CN112194433A - Construction waste recycled concrete - Google Patents
Construction waste recycled concrete Download PDFInfo
- Publication number
- CN112194433A CN112194433A CN202011083570.3A CN202011083570A CN112194433A CN 112194433 A CN112194433 A CN 112194433A CN 202011083570 A CN202011083570 A CN 202011083570A CN 112194433 A CN112194433 A CN 112194433A
- Authority
- CN
- China
- Prior art keywords
- aggregate
- waste
- concrete
- cement
- construction waste
- 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.)
- Pending
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
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides construction waste recycled concrete which is prepared from cement, natural coarse aggregate, waste brick aggregate and water in a weight ratio of 1 (1.20-1.50) to (0.80-1.20) to (0.40-1.50), wherein the weight ratio of the waste brick aggregate to the natural coarse aggregate is 0.67-0.75. The concrete prepared by the method has higher compressive strength.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to construction waste recycled concrete and a preparation method thereof.
Background
With the steady development of national economy and the acceleration of urbanization process in China, the quantity of building wastes generated by dismantling a large number of old buildings is increasing day by day, and the large quantity of building wastes are transported to the outsides or the periphery of cities for landfill or open-air stockpiling, thus not only wasting land and resources, but also polluting the environment. It is estimated that cities in China generate about 70 million tons of garbage annually, and the amount of garbage is continuously increasing, wherein the amount of construction garbage is about 33 million tons, and the total amount of garbage accounts for about 50 percent of the total amount of the urban garbage. Most of the demolished buildings are brick-concrete structure buildings, and the construction waste bricks account for a considerable proportion of the construction waste generated by demolishing the buildings. How to realize recycling of the construction waste bricks is widely researched.
CN105622014A discloses a multi-strength recycled brick aggregate fiber concrete and a preparation method thereof, wherein the multi-strength recycled brick aggregate fiber concrete is prepared from cement, fine aggregate, natural coarse aggregate, recycled brick coarse aggregate, polyolefin fiber, steel fiber and water according to the weight ratio of 1: 0.780 to 1.309: 0-1.830: 0.390 to 1.568: 0-0.019: 0-0.161: 0.33 to 0.48.
CN108911620A discloses a concrete containing recycled baked brick aggregate C40 and a preparation method thereof. The concrete containing the recycled baked brick aggregate C40 is prepared from cement, recycled baked brick coarse aggregate, natural coarse aggregate, fine aggregate and water according to the mass ratio of 1: 0.84-1.04: 0.35-0.45: 0.65-0.80: 030-0.37, and the water-cement ratio is 0.30-0.37; the preparation technology not only improves the strength of the recycled concrete and obviously improves the workability, the fluidity, the cohesiveness and other working performances, but also has the advantages of simple preparation method, high efficiency, environmental protection and energy conservation.
CN108911623A discloses a polypropylene fiber recycled brick concrete coarse aggregate concrete and a preparation method thereof, which is mainly prepared from the following raw materials: the concrete is prepared from water, cement, fine aggregate, recycled brick coarse aggregate, recycled concrete coarse aggregate and polypropylene fiber, wherein the mass ratio of the water, the cement, the fine aggregate, the recycled brick coarse aggregate, the recycled concrete coarse aggregate and the polypropylene fiber is 1: 2.54: 4.49: 3.07: 3.40: 0-1.8: 0.01; the specific preparation method comprises the steps of mixing the raw materials and adding the water reducing agent.
CN102815964A discloses a construction waste recycling process, which comprises the following steps: collecting waste concrete, waste mortar and waste brick slag; crushing and screening: crushing and screening the collected waste concrete, waste mortar and waste brick slag to obtain a regenerated coarse aggregate and a regenerated fine aggregate; preparing foam concrete: preparing cement slurry: uniformly stirring cement, water, the recycled coarse aggregate and the recycled fine aggregate to obtain cement slurry; foam diluent addition: and adding the foam diluent formed by uniformly mixing the foaming agent and water into the cement slurry and uniformly stirring to obtain the foam concrete.
"research on construction waste recycled foam concrete", Wangchenfu et al, construction technology, 2018, which uses cement as main cementing material, construction waste recycled aggregate micropowder and white waste foamed plastic as raw material. The experiment researches the influence of 4 factors of the foam plastic mixing amount, the floating bead mixing amount, the fly ash mixing amount and the micro powder mixing amount on the physical and mechanical properties of the foam concrete respectively. The research result shows that: the change of each mixing amount can lead the strength of the foam concrete to be obviously changed, and the proper mixing proportion of the construction waste regenerated foam concrete is provided by taking the compressive strength as a reference.
However, in the prior art, when the aggregate is made of the building waste bricks, the compressive strength of the prepared concrete is often not high enough to meet the requirements of some specific applications. Therefore, there is a need for a concrete having high compressive strength using aggregate made of construction waste bricks and a method for preparing the same.
Disclosure of Invention
In order to solve the above problems, the present inventors have conducted systematic studies and numerous experiments to provide a method for preparing a waste brick aggregate. Compared with the common waste brick aggregate, the aggregate prepared by the method has higher compressive strength.
In one aspect of the invention, the construction waste recycled concrete is prepared from cement, natural coarse aggregate, waste brick aggregate and water according to a weight ratio of 1 (1.20-1.50) to (0.80-1.20) to (0.40-1.50), wherein the weight ratio of the waste brick aggregate to the natural coarse aggregate is preferably 0.67-0.75.
Preferably, the natural coarse aggregate comprises sand.
Preferably, the sand comprises river sand.
Particularly preferably, the natural coarse aggregate has a particle size mass distribution of: 10 to 20 weight percent of the particle size of 5 to 10mm, 30 to 60 weight percent of the particle size of 10 to 15mm, and 20 to 30 weight percent of the particle size of 15 to 20 mm.
The inventor of the invention researches and finds that by adopting the specially selected continuous graded coarse aggregate, the mixture has good workability, segregation is not easy to generate, cement can be saved, and the concrete has good workability. Compared with the use of single-grade natural coarse aggregate, the cement can be saved by 5-20%. The segregation, especially the dynamic segregation situation, is obviously improved.
Preferably, the cement is portland cement.
Preferably, the cement is P.O 42.5.5R cement.
In a preferred embodiment of the present invention, the waste brick aggregate is derived from waste bricks in construction waste.
Preferably, the particle size of the waste brick aggregate is 5-10 mm.
In another aspect of the present invention, there is also provided a method for preparing the construction waste recycled concrete, comprising the steps of: (1) adding cement, natural coarse aggregate and waste brick aggregate into a stirring device according to the weight ratio, and uniformly mixing; and (2) adding water into the stirring device according to the weight ratio, and uniformly mixing.
Preferably, the mixing device is a concrete vibration mixer.
Particularly preferably, in the case of the present invention, the waste brick aggregate is prepared by a method comprising crushing waste bricks and sieving waste brick particles having a particle size of 5 to 10 mm.
Preferably, the screened waste brick particles are dried.
Preferably, the drying temperature is 105-120 ℃.
Preferably, wherein the drying time is 1.0-3.0 hours.
Preferably, the dried waste brick particles are then immersed in an ethanol solution of polyvinylpyrrolidone.
In a preferred embodiment of the invention, stirring is optionally carried out during the impregnation, the impregnation time being from 30min to 2 hours.
More preferably, the rotational speed of the stirring does not exceed 60 rpm.
Preferably, the impregnated waste brick particles are taken out and dried.
Preferably, the slurry is applied to the surface of the impregnated aggregate.
Preferably, the slurry is a cement paste. More preferably, the slurry further comprises fly ash.
In another aspect of the present invention, there is provided a waste brick aggregate prepared according to the above method.
Researches show that crystals of the waste brick fine aggregate are in an amorphous state, have an active foundation, and can reduce capillary pores, reduce pore water, reduce capillary force, effectively reduce micro-cracks of concrete and slow down early-stage drying shrinkage of a test block when used as concrete aggregate. Al in fine aggregate of waste brick2O3And SiO2Has high content and high activity, can effectively participate in the hydration of the cementing material, and the component is mixed with lime or cementAfter being mixed and mixed with water, the calcium hydroxide and the like can react chemically to generate a series of hydration products such as hydrated calcium silicate, hydrated calcium aluminate and the like, and the products can harden in the air or water and generate strength, thereby reducing Ca (OH) in a hydration system2Content, and quickens the hydration process.
However, the recycled aggregate of the waste brick has low strength and strong water absorption, which all limit the application range of the aggregate of the waste brick. If the strength of the waste brick aggregate can be enhanced to some extent by coating the surface of the waste brick aggregate directly with a reinforcing material, for example, cement paste, in use, particularly after setting, the cement paste layer is separated and peeled from the waste brick aggregate, resulting in a significant decrease in the strength thereof. Research further finds that one of the main reasons for causing the cement mortar layer to be stripped from the waste brick aggregate is that the waste brick aggregate has strong water absorbability, and when the cement mortar wraps the waste brick aggregate, the waste brick aggregate absorbs water in the cement mortar too fast, so that the cement mortar is not sufficiently solidified, and segregation occurs. Therefore, in the present invention, polyvinylpyrrolidone is used to block the capillary pores in the waste bricks to prevent this phenomenon. In addition, the polyvinylpyrrolidone modifies the surface of the waste brick aggregate, which is beneficial to the combination with mortar, and an adsorptive protective film can be formed on the surface of the waste brick aggregate particles to block Cl-And the like to corrode metal parts in the concrete.
Preferably, the concentration of polyvinylpyrrolidone in the ethanol solution is 0.5-5.0 wt%.
Preferably, the ethanol can be recovered for reuse. The recovery may be carried out by means conventional in the art, such as heating and condensation or volatilization and condensation.
Preferably, when the cement paste is used, the cement paste has a water-to-gel ratio of 1.0 to 1.5.
Due to the use of polyvinylpyrrolidone, a cement paste with a high water content can be used. The fluidity of the cement paste has obvious influence on the surface coating effect of the waste brick aggregate. When the water-to-glue ratio is adopted, a significantly improved pulp wrapping effect can be obtained compared to a lower water-to-glue ratio.
The inventors have also found that the degree of wetting of the slurry can also be very well controlled due to the use of polyvinylpyrrolidone.
The fly ash particles are mostly glass beads, play a role in lubricating in concrete mixtures, can reduce the internal friction, enable the concrete mixtures doped with fly ash to have better fluidity than standard concrete, are convenient for construction, and have the function of water reduction, and the fine particles in the fly ash can be uniformly distributed in cement paste to fill pores and capillary holes, thereby improving the pore structure of the concrete and increasing the compactness of the concrete.
Therefore, the inventor effectively combines the concrete aggregate containing the waste brick aggregate and the fly ash to play the synergistic promotion effect of the concrete aggregate and the fly ash, thereby realizing the advantage complementation.
Preferably, when fly ash is also included in the slurry, the weight ratio of cement to fly ash is 10:1 to 5: 1.
Preferably, the impregnated waste brick aggregate is placed in a wire mesh basket, placed in prepared cement paste, shaken and vibrated for 3-10min and taken out.
Preferably, curing is carried out at room temperature for 3-7 days after taking out. The crush strength was tested according to GB/T14685-2011.
The crushing index of the recycled aggregate of the waste bricks modified by the method is obviously superior to that of unreinforced aggregate, and the requirements of various application scenes can be met.
Detailed description of the preferred embodiments
In order that the invention may be more clearly understood, reference will now be made in detail to the following examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Taking waste common house building bricks, crushing the building waste bricks by using a jaw crusher, screening waste brick particles with the particle size of 5-10mm, drying the particles at the temperature of 110 ℃ for 1.2 hours, then soaking the dried waste brick particles into an ethanol solution of polyvinylpyrrolidone (the concentration of polyvinylpyrrolidone is 1.5 wt%), stirring at the speed of 20rpm for 1.5 hours, then taking out the soaked waste brick particles, airing, placing the soaked waste brick aggregates into a wire mesh hanging basket, placing the wire mesh hanging basket into prepared cement paste (the water-cement ratio of the cement paste is 1.3), shaking and vibrating for 3min, taking out, and curing for 1d at room temperature for later use. Preparing materials according to the weight ratio of cement to natural coarse aggregate to waste brick aggregate to water of 1:1.25:0.9:0.80, adding the cement to the natural coarse aggregate to the waste brick aggregate in a concrete vibration stirrer, mixing the materials uniformly for 10s in a dry mode, adding the water in the concrete vibration stirrer, stirring the materials for 40s, and mixing the materials uniformly. Preparing the obtained concrete into 10 test blocks, standing for 24h in an environment with the temperature of 25 ℃, finally transferring to a standard concrete curing room for curing for 28d, and then taking out the test blocks for a compression test according to the method specified in GB/T50081-2002. The detection proves that the average value of the compressive strength is 43.6MPa, and the relative average deviation is less than 2 percent. According to the detection result, the prepared concrete containing the waste brick aggregate meets the standard requirement of the concrete.
Comparative example 1
Example 1 was repeated except that no polyvinylpyrrolidone was used for the pretreatment of the waste brick aggregates and the crushed waste brick aggregates were directly wrapped with cement paste. The compressive strength was measured to be 36.41 MPa.
As can be seen from the above examples and comparative examples, the method of the present application enables the compressive strength of the concrete test piece to be improved significantly.
This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to make and use the invention. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims. All citations referred to herein are incorporated herein by reference to the extent that no inconsistency is made.
Claims (10)
1. A construction waste recycled concrete is prepared from cement, natural coarse aggregate, waste brick aggregate and water according to the weight ratio of 1 (1.20-1.50) to (0.80-1.20) to (0.40-1.50), wherein the weight ratio of the waste brick aggregate to the natural coarse aggregate is 0.67-0.75.
2. The construction waste recycled concrete of claim 1, wherein the natural coarse aggregate comprises sand.
3. The construction waste recycled concrete of claim 1, wherein said sand comprises river sand.
4. The construction waste recycled concrete according to claim 2 or 3, wherein the natural coarse aggregate has a particle size mass distribution of: 10 to 20 weight percent of the particle size of 5 to 10mm, 30 to 60 weight percent of the particle size of 10 to 15mm, and 20 to 30 weight percent of the particle size of 15 to 20 mm.
5. The construction waste recycled concrete of any of the preceding claims, wherein the cement is portland cement.
6. The construction waste recycled concrete of claim 5, wherein said cement is P.O42.5R cement.
7. The construction waste recycled concrete of any of the preceding claims, wherein the waste brick aggregate is from waste bricks in construction waste.
8. The construction waste recycled concrete of any of the preceding claims, wherein the particle size of the waste brick aggregate is 5-10 mm.
9. A method of preparing construction waste recycled concrete according to any one of the preceding claims, comprising the steps of:
(1) adding cement, natural coarse aggregate and waste brick aggregate into a stirring device according to the weight ratio, and uniformly mixing;
(2) adding water into a stirring device according to the weight ratio, and uniformly mixing.
10. The method of claim 9, wherein the mixing device is a concrete vibratory mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011083570.3A CN112194433A (en) | 2020-10-12 | 2020-10-12 | Construction waste recycled concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011083570.3A CN112194433A (en) | 2020-10-12 | 2020-10-12 | Construction waste recycled concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112194433A true CN112194433A (en) | 2021-01-08 |
Family
ID=74013463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011083570.3A Pending CN112194433A (en) | 2020-10-12 | 2020-10-12 | Construction waste recycled concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112194433A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113402230A (en) * | 2021-07-14 | 2021-09-17 | 郑州大学 | Broken brick waste glass aggregate concrete for expanded pile and preparation method thereof |
| CN114394799A (en) * | 2022-01-19 | 2022-04-26 | 安阳师范学院 | Composite reinforced fully-recycled brick aggregate concrete and optimization method and preparation method thereof |
| CN115180898A (en) * | 2022-07-15 | 2022-10-14 | 山东大学 | Ecological nano copper oxide recycled concrete, preparation method and application |
| CN115403317A (en) * | 2022-09-29 | 2022-11-29 | 南京大学建筑规划设计研究院有限公司 | Cement-based pressed wall material mainly made of waste brick residues and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102701663A (en) * | 2012-01-13 | 2012-10-03 | 深圳市伟沦建材有限公司 | Preparation method of recycled aggregate urban pavement bricks |
| JP5597467B2 (en) * | 2010-07-23 | 2014-10-01 | 東京電力株式会社 | Manufacturing method of recycled concrete |
| CN108911620A (en) * | 2018-06-15 | 2018-11-30 | 湖南大学 | Aggregate C40 concrete of brick containing recycled sinter and preparation method thereof |
| CN111217549A (en) * | 2020-02-10 | 2020-06-02 | 连云港久和混凝土有限公司 | Recycled concrete, preparation method and application thereof |
| CN111732384A (en) * | 2020-06-22 | 2020-10-02 | 福建鸿生建材发展有限公司 | Preparation method of high polymer recycled concrete |
-
2020
- 2020-10-12 CN CN202011083570.3A patent/CN112194433A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5597467B2 (en) * | 2010-07-23 | 2014-10-01 | 東京電力株式会社 | Manufacturing method of recycled concrete |
| CN102701663A (en) * | 2012-01-13 | 2012-10-03 | 深圳市伟沦建材有限公司 | Preparation method of recycled aggregate urban pavement bricks |
| CN108911620A (en) * | 2018-06-15 | 2018-11-30 | 湖南大学 | Aggregate C40 concrete of brick containing recycled sinter and preparation method thereof |
| CN111217549A (en) * | 2020-02-10 | 2020-06-02 | 连云港久和混凝土有限公司 | Recycled concrete, preparation method and application thereof |
| CN111732384A (en) * | 2020-06-22 | 2020-10-02 | 福建鸿生建材发展有限公司 | Preparation method of high polymer recycled concrete |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113402230A (en) * | 2021-07-14 | 2021-09-17 | 郑州大学 | Broken brick waste glass aggregate concrete for expanded pile and preparation method thereof |
| CN114394799A (en) * | 2022-01-19 | 2022-04-26 | 安阳师范学院 | Composite reinforced fully-recycled brick aggregate concrete and optimization method and preparation method thereof |
| CN115180898A (en) * | 2022-07-15 | 2022-10-14 | 山东大学 | Ecological nano copper oxide recycled concrete, preparation method and application |
| CN115180898B (en) * | 2022-07-15 | 2023-01-31 | 山东大学 | Ecological nano copper oxide recycled concrete, preparation method and application |
| CN115403317A (en) * | 2022-09-29 | 2022-11-29 | 南京大学建筑规划设计研究院有限公司 | Cement-based pressed wall material mainly made of waste brick residues and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112194433A (en) | Construction waste recycled concrete | |
| CN113929390B (en) | Environment-friendly green concrete and preparation method thereof | |
| Redden et al. | Microstructure, strength, and moisture stability of alkali activated glass powder-based binders | |
| CN106477929A (en) | A kind of intensifying regenerating aggregate processing method and intensifying regenerating aggregate concrete | |
| CN101265069A (en) | High-strength water-resistant plastering gypsum and producing method thereof | |
| CN111792902B (en) | High-strength water-resistant phosphogypsum composite cementing material and preparation method thereof | |
| CN111718160A (en) | Alkali-activated regenerated micro-powder solidified dehydrated sludge/slurry and preparation method thereof | |
| CN107879681B (en) | Concrete slurry, alkali-activated light rubber recycled concrete and preparation method thereof | |
| CN107777981A (en) | A kind of regeneration concrete and preparation method thereof | |
| CN110845194A (en) | Pervious concrete prepared from brick slag recycled aggregate and preparation method thereof | |
| CN112110705A (en) | Self-repairing semi-rigid base material for recycling construction waste | |
| CN108751865A (en) | Body refuse soil regeneration baking-free brick and preparation method thereof more than a kind of | |
| CN107500649A (en) | Unburned dregs brick and preparation method thereof and its application | |
| CN115340329A (en) | Recycled fine aggregate-magnesium oxide base expanding agent ultrahigh-performance concrete and preparation method thereof | |
| CN112159178B (en) | Concrete containing waste brick powder and fly ash | |
| CN111943545B (en) | Artificial sand and preparation method thereof | |
| Jing et al. | Experimental study on iron ore tailings sand and municipal solid waste incineration fly ash used in semi-rigid base of asphalt pavement | |
| CN109138355A (en) | The environmental protection construction method on hydrophobic cement ground | |
| CN112174613A (en) | Concrete containing waste brick powder | |
| CN115073090B (en) | Anti-shrinkage construction waste stable road base material and application thereof | |
| CN114751664B (en) | Waste incineration fly ash geopolymer and preparation method thereof | |
| CN115124317B (en) | Composite activated regenerated micro-powder concrete based on slurry wrapping process and preparation method thereof | |
| Sun et al. | Study on preparation of inorganic binder stabilized material with large dosage of phosphogypsum | |
| CN112194398A (en) | Preparation method of waste brick aggregate | |
| CN116119980A (en) | Cementing material of water supply plant sludge composite geopolymer and preparation method 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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210108 |