CN111302731A - Novel pervious concrete well pipe and preparation method thereof - Google Patents
Novel pervious concrete well pipe and preparation method thereof Download PDFInfo
- Publication number
- CN111302731A CN111302731A CN202010119828.4A CN202010119828A CN111302731A CN 111302731 A CN111302731 A CN 111302731A CN 202010119828 A CN202010119828 A CN 202010119828A CN 111302731 A CN111302731 A CN 111302731A
- Authority
- CN
- China
- Prior art keywords
- well pipe
- novel
- recycled
- parts
- pervious concrete
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
-
- 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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
-
- 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
- C04B2111/56—Compositions suited for fabrication of pipes, e.g. by centrifugal casting, or for coating concrete pipes
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a novel pervious concrete well pipe and a preparation method thereof, and relates to the technical field of pervious concrete. The novel permeable concrete well pipe is made of recycled brick aggregate and recycled sand head in construction waste, so that the cost of raw materials of the well pipe is low, and the pollution of the construction waste to the environment is reduced; compared with the traditional steel well pipe, the novel permeable concrete well pipe has better water permeability, mud blocking effect and excellent performance of difficult hole plugging, and has high strength and good stability; the preparation method of the novel pervious concrete well pipe is simple, easy to operate and low in production equipment cost, and no wastewater or waste gas is discharged in the production process, so that the novel pervious concrete well pipe meets the requirements of environmental protection.
Description
Technical Field
The invention relates to the technical field of pervious concrete, in particular to a novel pervious concrete well pipe and a preparation method thereof.
Background
According to the principle that safety is important, ecology is preferential, environment is the basis, local conditions are appropriate and overall coordination is achieved, the national temporary regulations for sponge city special planning and preparation require that technical measure systems such as seepage, stagnation, storage, purification, use and discharge are constructed, source emission reduction, process control and system management are implemented, the influence of city development and construction on ecological environment is reduced to the maximum extent, and seepage is mainly supported by various water permeable and drainage systems.
The well point dewatering is usually used for foundation pits with higher underground water level, and the method can discharge the moisture in the foundation soil to solidify the foundation soil, thereby improving the strength of the foundation, preventing the foundation soil from shifting and settling, enabling the foundation to be in a dry construction environment and ensuring the quality of foundation construction. In a complex foundation construction environment, different comprehensive designs and layouts can be performed according to different foundations and construction environments by using different well points. In the well-point dewatering construction process, a steel pipe with holes is usually adopted as a well pipe, the well pipe is continuously sunk when the well pipe is hoisted and placed, the well pipe is firmly connected, the direction is vertical, and after the well pipe is placed, the well pipe is 0.5m higher than an orifice. The traditional steel pipe consumes a large amount of steel, and has complex manufacturing process and higher manufacturing cost.
For a long time, as the sandstone aggregate has wide sources and low price without paying attention, along with the increase of the consumption of concrete, the resource exhaustion and the environmental damage caused by mining the sandstone aggregate become the focus of attention of people. Meanwhile, a large amount of concrete buildings are dismantled due to the fact that the concrete buildings reach the service life or the municipal needs, and a large amount of building waste can be generated. If the waste building bricks and tiles and the recycled sand heads can be used as recycled sand aggregate to replace natural sand aggregate and applied to new fields, the cost can be reduced, mineral resources can be saved, the contradiction between supply and demand of the sand aggregate can be relieved, the pollution of building waste to urban environment can be reduced, and the economic and social benefits are obvious.
The recycled brick aggregate is concrete aggregate obtained by crushing, grading and cleaning waste building red bricks and mutually matching the waste building red bricks according to the requirements of national standards on aggregate particle grading. The recycled brick aggregates are recycled from construction waste, and are crushed, sorted and leached to obtain recycled brick particles with the particle size of 5-10 mm; the reclaimed sand is a sand head with the particle size of 5-10mm treated in the preparation process of the dry powder mortar. The basic properties of the recycled brick aggregate and the recycled sand are systematically researched to prepare the recycled sand aggregate, the recycled sand aggregate is compared with the natural sand aggregate, the characteristics of the recycled sand aggregate are fully mastered, and the recycled sand aggregate is used for preparing the concrete material with high water permeability, so that remarkable economic benefit and environmental benefit are brought.
At present, no report of manufacturing a pervious concrete well pipe by mixing building waste sand and building brick aggregate exists.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a novel pervious concrete well pipe and a preparation method thereof, compared with the traditional steel well pipe, the novel pervious concrete well pipe has better water permeability, mud blocking effect and excellent performance of difficult hole plugging, and has high strength and good stability; the preparation method is simple, easy to operate and low in production equipment cost, and no wastewater or waste gas is discharged in the production process, so that the preparation method meets the requirements of environmental protection.
In order to achieve the purpose, the technical scheme of the invention is to design a novel pervious concrete well pipe, which comprises the following raw materials in parts by weight: 1700 parts of recycled brick aggregate and/or recycled sand head, 300-500 parts of ordinary portland cement, 5-10 parts of curing agent and 90-150 parts of water, wherein the particle size of the recycled brick aggregate is 5-15 mm, and the particle size of the recycled sand head is 5-15 mm.
The preferable technical scheme is that the curing agent consists of a water reducing agent, a reinforcing agent and redispersible rubber powder, and the weight ratio of the water reducing agent to the reinforcing agent is 2: 2: 1.
further preferably, the water reducing agent is an ether polycarboxylic acid type water reducing agent, and the reinforcing agent is a sulfate type reinforcing agent.
Still more preferably, the reinforcing agent is one of sodium sulfate and potassium sulfate.
The preparation method of the novel pervious concrete well pipe comprises the following steps:
s1: classifying and collecting the construction waste, screening brick aggregates in the construction waste, crushing the brick aggregates, and screening the crushed brick aggregates through screens with the apertures of 5mm and 15mm to obtain regenerated brick aggregates with the particle sizes of 5-15 mm;
s2: screening the waste sand heads left by the sand for the premixed mortar through a screen with the aperture of 5mm and 15mm to obtain regenerated sand heads with the particle size of 5-15 mm;
s3: mixing the recycled brick aggregate prepared in the step S1, the recycled sand head prepared in the step S2, ordinary portland cement, a curing agent and water according to a certain weight part ratio to obtain concrete mortar;
s4: processing the concrete mortar prepared in the step S3 into a well pipe parison by adopting a vertical suspension roll method forming process;
s5: and (3) curing the well pipe parison strip mold for 1 day, then removing the mold, watering and curing for 7 days, and naturally curing for 28 days to obtain the novel permeable concrete well pipe.
The invention has the advantages and beneficial effects that:
1. the novel permeable concrete well pipe is made of recycled brick aggregate and recycled sand head in construction waste, so that the cost of raw materials of the well pipe is low, and the pollution of the construction waste to the environment is reduced.
2. The novel permeable concrete well pipe has the characteristics of high strength, good stability and high permeability.
3. Compared with the traditional steel well pipe, the novel permeable concrete well pipe has better water permeability, mud blocking effect and excellent performance of difficult hole plugging.
4. The preparation method of the novel pervious concrete well pipe is simple, easy to operate and low in production equipment cost, and no wastewater or waste gas is discharged in the production process, so that the novel pervious concrete well pipe meets the requirements of environmental protection.
Detailed Description
The following further describes embodiments of the present invention with reference to examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
A novel pervious concrete well pipe comprises the following raw materials in parts by weight: the mortar comprises 1000 parts of recycled brick aggregate, 700 parts of recycled sand head, 350 parts of 42.5 ordinary portland cement, 5 parts of curing agent and 100 parts of water, wherein the particle size of the recycled brick aggregate is 5-15 mm, and the particle size of the recycled sand head is 5-15 mm. The water reducing agent is an ether polycarboxylic acid water reducing agent, and the reinforcing agent is sodium sulfate.
The preparation method of the novel pervious concrete well pipe comprises the following steps;
s1: classifying and collecting the construction waste, screening brick aggregates in the construction waste, crushing the brick aggregates, and screening the crushed brick aggregates through screens with the apertures of 5mm and 15mm to obtain regenerated brick aggregates with the particle sizes of 5-15 mm;
s2: screening the waste sand heads left by the sand for the premixed mortar through a screen with the aperture of 5mm and 15mm to obtain regenerated sand heads with the particle size of 5-15 mm;
s3: mixing and stirring the recycled brick aggregate prepared in the step S1, the recycled sand head prepared in the step S2, ordinary portland cement, a curing agent and water according to a certain weight part ratio for 3min to obtain concrete mortar;
s4: processing the concrete mortar prepared in the step S3 into a well pipe parison by adopting a vertical suspension roll method forming process;
s5: and (3) curing the well pipe parison strip mold for 1 day, then removing the mold, watering and curing for 7 days, and naturally curing for 28 days to obtain the novel permeable concrete well pipe.
Example 2
A novel pervious concrete well pipe comprises the following raw materials in parts by weight: 1700 parts of recycled brick aggregate, 450 parts of 42.5 parts of ordinary portland cement, 5 parts of curing agent and 100 parts of water, wherein the particle size of the recycled brick aggregate is 5-15 mm, and the particle size of the recycled sand head is 5-15 mm. The water reducing agent is an ether polycarboxylic acid water reducing agent, and the reinforcing agent is potassium sulfate.
The preparation method is the same as example 1.
Example 3
A novel pervious concrete well pipe comprises the following raw materials in parts by weight: 1700 parts of recycled sand head, 350 parts of 42.5 ordinary portland cement, 5 parts of curing agent and 100 parts of water, wherein the particle size of the recycled brick aggregate is 5-15 mm, and the particle size of the recycled sand head is 5-15 mm. The water reducing agent is an ether polycarboxylic acid water reducing agent, and the reinforcing agent is potassium sulfate.
The preparation method is the same as example 1.
Example 4
A novel pervious concrete well pipe comprises the following raw materials in parts by weight: the mortar comprises 100 parts of recycled brick aggregate, 1600 parts of recycled sand head, 450 parts of 42.5 common portland cement, 10 parts of curing agent and 100 parts of water, wherein the particle size of the recycled brick aggregate is 5-15 mm, and the particle size of the recycled sand head is 5-15 mm. The water reducing agent is an ether polycarboxylic acid water reducing agent, and the reinforcing agent is sodium sulfate.
The preparation method is the same as example 1.
Example 5
A novel pervious concrete well pipe comprises the following raw materials in parts by weight: the mortar comprises 700 parts of recycled brick aggregate, 1000 parts of recycled sand head, 450 parts of 42.5 common portland cement, 10 parts of curing agent and 100 parts of water, wherein the particle size of the recycled brick aggregate is 5-15 mm, and the particle size of the recycled sand head is 5-15 mm. The water reducing agent is an ether polycarboxylic acid water reducing agent, and the reinforcing agent is potassium sulfate.
The preparation method is the same as example 1.
Example 6
A novel pervious concrete well pipe comprises the following raw materials in parts by weight: 850 parts of recycled brick aggregate, 850 parts of recycled sand head, 500 parts of 42.5 ordinary portland cement, 10 parts of curing agent and 150 parts of water, wherein the particle size of the recycled brick aggregate is 5-15 mm, and the particle size of the recycled sand head is 5-15 mm. The water reducing agent is an ether polycarboxylic acid water reducing agent, and the reinforcing agent is sodium sulfate.
The preparation method is the same as example 1.
The performance of the novel permeable concrete well pipes prepared in examples 1 to 6 was tested according to the standard of GB/T11836-2009 "concrete and reinforced concrete drainpipes", and the test results are shown in Table 1.
Table 1 results of performance test of the novel pervious concrete well pipes in examples 1 to 6
Experiments show that: embodiments 1 to 6 show that the size deviation, external pressure load and water permeability coefficient of the novel permeable concrete well pipe prepared by the method meet the requirements of the GB/T11836-2009 Standard of concrete and reinforced concrete Drain pipes, and the purpose of the invention is achieved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. The novel pervious concrete well pipe is characterized by comprising the following raw materials in parts by weight: 1700 parts of recycled brick aggregate and/or recycled sand head, 300-500 parts of ordinary portland cement, 5-10 parts of curing agent and 90-150 parts of water, wherein the particle size of the recycled brick aggregate is 5-15 mm, and the particle size of the recycled sand head is 5-15 mm.
2. A novel pervious concrete well pipe as claimed in claim 1, wherein said curing agent is composed of a water reducing agent, a reinforcing agent and redispersible rubber powder in a weight ratio of 2: 2: 1.
3. the novel pervious concrete well pipe of claim 2, wherein said water reducing agent is an ether polycarboxylic acid type water reducing agent and said reinforcing agent is a sulfate type reinforcing agent.
4. A novel pervious concrete well tube as claimed in claim 3, wherein said reinforcing agent is one of sodium sulfate or potassium sulfate.
5. The method for preparing a novel pervious concrete well pipe as claimed in any one of claims 1 to 4, characterized by comprising the following steps:
s1: classifying and collecting the construction waste, screening brick aggregates in the construction waste, crushing the brick aggregates, and screening the crushed brick aggregates through screens with the apertures of 5mm and 15mm to obtain regenerated brick aggregates with the particle sizes of 5-15 mm;
s2: screening the waste sand heads left by the sand for the premixed mortar through a screen with the aperture of 5mm and 15mm to obtain regenerated sand heads with the particle size of 5-15 mm;
s3: mixing the recycled brick aggregate prepared in the step S1, the recycled sand head prepared in the step S2, ordinary portland cement, a curing agent and water according to a certain weight part ratio to obtain concrete mortar;
s4: processing the concrete mortar prepared in the step S3 into a well pipe parison by adopting a vertical suspension roll method forming process;
s5: and (3) curing the well pipe parison strip mold for 1 day, then removing the mold, watering and curing for 7 days, and naturally curing for 28 days to obtain the novel permeable concrete well pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010119828.4A CN111302731A (en) | 2020-02-26 | 2020-02-26 | Novel pervious concrete well pipe and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010119828.4A CN111302731A (en) | 2020-02-26 | 2020-02-26 | Novel pervious concrete well pipe and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111302731A true CN111302731A (en) | 2020-06-19 |
Family
ID=71154987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010119828.4A Pending CN111302731A (en) | 2020-02-26 | 2020-02-26 | Novel pervious concrete well pipe and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111302731A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116553870A (en) * | 2023-05-04 | 2023-08-08 | 江苏晨马建筑科技有限公司 | Environment-friendly concrete formula for prefabricated rainwater and sewage well and preparation method of environment-friendly concrete formula |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150016465A (en) * | 2013-08-02 | 2015-02-12 | 한국레미콘공업협동조합연합회 | Permeable concrete using recycled aggregate and porous concrete pavement using the same method |
| CN108558336A (en) * | 2018-01-12 | 2018-09-21 | 广东省建筑科学研究院集团股份有限公司 | A kind of plant growth pervious concrete of high-performance |
| CN109577353A (en) * | 2018-11-07 | 2019-04-05 | 江苏兴厦建设工程集团有限公司 | A kind of prefabricated regenerated aggregate concrete downcast well pipe and its construction method |
| CN110105009A (en) * | 2018-02-01 | 2019-08-09 | 广东清大同科环保技术有限公司 | A kind of permeable drainpipe |
-
2020
- 2020-02-26 CN CN202010119828.4A patent/CN111302731A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150016465A (en) * | 2013-08-02 | 2015-02-12 | 한국레미콘공업협동조합연합회 | Permeable concrete using recycled aggregate and porous concrete pavement using the same method |
| CN108558336A (en) * | 2018-01-12 | 2018-09-21 | 广东省建筑科学研究院集团股份有限公司 | A kind of plant growth pervious concrete of high-performance |
| CN110105009A (en) * | 2018-02-01 | 2019-08-09 | 广东清大同科环保技术有限公司 | A kind of permeable drainpipe |
| CN109577353A (en) * | 2018-11-07 | 2019-04-05 | 江苏兴厦建设工程集团有限公司 | A kind of prefabricated regenerated aggregate concrete downcast well pipe and its construction method |
Non-Patent Citations (1)
| Title |
|---|
| 水利部农村水利司 主编: "《机井技术手册》", 31 December 1995, 中国水利水电出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116553870A (en) * | 2023-05-04 | 2023-08-08 | 江苏晨马建筑科技有限公司 | Environment-friendly concrete formula for prefabricated rainwater and sewage well and preparation method of environment-friendly concrete formula |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103086667B (en) | Design method for mixing proportion of C20-grade high-performance recycled concrete | |
| CN106830777A (en) | Regeneration fill concrete and its application prepared by consumer waste incineration residue | |
| CN101857397A (en) | Method for preparing dry-mixed mortar from construction waste fine aggregate | |
| CN105776994A (en) | Self-compacting concrete prepared from concrete mixing station waste slurry | |
| CN104529333A (en) | Waste sintered brick recycled C30 concrete and preparation method thereof | |
| CN109400084B (en) | High-solid waste alkali-activated titanium slag extraction stabilized soil and preparation method thereof | |
| CN101143774A (en) | Environmental protection energy-saving concrete brick | |
| CN107235679A (en) | A kind of graphene enhancing water-permeable brick and preparation method thereof | |
| CN112142420A (en) | Multi-solid-waste large-mixing-amount baking-free water permeable brick and preparation method thereof | |
| CN104310923A (en) | Cement-free construction waste product and preparation method thereof | |
| CN104556905A (en) | Waste sintered brick recycled C25 concrete and preparation method thereof | |
| CN104860612A (en) | C25 green high-performance concrete prepared from all recycled coarse aggregate | |
| CN114105580A (en) | Method for preparing reactive powder concrete by utilizing bulk coal mine industrial solid wastes | |
| CN111574178B (en) | Preparation method of baking-free brick from residual soil and residual mud | |
| CN112608079A (en) | Method for recycling waste concrete | |
| CN115594446A (en) | Preparation method of green concrete based on sludge and waste concrete | |
| CN101857403A (en) | Permeable concrete and preparation method thereof | |
| CN110015901A (en) | The preparation method of self-cleaning coal gangue sintering water-permeable brick | |
| CN107117894A (en) | Permeable pavement brick containing building refuse brick tiling fine aggregate and preparation method thereof | |
| CN103771782A (en) | Porous concrete prepared from waste concrete aggregate and preparation method thereof | |
| CN111302731A (en) | Novel pervious concrete well pipe and preparation method thereof | |
| CN103496933B (en) | Preparation method of high-ferrosilicon tailing autoclaved brick | |
| CN113493333A (en) | Slurry-wrapped reinforced permeable recycled concrete and preparation method thereof | |
| CN108793896A (en) | A kind of pervious concrete and preparation method thereof | |
| CN111825362A (en) | Modification method for reducing water absorption of recycled coarse aggregate |
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 |
Application publication date: 20200619 |
|
| RJ01 | Rejection of invention patent application after publication |