CN108218357B - Glass fiber reinforced cement material prepared from tailing sand - Google Patents
Glass fiber reinforced cement material prepared from tailing sand Download PDFInfo
- Publication number
- CN108218357B CN108218357B CN201810024896.5A CN201810024896A CN108218357B CN 108218357 B CN108218357 B CN 108218357B CN 201810024896 A CN201810024896 A CN 201810024896A CN 108218357 B CN108218357 B CN 108218357B
- Authority
- CN
- China
- Prior art keywords
- parts
- glass fiber
- water
- fiber reinforced
- tailing sand
- 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.)
- Active
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
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/29—Frost-thaw resistance
-
- 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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a glass fiber reinforced cement material prepared from tailing sand, which is prepared from the following raw materials in parts by weight: 35-45 parts of cement, 10-35 parts of natural quartz sand, 5-30 parts of tailing sand, 10-20 parts of water, 0.2-2 parts of a water reducing agent, 2-5 parts of a water-soluble polymer solution and 2-4 parts of alkali-resistant glass fiber. The cement is quick-hardening sulphoaluminate cement; the fibers are alkali-resistant glass fiber untwisted roving; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water-soluble polymer solution is acrylate copolymer emulsion. The glass fiber reinforced cement material has the characteristics of high compressive strength, high bending ultimate strength, bending proportion ultimate strength, high impact strength and high freezing resistance.
Description
Technical Field
The invention relates to a cement-based composite material, in particular to a glass fiber reinforced cement material with high freezing resistance and high strength prepared by using tailing sand and a preparation method thereof, belonging to the technical field of building materials.
Background
The glass fiber reinforced cement is prepared with alkali-resisting glass fiber as reinforcing material and cement mortar as base materialThe main components of the fiber cement composite material are cement, sand, water, alkali-resistant glass fiber, additive and the like. Wherein the cement is sulphoaluminate cement and portland cement; the sand is high-quality natural quartz sand; the glass fiber is alkali-resistant glass fiber. The main properties of the glass fiber reinforced cement material researched in China at present are as follows: bending proportional ultimate strength of 7.0-8.0 MPa, bending ultimate strength of 15.0-20.0 MPa, and impact strength of 8kJ/m2The compression strength is about 30-50 MPa, and the frost resistance is generally no damage phenomena such as layer formation, peeling and the like after 25 times of freeze-thaw cycles.
Most of the sand for producing the glass fiber reinforced cement is quartz sand. The quartz sand is quartz particles formed by crushing and processing natural quartz stone, is a hard, wear-resistant and chemically stable silicate mineral, and has the main mineral component of SiO 2.
The tailing sand is the waste discharged after the ore is ground and useful components are selected by a dressing plant under specific economic and technical conditions. The tailings are huge in quantity, and are piled up into mountains for a long time, so that the tailings not only occupy land, river channels or farmlands, but also destroy environments and vegetation, and even have debris flow danger. The comprehensive utilization of the tailings is a long-term task.
The invention adopts the tailings to replace natural quartz sand, greatly improves the cohesiveness and impermeability of a cement interface through a certain process and a certain reinforcing and toughening technology and a polymer modification technology, prepares the glass fiber reinforced cement material, the replacement proportion reaches 20-60 percent, and the prepared glass fiber reinforced cement material has high strength and good durability. Changes waste into valuable, develops and utilizes the tailings as resources, and protects natural resources.
Disclosure of Invention
The invention aims to solve the technical problem of providing a glass fiber reinforced cement material prepared by using tailing sand and a preparation method thereof, wherein the tailing sand after processing is used for replacing natural quartz sand, and a certain preparation process, polymer modification and other technical methods are adopted to prepare the glass fiber reinforced cement material with high compressive strength, high impact strength, high bending limit strength and good freezing resistance, so that the technical bottleneck of poor mechanical property and durability in the preparation of the glass fiber reinforced cement material by using solid wastes is broken through. The performance index of the glass fiber reinforced cement material prepared by using the tailing sand is excellent and is superior to that of the glass fiber reinforced cement material on the market, and under the condition that the initial fluidity reaches 150-400 mm, the compressive strength of the prepared new material reaches more than 40MPa in 7 days, the impact strength reaches more than 21MPa, the bending proportion ultimate strength reaches more than 10MPa, and the bending strength ultimate strength reaches more than 20 MPa; the freeze-thaw resistance of the material is excellent, after 75 times of freeze-thaw cycles, the mass loss of the material is not more than 3%, the bending limit strength loss is not more than 10%, and the frost resistance index can not be reached by the glass fiber reinforced cement material in the current market.
In order to achieve the purpose, the invention adopts the following technical scheme:
a glass fiber reinforced cement material prepared from tailing sand is prepared by stirring and spraying the following components in parts by weight: 35-45 parts of cement, 10-35 parts of natural quartz sand, 5-30 parts of tailing sand, 10-20 parts of water, 0.2-2 parts of a water reducing agent, 2-5 parts of a water-soluble polymer solution and 2-4 parts of alkali-resistant glass fiber.
In the technical scheme, the cement is quick-hardening sulphoaluminate cement.
In the technical scheme, the natural quartz sand is a particle formed by crushing and processing natural quartz stone, and the particle size is 0.01-15 mm; the main mineral component is SiO2。
In the technical scheme, the tailing sand is a particulate matter formed by screening and washing solid waste after iron ore iron separation, and the particle size is 0.01-5 mm; the main mineral component of the mineral is SiO2The content of sludge is less than 3% by mass.
In the above technical solution, the water reducing agent includes, but is not limited to, a naphthalene water reducing agent, an aminosulfonic acid water reducing agent, a melamine water reducing agent, and a polycarboxylic acid high performance water reducing agent, and is preferably a polycarboxylic acid high performance water reducing agent.
In the above technical scheme, the water-soluble polymer solution is an acrylate copolymer emulsion.
In the technical scheme, the alkali-resistant glass fiber is alkali-resistant glass fiber roving; the diameter of the fiber is 8-48 μm, and the length of the fiber is 6-50 mm.
The invention also provides a preparation method of the glass fiber reinforced cement material prepared by using the tailing sand, which comprises the following steps:
(1) crushing natural quartz stone into particles with the particle size of 0.01-15 mm for later use; screening and washing solid waste after iron ore iron separation to prepare particles with the particle size of 0.01-5 mm and the mud content of less than 3% (by mass) for later use;
(2) adding 10-35 parts of quartz stone particles obtained in the step (1) and 5-30 parts of tailing sand into a stirrer, adding 35-45 parts of cement, 10-20 parts of water, 0.2-2 parts of a water reducing agent and 2-5 parts of a water-soluble polymer solution into the stirrer, stirring for 3-6 minutes, and keeping the fluidity of slurry to be 150-400 mm;
(3) adding 2-4 parts of alkali-resistant glass fiber into the slurry obtained in the step (2), and simultaneously spraying the slurry and the fiber by adopting a mechanical spraying process to obtain a glass fiber reinforced cement material prepared from tailing sand; the whole preparation process takes 6-9 minutes, and the obtained glass fiber reinforced cement material prepared by using the tailing sand is maintained in a standard curing room for 7 days and then is detected.
Compared with the prior art, the high-frost-resistance and high-strength glass fiber reinforced cement material prepared by using the tailing sand has the following beneficial effects:
1. the initial fluidity of the slurry is large and reaches 150-400 mm.
2. The glass fiber reinforced cement material prepared from the tailing sand has the advantages of compressive strength of more than 40MPa in 7 days, impact strength of more than 24MPa, bending strength limit of more than 20MPa, bending ratio limit of more than 10MPa and excellent performance.
3. The glass fiber reinforced cement material prepared from the tailing sand has excellent frost resistance, is an index which can not be reached by similar materials in the current market, and after 75 times of freeze-thaw cycles, the mass loss of the glass fiber reinforced cement material is not more than 3 percent, and the shock resistance and the freeze-thaw resistance of the glass fiber reinforced cement material are 3 times of those of common glass fiber reinforced cement materials.
The preparation process of the glass fiber reinforced cement material prepared by using the tailing sand is simple, the tailing generated in the mining process is used, the waste is turned into treasure, and the method is suitable for industrial centralized production.
Detailed Description
The following detailed description of the embodiments of the present invention is provided, but the present invention is not limited to the following descriptions:
example 1:
a glass fiber reinforced cement material prepared by using tailing sand comprises the following components in percentage by weight: the weight ratio of the quick hardening sulphoaluminate cement, the natural quartz sand, the tailing sand, the water reducing agent, the water-soluble polymer solution and the alkali-resistant glass fiber is 38.50, 33.88, 8.47, 13.34, 0.52, 3.23 and 2.06;
wherein the water reducing agent is a polycarboxylic acid high-performance water reducing agent; the water-soluble polymer solution is acrylate copolymer emulsion; the alkali-resistant glass fiber is alkali-resistant glass fiber roving with the fiber diameter of 20 mu m and the fiber length of 25 mm;
is prepared by the following method:
(1) crushing natural quartz stone into particles with the particle size of less than 4mm for later use; screening and washing solid waste after iron ore iron separation to prepare particles with the particle size of less than 1mm and the mud content of less than 3% (by mass) for later use;
(2) adding the quartz stone particles and the tailing sand particles obtained in the step (1) into a stirrer in proportion, adding cement, water, a water reducing agent and a water-soluble polymer solution into the stirrer, stirring for 3 minutes, and keeping the fluidity of slurry to 210 mm;
(3) adding alkali-resistant glass fibers into the slurry obtained in the step (2) in proportion, and simultaneously spraying the slurry and the fibers by adopting a mechanical spraying process to obtain a glass fiber reinforced cement material prepared by using tailing sand; the whole preparation process takes 7 minutes, and the obtained glass fiber reinforced cement material prepared by using the tailing sand is cured in a standard curing room 7After 7 days, the compressive strength is 40.4MPa and the impact strength is 25.3KJ/m2The bending strength limit is 20.1MPa, the bending proportion limit strength is 10.8MPa, and the strength loss is 1.5 percent after 75 times of freeze-thaw cycles.
Example 2:
a glass fiber reinforced cement material prepared by using tailing sand comprises the following components in percentage by weight: the weight ratio of the quick hardening sulphoaluminate cement, the natural quartz sand, the tailing sand, the water reducing agent, the water-soluble polymer solution and the alkali-resistant glass fiber is 38.58, 25.46, 16.98, 13.37, 0.52, 3.24 and 1.82;
wherein the water reducing agent is a polycarboxylic acid high-performance water reducing agent; the water-soluble polymer solution is acrylate copolymer emulsion; the alkali-resistant glass fiber is alkali-resistant glass fiber roving with the fiber diameter of 34 mu m and the fiber length of 30 mm;
is prepared by the following method:
(1) crushing natural quartz stone into particles with the particle size of 5mm for later use; screening and washing solid waste after iron ore iron separation to form particles with the particle size of less than 2mm and the mud content of less than 3% (by mass) for later use;
(2) adding the quartz stone particles and the tailing sand particles obtained in the step (1) into a stirrer in proportion, adding cement, water, a water reducing agent and a water-soluble polymer solution into the stirrer, stirring for 5 minutes, and keeping the fluidity of slurry to 280 mm;
(3) adding alkali-resistant glass fibers into the slurry obtained in the step (2) in proportion, and simultaneously spraying the slurry and the fibers by adopting a mechanical spraying process to obtain a glass fiber reinforced cement material prepared by using tailing sand; the whole process takes 8 minutes, the obtained glass fiber reinforced cement material prepared by using the tailing sand is detected after being cured for 7 days in a standard curing room, the compressive strength is 42.2MPa and the impact strength is 25.0KJ/m after 7 days2The bending strength limit is 20.9MPa, the bending proportion limit strength is 10.7MPa, and the strength loss is 1.8 percent after 75 times of freeze-thaw cycles.
Example 3:
a glass fiber reinforced cement material prepared by using tailing sand comprises the following components in percentage by weight: the weight ratio of the quick hardening sulphoaluminate cement, the natural quartz sand, the tailing sand, the water reducing agent, the water-soluble polymer solution and the alkali-resistant glass fiber is 38.50, 16.94, 25.41, 13.34, 0.52, 3.23 and 2.02;
wherein the water reducing agent is a polycarboxylic acid high-performance water reducing agent; the water-soluble polymer solution is acrylate copolymer emulsion; the alkali-resistant glass fiber is alkali-resistant glass fiber roving with the fiber diameter of 40 mu m and the fiber length of 45 mm;
is prepared by the following method:
(1) crushing natural quartz stone into particles with the particle size of 3mm for later use; screening and washing solid waste after iron ore iron separation to obtain particles with the particle size of less than 3mm and the mud content of less than 3% (by mass) for later use;
(2) adding the quartz stone particles and the tailing sand particles obtained in the step (1) into a stirrer in proportion, adding cement, water, a water reducing agent and a water-soluble polymer solution into the stirrer, stirring for 6 minutes, and keeping the fluidity of slurry to be 360 mm;
(3) adding alkali-resistant glass fibers into the slurry obtained in the step (2) in proportion, and simultaneously spraying the slurry and the fibers by adopting a mechanical spraying process to obtain a glass fiber reinforced cement material prepared by using tailing sand; the whole process takes 9 minutes, the obtained glass fiber reinforced cement material prepared by using the tailing sand is detected after being cured for 7 days in a standard curing room, the compressive strength is 43.5MPa after 7 days, and the impact strength is 24.8KJ/m2The bending strength limit is 20.2MPa, the bending proportion limit strength is 11.2MPa, and the strength loss after 75 times of freeze-thaw cycles is 2.2 percent.
The above examples are only for illustrating the technical concept and features of the present invention, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (2)
1. The glass fiber reinforced cement material prepared from the tailing sand is characterized by being prepared by stirring and spraying the following components in parts by weight: 35-45 parts of cement, 10-35 parts of natural quartz sand, 5-30 parts of tailing sand, 10-20 parts of water, 0.2-2 parts of a water reducing agent, 2-5 parts of a water-soluble polymer solution and 2-4 parts of alkali-resistant glass fiber;
the cement is quick-hardening sulphoaluminate cement;
the natural quartz sand is a particle formed by crushing natural quartz stone, the particle size is 0.01-5 mm, and the main mineral component is SiO2；
The tailing sand is a particulate matter formed by screening and washing solid waste after iron ore iron separation, and the particle size is 0.01-3 mm; the main mineral component is SiO2The mud content is less than 3% by mass;
the water reducing agent is a polycarboxylic acid high-performance water reducing agent;
the water-soluble polymer solution is acrylate copolymer emulsion.
The alkali-resistant glass fiber is alkali-resistant glass fiber roving; the diameter of the fiber is 8-48 μm, and the length of the fiber is 6-50 mm.
2. A method for preparing a glass fiber reinforced cement material according to claim 1, comprising the steps of:
(1) crushing natural quartz stone into particles with the particle size of 0.01-5 mm for later use; screening and washing solid waste after iron ore iron separation to obtain particles with the particle size of 0.01-3 mm and the mud content of less than 3% by mass for later use;
(2) adding 10-35 parts of quartz stone particles obtained in the step (1) and 5-30 parts of tailing sand into a stirrer, adding 35-45 parts of cement, 10-20 parts of water, 0.2-2 parts of a water reducing agent and 2-5 parts of a water-soluble polymer solution into the stirrer, stirring for 3-6 minutes, and keeping the fluidity of slurry to be 150-400 mm;
(3) adding 2-4 parts of alkali-resistant glass fiber into the slurry obtained in the step (2), and simultaneously spraying the slurry and the fiber by adopting a mechanical spraying process to obtain a glass fiber reinforced cement material prepared from tailing sand; the whole preparation process takes 6-9 minutes, and the obtained glass fiber reinforced cement material prepared by using the tailing sand is maintained in a standard curing room for 7 days and then is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810024896.5A CN108218357B (en) | 2018-01-11 | 2018-01-11 | Glass fiber reinforced cement material prepared from tailing sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810024896.5A CN108218357B (en) | 2018-01-11 | 2018-01-11 | Glass fiber reinforced cement material prepared from tailing sand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108218357A CN108218357A (en) | 2018-06-29 |
| CN108218357B true CN108218357B (en) | 2021-05-04 |
Family
ID=62641726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810024896.5A Active CN108218357B (en) | 2018-01-11 | 2018-01-11 | Glass fiber reinforced cement material prepared from tailing sand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108218357B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110683811A (en) * | 2019-10-28 | 2020-01-14 | 江苏金石源新材料有限公司 | Reinforced cement material prepared from solid-waste mixture and preparation method |
| CN111606627A (en) * | 2020-06-01 | 2020-09-01 | 中国建材检验认证集团北京天誉有限公司 | Low-water-absorption GRC material prepared from white portland cement |
| CN111620633A (en) * | 2020-06-01 | 2020-09-04 | 中国建材检验认证集团北京天誉有限公司 | White belite sulphoaluminate cement GRC material and preparation method thereof |
| CN112939548A (en) * | 2021-04-09 | 2021-06-11 | 广东欣粤电力器材有限公司 | Manufacturing method of high-strength mortar concrete |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7905956B2 (en) * | 2006-02-15 | 2011-03-15 | Nichiha Corporation | Fiber reinforced cement composition and products and manufacturing process |
| CN105884281A (en) * | 2016-04-19 | 2016-08-24 | 东南大学 | High-ductility fiber cement impervious wall prepared from tailing sand and preparation method of high-ductility fiber cement impervious wall |
| CN105924048A (en) * | 2016-05-05 | 2016-09-07 | 哈尔滨工程大学 | Glass fiber reinforcement polymer modification cement for curtain wall board and preparing method |
-
2018
- 2018-01-11 CN CN201810024896.5A patent/CN108218357B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7905956B2 (en) * | 2006-02-15 | 2011-03-15 | Nichiha Corporation | Fiber reinforced cement composition and products and manufacturing process |
| CN105884281A (en) * | 2016-04-19 | 2016-08-24 | 东南大学 | High-ductility fiber cement impervious wall prepared from tailing sand and preparation method of high-ductility fiber cement impervious wall |
| CN105924048A (en) * | 2016-05-05 | 2016-09-07 | 哈尔滨工程大学 | Glass fiber reinforcement polymer modification cement for curtain wall board and preparing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108218357A (en) | 2018-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108069669B (en) | Glass fiber reinforced cement material prepared from waste concrete | |
| CN108164230B (en) | Glass fiber reinforced cement material prepared from solid-waste mixture | |
| CN107235684B (en) | Recycled fine aggregate ultrahigh-performance concrete and use method thereof | |
| CN108793876B (en) | Pervious concrete with waste concrete as aggregate, preparation method and application thereof | |
| CN103319129B (en) | Ecological nanoparticle reinforced cement based composite material and preparation method thereof | |
| CN108218357B (en) | Glass fiber reinforced cement material prepared from tailing sand | |
| CN108017345A (en) | A kind of ultrahigh-performance cement-based patching material and preparation method thereof | |
| CN110981351A (en) | Hybrid fiber ultra-high performance concrete UHPC electric pole and manufacturing method thereof | |
| CN113816696A (en) | Recycled fine aggregate internal curing-based ultrahigh-performance concrete and preparation method thereof | |
| CN106927761A (en) | The high performance concrete of admixture iron tailings sand, silicon ash and basalt fibre | |
| CN109369121A (en) | A kind of manufacture craft of high-elastic modulus fibre seif-citing rate regeneration concrete | |
| CN107488018A (en) | A kind of sulphoaluminate cement base superelevation ductility concrete and preparation method thereof | |
| CN109626901B (en) | Preparation method of high-toughness cement concrete | |
| CN112079594A (en) | Geological polymer high-strength mortar for concrete structure repair and preparation method thereof | |
| WO2024120065A1 (en) | Mine tailing-derived self-forming material and use thereof | |
| CN109626920A (en) | A kind of concrete road surface material for quickly repairing and preparation method with high intensity and endurance quality | |
| CN110002810B (en) | Concrete and preparation process thereof | |
| CN110759682A (en) | Environment-friendly high-toughness fiber reinforced cement-based composite material and preparation method thereof | |
| CN112960954B (en) | High-strength low-drying-shrinkage all-coal gangue aggregate cement mortar and preparation method thereof | |
| CN113636802A (en) | Ultrahigh-performance concrete and preparation method thereof | |
| CN109867502B (en) | Impervious iron tailing concrete and preparation method thereof | |
| CN114956746B (en) | 3D printed antimony tailing solid waste fast-hardening concrete | |
| CN117623712A (en) | High-strength environment-friendly concrete and production method thereof | |
| CN102285780B (en) | Ultrahigh-performance cement-based composite material for banking and financial equipment and preparation method thereof | |
| CN115677300A (en) | High-strength environment-friendly concrete 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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 100113 No. 1, Guanghua Road, Industrial Development Zone, Tongzhou District, Beijing Patentee after: Guojian Testing Holding Group Beijing Co.,Ltd. Address before: No. 1 Guanghua Road, Tongzhou Industrial Development Zone, Tongzhou District, Beijing, 100113 Patentee before: CHINA BUILDING MATERIAL TEST & CERTIFICATION GROUP BEIJING TIAN YU CO.,LTD. |
|
| CP03 | Change of name, title or address |