reduce large bubbles inside concrete, thereby improving the strength and impermeability of the concrete.
4. Compared with the example 1, the air entraining agent can introduce the bubbles with stable structure and smaller radius into the concrete, improve the workability by utilizing the ball effect of the small bubbles and increase the strength and the impermeability of the concrete.
5. As can be seen from comparison of comparative example 5 with example 1, the lubricant is effective in reducing friction between the reclaimed coarse and fine aggregates, thereby improving workability.
6. It can be seen from the combination of example 4 and comparative example 6 with example 1 that the antibacterial property of concrete can be improved by using the waste concrete particles to carry the antibacterial agent, thereby improving the long-term impermeability of concrete.
7. Compared with the embodiment 1, the octadecyl trimethyl ammonium chloride can increase the channels for the antibacterial agent to pass through in the concrete, thereby improving the antibacterial efficiency of the concrete.
8. Compared with the example 1, the examples 8 to 9 show that the alkylarylsulfonic acid and naphthalenesulfonic acid aldehyde condensate superplasticizer, ethylene oxide, urea, sodium sulfate and calcium lignosulfonate are used in combination, and compared with the alkylarylsulfonic acid and naphthalenesulfonic acid aldehyde condensate superplasticizer which is used alone, the strength of concrete is improved greatly, and a certain effect of enhancing impermeability can be achieved.
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 (10)
1. The recycled concrete is characterized by comprising the following components in parts by weight: 650 parts of regenerated coarse aggregate 550-containing material, 480 parts of fine aggregate 400-containing material, 420 parts of cement 350-containing material, 210 parts of water 175-containing material, 35-50 parts of silica fume, 3-5 parts of water reducing agent, 0.05-0.10 part of air entraining agent, 0.03-0.06 part of defoaming agent, 0.03-0.05 part of water-based stamping lubricant and 34-38 parts of hydroxypropyl methyl cellulose, wherein the particle size of the silica fume is less than 1 mu m.
2. The recycled concrete of claim 1, wherein the recycled coarse aggregate is waste concrete particles carrying an antibacterial agent, and the particle size of the waste concrete particles is 10-15mm in a continuous aggregate.
3. The recycled concrete of claim 2, wherein the antimicrobial agent is nano titanium oxide.
4. The recycled concrete of claim 3, wherein the composition further comprises 13-18 parts of octadecyl trimethyl ammonium chloride.
5. The recycled concrete of claim 1, wherein the water reducing agent comprises 16-18 parts of an alkyl aryl sulfonic acid aldehyde naphthalene sulfonate condensate high-efficiency water reducing agent, 45-55 parts of ethylene oxide, 8-12 parts of urea, 5-8 parts of sodium sulfate and 30-40 parts of calcium lignosulfonate.
6. The recycled concrete of claim 1, wherein the air entraining agent is sodium alkyl benzene sulfonate.
7. The recycled concrete of claim 1, wherein the defoamer is a polyoxyethylene polyoxypropylene pentaerythritol ether.
8. A method for the preparation of recycled concrete according to claim 1, characterized in that it comprises the following steps:
s1, crushing the concrete waste, and screening to obtain waste concrete particles;
s2, spreading the waste concrete particles on the grid plate, spraying and soaking for 5min by using tap water, and draining until no water drops to obtain a regenerated coarse aggregate;
s3, preparing a water reducing agent for later use;
s4, uniformly mixing the recycled coarse aggregate, the fine aggregate and the water-based stamping lubricant to obtain an aggregate mixture;
s5, adding hydroxypropyl methyl cellulose into water, completely dissolving, stirring uniformly, then adding silica fume, and mixing uniformly to obtain a filling solution;
s6, adding the cement into the filling solution, and uniformly stirring to obtain a gel mixture;
and s7, adding the gel mixture into the aggregate mixture, uniformly stirring, adding the defoaming agent, stirring for 5min, sequentially adding the water reducing agent and the air entraining agent, and stirring for 8min to obtain the recycled concrete.
9. The method for preparing recycled concrete according to claim 8, wherein said step s2 is: according to the weight portion, 80 portions of nano titanium oxide are dissolved in 1000 portions of deionized water, then waste concrete particles are added, the pH value is adjusted to be neutral, the mixture is stirred for 2 hours, and the mixture is filtered and drained until no water drops, so that the recycled coarse aggregate is obtained.
10. The method for preparing recycled concrete according to claim 8, wherein said step s3 is: and (3) sequentially adding ethylene oxide, urea, sodium sulfate and calcium lignosulfonate into the high-efficiency water reducing agent of the alkyl aryl sulfonic acid naphthalene sulfonic acid aldehyde condensate, then feeding the mixture into a drum mixer, and stirring the mixture for 115min at normal temperature and normal pressure to obtain the water reducing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010834941.0A CN112047679B (en) | 2020-08-19 | 2020-08-19 | Recycled concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010834941.0A CN112047679B (en) | 2020-08-19 | 2020-08-19 | Recycled concrete and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112047679A true CN112047679A (en) | 2020-12-08 |
| CN112047679B CN112047679B (en) | 2022-04-26 |
Family
ID=73599674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010834941.0A Active CN112047679B (en) | 2020-08-19 | 2020-08-19 | Recycled concrete and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112047679B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624709A (en) * | 2021-01-15 | 2021-04-09 | 福州大学 | Antibacterial cement concrete and preparation method thereof |
| CN113087471A (en) * | 2021-04-20 | 2021-07-09 | 上海石化安东混凝土有限公司 | Recycled concrete and preparation method thereof |
| CN113173750A (en) * | 2021-04-27 | 2021-07-27 | 西南大学 | Preparation method of antibacterial high-performance fiber concrete |
| CN115073079A (en) * | 2022-07-15 | 2022-09-20 | 联建建设工程有限公司 | Preparation method of expanded compact impervious concrete |
| CN115259782A (en) * | 2022-06-29 | 2022-11-01 | 济南圣华混凝土有限公司 | Anti-crack concrete and construction method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030574A (en) * | 1987-06-25 | 1989-01-25 | 清华大学 | High-efficient water reducer made of alkyl aryl sulfonate and aldehyde naphthalene sulfonate condensate |
| CN1191850A (en) * | 1997-02-24 | 1998-09-02 | 吴长荣 | Preparation of high-efficiency water-reducing agent |
| CN104310891A (en) * | 2014-10-15 | 2015-01-28 | 浙江大学宁波理工学院 | Ecological nanometer photocatalysis completely recycled concrete |
| CN108439833A (en) * | 2018-05-08 | 2018-08-24 | 江苏金海宁新型建材科技有限公司 | A kind of high-performance low-carbon concrete and preparation method thereof |
| CN108484207A (en) * | 2018-06-13 | 2018-09-04 | 合肥广民建材有限公司 | A kind of Novel pressure-resistant cracking resistance water-permeable brick |
| CN108726956A (en) * | 2018-08-08 | 2018-11-02 | 宝辰永宇（滁州）新材料科技有限公司 | A kind of modification regeneration concrete and preparation method thereof |
| CN109456003A (en) * | 2018-12-08 | 2019-03-12 | 曙光装配式建筑科技（浙江）有限公司 | A kind of impervious regeneration concrete and preparation method thereof |
| CN111056794A (en) * | 2019-12-17 | 2020-04-24 | 深圳市恒星建材有限公司 | Ecological nano photocatalytic recycled concrete and preparation method thereof |
-
2020
- 2020-08-19 CN CN202010834941.0A patent/CN112047679B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030574A (en) * | 1987-06-25 | 1989-01-25 | 清华大学 | High-efficient water reducer made of alkyl aryl sulfonate and aldehyde naphthalene sulfonate condensate |
| CN1191850A (en) * | 1997-02-24 | 1998-09-02 | 吴长荣 | Preparation of high-efficiency water-reducing agent |
| CN104310891A (en) * | 2014-10-15 | 2015-01-28 | 浙江大学宁波理工学院 | Ecological nanometer photocatalysis completely recycled concrete |
| CN108439833A (en) * | 2018-05-08 | 2018-08-24 | 江苏金海宁新型建材科技有限公司 | A kind of high-performance low-carbon concrete and preparation method thereof |
| CN108484207A (en) * | 2018-06-13 | 2018-09-04 | 合肥广民建材有限公司 | A kind of Novel pressure-resistant cracking resistance water-permeable brick |
| CN108726956A (en) * | 2018-08-08 | 2018-11-02 | 宝辰永宇（滁州）新材料科技有限公司 | A kind of modification regeneration concrete and preparation method thereof |
| CN109456003A (en) * | 2018-12-08 | 2019-03-12 | 曙光装配式建筑科技（浙江）有限公司 | A kind of impervious regeneration concrete and preparation method thereof |
| CN111056794A (en) * | 2019-12-17 | 2020-04-24 | 深圳市恒星建材有限公司 | Ecological nano photocatalytic recycled concrete and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 夏正兵: "《建筑材料 第2版》", 31 August 2016, 东南大学出版社 * |
| 马清浩等: "《水泥混凝土外加剂550问》", 30 November 2008, 中国建材工业出版社 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624709A (en) * | 2021-01-15 | 2021-04-09 | 福州大学 | Antibacterial cement concrete and preparation method thereof |
| CN113087471A (en) * | 2021-04-20 | 2021-07-09 | 上海石化安东混凝土有限公司 | Recycled concrete and preparation method thereof |
| CN113087471B (en) * | 2021-04-20 | 2022-05-20 | 上海石化安东混凝土有限公司 | Recycled concrete and preparation method thereof |
| CN113173750A (en) * | 2021-04-27 | 2021-07-27 | 西南大学 | Preparation method of antibacterial high-performance fiber concrete |
| CN115259782A (en) * | 2022-06-29 | 2022-11-01 | 济南圣华混凝土有限公司 | Anti-crack concrete and construction method thereof |
| CN115259782B (en) * | 2022-06-29 | 2023-03-17 | 济南圣华混凝土有限公司 | Anti-crack concrete and construction method thereof |
| CN115073079A (en) * | 2022-07-15 | 2022-09-20 | 联建建设工程有限公司 | Preparation method of expanded compact impervious concrete |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112047679B (en) | 2022-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112047679B (en) | Recycled concrete and preparation method thereof | |
| EP1831126B1 (en) | Concrete and mortar additive, process for the preparation thereof, and its use, as well as concrete or mortar containing it | |
| CN109293317A (en) | A kind of high intensity self-compacting concrete and preparation method thereof | |
| CN102584095B (en) | Admixture for vegetation-form ecological concrete and compounding method thereof | |
| US20220144700A1 (en) | High strength coral concrete and preparation method thereof | |
| CN110655346A (en) | Machine-made sand regulator and preparation method thereof | |
| CN101767960A (en) | Recycled concrete coarse aggregate modified processing method | |
| CN111533504A (en) | Ultrahigh-performance concrete formed by mixing machine-made sand and aeolian sand and preparation method thereof | |
| CN108328977B (en) | Concrete repairing material | |
| CN112679190B (en) | Reinforcing waterproof mortar for filling concrete bottom cavity | |
| CN107117856A (en) | Pure pulvis pervious concrete reinforcing agent and its application method with nanometer humidification | |
| CN108715528A (en) | A kind of permeable pavement brick and preparation method thereof | |
| CN102923997B (en) | Method for preparing high-strength semi-regenerative coarse aggregate concretes | |
| CN112456891B (en) | Pervious concrete material prepared from waste sintered bricks and application thereof | |
| CN107021698A (en) | A kind of grinding coagulation soil and preparation method thereof | |
| CN109650771A (en) | A kind of reducing and anti-cracking reinforcing agent, C50 machine-made sand concrete and preparation method | |
| CN112110696B (en) | Concrete for super-retarding secondary structure | |
| CN115180900B (en) | Ultrahigh-performance premixed pervious concrete and preparation method thereof | |
| CN115124298B (en) | High-strength recycled aggregate concrete prepared from waste stone powder and preparation method thereof | |
| CN109293294A (en) | A kind of side slope deep layer gutter enhancement eco-concrete | |
| CN102863175A (en) | Addition agent for recycled aggregate type ecological concrete | |
| CN113998939A (en) | Phosphogypsum-based super-retarding concrete and preparation method thereof | |
| CN107056119A (en) | A kind of anti-cracking agent for mortar and preparation method thereof | |
| CN113354327A (en) | Reinforcing agent for pervious concrete | |
| CN101412606B (en) | Concrete containing low-quality coarse aggregate and preparation thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |