CN112047694A - RPC cover plate for tunnel bridge and preparation method thereof - Google Patents
RPC cover plate for tunnel bridge and preparation method thereof Download PDFInfo
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- CN112047694A CN112047694A CN202010962462.7A CN202010962462A CN112047694A CN 112047694 A CN112047694 A CN 112047694A CN 202010962462 A CN202010962462 A CN 202010962462A CN 112047694 A CN112047694 A CN 112047694A
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- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
-
- 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]
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to an RPC cover plate for a tunnel bridge, which is prepared from the following raw materials in parts by weight: 100-200 parts of cement, 300-600 parts of quartz sand, 5-20 parts of composite elastomer particles, 20-40 parts of steel fibers, 50-70 parts of mineral admixture, 1-10 parts of water reducing agent and 30-50 parts of water. Compared with the prior art, the toughness of the RPC cover plate can be effectively improved by using the composite elastomer particles, and the prepared RPC cover plate has high ductility, high strength, good dimensional stability and long service life.
Description
Technical Field
The invention belongs to the technical field of concrete materials, and relates to an RPC cover plate for a tunnel bridge and a preparation method thereof.
Background
RPC (reactive powder concrete) is a cement-based material which is developed by adopting conventional cement and other materials in the middle of 90 s after high-strength and high-performance concrete, has ultrahigh strength, high durability, high toughness and good volume stability, and is high-performance concrete compounded by a DSP (digital signal processor) material and a fiber reinforced material. The RPC material can prolong the service life of the structure, greatly reduce the maintenance cost and reduce the comprehensive cost of engineering construction and use. Therefore, the RPC material is widely applied to house construction, bridge engineering, military facilities and the like at present, and has a wide application prospect.
The RPC material is used as high-technology concrete, has qualitative leap compared with common concrete and the existing high-performance concrete in performance, and is superior to steel in economical efficiency and environmental protection. The RPC cover plate can effectively reduce the dead weight of the structure, and the thickness of the interface transition area can be reduced due to the characteristics of the RPC cover plate. RPC is very compact and has extremely low porosity, which can not only prevent radioactive substance from leaking from the inside, but also resist the corrosion of external aggressive media, thus improving the uniformity, strength and durability of the system as a whole.
However, in practical applications, although the RPC cover plate has high strength and high stability, the RPC cover plate has a relatively large brittleness, which is quite disadvantageous to resist impact load and bear vibration, i.e. when the RPC cover plate is impacted, the RPC cover plate is easily damaged, which is also a main cause of the common rupture of the RPC cover plate at present. In addition, silica fume is mostly adopted in the RPC base stock as a cementing material to improve the compactness of the RPC to the maximum extent, but the silica fume is expensive and has higher cost.
Disclosure of Invention
An object of the present invention is to provide an RPC cover plate for a tunnel bridge, which has high ductility, high strength, high stability and low cost, so as to overcome the above-mentioned drawbacks of the prior art.
The invention also aims to provide a preparation method of the RPC cover plate for the tunnel bridge.
The purpose of the invention can be realized by the following technical scheme:
according to one aspect of the invention, the RPC cover plate for the tunnel bridge is prepared from the following raw materials in parts by weight: 100-200 parts of cement, 300-600 parts of quartz sand, 5-20 parts of composite elastomer particles, 20-40 parts of steel fibers, 50-70 parts of mineral admixture, 1-10 parts of water reducing agent and 30-50 parts of water.
As a preferred embodiment, the cement is formed by mixing 52.5-grade ordinary portland cement and 42.5R-grade fly ash portland cement according to a mass ratio of 5: 1.
As a preferred embodiment, the quartz sand has a particle size of 2mm or less and SiO2The content is more than or equal to 98 percent, and the mud content is less than or equal to 0.5 percent.
As a preferred embodiment, the composite elastomer particles are prepared from the following raw materials in parts by weight: 50-80 parts of regenerated rubber particles, 20-40 parts of SEBS thermoplastic elastomer, 2-10 parts of maleic anhydride grafted ethylene propylene diene monomer, 0.1-1 part of organic peroxide, 610-15 parts of nylon, 1-3 parts of zinc palmitate soap, 1-2 parts of polyethylene wax and 0.1-0.8 part of passivator.
As a preferred embodiment, the grafting ratio of the maleic anhydride grafted ethylene propylene diene monomer rubber is 1.2-1.8%.
As a preferred embodiment, the organic peroxide may be selected from dibenzoyl peroxide.
As a preferred embodiment, the phlegmatising agent is selected from salicylidene-N-salicyloyl hydrazine or bis [ ethyl-3- (3, 5-di-tert-butyl-4-hydroxyphenyl) ]2, 2-oxamide.
As a preferred embodiment, the method for preparing the composite elastomer particles comprises: adding the regenerated rubber particles, the SEBS thermoplastic elastomer and the maleic anhydride grafted ethylene propylene diene monomer into a stirrer according to parts by weight, uniformly stirring and mixing, then adding the organic peroxide, the zinc palmitate soap and the passivator according to parts by weight, uniformly stirring and mixing, then adding the nylon 6 and the polyethylene wax according to parts by weight, uniformly stirring and mixing, introducing into a double-screw extruder, after melt extrusion, cooling, dehumidifying, granulating and drying to obtain the composite elastomer particles.
As a preferred embodiment, the composite elastomer particles have a particle size of 1mm or less.
As a preferred embodiment, the twin-screw extruder has the following processing technology: the temperature of the first zone is 190-.
As a preferred embodiment, the steel fiber has a diameter of 0.4 to 0.6mm, a length of 20 to 25mm, and a tensile strength of 1000MPa or more.
As a preferred embodiment, the mineral admixture is S105 grade slag powder or S115 grade slag powder, and the specific surface area is more than or equal to 700m2Kg, density 2.9g/cm3。
As a preferred embodiment, the water reducing agent is selected from one or more of a lignosulfonate water reducing agent, a naphthalene water reducing agent, a melamine water reducing agent or a sulfamate water reducing agent.
According to another aspect of the invention, a preparation method of an RPC cover plate for a tunnel bridge is provided, which comprises the following steps:
(1) adding cement, quartz sand, composite elastomer particles, steel fibers, mineral admixture, water reducer and water into a stirrer according to the parts by weight, and uniformly stirring and mixing to obtain concrete slurry;
(2) placing the finished mould on a vibration table, opening the vibration table, pouring the stirred concrete slurry into the mould until the mould is completely formed, and thus obtaining the initially-formed RPC cover plate;
(3) and (3) placing the preliminarily molded RPC cover plate into a curing chamber for curing to obtain an initially solidified RPC cover plate, separating the initially solidified RPC cover plate from the mold to obtain a demolded RPC cover plate, and then sending the demolded RPC cover plate into the curing chamber for steam curing at the curing temperature of 80-90 ℃ for 1-2 days.
Compared with the prior art, the invention has the following characteristics:
1) in the composite elastomer particles adopted by the raw material components of the RPC cover plate, the regenerated rubber particles and the SEBS thermoplastic elastomer are used as base materials, nylon is introduced, and maleic anhydride grafted ethylene propylene diene monomer is used as a compatilizer, so that the interface acting force of the nylon, the regenerated rubber particles and the SEBS thermoplastic elastomer can be improved, the high-efficiency compatibility of the nylon, the regenerated rubber particles and the SEBS thermoplastic elastomer can be improved, the integration of the mixture of the nylon, the regenerated rubber particles and the SEBS thermoplastic elastomer can be promoted, and the temperature resistance, oil resistance and corrosion resistance of the composite elastomer particles can be effectively improved;
2) due to the fact that the composite elastomer particles are introduced into the material system, the toughness of the RPC cover plate can be effectively improved, the composite elastomer particles are doped in cement and quartz sand, vibration energy can be consumed, vibration amplitude is reduced, the vibration energy can be absorbed when the RPC cover plate is impacted, the dynamic response amplitude of the structure is reduced, and the problem that the conventional RPC cover plate is easily subjected to brittle damage due to high brittleness can be effectively solved;
3) the mineral admixture is introduced into the material system, the mineral admixture, the cement and the quartz sand can jointly exert high-efficiency bonding performance, the economic cost is reduced, and the strength of the final RPC cover plate can be effectively improved due to the use of the steel fiber.
Detailed Description
The inventor of the invention has conducted extensive and intensive studies to find that the composite elastomer particles are introduced into the raw material components of the RPC cover plate, the regenerated rubber particles and the SEBS thermoplastic elastomer are used as the base materials, the nylon is introduced, and the maleic anhydride grafted ethylene propylene diene monomer is used as the compatilizer, so that the interface acting force of the nylon, the regenerated rubber particles and the SEBS thermoplastic elastomer can be improved, the efficient compatibility of the nylon, the regenerated rubber particles and the SEBS thermoplastic elastomer can be improved, the mixture of the nylon, the regenerated rubber particles and the SEBS thermoplastic elastomer can be promoted to be integrated, the temperature resistance, the oil resistance and the corrosion resistance of the composite elastomer particles can be effectively improved, the toughness of the RPC cover plate can be effectively improved by using the composite elastomer particles, and the prepared RPC cover plate has high ductility and strength.
On the basis of this, the present invention has been completed.
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed embodiment and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of protection of the present invention.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein. As used herein, the term "about" when used to modify a numerical value means within + -5% of the error margin measured for that value.
The technical scheme of the invention is further illustrated by the following specific examples, and the raw materials used in the invention are all commercial products unless otherwise specified.
The following table 1 shows the raw material components and the weight part contents of the RPC cover plates of examples 1 to 5 and comparative example.
TABLE 1 formulation of raw ingredients for RPC cover plates of examples 1-5 and comparative examples
Note: in the comparative example in Table 1, "/" indicates that the raw material components do not contain the composite elastomer particles.
In Table 1, the adopted cement is formed by mixing 52.5-grade ordinary portland cement and 42.5R-grade fly ash portland cement according to the mass ratio of 5: 1; the grain diameter of the adopted quartz sand is less than or equal to 2mm, and SiO is adopted2The content is more than or equal to 98 percent, and the mud content is less than or equal to 0.5 percent.
In Table 1, the steel fibers used in examples 1 to 2 had a diameter of 0.4mm, a length of 25mm and a tensile strength of not less than 1000 MPa; the diameter of the steel fiber used in the example 3 and the comparative example is 0.5mm, the length is 25mm, and the tensile strength is more than or equal to 1000 MPa; the steel fibers used in examples 4 to 5 had a diameter of 0.6mm, a length of 20mm and a tensile strength of not less than 1000 MPa.
In Table 1, the mineral admixtures used in examples 1 to 3 and comparative example were S105-grade slag powders having specific surface areas of 700m or more2Kg, density 2.9g/cm3(ii) a The mineral admixture used in examples 4 to 5 was S115 grade slag powder with a specific surface area of not less than 700m2Kg, density 2.9g/cm3。
In Table 1, the water reducing agent used in examples 1-2 was a lignosulfonate water reducing agent; the water reducing agents used in the embodiment 3 and the comparative example are prepared by mixing a naphthalene water reducing agent and a melamine water reducing agent according to the mass ratio of 1: 2; the water reducing agent used in examples 4-5 was a sulfamate water reducing agent.
The following table 2 shows the formulations of the composite elastomer particles used in examples 1-5.
TABLE 2 formulations of composite elastomer particles used in examples 1-5
In Table 2, the maleic anhydride-grafted ethylene-propylene-diene monomer rubber used in examples 1-2 had a grafting ratio of 1.2%, and the deactivator used was N-salicylidene-N-salicyloyl hydrazide; the grafting ratio of the maleic anhydride-grafted ethylene-propylene-diene monomer rubber used in example 3 was 1.6%, and the deactivator used was bis [ ethyl-3- (3, 5-di-tert-butyl-4-hydroxyphenyl) ]2, 2-oxamide; the maleic anhydride-grafted ethylene-propylene-diene rubber used in examples 4 to 5 had a grafting degree of 1.8%, and the deactivator used was N-salicylidene-N-salicyloyl hydrazide. The organic peroxide used in the examples in table 2 was dibenzoyl peroxide.
The preparation of the composite elastomer particles of examples 1 to 5 was as follows:
adding the regenerated rubber particles, the SEBS thermoplastic elastomer and the maleic anhydride grafted ethylene propylene diene monomer into a stirrer according to parts by weight, uniformly stirring and mixing, then adding the organic peroxide, the zinc palmitate soap and the passivator according to parts by weight, uniformly stirring and mixing, then adding the nylon 6 and the polyethylene wax according to parts by weight, uniformly stirring and mixing, introducing into a double-screw extruder, after melt extrusion, cooling, dehumidifying, granulating and drying, thus obtaining the composite elastomer particles with the particle size of less than or equal to 1 mm.
In the specific processing procedure, the process conditions of the twin-screw extruder used in examples 1-2 were: the temperature of a first zone is 190 ℃, the temperature of a second zone is 190 ℃, the temperature of a third zone is 195 ℃, the temperature of a fourth zone is 195 ℃, the temperature of a fifth zone is 200 ℃, the temperature of a sixth zone is 200 ℃, the temperature of a seventh zone is 205 ℃, the temperature of an eighth zone is 205 ℃, the temperature of a ninth zone is 210 ℃, the rotating speed of a main engine is 350 r/min, the vacuum is-0.06 MPa, and the pressure is 3.5 MPa;
the process conditions of the twin-screw extruder used in example 3 were: the temperature of the first zone is 200 ℃, the temperature of the second zone is 200 ℃, the temperature of the third zone is 210 ℃, the temperature of the fourth zone is 210 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 220 ℃, the temperature of the seventh zone is 230 ℃, the temperature of the eighth zone is 230 ℃, the temperature of the ninth zone is 235 ℃, the rotating speed of a main engine is 400 rpm, the vacuum is-0.06 MPa, and the pressure is 6 MPa;
the process conditions of the twin-screw extruder used in examples 4 to 5 were: the temperature of the first zone is 220 ℃, the temperature of the second zone is 220 ℃, the temperature of the third zone is 225 ℃, the temperature of the fourth zone is 225 ℃, the temperature of the fifth zone is 230 ℃, the temperature of the sixth zone is 230 ℃, the temperature of the seventh zone is 235 ℃, the temperature of the eighth zone is 235 ℃, the temperature of the ninth zone is 240 ℃, the rotating speed of a main engine is 450 rpm, the vacuum is-0.06 MPa, and the pressure is 4.5 MPa.
The materials of examples 1-5 and comparative examples were made into RPC cover plates using the following method:
(1) adding cement, quartz sand, composite elastomer particles, steel fibers, mineral admixture, water reducer and water into a stirrer according to the parts by weight, and uniformly stirring and mixing to obtain concrete slurry;
(2) placing the finished mould on a vibration table, opening the vibration table, pouring the stirred concrete slurry into the mould until the mould is completely formed, and thus obtaining the initially-formed RPC cover plate;
(3) and (3) placing the preliminarily molded RPC cover plate into a curing chamber for curing to obtain an initially solidified RPC cover plate, separating the initially solidified RPC cover plate from the mold to obtain a demolded RPC cover plate, and then sending the demolded RPC cover plate into the curing chamber for steam curing at the curing temperature of 80-90 ℃ for 1-2 days.
Comparative example an RPC cover plate was made using the same procedure as described above.
The following table 3 shows the performance test results of the RPC cover plates manufactured using the raw material component formulations of examples 1-5 and comparative example.
TABLE 3 Performance test results of RPC cover sheets made from the stock component formulations of examples 1-5 and comparative example
The test results in table 3 show that, compared with example 3, the raw materials of the comparative example do not contain the composite elastomer particles, and the compressive strength, the flexural strength and the elastic modulus of the raw materials are all obviously lower than those of example 3, which indicates that the mechanical properties of the final RPC cover plate can be effectively improved by introducing a proper amount of the composite elastomer particles into the raw material components, and the RPC cover plate can have both high compressive strength and high flexural strength. Under the same experimental conditions, the chloride ion diffusion coefficient and the abrasion coefficient of the RPC cover plate in the embodiment 3 are both obviously smaller than those of the comparative example, which shows that the RPC cover plate has higher erosion resistance and abrasion resistance, and is beneficial to prolonging the service life of the cover plate.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The RPC cover plate for the tunnel bridge is characterized by being prepared from the following raw materials in parts by weight: 100-200 parts of cement, 300-600 parts of quartz sand, 5-20 parts of composite elastomer particles, 20-40 parts of steel fibers, 50-70 parts of mineral admixture, 1-10 parts of water reducing agent and 30-50 parts of water.
2. The RPC cover plate for the tunnel bridge according to claim 1, wherein the cement is formed by mixing 52.5-grade ordinary portland cement and 42.5R-grade fly ash portland cement according to a mass ratio of 5: 1.
3. The RPC cover plate for tunnel bridges of claim 1, wherein the particle size of the quartz sand is less than or equal to 2mm, and SiO is2The content is more than or equal to 98 percent, and the mud content is less than or equal to 0.5 percent.
4. The RPC cover plate for the tunnel bridge of claim 1, wherein the composite elastomer particles are prepared from the following raw materials in parts by weight: 50-80 parts of regenerated rubber particles, 20-40 parts of SEBS thermoplastic elastomer, 2-10 parts of maleic anhydride grafted ethylene propylene diene monomer, 0.1-1 part of organic peroxide, 610-15 parts of nylon, 1-3 parts of zinc palmitate soap, 1-2 parts of polyethylene wax and 0.1-0.8 part of passivator.
5. The RPC cover plate for the tunnel bridge according to claim 4, wherein the grafting ratio of the maleic anhydride grafted ethylene propylene diene monomer is 1.2-1.8%;
the passivating agent is selected from N-salicylidene-N-salicylide or bis [ ethyl-3- (3, 5-di-tert-butyl-4-hydroxyphenyl) ]2, 2-oxamide.
6. The RPC cover plate for the tunnel bridge of claim 4, wherein the preparation method of the composite elastomer particles comprises the following steps: adding the regenerated rubber particles, the SEBS thermoplastic elastomer and the maleic anhydride grafted ethylene propylene diene monomer into a stirrer according to parts by weight, uniformly stirring and mixing, then adding the organic peroxide, the zinc palmitate soap and the passivator according to parts by weight, uniformly stirring and mixing, then adding the nylon 6 and the polyethylene wax according to parts by weight, uniformly stirring and mixing, introducing into a double-screw extruder, after melt extrusion, cooling, dehumidifying, granulating and drying to obtain the composite elastomer particles.
7. The RPC cover plate for the tunnel bridge according to claim 1, wherein the diameter of the steel fiber is 0.4-0.6mm, the length is 20-25mm, and the tensile strength is greater than or equal to 1000 MPa.
8. The RPC cover plate for tunnel bridges of claim 1, wherein the mineral admixture is S105-grade slag powder or S115-grade slag powder, and the specific surface area is not less than 700m2Kg, density 2.9g/cm3。
9. The RPC cover plate for the tunnel bridge according to claim 1, wherein the water reducer is selected from one or more of lignosulfonate water reducer, naphthalene water reducer, melamine water reducer or sulfamate water reducer.
10. The method for preparing an RPC cover plate for a tunnel bridge according to any one of claims 1 to 9, which comprises the following steps:
(1) adding cement, quartz sand, composite elastomer particles, steel fibers, mineral admixture, water reducer and water into a stirrer according to the parts by weight, and uniformly stirring and mixing to obtain concrete slurry;
(2) placing the finished mould on a vibration table, opening the vibration table, pouring the stirred concrete slurry into the mould until the mould is completely formed, and thus obtaining the initially-formed RPC cover plate;
(3) and (3) placing the preliminarily molded RPC cover plate into a curing chamber for curing to obtain an initially solidified RPC cover plate, separating the initially solidified RPC cover plate from the mold to obtain a demolded RPC cover plate, and then sending the demolded RPC cover plate into the curing chamber for steam curing at the curing temperature of 80-90 ℃ for 1-2 days.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103073887A (en) * | 2013-01-14 | 2013-05-01 | 东莞市明聚塑胶有限公司 | Modified elastomer of nylon 1212 and preparation method thereof |
| CN108863199A (en) * | 2018-10-10 | 2018-11-23 | 天津市昊鹏建材股份有限公司 | A kind of high-elastic cracking resistance formula preparation method for building for pouring mortar |
| CN111410485A (en) * | 2020-04-20 | 2020-07-14 | 容七英 | Rainwater grate cover plate made of RPC (reactive powder concrete) material and manufacturing method thereof |
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2020
- 2020-09-14 CN CN202010962462.7A patent/CN112047694A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103073887A (en) * | 2013-01-14 | 2013-05-01 | 东莞市明聚塑胶有限公司 | Modified elastomer of nylon 1212 and preparation method thereof |
| CN108863199A (en) * | 2018-10-10 | 2018-11-23 | 天津市昊鹏建材股份有限公司 | A kind of high-elastic cracking resistance formula preparation method for building for pouring mortar |
| CN111410485A (en) * | 2020-04-20 | 2020-07-14 | 容七英 | Rainwater grate cover plate made of RPC (reactive powder concrete) material and manufacturing method thereof |
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Application publication date: 20201208 |