CN114349402B - Super-strong high-toughness polyester concrete for structure restoration, preparation method and application - Google Patents
Super-strong high-toughness polyester concrete for structure restoration, preparation method and application Download PDFInfo
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- CN114349402B CN114349402B CN202111661037.5A CN202111661037A CN114349402B CN 114349402 B CN114349402 B CN 114349402B CN 202111661037 A CN202111661037 A CN 202111661037A CN 114349402 B CN114349402 B CN 114349402B
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- 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
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Abstract
The application discloses super-strong high-toughness polyester concrete for structure restoration, a preparation method and application. The super-strong high-toughness polyester concrete for structure restoration comprises raw materials of a component A, a component B and a component C; the component A is diphenylmethane diisocyanate MDI; b is polyester polyol; the component C comprises the following components in percentage by weight: 10 to 20 percent of cement, 10 to 20 percent of fly ash, 10 to 20 percent of ore powder and 50 to 70 percent of quartz sand. The invention has the characteristics of simple construction process, short construction period and low construction cost.
Description
Technical Field
The application relates to concrete, in particular to super-strong high-toughness polyester concrete for structure restoration, a preparation method and application.
Background
With the increase of heavy traffic volume and the improvement of vehicle load grade, under the harsh natural condition, the typical diseases of reinforcing steel bar corrosion, concrete crack, shedding and the like commonly exist in reinforcing steel bars and prestressed concrete structures under the action of various loads, so that extremely serious traffic safety hidden dangers exist.
At present, cement mortar or fine aggregate concrete and polymer modified composite materials are mostly adopted for repairing the local section of the conventional steel bar and prestressed concrete structure. However, a large number of investigation and research results show that the conventional concrete local section repairing technology mostly has a series of technical problems of self-crack of a repairing material, hollowing and falling after steel bar rust expansion and the like, and the using effect is poor.
Disclosure of Invention
It is an object of the present application to overcome the above problems or to at least partially solve or mitigate the above problems. Provides the super-strong high-toughness polyester concrete for repairing the structure, which is suitable for repairing the local section of a steel bar and prestressed concrete structure.
In order to solve the technical problems, the invention provides super-strong high-toughness polyester concrete for structure restoration, which comprises raw materials of a component A, a component B and a component C;
the component A is diphenylmethane diisocyanate MDI;
the B is polyester polyol;
the component C comprises the following components in percentage by weight:
10 to 20 percent of cement, 10 to 20 percent of fly ash, 10 to 20 percent of ore powder and 50 to 70 percent of quartz sand.
The mass ratio of the component A to the component B to the component C is 3-5.
The mass ratio of the component A to the component B to the component C is 4.
The polyester polyol is based on adipic acid, and the preparation method of the polyester polyol comprises the following steps:
(1) Putting 1, 4-butanediol, diethylene glycol and trimethylolpropane into a reaction kettle according to a certain molar ratio, and uniformly stirring;
(2) Then putting adipic acid and dodecanedioic acid into the reaction kettle according to a certain molar ratio;
(3) Stirring, heating the reaction system to 120-150 ℃, keeping the temperature of the reaction system at a constant temperature until water is discharged after the reaction system is a clear transparent liquid;
(4) Stirring and heating, controlling the water yield, and controlling the water outlet temperature at the top of the kettle not to exceed the distillation temperature of 100 ℃; after the temperature of the kettle reaches 225-255 ℃, keeping the temperature constant, vacuumizing to-0.8-0.9 MPa, keeping for 3-5 hours, detecting the hydroxyl value of the materials in the reaction kettle during vacuumizing, and stopping vacuumizing when the hydroxyl value is 200-800 mgkoh/g;
(5) Cooling the system to 50-60 ℃, adding a modifier, and uniformly stirring to obtain polyester polyol based on adipic acid;
the modifier comprises acetone, phosphate flame retardant and organic silicon defoamer;
the addition amount of the acetone is 15-25% of the weight of the polyester polyol;
the addition amount of the flame retardant is 2-7% of the weight of the polyester polyol 0 ；
The addition amount of the defoaming agent is 2 to 7 percent of the weight of the polyester polyol 0 。
The acetone is added to delay the solidification time of the polyester concrete, so that the construction operability is improved; adding a combustion improver: improving the fire resistance of the polyester concrete; the addition of the defoaming agent improves the compactness of the polyester concrete.
The molar ratio of the adipic acid to the dodecanedioic acid to the 1, 4-butanediol to the diethylene glycol to the trimethylolpropane is 5.474:0.434:2.441:7.539:0.745;
or, the molar ratio of the adipic acid, the dodecanedioic acid, the 1, 4-butanediol, the diethylene glycol and the trimethylolpropane is 4.790:0.434:11.096:1.885:0.745;
or, the molar ratio of the adipic acid, the dodecanedioic acid, the 1, 4-butanediol, the diethylene glycol and the trimethylolpropane is 5.474:0.434:2.219:9.432:0.745.
further, when vacuumizing, introducing nitrogen into the bottom of the reaction kettle, controlling the pressure of an input pipe for conveying the nitrogen to be 0.15-0.25MPa, and stopping introducing the nitrogen until the hydroxyl value of the materials in the reaction kettle is detected to be 200-800 mgkoh/g. The nitrogen is introduced to accelerate the discharge of the moisture and the free micromolecules in the system. Further removing small molecules generated by the polycondensation reaction, reducing the residual amount of the residual monomers and promoting the reaction.
The acid value of the polyester polyol is less than 1.50mgkoh/g, and the average molecular weight is 140-560.
The particle size screening cumulative weight of the quartz sand is as follows:
the invention also provides a preparation method of the super-strong high-toughness polyester concrete for structure restoration, which comprises the following steps:
(1) Weighing the component A, the component B and the component C according to the amount;
(2) Adding the component A into the component B, and pre-stirring for 3-5 minutes by adopting a drilling machine with the rotating speed not less than 1440 revolutions per minute to form an organic cementing agent material;
(3) Adding the component C into the organic cementing agent material prepared in the step 2), stirring again for 5-10 minutes by adopting a forced concrete stirrer, and fully mixing to obtain the super-strong high-toughness polyester concrete for structure restoration;
(4) And (3) pouring concrete on site, and naturally curing for 0.5-2 hours.
The invention also provides the application of the super-strong high-toughness polyester concrete for structure restoration in local section restoration of steel bars and prestressed concrete structures, reinforcement and reinforcement of concrete bearing structures, maintenance of concrete pavement of military and civil airports, maintenance and reinforcement of ultra-thin layer overlay and dam masonry concrete structures.
The invention overcomes the key technical problems of repairing the self-crack, hollowing, falling and the like of the reinforced material caused by corrosion and expansion of the steel bar in the conventional repairing reinforced material, takes isocyanate, polyester polyol and various modifiers as cementing agents, takes fine aggregates such as cement, fly ash, mineral powder, quartz sand and the like as reinforcing fillers, and produces the super-strong high-toughness composite material for repairing the steel bar and the prestressed concrete at normal temperature and normal pressure.
Detailed Description
The present application is further illustrated by the following specific examples:
example 1
Preparing raw materials according to the following weight percentage:
the component A is diphenylmethane diisocyanate MDI;
the component B is polyester polyol;
the component C comprises the following components in percentage by weight:
15% of cement, 15% of fly ash, 15% of mineral powder and 55% of quartz sand.
The mass ratio of the component A to the component B to the component C is 4.
The preparation method of the polyester polyol comprises the following steps:
according to the molar ratio of adipic acid, dodecanedioic acid, 1, 4-butanediol, diethylene glycol and trimethylolpropane being 5.474:0.434:2.441:7.539:0.745 preparing the raw material;
(1) Putting 1, 4-butanediol, diethylene glycol and trimethylolpropane into a reaction kettle according to the molar ratio, and uniformly stirring;
(2) Then putting adipic acid and dodecanedioic acid into the reaction kettle according to the molar ratio;
(3) Stirring to raise the temperature of the reaction system to 145 ℃, wherein the temperature raising speed is 20-25 ℃ per hour, the temperature of the reaction system is kept constant until water is discharged after the reaction system is a clear transparent liquid, and the top temperature of the reaction kettle is raised from 30 ℃ to 65 ℃;
(4) Stirring and heating, controlling the water yield, and controlling the water outlet temperature at the top of the kettle to be 85-98 ℃; after the temperature of the reaction kettle reaches 245 ℃, vacuumizing to-0.9 MPa in a constant temperature state, sampling and detecting the hydroxyl value of the material in the reaction kettle every 1-2 hours, and stopping vacuumizing when the measured hydroxyl value of the polyester polyol is 408 mgkoh/g; finally, it was found that the polyester polyol had a hydroxyl value of 408mgkoh/g, an acid value of 1.26mgkoh/g and an average molecular weight of 274.3.
(5) Reducing the temperature of kettle top water of a reaction system from 98 ℃ to 55 ℃, adding acetone, phosphate flame retardant and organic silicon defoamer, and uniformly stirring to obtain polyester polyol based on adipic acid; the addition amount of acetone is 20 percent of the weight of polyester polyol; the addition amount of the phosphate flame retardant is 5 percent of the weight of the polyester polyol 0 (ii) a The adding amount of the organic silicon defoamer is 5 percent of the weight of the polyester polyol 0 。
Wherein the organosilicon antifoaming agent is selected from antifoaming agent with model number GS-5411 provided by Shanghai Chengzi International trade company Limited.
The phosphate flame retardant is a flame retardant with the model of RF-107 provided by Qingdao union beauty chemical Co.
Wherein the particle size screening cumulative weight of the quartz sand is as follows:
the gradation of the quartz sand is determined through a gradation experiment, and the density and the void ratio of the quartz sand are the maximum and the void ratio of the quartz sand is the minimum. The quartz sand is beneficial to the mechanical property, durability and economy of the prepared super-strong high-toughness polyester concrete for repairing the structure.
The preparation method of the super-strong high-toughness polyester concrete for structure restoration comprises the following steps:
(1) Weighing the component A, the component B and the component C according to the amount;
(2) Adding the component A into the component B, and pre-stirring for 4 minutes by adopting a drilling machine with the rotating speed of 1440 revolutions per minute to form an organic cementing agent material;
(3) Adding the component C into the organic cementing agent material prepared in the step 2), stirring again for 8 minutes by adopting a forced concrete stirrer, and fully mixing to obtain concrete slurry;
(4) And pouring concrete grout on site onto the to-be-repaired runway surface of the airport concrete, and naturally curing for 2 hours.
Example 2
Preparing the following raw materials in percentage by weight:
the component A is diphenylmethane diisocyanate MDI;
the component B is polyester polyol;
the component C comprises the following components in percentage by weight:
10% of cement, 20% of fly ash, 10% of ore powder and 60% of quartz sand.
The mass ratio of the component A to the component B to the component C is 3.
The preparation method of the polyester polyol comprises the following steps:
according to the molar ratio of adipic acid, dodecanedioic acid, 1, 4-butanediol, diethylene glycol and trimethylolpropane of 4.790:0.434:11.096:1.885:0.745 preparing raw materials;
(1) Putting 1, 4-butanediol, diethylene glycol and trimethylolpropane into a reaction kettle according to the molar ratio, and uniformly stirring;
(2) Then putting adipic acid and dodecanedioic acid into the reaction kettle according to the molar ratio;
(3) Stirring to raise the temperature of the reaction system to 120 ℃, wherein the temperature raising speed is 20-25 ℃ per hour, and the reaction system is in a clear transparent liquid state and then is kept at the constant temperature until water is discharged;
(4) Then stirring and heating, controlling the water yield, and controlling the water outlet temperature at the top of the kettle to be 85-98 ℃; after the temperature of the kettle reaches 225 ℃, vacuumizing to-0.8 MPa in a constant temperature state; sampling every 40 minutes to detect the hydroxyl value of the material in the reaction kettle, and stopping vacuumizing when the hydroxyl value of the polyester polyol is 590 mgkoh/g; finally, it was found that the acid value of the polyester polyol was 0.98mgkoh/g and the average molecular weight was 189.9.
(5) Reducing the temperature of kettle top water outlet of a reaction system from 98 ℃ to 50 ℃, adding acetone, phosphate flame retardant and organic silicon defoamer, and uniformly stirring to obtain polyester polyol based on adipic acid; the addition amount of acetone is 25 percent of the weight of polyester polyol; the addition amount of the phosphate flame retardant is 2 percent of the weight of the polyester polyol 0 (ii) a The addition amount of the organic silicon defoamer is 3 percent of the weight of the polyester polyol 0 。
Wherein the particle size screening cumulative weight of the quartz sand is as follows:
the preparation method of the super-strong high-toughness polyester concrete for structure restoration comprises the following steps:
(1) Weighing the component A, the component B and the component C according to the amount;
(2) Adding the component A into the component B, and pre-stirring for 3 minutes by adopting a drilling machine with the rotating speed of 1440 revolutions per minute to form an organic cementing agent material;
(3) Adding the component C into the organic cementing agent material prepared in the step 2), stirring again for 10 minutes by adopting a forced concrete stirrer, and fully mixing to obtain concrete slurry;
(4) And (3) pouring concrete grout on site onto the local section of the existing concrete structure, and naturally curing for 2 hours.
Example 3
Preparing raw materials according to the following weight percentage:
the component A is diphenylmethane diisocyanate MDI;
the component B is polyester polyol;
the component C comprises the following components in percentage by weight:
20% of cement, 10% of fly ash, 20% of ore powder and 50% of quartz sand.
The mass ratio of the component A to the component B to the component C is 5.
The preparation method of the polyester polyol comprises the following steps:
according to the molar ratio of adipic acid, dodecanedioic acid, 1, 4-butanediol, diethylene glycol and trimethylolpropane being 5.474:0.434:2.219:9.432:0.745 preparing the raw material;
(1) Putting 1, 4-butanediol, diethylene glycol and trimethylolpropane into a reaction kettle according to the molar ratio, and uniformly stirring;
(2) Then putting adipic acid and dodecanedioic acid into the reaction kettle according to the molar ratio;
(3) Stirring to raise the temperature of the reaction system to 150 ℃, wherein the temperature raising speed is 20-25 ℃ per hour, and the temperature of the system is kept constant until water is discharged after the system is a clear transparent liquid;
(4) Stirring and heating, controlling the water yield, and controlling the water outlet temperature at the top of the kettle to be 85-98 ℃; after the temperature of the reaction kettle reaches 255 ℃, vacuumizing to-0.8 MPa under a constant temperature state, introducing nitrogen into the bottom of the reaction kettle, controlling the pressure of an input pipe for conveying the nitrogen to be 0.2MPa, sampling and detecting the hydroxyl value of the material in the reaction kettle every 20 minutes, and stopping vacuumizing when the detected hydroxyl value of the polyester polyol is 231 mgkoh/g; finally, it was found that the acid value of the polyester polyol was 0.98mgkoh/g and the average molecular weight was 482.8.
(5) Reducing the temperature of kettle top water of a reaction system from 98 ℃ to 60 ℃, adding acetone, phosphate flame retardant and organic silicon defoamer, and uniformly stirring to obtain polyester polyol based on adipic acid; the addition amount of acetone is 15 percent of the weight of polyester polyol; the addition amount of the phosphate flame retardant is 7 percent of the weight of the polyester polyol 0 (ii) a The adding amount of the organic silicon defoamer is 7 percent of the weight of the polyester polyol 0 。
Wherein the particle size screening cumulative weight of the quartz sand is as follows:
the preparation method of the super-strong high-toughness polyester concrete for structural repair comprises the following steps:
(1) Weighing the component A, the component B and the component C according to the amount;
(2) Adding the component A into the component B, and pre-stirring for 5 minutes by adopting a drilling machine with the rotating speed of 1440 revolutions per minute to form an organic cementing agent material;
(3) Adding the component C into the organic cementing agent material prepared in the step 2), stirring again for 5 minutes by adopting a forced concrete stirrer, and fully mixing to obtain concrete slurry;
(4) And (3) pouring concrete slurry on site onto the masonry concrete structure of the dam, and naturally curing for 2 hours.
Example 4
Preparing raw materials according to the following weight percentage:
the component A is diphenylmethane diisocyanate MDI;
the component B is polyester polyol;
the component C comprises the following components in percentage by weight:
10% of cement, 10% of fly ash, 10% of ore powder and 70% of quartz sand.
The mass ratio of the component A to the component B to the component C is 4.
The preparation method of the polyester polyol comprises the following steps:
according to the molar ratio of adipic acid, dodecanedioic acid, 1, 4-butanediol, diethylene glycol and trimethylolpropane being 5.474:0.434:2.441:7.539:0.745 preparing raw materials;
(1) Adding 1, 4-butanediol, diethylene glycol and trimethylolpropane into a reaction kettle according to the molar ratio, and uniformly stirring;
(2) Then putting adipic acid and dodecanedioic acid into the reaction kettle according to the molar ratio;
(3) Stirring to raise the temperature of the reaction system to 130 ℃, wherein the temperature raising speed is 20-25 ℃ per hour, and the temperature of the system is kept constant until water is discharged after the system is a clear transparent liquid;
(4) Stirring and heating, controlling the water yield, and controlling the water outlet temperature at the top of the kettle not to exceed the distillation temperature of 100 ℃; after the temperature of the kettle reaches 235 ℃, vacuumizing to-0.8 MPa in a constant temperature state, sampling every 1 hour to detect the hydroxyl value of the material in the reaction kettle, and stopping vacuumizing when the hydroxyl value of the polyester polyol is 408 mgkoh/g; finally, it was found that the polyester polyol had a hydroxyl value of 408mgkoh/g, an acid value of 1.26mgkoh/g and an average molecular weight of 274.3.
(5) Reducing the temperature of kettle top water outlet of a reaction system from 98 ℃ to 55 ℃, adding a modifier acetone, a phosphate flame retardant and an organic silicon defoamer, and uniformly stirring to obtain polyester polyol based on adipic acid; the addition amount of acetone is 18 percent of the weight of polyester polyol; the addition amount of the phosphate flame retardant is 4 percent of the weight of the polyester polyol 0 (ii) a The adding amount of the organic silicon defoamer is 5 percent of the weight of the polyester polyol 0 。
Wherein the particle size screening cumulative weight of the quartz sand is as follows:
the preparation method of the super-strong high-toughness polyester concrete for structural repair comprises the following steps:
(1) Weighing the component A, the component B and the component C according to the amount;
(2) Adding the component A into the component B, and pre-stirring for 5 minutes by adopting a drilling machine with the rotating speed of 1440 revolutions per minute to form an organic cementing agent material;
(3) Adding the component C into the organic cementing agent material prepared in the step 2), stirring again for 8 minutes by adopting a forced concrete stirrer, and fully mixing to obtain concrete slurry;
(4) And (3) pouring concrete grout on site onto the local sections of the steel bars and the prestressed concrete structure, and naturally curing for 2 hours.
The mechanical properties of the high-strength elastic concrete of the invention are shown in Table 1
As can be seen from table 1 test data of the present invention, the present invention has the following advantages:
(1) The tensile strength of the C60 concrete is about 5MPa, and the strength of the concrete is more than ten times that of the C60 concrete, which shows that the concrete has high strength;
(2) The ultimate tensile strain and the ultimate compressive strain of the C60 concrete are respectively about 125 mu epsilon and 1500 mu epsilon, and the ultimate tensile strain and the ultimate compressive strain of the concrete are respectively 6 times more and about 2.8 times more than those of the concrete, so that the concrete has good toughness;
(3) The bonding strength between the novel high-strength concrete and concrete is 3.2MPa, which is far greater than the technical requirement of not less than 2.5MPa specified by national concrete structure reinforcement design specifications, and the novel high-strength concrete can ensure that the interfaces of new and old materials are not damaged. Indicating good bonding characteristics between the patented product and the concrete.
(4) The technical indexes of the invention for resisting seepage, freezing and chloride ion permeation all reach the upper limit value specified by the national design specification of reinforcing steel bars and prestressed concrete bridges, and the patent product has good durability.
The high-strength elastic concrete is used for carrying out thin-layer cover covering on concrete pavement of super-large urban expressways and military and civil airports, so that the bearing capacity of the active concrete pavement is practically improved, the service technical index of the active airport pavement can be effectively improved, the service life of an original structure is prolonged, and good social and economic benefits are achieved.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which this application belongs.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. The super-strong high-toughness polyester concrete for structural repair is characterized by comprising raw materials of a component A, a component B and a component C;
the component A is diphenylmethane diisocyanate MDI;
the component B is polyester polyol;
the component C comprises the following components in percentage by weight:
10 to 20 percent of cement, 10 to 20 percent of fly ash, 10 to 20 percent of ore powder and 50 to 70 percent of quartz sand; the mass ratio of the component A to the component B to the component C is 3-5;
the particle size screening cumulative weight of the quartz sand is as follows:
more than 0% of 2.0mm
2.0-1.6mm 7-12%
1.6-1.0mm： 28-38%
1.0-0.5mm： 62-72%
0.5-0.16mm： 82-92%
0.18-0.08mm： 98-99%
0.08-0.00mm： 100％；
The polyester polyol is based on adipic acid, and the preparation method of the polyester polyol comprises the following steps:
(1) Putting 1, 4-butanediol, diethylene glycol and trimethylolpropane into a reaction kettle according to a certain molar ratio, and uniformly stirring;
(2) Then putting adipic acid and dodecanedioic acid into the reaction kettle according to a certain molar ratio;
the molar ratio of adipic acid, dodecanedioic acid, 1, 4-butanediol, diethylene glycol and trimethylolpropane is 5.474:0.434:2.441:7.539:0.745;
or, the molar ratio of the adipic acid, the dodecanedioic acid, the 1, 4-butanediol, the diethylene glycol and the trimethylolpropane is 4.790:0.434:11.096:1.885:0.745;
or, the molar ratio of the adipic acid, the dodecanedioic acid, the 1, 4-butanediol, the diethylene glycol and the trimethylolpropane is 5.474:0.434:2.219:9.432:0.745;
(3) Stirring, heating the reaction system to 120-150 ℃, keeping the temperature of the reaction system at a clear transparent liquid, and then discharging water;
(4) Stirring and heating, controlling the water yield, and controlling the water outlet temperature at the top of the kettle not to exceed the distillation temperature of 100 ℃; after the temperature of the reaction kettle reaches 225-255 ℃, keeping the temperature constant, vacuumizing to-0.8-0.9 MPa, detecting the hydroxyl value of the material in the reaction kettle during vacuumizing, and stopping vacuumizing when the hydroxyl value is 200-800 mg KOH/g;
(5) Cooling the system to 50-60 ℃, adding a modifier, and uniformly stirring to obtain polyester polyol based on adipic acid;
the acid value of the polyester polyol is less than 1.50mg KOH/g, and the average molecular weight is 140-560;
the modifier is acetone, phosphate flame retardant and organic silicon defoamer;
the addition amount of the acetone is 15-25% of the weight of the polyester polyol;
the addition amount of the flame retardant is 2-7% of the weight of the polyester polyol 0 ；
The addition amount of the defoaming agent is 2 to 7 percent of the weight of the polyester polyol 0 。
2. Superstrong high tenacity polyester concrete for structural rehabilitation according to claim 1, characterized in that the mass ratio of the a-component, the B-component and the C-component is 4.
3. The super-strong high-toughness polyester concrete for structural restoration according to claim 1 or 2, wherein when the vacuum is pumped, nitrogen is introduced into the bottom of the reaction kettle, the pressure of an input pipe for conveying the nitrogen is controlled to be 0.15-0.25MPa, and the introduction of the nitrogen is stopped until the hydroxyl value of the material in the reaction kettle is detected to be 200-800 mg KOH/g.
4. The method for preparing super strong high tenacity polyester concrete for structure restoration according to any one of claims 1 to 3, characterized by comprising the steps of:
(1) Weighing the component A, the component B and the component C according to the amount;
(2) Adding the component A into the component B, and pre-stirring for 3-5 minutes by adopting a drilling machine with the rotating speed not less than 1440 revolutions per minute to form an organic cementing agent material;
(3) And (3) adding the component C into the organic cementing agent material prepared in the step (2), stirring again for 5-10 minutes by using a forced concrete stirrer, and fully mixing to obtain the super-strong high-toughness polyester concrete for structure restoration.
5. Use of the super high toughness polyester concrete for structural restoration according to any one of claims 1 to 3 for local cross-sectional restoration of reinforced and prestressed concrete structures, reinforcement of concrete load-bearing structures, maintenance of concrete pavement in civil and military airports, maintenance and reinforcement of ultra-thin layer covers, and maintenance and reinforcement of dam masonry concrete structures.
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| CN104829177B (en) * | 2015-04-21 | 2017-04-19 | 北京中科嘉固建筑材料科技有限公司 | High strength crack resistant concrete and preparation method, composition and application thereof |
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