CN112592114A - Waterproof and antirust material for PC (polycarbonate) component - Google Patents
Waterproof and antirust material for PC (polycarbonate) component Download PDFInfo
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- CN112592114A CN112592114A CN202011465112.6A CN202011465112A CN112592114A CN 112592114 A CN112592114 A CN 112592114A CN 202011465112 A CN202011465112 A CN 202011465112A CN 112592114 A CN112592114 A CN 112592114A
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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
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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
- 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
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/61—Corrosion inhibitors
-
- 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
- C04B2111/26—Corrosion of reinforcement 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
- 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
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of concrete building materials, and particularly relates to a waterproof and antirust material for a PC (polycarbonate) member. The waterproof and antirust material comprises the following components in parts by weight: 300-360 parts of cement, 500-610 parts of quartz sand, 900-1100 parts of gravel, 30-60 parts of fly ash, 30-50 parts of mineral powder, 150-180 parts of water, 12-20 parts of steel fiber, 8-15 parts of antirust agent, 6-9 parts of water reducing agent and 2-5 parts of defoaming agent; the antirust agent comprises the following components in parts by weight: 3-5 parts of copper tetraammine sulfate, 2-4 parts of modified silica sol, 1-2 parts of acrylate emulsion, 0.5-2 parts of sodium fluosilicate and 0.5-1 part of film-forming auxiliary agent. The antirust agent disclosed by the invention is matched with the steel fiber, a passive film is formed on the surface of the steel bar in the concrete, and the corrosion reaction caused by the entry of external water and air is effectively prevented, so that the antirust performance of the PC member is improved.
Description
Technical Field
The invention belongs to the technical field of concrete building materials, and particularly relates to a waterproof and antirust material for a PC (polycarbonate) member.
Background
The fabricated concrete (PC) member is widely applied to the fields of buildings, traffic, water conservancy and the like, and plays an important role in the construction of national infrastructure, such as prefabricated reinforced concrete column foundation foundations, prefabricated steel structure steel column foundations, street lamp billboard column reinforced concrete foundations, prefabricated floor slabs and the like. The production of the PC member generally relates to the steps of mold assembly, reinforcement cage installation, concrete pouring, construction, form removal and hoisting, member surface repair, member warehousing maintenance and the like.
The premixed concrete is usually formed by mixing cement, aggregate, an additive and water according to a certain proportion, but the prior concrete is easy to shrink and crack after being poured, has low tensile strength and the like, has poor fluidity and workability, is difficult to ensure the compactness of the concrete by depending on manual vibration under the condition of a steel bar structure, and can generate a porous structure due to a large amount of unremoved air bubbles inside a PC member. The structural defects further influence the durability of the PC components, so that the rust resistance and corrosion resistance of the building are greatly reduced, particularly in the south and coastal areas with damp and rainy days, buildings, roads, bridges and the like are easily corroded by rainwater under the influence of the quality of the PC components, even internal reinforcing steel bars are rusted, and the stability and durability of the building are seriously influenced.
Along with the multifunctionalization of concrete engineering, the complexity of construction and application environment and the optimization of resources and environment, people also put forward higher requirements on concrete materials. At present, in order to improve the durability of concrete or PC members, a water reducing agent or a compacting agent is often added to a ready-mixed concrete formula to improve the strength of PC members, such as a concrete formula disclosed in patent document CN111574153A, but there are few methods for enhancing the rust-proof and corrosion-proof functions of rust-proof PC members. The Chinese patent application with publication number CN111961361A provides a heat-insulating and antirust composition, which comprises antirust mortar and sealing paint, wherein the antirust mortar is required to be coated on the surface of a bound reinforcement cage bone by spraying, mixed-embroidery spraying is carried out, and then the waterproof sealing paint is sprayed on the outer surface of the maintained antirust mortar.
Disclosure of Invention
The invention aims to solve the technical problems and provides a waterproof and antirust material for a PC (polycarbonate) member, which is improved in waterproof, antirust and durable performances by a reasonable formula and a simple preparation method.
The above object of the present invention is achieved by the following technical solutions:
a waterproof and antirust material for a PC component comprises the following components in parts by weight: 300-360 parts of cement, 500-610 parts of quartz sand, 900-1100 parts of gravel, 30-60 parts of fly ash, 30-50 parts of mineral powder, 150-180 parts of water, 12-20 parts of steel fiber, 8-15 parts of antirust agent, 6-9 parts of water reducing agent and 2-5 parts of defoaming agent.
Further, the waterproof and antirust material for the PC component comprises the following components in parts by weight: 350 parts of cement 320-350 parts, 600 parts of quartz sand 550-1050 parts, 35-45 parts of fly ash, 30-40 parts of mineral powder, 170 parts of water 160-170 parts, 15-19 parts of steel fiber, 6-7 parts of water reducing agent, 4-6 parts of antirust agent and 3-4 parts of defoaming agent.
Further, the antirust agent comprises the following components in parts by weight: 3-5 parts of copper tetraammine sulfate, 2-4 parts of modified silica sol, 1-2 parts of acrylate emulsion, 0.5-2 parts of sodium fluosilicate and 0.5-1 part of film-forming auxiliary agent.
According to the invention, the mineral powder and the fly ash can increase the compressive strength of the concrete, reduce the cracking problem of the concrete caused by poor early strength performance, improve the compactness, reduce the water addition amount under the action of the water reducing agent and improve the anti-seepage and anti-erosion capabilities. The steel fiber is added to improve the toughness and the impact strength of concrete, the steel fibers with various different cross sections are selected to increase the interface cohesiveness of the steel fibers and the concrete, the improvement of the dispersibility of various raw materials is facilitated, the steel fibers can be adsorbed on the surface of a reinforcing steel bar to form a good and stable net structure inside the concrete, and the defoaming agent can reduce the formation of air cells in the vibration process of the concrete. The antirust agent component can be filled in concrete micropores by virtue of the powerful permeability of the steel fibers, is combined with the steel fibers to form a closed waterproof layer whole to prevent the corrosion of water or other liquid from the outside, and can act on the surface of the steel bar under the permeation and transmission effects of the steel fibers, thereby playing a role in protecting the steel bar. The copper tetraammine sulfate in the antirust agent can be adsorbed on steel fibers, a layer of passive film is formed on the surface of the steel bar under the combined action of the acrylate emulsion, the modified silica sol and the film-forming additive, and the steel bar is limited to be in contact with external gas or moisture to generate corrosion reaction, so that the antirust performance of the steel bar in the PC member is improved. The copper tetrammine sulfate and the steel fibers can also play a role of a stabilizer, so that the stable dispersion of the antirust agent is ensured, the interference of other components on the stability of the antirust agent is avoided, and the overall stability and durability of the PC component are further enhanced.
Further, the modified silica sol is obtained by mixing and dispersing vinyl triethoxysilane, ethyl orthosilicate and silica sol in a mass ratio of 2:1 (3-6) for 30-50 min by ultrasound.
The modified silica sol is added with the vinyltriethoxysilane as a modified material, and is grafted with the silica sol to improve the film forming property and enhance the compactness and the bonding force of the antirust agent after the antirust agent forms a film on the surface of the steel bar.
Furthermore, the waterproof and antirust material of the PC component also comprises 10-18 parts by weight of macroporous resin.
The macroporous resin is a porous skeleton structure formed by cross-linking and polymerizing styrene and acrylic ester as monomers, has extremely high porosity in the interior in a dry state, has the characteristics of large surface area and strong adsorbability, and can adsorb substances with different properties from different media. The macroporous resin is added into the premixed concrete, so that water or other pollutants entering from the outside can be adsorbed by utilizing the super-strong adsorption performance of the macroporous resin, the water is prevented from entering the inside from pores to corrode a reinforcing steel bar, and the influence of environmental factors on the quality of a PC member is further avoided.
Furthermore, the waterproof and antirust material for the PC component also comprises 2-5 parts by weight of a synergist.
Further preferably, the reinforcing agent comprises the following components in parts by weight: 1-2 parts of reinforcing agent, 0.8-1.2 parts of dispersing agent, 0.1-0.5 part of maleic anhydride and 0.1-1.3 parts of water.
More preferably, the enhancer is at least one of triethylenetetramine, glycerol trimer, glycerol, and triethanolamine.
More preferably, the dispersant is at least one of hexylene bis stearamide, stearic acid monoglyceride, tristearin, oleic acid acyl, methylsulfonylpiperazine and phenylsulfonylpiperazine.
Furthermore, the waterproof and antirust material for the PC component also comprises 1-3.5 parts by weight of a bactericide.
Further, the water reducing agent is a polycarboxylic acid water reducing agent with the water reducing rate of more than or equal to 28 percent.
Further, the defoaming agent is organic silicone oil and/or mineral oil amide polymer.
Furthermore, the fineness modulus of the quartz sand is 1.8-2.5.
Furthermore, the particle size of the macadam is 3-5 mm.
Furthermore, the particle size of the macroporous resin used in the invention is 0.2-0.8 nm.
Another object of the present invention is to provide a method for preparing concrete for PC members from the above waterproof and antirust material, comprising the steps of:
weighing the raw materials in parts by weight;
firstly adding quartz sand, broken stone and mineral powder into a stirrer for mixing, then adding cement, fly ash, steel fiber and an antirust agent for stirring together, then adding a water reducing agent, a defoaming agent and water into the stirrer after uniformly mixing, and continuously stirring uniformly to obtain concrete;
and placing the concrete into a curing room for curing, and testing the compressive strength of the concrete after the concrete reaches the specified age.
The concrete preparation method provided by the invention is simple to operate, and due to reasonable proportioning of the formula, the components can be rapidly dispersed and uniformly mixed, so that the production efficiency is ensured while the quality and stability of the concrete are improved.
Compared with the prior art, the invention has the following advantages:
1. the antirust agent disclosed by the invention is matched with the steel fiber, and a passive film is formed on the surface of the steel bar in the concrete, so that the corrosion reaction caused by the entry of external water and air can be effectively prevented, and the antirust performance of a PC (polycarbonate) component is improved;
2. the tetramine sulfate is beneficial to stable dispersion of the antirust agent in concrete, and meanwhile, the modified silica sol in the antirust agent is beneficial to improving the film forming property after modification treatment, and the compactness and the bonding force after film forming are increased;
3. according to the invention, macroporous resin is added in the precast concrete raw material, and has super strong adsorption capacity on substances in different media, so that external moisture or gas can be further prevented from entering the concrete to cause rusting, and the antirust property and durability of the PC component are improved;
4. the concrete of the invention has reasonable formula and simple preparation method, improves the strength and the water-resistant and corrosion-resistant capability of the concrete, is beneficial to improving the production efficiency of PC members and reducing the production cost.
Detailed Description
The technical solution of the present invention is further described and illustrated by the following specific examples. The raw materials used in the examples of the present invention are those commonly used in the art, and the methods used in the examples are those conventional in the art, unless otherwise specified. It should be understood that the specific embodiments described herein are merely to aid in the understanding of the invention and are not intended to limit the invention specifically.
Example 1
Embodiment 1 provides a waterproof and antirust material for PC members, comprising the following components in parts by weight: 350 parts of cement, 560 parts of quartz sand, 1000 parts of broken stone, 50 parts of fly ash, 45 parts of mineral powder, 170 parts of water, 16 parts of steel fiber, 13 parts of antirust agent, 12 parts of macroporous resin, 7 parts of water reducing agent, 3 parts of defoaming agent and 3 parts of synergist; wherein the fineness modulus of the quartz sand is 2.2, the crushed stone has a particle size of 3-5mm, the particle size of the macroporous resin is 0.5-0.8 nm, the water reducing agent is a polycarboxylic acid water reducing agent with a water reducing rate of more than or equal to 28%, and the defoaming agent is cyclohexanediacetic acid monoamide.
The antirust agent of the embodiment comprises the following components in parts by weight: 4.5 parts of copper tetraammine sulfate, 3.5 parts of modified silica sol, 2 parts of acrylate emulsion, 2 parts of sodium fluosilicate and 1 part of film-forming assistant; wherein the modified silica sol is obtained by mixing and dispersing vinyl triethoxysilane, ethyl orthosilicate and silica sol in a mass ratio of 2:1:4 for 40min by ultrasound.
The synergist of the embodiment comprises the following components in parts by weight: 1.5 parts of tripropylene glycol, 0.8 part of glyceryl tristearate, 0.2 part of maleic anhydride and 0.5 part of water.
Example 2
Embodiment 2 provides a waterproof and antirust material for PC members, comprising the following components in parts by weight: 320 parts of cement, 600 parts of quartz sand, 1050 parts of broken stone, 40 parts of fly ash, 45 parts of mineral powder, 170 parts of water, 15 parts of steel fiber, 13 parts of antirust agent, 12 parts of macroporous resin, 8 parts of water reducing agent, 3 parts of defoaming agent and 3 parts of synergist; wherein the quartz sand, the broken stone, the macroporous resin, the water reducing agent, the antirust agent, the synergist and the defoaming agent are the same as those in the embodiment 1.
Example 3
Embodiment 3 provides a waterproof and antirust material for PC members, comprising the following components in parts by weight: 350 parts of cement, 580 parts of quartz sand, 950 parts of broken stone, 60 parts of fly ash, 50 parts of mineral powder, 180 parts of water, 12 parts of steel fiber, 13 parts of antirust agent, 12 parts of macroporous resin, 8 parts of water reducing agent, 3 parts of defoaming agent and 3 parts of synergist; wherein the quartz sand, the broken stone, the macroporous resin, the water reducing agent, the antirust agent, the synergist and the defoaming agent are the same as those in the embodiment 1.
Example 4
Embodiment 4 provides a waterproof and antirust material for PC members, comprising the following components in parts by weight: 350 parts of cement, 550 parts of quartz sand, 1050 parts of broken stone, 55 parts of fly ash, 35 parts of mineral powder, 160 parts of water, 19 parts of steel fiber, 13 parts of antirust agent, 12 parts of macroporous resin, 12 parts of water reducing agent, 3 parts of defoaming agent and 3 parts of synergist; wherein the quartz sand, the broken stone, the macroporous resin, the water reducing agent, the antirust agent, the synergist and the defoaming agent are the same as those in the embodiment 1.
Example 5
Embodiment 5 provides a waterproof and antirust material for PC members, comprising the following components in parts by weight: 350 parts of cement, 560 parts of quartz sand, 1000 parts of broken stone, 50 parts of fly ash, 45 parts of mineral powder, 170 parts of water, 16 parts of steel fiber, 10 parts of antirust agent, 12 parts of macroporous resin, 7 parts of water reducing agent, 3 parts of defoaming agent and 3 parts of synergist; the antirust agent comprises the following components in parts by weight: 4 parts of copper tetrammine sulfate, 3 parts of modified silica sol, 1.5 parts of acrylate emulsion, 1 part of sodium fluosilicate and 0.5 part of film-forming assistant; wherein the modified silica sol is obtained by mixing and dispersing vinyl triethoxysilane, ethyl orthosilicate and silica sol in a mass ratio of 2:1:4 for 40min by ultrasound; the quartz sand, crushed stone, macroporous resin, water reducing agent, synergist and defoamer used in the method are the same as those in example 1.
Example 6
Embodiment 6 provides a waterproof and antirust material for PC members, comprising the following components in parts by weight: 350 parts of cement, 560 parts of quartz sand, 1000 parts of broken stone, 50 parts of fly ash, 45 parts of mineral powder, 170 parts of water, 16 parts of steel fiber, 6 parts of antirust agent, 9 parts of macroporous resin, 7 parts of water reducing agent, 3 parts of defoaming agent and 3 parts of synergist; the antirust agent comprises the following components in parts by weight: 2.5 parts of copper tetraammine sulfate, 1.5 parts of modified silica sol, 1 part of acrylate emulsion, 0.5 part of sodium fluosilicate and 0.5 part of film-forming assistant; the quartz sand, crushed stone, macroporous resin, water reducing agent, synergist and defoamer used were the same as in example 1.
Example 7
Example 7 provides a waterproof and antirust material for PC members, which is different from example 1 only in that it does not contain a macroporous resin and the remaining components are the same as those of example 1.
Example 8
Example 8 provides a waterproof and antirust material for PC members, which differs from example 1 only in that the modified silica sol in the antirust agent is replaced with a normal silica sol, and the remaining components are the same as in example 1.
Example 9
The concrete test block is prepared from the waterproof and antirust material in the embodiment 1-8, and the concrete method comprises the following steps:
weighing the raw material components in parts by weight;
firstly adding quartz sand, broken stone and mineral powder into a stirrer for mixing, then adding cement, fly ash, steel fiber, composite expanding agent and synergist for stirring together, then adding the retarding and water reducing agent and water into the stirrer after uniformly mixing, and continuously stirring uniformly to obtain concrete;
and (2) putting the concrete into a curing chamber for curing, curing for 6 hours under the constant temperature condition of 85 ℃ under normal pressure, curing for 8 hours under high temperature and high pressure, wherein the constant pressure is 0.9-1.0 MPa, the constant temperature is 160 ℃, and cooling to normal temperature after curing.
Comparative example 1
Comparative example 1 provides a concrete which was prepared in the same manner as in example 9 except that the rust inhibitor was not added to the raw material composition of example 1 and the remaining composition was the same as that of example 1.
Comparative example 2
Comparative example 2 provides a concrete which was prepared in the same manner as in example 9 except that the steel fibers were not added to the raw material composition of example 1 and the remaining composition was the same as that of example 1.
The concrete prepared in examples 1 to 8 and comparative examples 1 to 2 was subjected to a water permeation pressure resistance ratio test with reference to the DBJ01-54-2001 interfacial permeation type waterproof paint quality test evaluation criteria, and the waterproof property thereof was examined with reference to the test method of JC/T1018-2006 aqueous permeation type inorganic waterproof agent, and the results are shown in the following table.
TABLE 1 results of Performance test of examples 1-8 and comparative examples 1-2
| Test items | Pressure ratio of water permeation resistance/%) | Penetration height/mm |
| Example 1 | 920 | 12 |
| Example 2 | 890 | 11 |
| Example 3 | 900 | 14 |
| Example 4 | 870 | 13 |
| Example 5 | 950 | 12 |
| Example 6 | 760 | 18 |
| Example 7 | 750 | 22 |
| Example 8 | 790 | 24 |
| Comparative example 1 | 530 | 31 |
| Comparative example 2 | 610 | 29 |
The above embodiments are not exhaustive of the range of parameters of the claimed technical solutions of the present invention and the new technical solutions formed by equivalent replacement of single or multiple technical features in the technical solutions of the embodiments are also within the scope of the claimed technical solutions of the present invention, and if no specific description is given for all the parameters involved in the technical solutions of the present invention, there is no unique combination of the parameters with each other that is not replaceable.
The specific embodiments described herein are merely illustrative of the spirit of the invention and do not limit the scope of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. The waterproof and antirust material for the PC component is characterized by comprising the following components in parts by weight: 300-360 parts of cement, 500-610 parts of quartz sand, 900-1100 parts of gravel, 30-60 parts of fly ash, 30-50 parts of mineral powder, 150-180 parts of water, 12-20 parts of steel fiber, 8-15 parts of antirust agent, 6-9 parts of water reducing agent and 2-5 parts of defoaming agent.
2. The waterproof and antirust material for PC members according to claim 1, wherein the antirust agent comprises the following components in parts by weight: 3-5 parts of copper tetraammine sulfate, 2-4 parts of modified silica sol, 1-2 parts of acrylate emulsion, 0.5-2 parts of sodium fluosilicate and 0.5-1 part of film-forming auxiliary agent.
3. The waterproof and antirust material for the PC component as claimed in claim 2, wherein the modified silica sol is obtained by ultrasonic mixing and dispersing of vinyltriethoxysilane, tetraethoxysilane and silica sol in a mass ratio of 2:1 (3-6).
4. The waterproof and antirust material for PC members according to any one of claims 1 to 3, wherein the waterproof and antirust material further comprises 10 to 18 parts by weight of a macroporous resin.
5. The waterproof and antirust material for PC members according to claim 4, wherein the particle diameter of the macroporous resin is 0.2 to 0.8 nm. .
6. The waterproof and antirust material for PC members according to claim 1, further comprising 2 to 5 parts by weight of a synergist.
7. The waterproof and antirust material for PC members as claimed in claim 6, wherein the reinforcing agent comprises the following components in parts by weight: 1-2 parts of reinforcing agent, 0.8-1.2 parts of dispersing agent, 0.1-0.5 part of maleic anhydride and 0.1-1.3 parts of water.
8. The waterproof and antirust material for PC members as claimed in claim 7, wherein said reinforcing agent is at least one of triethylenetetramine, glycerol trimer, glycerol, and triethanolamine.
9. The waterproof and antirust material for PC members as claimed in claim 7, wherein said dispersant is at least one of hexylene bis stearamide, stearic acid monoglyceride, tristearic acid glyceride, oleic acid acyl, methanesulfonyl piperazine, benzenesulfonyl piperazine.
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| CN115784704A (en) * | 2022-11-14 | 2023-03-14 | 北京易晟元环保工程有限公司 | Acid-corrosion-resistant concrete structure repair material, preparation method and repair construction method |
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| CN115784704A (en) * | 2022-11-14 | 2023-03-14 | 北京易晟元环保工程有限公司 | Acid-corrosion-resistant concrete structure repair material, preparation method and repair construction method |
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