CN115057674A - Preparation method of low-carbon type ultrahigh-performance concrete - Google Patents
Preparation method of low-carbon type ultrahigh-performance concrete Download PDFInfo
- Publication number
- CN115057674A CN115057674A CN202210585305.8A CN202210585305A CN115057674A CN 115057674 A CN115057674 A CN 115057674A CN 202210585305 A CN202210585305 A CN 202210585305A CN 115057674 A CN115057674 A CN 115057674A
- Authority
- CN
- China
- Prior art keywords
- stirring
- cement
- limestone powder
- water
- performance 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
- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 30
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000004568 cement Substances 0.000 claims abstract description 49
- 239000000843 powder Substances 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 235000019738 Limestone Nutrition 0.000 claims abstract description 36
- 239000006028 limestone Substances 0.000 claims abstract description 36
- 238000003756 stirring Methods 0.000 claims abstract description 34
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000000835 fiber Substances 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 239000004576 sand Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims abstract description 10
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 7
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 239000011268 mixed slurry Substances 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 12
- 239000006004 Quartz sand Substances 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 17
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 230000036571 hydration Effects 0.000 description 6
- 238000006703 hydration reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
-
- 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
-
- 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]
-
- 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
Abstract
The invention relates to a preparation method of low-carbon type ultrahigh-performance concrete, which is characterized in that the ultrahigh-performance concrete is prepared from cement, limestone powder, silica fume, steel fiber, sand, a water reducing agent and water according to the material ratio; stirring the silica fume and mixing water to prepare silica fume slurry before stirring; adding cement, limestone powder and sand into a stirring pot, slowly stirring and uniformly mixing, adding the previously mixed silica mortar together with water and a water reducing agent into the stirring pot, and stirring for at least three minutes; continuously stirring the slurry until the slurry is in a uniform state, adding the steel fibers, stirring for one minute, adding the rest of the steel fibers, and stirring for two minutes; pouring the mixed slurry into a test mold, vibrating, forming, and curing in a standard curing room after 24h of mold removal. The invention greatly reduces the consumption of cement, reduces the production cost of concrete and simultaneously reduces the carbon emission generated in the cement production process.
Description
Technical Field
The invention relates to a preparation method of low-carbon type ultrahigh-performance concrete.
Background
The ultra-high performance concrete is a cement-based material with excellent performance, and has excellent mechanical properties and durability. The concept of the ultra-high performance concrete is firstly proposed in 1994, and the basic principle and the method for preparing the ultra-high performance concrete are to improve the homogeneity, the stacking compactness, the microstructure and the toughness. Researchers mix ultrafine powder such as silica powder and fly ash in the ultra-high performance concrete, reduce the porosity by micro-filling effect and generated hydration products, and simultaneously greatly improve the tensile property of the concrete by the application of the steel fiber. The ultrahigh-performance concrete has great application potential, can be used for preparing high-strength engineering members, and can also be used as a repair material to maintain engineering in time. In the traditional ultra-high performance concrete mixing proportion, the content of cement in each concrete reaches 1200 kg, and the cement consumption reaches four times of that of common concrete. Meanwhile, more silica fume is doped into the ultra-high performance concrete, and the silica fume doping amount in each concrete reaches 250-350 kg, so that the production cost of the concrete is greatly improved.
The water cement ratio of the ultra-high performance concrete during molding is 0.14-0.20, and the water cement ratio required by the complete hydration of cement is 0.4, so the hydration degree of the cement in the ultra-high performance concrete is only about 30%, and a large amount of unhydrated cement clinker only plays a role in filling the concrete. In view of reducing cost and carbon dioxide emission, it is necessary to reduce the amount of cement to be blended and to improve the efficiency of use of cement. In the powder material of the ultrahigh performance concrete, cement particles having a large particle diameter account for a major part, and the stacked voids of the cement are filled with ultrafine powder particles (for example, silica fume). When the amount of the ultrafine powder is too large, the degree of compaction of the system is reduced, and therefore, the amount of the cement cannot be reduced significantly. The invention reduces the fineness of cement, and uses thinner cement to replace common cement, thereby improving the reactivity. In addition, the limestone powder with large mixing amount is used for replacing cement and mineral admixture, so that the water-cement ratio in the ultra-high performance concrete is improved, the carbon emission is reduced, and the utilization efficiency of the cement is improved.
Disclosure of Invention
The invention aims to provide a preparation method and application of low-carbon type ultrahigh-performance concrete for improving the hydration degree of cement and reducing excessive consumption of cement.
The invention provides a preparation method of low-carbon type ultrahigh-performance concrete, which is characterized in that the ultrahigh-performance concrete is prepared from cement, limestone powder, silica fume, steel fibers, sand, a water reducing agent and water, wherein the limestone powder adopts 100-mesh and 1000-mesh limestone powder, and the average particle size of the limestone powder is 13.8 mu m and 36.4 mu m respectively; wherein: 400 parts of cement, 640 parts of 100-mesh limestone powder, 115-mesh limestone powder, 130 parts of 1000-mesh limestone powder, 160 parts of water, 440 parts of quartz sand, 5.2-6.0 parts of a water reducing agent and 20 parts of steel fiber;
wherein: the cement is 42.5-grade superfine portland cement with the average particle size of 4.4 microns;
the preparation method of the ultra-high performance concrete comprises the following specific steps:
(1) preparing cement, limestone powder, silica fume, steel fiber, sand, a water reducing agent and water according to the material ratio;
(2) when the concrete is formed, because the silica fume particles are fine and easy to agglomerate, the silica fume and the mixing water are stirred to prepare silica mortar before stirring;
(3) adding cement, limestone powder and sand into a stirring pot, slowly stirring and uniformly mixing, adding the previously mixed silica mortar together with water and a water reducing agent into the stirring pot, and stirring for at least three minutes;
(4) continuously stirring the slurry until the slurry is in a uniform state, adding 50% of steel fibers, stirring for one minute, adding the rest of the steel fibers, and stirring for two minutes;
(5) pouring the mixed slurry into a container with a size of 40X 160 mm 3 In the mold testing, the mold is formed after vibration, and the mold is placed into a standard curing room for curing after 24 hours of mold removal.
In the present invention, the average particle size of the silica fume is 0.15. mu.m.
In the invention, the length of the steel fiber is 12mm, the diameter is 0.2mm, and the length-diameter ratio is 60.
In the invention, the sand is quartz sand.
In the invention, the water reducing agent is a polycarboxylic acid high-performance liquid water reducing agent, the solid content is 55%, and the water reducing rate is more than 30%.
In the present invention, the hydration degree refers to the percentage of the portion of the cement clinker in the cement that reacts to form hydration products in the total amount of the cement clinker.
The invention has the beneficial effects that:
firstly, the ultra-strong high-performance concrete prepared by the method uses a large amount of limestone powder, so that the utilization of wastes is realized. Limestone powder belongs to a byproduct in sandstone exploitation, and cannot be used as a mineral admixture for mass application in concrete due to the fact that limestone powder does not have high activity. In the invention, the concrete mixing proportion is designed by utilizing a close packing theory, the optimal proportion of limestone powder with different fineness is obtained, and at the moment, the limestone powder reaches the closest packing state and the existing gap is the smallest. Limestone powder serves as a framework of the powder material, and meanwhile, ultrafine cement with higher activity is used for filling the limestone powder, so that the compactness of the structure is guaranteed. The addition of the limestone powder is beneficial to improving the fluidity of the concrete, so that the concrete has better working performance.
Secondly, the consumption of cement is greatly reduced, and in the embodiment, only 25-35% of cement by mass is doped, so that the production cost of concrete is greatly reduced, and carbon emission generated in the cement production process is reduced. The superfine cement has high activity, so that the concrete still has good mechanical properties under low cement mixing amount. The super-strong high-performance concrete can still reach the breaking strength of 20MPa and the compressive strength of 107MPa under the condition of 75 percent of limestone powder mixing amount, and has good working performance.
Detailed Description
The invention is further illustrated by the following examples.
Example 1-example 3:
the preparation process of the low-carbon type ultrahigh-performance concrete comprises
Firstly, determining the concrete mixing proportion
Ultra-high performance concrete mixing proportion (kg/m 3)
| Serial number | Cement | 100 mesh limestone powder | 1000 mesh limestone powder | Silica fume | Quartz sand | Water reducing agent | Water (W) | Steel fiber |
| Example 1 | 275 | 634 | 158 | 33 | 440 | 5.4 | 118 | 20 |
| Example 2 | 330 | 590 | 148 | 33 | 440 | 5.6 | 124 | 20 |
| Example 3 | 370 | 558 | 140 | 33 | 440 | 5.9 | 128 | 20 |
In the embodiment, a skeleton is constructed by limestone powder with different fineness by utilizing a close packing theory in a mix proportion design process, wherein the mass ratio of 100-mesh limestone powder to 1000-mesh limestone powder is 4: 1. The cement accounts for 25%, 30% and 35% of the cementing material, and the rest is limestone powder and silica fume accounting for 3% of the cementing material. The mixing water is used in a water-cement ratio of 0.4.
② concrete forming
The method comprises the following steps: when the concrete is formed, because the silica fume particles are fine and easy to agglomerate, the silica fume and the mixing water are stirred to prepare silica mortar before stirring;
step two: adding cement, limestone powder and sand into a stirring pot, slowly stirring and uniformly mixing, adding the previously mixed silica mortar together with water and a water reducing agent into the stirring pot, and stirring for at least three minutes;
step three: continuously stirring the slurry until the slurry is in a uniform state, adding 50% of steel fibers, stirring for one minute, adding the rest of the steel fibers, and stirring for two minutes;
step four: pouring the mixed slurry into a 40 x 160 mm3 test mould, vibrating, forming, and curing in a standard curing room after 24h of mould removal.
The strength of the test pieces is tested at ages of 7d, 28d and 90d, and the results are as follows:
as can be seen from the above table, when the cement content is only 25%, the prepared ultra-high performance concrete still has the flexural strength of 20MPa and the compressive strength of 107 MPa.
Claims (5)
1. A preparation method of low-carbon type ultrahigh-performance concrete is characterized by comprising the following steps: the materials used by the ultra-high performance concrete are cement, limestone powder, silica fume, steel fiber, sand, a water reducing agent and water, wherein the limestone powder adopts 100-mesh and 1000-mesh limestone powder, and the average particle size of the particles is 13.8 mu m and 36.4 mu m respectively; wherein: 400 parts of cement, 640 parts of 100-mesh limestone powder, 115-mesh limestone powder, 130 parts of 1000-mesh limestone powder, 160 parts of water, 440 parts of quartz sand, 5.2-6.0 parts of a water reducing agent and 20 parts of steel fiber;
wherein: the cement is 42.5-grade superfine portland cement with the average particle size of 4.4 microns;
the preparation method of the ultra-high performance concrete comprises the following specific steps:
(1) preparing cement, limestone powder, silica fume, steel fiber, sand, a water reducing agent and water according to the material ratio;
(2) stirring the silica fume and mixing water to prepare silica fume slurry before stirring;
(3) adding cement, limestone powder and sand into a stirring pot, slowly stirring and uniformly mixing, adding the previously mixed silica mortar together with water and a water reducing agent into the stirring pot, and stirring for at least three minutes;
(4) continuously stirring the slurry until the slurry is in a uniform state, adding 50% of steel fibers, stirring for one minute, adding the rest of the steel fibers, and stirring for two minutes;
(5) pouring the mixed slurry into a container with a size of 40X 160 mm 3 And in the mold testing, molding after vibration, and putting the mold into a standard curing room for curing after 24 hours of mold removal.
2. The preparation method of the low-carbon type ultra-high performance concrete according to claim 1, characterized in that: the average particle size of the silica fume is 0.15 μm.
3. The preparation method of the low-carbon type ultra-high performance concrete according to claim 1, characterized in that: the length of the steel fiber is 12mm, the diameter is 0.2mm, and the length-diameter ratio is 60.
4. The preparation method of the low-carbon type ultra-high performance concrete according to claim 1, characterized in that: the sand is quartz sand.
5. The preparation method of the low-carbon type ultra-high performance concrete according to claim 1, characterized in that: the water reducing agent is a polycarboxylic acid high-performance liquid water reducing agent, the solid content is 55%, and the water reducing rate is more than 30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210585305.8A CN115057674A (en) | 2022-05-27 | 2022-05-27 | Preparation method of low-carbon type ultrahigh-performance concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210585305.8A CN115057674A (en) | 2022-05-27 | 2022-05-27 | Preparation method of low-carbon type ultrahigh-performance concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115057674A true CN115057674A (en) | 2022-09-16 |
Family
ID=83198173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210585305.8A Pending CN115057674A (en) | 2022-05-27 | 2022-05-27 | Preparation method of low-carbon type ultrahigh-performance concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115057674A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105622009A (en) * | 2015-12-23 | 2016-06-01 | 东南大学 | Silica fume-free ultra-high performance concrete matrix and preparation method thereof |
| CN113248214A (en) * | 2021-06-15 | 2021-08-13 | 广西路桥工程集团有限公司 | Machine-made sand ultrahigh-performance concrete with compressive strength of more than 180Mpa and preparation method thereof |
| CN113773018A (en) * | 2021-09-17 | 2021-12-10 | 中山市灵湾新材料科技有限公司 | Low-shrinkage high-crack-resistance ultrahigh-performance concrete and preparation method thereof |
| US20220112131A1 (en) * | 2019-12-30 | 2022-04-14 | Qingdao university of technology | Lightweight aggregate ultra-high performance concrete (uhpc) and preparation method thereof |
-
2022
- 2022-05-27 CN CN202210585305.8A patent/CN115057674A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105622009A (en) * | 2015-12-23 | 2016-06-01 | 东南大学 | Silica fume-free ultra-high performance concrete matrix and preparation method thereof |
| US20220112131A1 (en) * | 2019-12-30 | 2022-04-14 | Qingdao university of technology | Lightweight aggregate ultra-high performance concrete (uhpc) and preparation method thereof |
| CN113248214A (en) * | 2021-06-15 | 2021-08-13 | 广西路桥工程集团有限公司 | Machine-made sand ultrahigh-performance concrete with compressive strength of more than 180Mpa and preparation method thereof |
| CN113773018A (en) * | 2021-09-17 | 2021-12-10 | 中山市灵湾新材料科技有限公司 | Low-shrinkage high-crack-resistance ultrahigh-performance concrete and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102850011B (en) | Technological process for preparing active powder concrete by using iron tailing | |
| CN111499294B (en) | Ultrahigh-performance concrete dry powder and preparation method thereof | |
| CN111848026A (en) | Alkali-activated nano-reinforced early-strength type ultrahigh-performance concrete and preparation method thereof | |
| CN115819049B (en) | Cement-based grouting material for mounting wind power foundation tower barrel base and preparation method thereof | |
| CN107117909B (en) | Active powder concrete doped with fly ash and preparation method thereof | |
| CN111620624B (en) | Self-compacting concrete and preparation method thereof | |
| CN101781107A (en) | Non-steamed reactive powder concrete | |
| CN111470823A (en) | Composite cementing material system of ultra-high performance concrete and application method thereof | |
| CN109279861B (en) | Self-compacting composite concrete, preparation method thereof and concrete wall brick | |
| CN110922132A (en) | Light-weight ultrahigh-strength concrete and preparation method thereof | |
| CN111423180A (en) | High-fluidity environment-friendly ultra-high-performance concrete and preparation method thereof | |
| CN103508713A (en) | Basalt fiber-reinforced active powder concrete and preparation method thereof | |
| CN113816640B (en) | Tuff-based composite mineral admixture and preparation method thereof | |
| CN104386969A (en) | High-strength and high-durability lightweight aggregate concrete and preparation method thereof | |
| CN111732382A (en) | Compensation shrinkage type ultrahigh-performance concrete prepared from tailing sand and preparation method thereof | |
| CN109250980A (en) | A kind of steel slag concrete and preparation method thereof | |
| CN111792889A (en) | Natural tuff ultrahigh-performance concrete and preparation method thereof | |
| CN113292291A (en) | Low-cost low-shrinkage coarse aggregate UHPC suitable for cast-in-place and preparation process thereof | |
| CN116023098A (en) | Low-carbon high-durability concrete | |
| CN114956710A (en) | High-performance fly ash sprayed concrete for mudstone tunnel and preparation method thereof | |
| CN109293311A (en) | Ultra-high performance concrete slurry, ultra-high performance concrete and preparation method thereof | |
| CN113087465A (en) | Method for preparing green ultrahigh-performance concrete by using construction waste in full component manner | |
| CN115010455B (en) | High-performance full-solid waste concrete and preparation method thereof | |
| CN111362636A (en) | C60 carbon fiber concrete and preparation method thereof | |
| CN115057667B (en) | Self-compacting concrete and production process 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 | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20220916 |