CN115432963B - Grouting material for prestressed duct of highway bridge - Google Patents
Grouting material for prestressed duct of highway bridge Download PDFInfo
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- CN115432963B CN115432963B CN202210942838.7A CN202210942838A CN115432963B CN 115432963 B CN115432963 B CN 115432963B CN 202210942838 A CN202210942838 A CN 202210942838A CN 115432963 B CN115432963 B CN 115432963B
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- grouting material
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- highway bridge
- lignin sulfonate
- prestressed duct
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- 239000000463 material Substances 0.000 title claims abstract description 52
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 23
- KEZYHIPQRGTUDU-UHFFFAOYSA-N 2-[dithiocarboxy(methyl)amino]acetic acid Chemical compound SC(=S)N(C)CC(O)=O KEZYHIPQRGTUDU-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 239000004568 cement Substances 0.000 claims abstract description 11
- 239000010881 fly ash Substances 0.000 claims abstract description 8
- 239000011325 microbead Substances 0.000 claims abstract description 8
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 7
- 230000005764 inhibitory process Effects 0.000 abstract description 7
- 230000002195 synergetic effect Effects 0.000 abstract description 5
- 230000002829 reductive effect Effects 0.000 abstract description 2
- 239000008030 superplasticizer Substances 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 18
- 239000010959 steel Substances 0.000 description 18
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 15
- 239000002002 slurry Substances 0.000 description 12
- 238000012360 testing method Methods 0.000 description 7
- 230000000740 bleeding effect Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 210000002435 tendon Anatomy 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229920005552 sodium lignosulfonate Polymers 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 229920000142 Sodium polycarboxylate Polymers 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003068 static effect Effects 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
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- 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)
- Bridges Or Land Bridges (AREA)
Abstract
The application discloses a prestressed duct grouting material for a highway bridge, and relates to the technical field of highway bridge construction. The raw materials comprise, by mass: 48 to 58 parts of cement, 2 to 8 parts of fly ash, 2 to 8 parts of microbeads, 3 parts of expanding agent, 0.99 to 1.03 parts of water reducing agent, 0.02 to 0.06 part of sodium lignin sulfonate and 0.25 part of sodium metasilicate pentahydrate. According to the application, on the premise that the fluidity of the grouting material meets the standard requirement, the repeated blending of sodium lignin sulfonate and the polycarboxylate superplasticizer is utilized, the time loss of the fluidity is reduced, and the stability and the strength of the grouting material are improved. The application utilizes the complex doping of sodium lignin sulfonate and sodium metasilicate pentahydrate to exert a synergistic corrosion inhibition effect, so that the grouting material has better corrosion inhibition performance.
Description
Technical Field
The application relates to the technical field of highway bridge construction, in particular to a highway bridge prestressed duct grouting material.
Background
The grouting material is used as cement paste applied to a prestressed duct, has the properties of good fluidity, high strength, micro expansion and the like, can protect the prestressed tendons from being corroded by external ions, is bonded with the prestressed tendons, can exert the synergistic effect of a beam body concrete structure and the prestressed tendons, and improves the overall safety and stability of the box girder.
Through field investigation, in order to avoid the problems of low fluidity and large loss of fluidity with time of grouting materials prepared on the engineering field, and in order to facilitate grouting, workers usually adjust the water-cement ratio to 0.3, so that the problems of serious grouting material bleeding and slurry shrinkage are caused, the grouting stability is low, and a cavity is easy to form in a pore canal after grouting; the problems that the hardening strength of the internal pressure sizing agent of the corrugated pipe is low and even hard to harden are caused, the engineering practice is hard to meet the standard requirement, the sizing agent in the practical engineering cannot have good integral bonding effect, the rust resistance effect on the steel strand and the like are caused, and finally the long-term service of the bridge is influenced.
In order to solve the defects in grouting engineering application, the research focus of relevant scholars at home and abroad is to adopt a new material to improve the stability of fluidity, bleeding rate and the like of grouting materials, and the adopted additive has more types, higher price and poor economical efficiency of practical application.
Therefore, the grouting material for the prestressed duct of the highway bridge is provided, the stability of fluidity, bleeding rate and the like of the grouting material is improved under the condition of not increasing the cost of new materials, and the grouting material has important significance for the technical field of highway bridge construction.
Disclosure of Invention
The application aims to provide a road bridge prestressed duct grouting material, which solves the problems in the prior art, ensures the fluidity of the grouting material and reduces the loss of fluidity with time by re-doping sodium lignosulfonate and polycarboxylate water reducing agent, and plays a role in synergistic corrosion inhibition by re-doping sodium lignosulfonate and sodium metasilicate pentahydrate.
In order to achieve the above object, the present application provides the following solutions:
according to one of the technical schemes of the application, the highway bridge prestressed duct grouting material comprises the following raw materials in parts by weight: 48 to 58 parts of cement, 2 to 8 parts of fly ash, 2 to 8 parts of microbeads, 3 parts of expanding agent, 0.99 to 1.03 parts of water reducing agent, 0.02 to 0.06 part of sodium lignin sulfonate and 0.25 part of sodium metasilicate pentahydrate.
Determining the basic proportion of cement, fly ash, microbeads and a water reducing agent through orthogonal tests and extremely poor analysis results; on the basis of the proportion, sodium lignin sulfonate and sodium metasilicate pentahydrate are mixed, so that the performance index of the grouting material is further optimized, and the components and the proportion are as follows:
the raw materials comprise a matrix stabilizing component and a dynamic regulating component according to the parts by weight; the matrix stabilizing component comprises 50 parts of cement, 5 parts of fly ash, 5 parts of microbeads and 3 parts of expanding agent; the dynamic regulating and controlling components are 0.99-1.03 parts of water reducer, 0.02-0.06 parts of sodium lignin sulfonate and 0.25 parts of sodium metasilicate pentahydrate.
The doping amount of the sodium metasilicate pentahydrate is the optimal doping amount obtained by a single doping test; the dynamic regulation and control of the sodium lignin sulfonate is realized by a single doping test of the sodium lignin sulfonate, and the doping range is obtained according to the comprehensive properties (such as fluidity, strength, corrosion inhibition and the like) of the grouting material. Based on the above mixing amount range, different types of substitution tests are designed, and the mixing amounts of the two materials after optimization are obtained. The substitution test refers to the substitution of sodium lignin sulfonate for a different amount of polycarboxylate water reducer.
Further, the water-gel ratio of the highway bridge prestressed duct grouting material is 0.28.
Further, the expanding agent is a UEA expanding agent.
Further, the water reducer is a polycarboxylate water reducer.
The second technical scheme of the application is that the preparation method of the highway bridge prestressed duct grouting material comprises the following steps:
step 1, uniformly mixing raw materials including cement, fly ash, microbeads, an expanding agent, a water reducing agent, sodium lignin sulfonate and sodium metasilicate pentahydrate according to parts by weight to obtain a mixture;
and 2, weighing water according to a water-gel ratio of 0.28, adding the water into the mixture, and uniformly mixing to obtain the road bridge prestressed duct grouting material.
Further, the uniformly mixing manner in the step 1 is as follows: stirring for 1min at 500 r/min; the uniformly mixing mode in the step 2 is as follows: stirring at 1500r/min for 5min.
The third technical scheme of the application is the application of the highway bridge prestressed duct grouting material in highway bridge construction.
The technical conception of the application is as follows:
for the building field, the research on sodium lignin sulfonate in the prior art is mostly single performance research on the sodium lignin sulfonate as a water reducer, the synergistic effect of compounding sodium lignin sulfonate with additives such as the water reducer, a corrosion inhibitor and the like to form a multi-element system is not deeply researched, and the application research on cement products such as grouting materials and the like is less. According to the application, the sodium lignin sulfonate and the water reducing agent are mixed again, and the sodium lignin sulfonate and the sodium metasilicate pentahydrate are mixed again, so that the water reducing, adsorbing and corrosion inhibiting performances of the sodium lignin sulfonate are fully exerted, the fluidity, the time loss, the bleeding rate and the corrosion inhibiting performance of the grouting material are improved, and the multi-system prestressed duct grouting material with the sodium lignin sulfonate as a modified component is provided, so that the durability of a bridge is improved.
The application discloses the following technical effects:
(1) The application provides a highway bridge prestressed duct grouting material which has good fluidity, strength and other working performances, and solves the problems of large fluidity loss, low stability and weak corrosion inhibition of the traditional grouting material.
(2) According to the application, on the premise that the fluidity of the grouting material meets the standard requirement, the repeated blending of sodium lignin sulfonate and the polycarboxylate superplasticizer is utilized, the time loss of the fluidity is reduced, and the stability and the strength of the grouting material are improved. The application utilizes the complex doping of sodium lignin sulfonate and sodium metasilicate pentahydrate to exert a synergistic corrosion inhibition effect, so that the grouting material has better corrosion inhibition performance.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a view showing the rust resistance of the slurry for pre-stressing tunnels of highway bridges to steel strands prepared in example 1;
FIG. 2 is a view showing the rust resistance of the slurry for pre-stressing tunnels of highway bridges to steel strands prepared in example 2;
FIG. 3 is a view showing the rust resistance of the slurry for pre-stressing tunnels of highway bridges to steel strands prepared in example 3;
FIG. 4 is a view showing the rust resistance of the slurry for pre-stressing tunnels of highway bridges to steel strands prepared in example 4;
FIG. 5 is a view showing the rust resistance of the prestressed duct grouting material of the highway bridge prepared in comparative example 1 to the steel strand;
FIG. 6 is a view showing the rust resistance of the pre-stressed duct slurry of the highway bridge prepared in comparative example 2 to the steel strand;
fig. 7 is a rust resistance of the prestressed duct grouting material of the highway bridge prepared in comparative example 3 to the steel strand.
Detailed Description
Various exemplary embodiments of the application will now be described in detail, which should not be considered as limiting the application, but rather as more detailed descriptions of certain aspects, features and embodiments of the application.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the application. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the application described herein without departing from the scope or spirit of the application. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present application. The specification and examples of the present application are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
The "parts" in the present application are all parts by mass unless otherwise specified.
In the embodiment of the application, the sodium lignin sulfonate is in a powder form, the sodium metasilicate pentahydrate is in a granular form, the expanding agent is a UEA expanding agent, and the polycarboxylate water reducer is in a powder form.
The composition ratios of the prestressed duct grouting material for the highway bridge of examples 1 to 4 and comparative example 1 are shown in table 1.
Table 1 (Unit: portion)
| Cement and its preparation method | Fly ash | Microbeads | Expanding agent | Water reducing agent | Sodium lignin sulfonate | Sodium metasilicate pentahydrate | |
| Example 1 | 50 | 5 | 5 | 3 | 1.03 | 0.04 | 0.25 |
| Example 2 | 50 | 5 | 5 | 3 | 1.01 | 0.06 | 0.25 |
| Example 3 | 50 | 5 | 5 | 3 | 0.99 | 0.04 | 0.25 |
| Example 4 | 50 | 5 | 5 | 3 | 1.01 | 0.02 | 0.25 |
| Comparative example 1 | 50 | 5 | 5 | 3 | 1.07 | 0 | 0 |
| Comparative example 2 | 50 | 5 | 5 | 3 | 1.07 | 0 | 0.25 |
| Comparative example 3 | 50 | 5 | 5 | 3 | 1.03 | 0.04 | 0 |
In the above examples and comparative examples, the basic blending amount of the water reducing agent in examples 1, 2 and comparative examples 1 to 4 was 1.07, and in example 1, 0.04 sodium lignin sulfonate was used instead of 0.04 polycarboxylate water reducing agent, and in example 2, 0.06 sodium lignin sulfonate was used instead of 0.06 polycarboxylate water reducing agent. Comparative example 1 can be considered the most basic control for the entire test, i.e., neither sodium lignin sulfonate nor sodium metasilicate pentahydrate was added. In comparative example 2, only sodium metasilicate pentahydrate was added, and sodium lignin sulfonate was not added, so that the mixing amount of the water reducer was not changed, and was still 1.07. In comparative example 3, sodium lignin sulfonate alone, sodium metasilicate pentahydrate without being added, and a water reducing agent blending amount of 1.03 were used as a control group of example 1, and the effect of the double blending of sodium lignin sulfonate and sodium metasilicate pentahydrate was studied.
The weight of the corresponding components is weighed according to Table 1, poured into a stirring pot in turn, and stirred at a low speed of 500r/min for about 1min until the components are uniformly mixed. Further, weighing the corresponding water weight components according to the water-gel ratio of 0.28, pouring the water weight components into a stirring pot, stirring at a high speed of 1500r/min for 5min to obtain the prestressed duct grouting material of the highway bridge, and detecting the performance of the configured grouting material according to the technical Specification for construction of highway bridges (JTG/T3650-2020), wherein the detection results of all indexes are shown in Table 2.
TABLE 2
Note that: the sizing agent is used for measuring the content of oxygen elements obtained by analyzing the rust resistance index of the steel bar through the EDS surface of the steel strand surface; the index of the static deposition stability of the pressed slurry is measured by using a non-uniformity coefficient.
FIG. 1 is a view showing the rust resistance of the slurry for pre-stressing tunnels of highway bridges to steel strands prepared in example 1;
FIG. 2 is a view showing the rust resistance of the slurry for pre-stressing tunnels of highway bridges to steel strands prepared in example 2;
FIG. 3 is a view showing the rust resistance of the slurry for pre-stressing tunnels of highway bridges to steel strands prepared in example 3;
FIG. 4 is a view showing the rust resistance of the slurry for pre-stressing tunnels of highway bridges to steel strands prepared in example 4;
FIG. 5 is a view showing the rust resistance of the prestressed duct grouting material of the highway bridge prepared in comparative example 1 to the steel strand;
FIG. 6 is a view showing the rust resistance of the pre-stressed duct slurry of the highway bridge prepared in comparative example 2 to the steel strand;
fig. 7 is a rust resistance of the prestressed duct grouting material of the highway bridge prepared in comparative example 3 to the steel strand.
As can be seen from Table 2 and FIGS. 1-7, the grouting properties of examples 1-4 meet the specification. The addition of sodium lignin sulfonate and sodium metasilicate pentahydrate optimizes the performance of the grouting material, particularly has great improvement effect on the deposition stability, strength and rust resistance of steel strands of the grouting material, and has good economical efficiency compared with the current commercial grouting material products.
The above embodiments are only illustrative of the preferred embodiments of the present application and are not intended to limit the scope of the present application, and various modifications and improvements made by those skilled in the art to the technical solutions of the present application should fall within the protection scope defined by the claims of the present application without departing from the design spirit of the present application.
Claims (2)
1. The highway bridge prestressed duct grouting material is characterized by comprising, by mass, 50 parts of cement, 5 parts of fly ash, 5 parts of microbeads, 3 parts of expanding agent, 0.99-1.03 parts of water reducer, 0.02-0.06 part of sodium lignin sulfonate and 0.25 part of sodium metasilicate pentahydrate;
the water-gel ratio of the grouting material of the prestressed duct of the highway bridge is 0.28;
the expanding agent is a UEA expanding agent;
the water reducer is a polycarboxylate water reducer;
the preparation method of the highway bridge prestressed duct grouting material comprises the following steps:
step 1, uniformly mixing raw materials including cement, fly ash, microbeads, an expanding agent, a water reducing agent, sodium lignin sulfonate and sodium metasilicate pentahydrate according to parts by weight to obtain a mixture;
step 2, weighing water according to a water-gel ratio of 0.28, adding the water into the mixture, and uniformly mixing to obtain the road bridge prestressed duct grouting material;
the uniformly mixing mode in the step 1 is as follows: stirring for 1min at 500 r/min; the uniformly mixing mode in the step 2 is as follows: stirring at 1500r/min for 5min.
2. Use of the highway bridge prestressed duct grouting material according to claim 1 in highway bridge construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210942838.7A CN115432963B (en) | 2022-08-08 | 2022-08-08 | Grouting material for prestressed duct of highway bridge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210942838.7A CN115432963B (en) | 2022-08-08 | 2022-08-08 | Grouting material for prestressed duct of highway bridge |
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| CN115432963A CN115432963A (en) | 2022-12-06 |
| CN115432963B true CN115432963B (en) | 2023-11-17 |
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| CN115432963A (en) | 2022-12-06 |
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