CN111732385A - Waste rubber concrete for suspension tunnel pipe section and preparation method thereof - Google Patents
Waste rubber concrete for suspension tunnel pipe section and preparation method thereof Download PDFInfo
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- CN111732385A CN111732385A CN202010576246.9A CN202010576246A CN111732385A CN 111732385 A CN111732385 A CN 111732385A CN 202010576246 A CN202010576246 A CN 202010576246A CN 111732385 A CN111732385 A CN 111732385A
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/18—Waste materials; Refuse organic
- C04B18/20—Waste materials; Refuse organic from macromolecular compounds
- C04B18/22—Rubber, e.g. ground waste tires
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1051—Organo-metallic compounds; Organo-silicon compounds, e.g. bentone
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
-
- 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
- C04B2111/56—Compositions suited for fabrication of pipes, e.g. by centrifugal casting, or for coating concrete pipes
-
- 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
Abstract
The application discloses waste rubber concrete for a suspended tunnel pipe section and a preparation method thereof, wherein each cubic meter of concrete raw materials comprise: 300-400 kg of Portland cement, 50-100 kg of granulated blast furnace slag powder, 30-80 kg of fly ash, 10-30 kg of silica fume, 60-100 kg of rubber particles, 0.5-2 kg of first modifier, 0.5-2 kg of second modifier, 500-540 kg of fine aggregate, 1000-1100 kg of coarse aggregate, 4-6 kg of high-performance water reducer and 125-150 kg of mixing water. The preparation method comprises the following steps: weighing a first modifier, fully dissolving the first modifier in water, and uniformly stirring rubber particles and the first modifier solution; weighing cement, granulated blast furnace slag powder, fly ash, silica fume and rubber particles treated by a first modifier; weighing part of the mixing water and uniformly stirring; weighing the rest mixing water, the fine aggregate, the coarse aggregate and the second modifier, and uniformly stirring; and (5) placing the mixture into a test mold for vibration molding. The application provides a concrete for suspension tunnel can satisfy workability, compressive strength, toughness and shock resistance requirement.
Description
Technical Field
The application belongs to the technical field of concrete materials, and particularly relates to waste rubber concrete for a suspended tunnel pipe section and a preparation method of the waste rubber concrete.
Background
Floating tunnels in water are receiving increasing attention from governments and researchers in various countries as a new type of traffic structure for crossing straits, bays, lakes and other waterways. The floating tunnel can cross different waters such as rivers, fjords, straits, lakes and the like, and provides a possible or acceptable fixed crossing structure form for the places which are considered not to be crossed due to the consideration of deep water or the distance between two banks. The suspension tunnel can bear the tests of ocean dynamic load, sudden load and sudden impact of foreign objects, and has good bending resistance, impact resistance and durability.
Concrete, one of the most used materials for building construction, suffers from problems of high brittleness, insufficient toughness, shortage of raw material resources and the like. Meanwhile, with the continuous increase of the automobile holding capacity in China, the production amount of waste tires in China is increasing day by day, a large amount of waste rubber cannot be effectively treated, and serious burden and adverse effect are caused to the environment in China. Therefore, the rubber is used as the concrete aggregate, thereby achieving two purposes, and solving the difficult problem of shortage of concrete raw materials and the difficult problem of waste treatment of the rubber. In addition, the rubber is a high-elasticity polymer material with reversible deformation, has elasticity at room temperature, can generate large deformation under the action of small force, and is a high-deformation toughness material. The performances of concrete such as earthquake resistance and impact resistance can be improved by adding rubber into concrete, but the working performance and the concrete strength are reduced rapidly after adding the rubber into the concrete, the interface bonding strength of the rubber and a cement matrix is low, certain technical problems also exist, research needs to be carried out to improve the performance of the rubber concrete, and high-performance rubber concrete is prepared to meet the requirement of materials for suspended tunnel pipe sections.
Disclosure of Invention
Aiming at the defects or shortcomings of the prior art, the technical problem to be solved by the application is to provide the waste rubber concrete for the suspended tunnel pipe section and the preparation method.
In order to solve the technical problem, the application is realized by the following technical scheme:
the application provides a suspension tunnel pipe section is with abandonment rubber concrete, and per cubic meter concrete raw materials includes following component:
300-400 kg of Portland cement,
50-100 kg of granulated blast furnace slag powder,
30-80 kg of fly ash,
10-30 kg of silica fume,
60-100 kg of rubber particles,
0.5-2 kg of the first modifier,
0.5 to 2kg of a second modifier,
500-540 kg of fine aggregate,
1000-1100 kg of coarse aggregate,
4-6 kg of high-performance water reducing agent,
and 125-150 kg of mixing water.
Further, the waste rubber concrete for the suspended tunnel pipe section is characterized in that the strength grade of the portland cement is not lower than 42.5. Preferably, the portland cement is type ii portland cement having a cement strength grade of 52.5.
Further, the waste rubber concrete for the suspension tunnel pipe section is characterized in that the granulated blast furnace slag powder is granulated blast furnace slag powder with the grade not lower than S95. The granulated blast furnace slag powder can be used as a concrete mineral admixture, has higher activity and filling effect, can improve the strength and durability of concrete, and can effectively reduce the slump loss of the concrete.
Further, the waste rubber concrete for the suspension tunnel pipe section is characterized in that the fly ash is I-grade or II-grade fly ash. The fly ash has the characteristics of high activity, corrosion resistance, high compressive strength, good fluidity, no toxicity and the like, can improve the workability of concrete, improve the performances of compactness, durability, corrosion resistance and the like of the concrete, reduce the water consumption of the concrete and effectively improve the strength of the concrete. Preferably, the fly ash is I-grade fly ash.
Further, the waste rubber concrete for the suspended tunnel pipe section is characterized in that the specific surface area of the silica fume is more than 18000m2Activity index per kg, 28 days, is greater than 95%. The silica fume can be used as a mineral admixture for concrete. The silica fume belongs to an ultrafine mineral admixture, has higher activity and filling performance, and improves the strength and durability of concrete.
Further, the waste rubber concrete for the suspension tunnel pipe section is characterized in that the particle size of the rubber particles is 3-6 mm. In the application, rubber particles are adopted to replace part of fine aggregate in concrete, so that the brittleness of the concrete is improved, and the bending resistance and the impact resistance of the concrete are improved.
Further, the waste rubber concrete for the suspended tunnel pipe section is characterized in that the first modifier is a rubber-reinforced concreteIs a silane coupling agent KH-550, and the mixing amount of the first modifier is 0.5-2 kg/m3The second modifier is a titanate coupling agent CS-311, and the second modifier is 0.5-2 kg/m3. The first modifier and the second modifier can improve the bonding strength between the rubber particles and the concrete matrix, fully exert the performance of the rubber particles, increase the toughness of the concrete and improve the impact resistance of the concrete.
Further, the waste rubber concrete for the suspended tunnel pipe section is characterized in that the fineness modulus of the fine aggregate is 2.3-2.8, the mud content is not more than 1.5%, the mud block content is not more than 0.5%, and the content of fine particles with the particle size of less than 0.15mm is not less than 5%; the maximum particle size of the coarse aggregate is not more than 25mm, the coarse aggregate is 5-25mm continuous gradation, the content of needle sheets is not more than 10%, the content of mud is not more than 0.7%, and the content of mud blocks is not more than 0.2%.
Further, the waste rubber concrete for the suspension tunnel pipe section is characterized in that the water reducing rate of the high-performance water reducing agent is more than 28%. The high-performance water reducing agent with the water reducing rate of more than 28 percent is compounded with the granulated blast furnace slag powder, the fly ash, the silica fume and the rubber, so that the workability and the compressive strength of the concrete are improved.
The application also provides a preparation method of the waste rubber concrete for the suspension tunnel pipe section, which comprises the following steps:
weighing a first modifier according to the mass ratio of the first modifier to the rubber particles, fully dissolving the first modifier in water at 70-80 ℃, uniformly stirring the rubber particles and the solution of the first modifier, and placing the mixture in a dry environment until the surfaces of the rubber particles are completely dried;
weighing cement, granulated blast furnace slag powder, fly ash, silica fume and rubber particles treated by the first modifier according to the proportion; weighing part of mixing water; and stirring uniformly; preferably, weighing the cement, the granulated blast furnace slag powder, the fly ash, the silica fume and the rubber particles treated by the first modifier according to the proportion; 1/3 mixing water is weighed; and putting the mixture into a stirring pot to be uniformly stirred for 60 s;
weighing the rest mixing water, the fine aggregate, the coarse aggregate and the second modifier according to the proportion, and putting the mixture into a stirring pot for uniformly stirring; preferably, the rest water, the fine aggregate, the coarse aggregate and the second modifier are weighed according to the proportion and are put into a stirring pot to be stirred for 120s until the mixture is uniform;
and (3) filling the uniformly stirred modified rubber concrete into a test mold, vibrating and molding, and testing after a specified age.
Compared with the prior art, the method has the following technical effects:
the application further comprehensively considers the aspects of workability, compressive strength, shrinkage, bending toughness, impact resistance, durability and the like of the concrete, and provides an optimal mixing proportion of the concrete for the suspension tunnel, namely the water-cement ratio of the concrete is 0.24-0.35; the dosage of the cementing material is not more than 500kg/m3(ii) a The mixing amount of the rubber particles is 60-100 kg/m3. The water-cement ratio is 0.24-0.35, so that the workability of the concrete can be met, and the compressive strength of the concrete can be ensured. Although the strength of the concrete can be improved to a certain extent by increasing the dosage of the cementing material, the higher dosage of the cementing material can cause the shrinkage of the concrete to be increased, the concrete to be cracked is caused, the durability of the concrete is greatly reduced, the elastic modulus of the concrete is reduced by the higher dosage of the cementing material, and the dosage of the concrete cementing material is preferably controlled to be not more than 500kg/m3. The rubber particles are adopted to improve the brittleness of the concrete and improve the bending toughness and the shock resistance of the concrete. Two modifiers are adopted to improve the interface bonding of the rubber particles and a cement matrix, the effect of the rubber particles in concrete is fully exerted, the first modifier is a silane coupling agent KH-550, the combination of the rubber particles and silicon elements in the matrix such as cement can be realized, the combination of the first modifier and the silicon elements in the cement, mineral powder, fly ash, silica fume and the like can be ensured, and the bonding of the rubber particles and the matrix is improved; the second modifier is titanate coupling agent CS-311, which can combine rubber particles with various elements in the concrete matrix, thereby forming a structure of a rubber particle-coupling agent-matrix combination layer and improving the performance of rubber concrete.
The suspension tunnel concrete is plastic concrete and flowable concrete, the workability of the suspension tunnel concrete is controlled by slump, and the preferable slump is controlled to be 10-150 mm.
Detailed Description
The conception, specific structure, and technical effects of the present application will be further described below to fully understand the purpose, features, and effects of the present application.
Raw materials of the present example
(1) Cement: strength grade 52.5 type ii portland cement.
(2) Slag powder: s95 granulating the blast furnace slag powder.
(3) Fly ash: class I fly ash.
(4) Silica fume: the specific surface area is 18500m2Activity index at 28 days was 96% per kg.
(5) Rubber particles:
(6) fine aggregate (sand): the medium sand with fineness modulus of 2.5 contains 0.5% of mud and 0.2% of mud blocks.
(7) Coarse aggregate (stone): 5-25mm continuous graded broken stone, the mud content is 0.3%, and the mud block content is 0.1%.
(8) First modifier: a silane coupling agent KH-550.
(9) A second modifier: titanate coupling agent C S-311.
(10) Water reducing agent: GTS-413 polycarboxylic acid high-performance water reducing agent of Shanghai high-iron chemistry Limited.
(11) Mixing water: city tap water is adopted.
Test method of the present example
(1) Workability and compressive strength
Concrete workability and compressive strength tests were carried out according to the regulations of the technical test for concrete for water transport engineering (JTS-T236-2019).
(2) Bending resistance
The 100X 515mm trabeculae are formed, the bending-resistant total curve of the notched beam is respectively tested after the midspan notch is cut with the depth of 5cm and the age of 28 days, and a 1000kN microcomputer-controlled electro-hydraulic servo universal tester produced by Shenzhen Sansi longitudinal and transverse science and technology Limited is adopted to carry out the three-point bending-resistant total curve.
(3) Impact resistance
A trabecula with the thickness of 100 multiplied by 400mm is formed, and a concrete impact resistance test is carried out by adopting a DTM1000 drop hammer impact tester produced by Shenzhen Sansi longitudinal and transverse science and technology Limited.
(4) Durability
The concrete electric flux test is carried out according to the relevant regulations of the Standard test methods for the Long-term Performance and durability of ordinary concrete (GB/T50082-2009).
The curing method adopted in this embodiment is as follows: the curing temperature is 18-22 ℃, and the curing humidity is more than 95%.
Concrete mix proportion of this example
The compounding ratio of the various embodiments of the waste rubber concrete for the suspended tunnel pipe section of the present application is shown in table 1.
TABLE 1 concrete mix proportion (kg/m)3)
The properties of examples A0, A1, A2, A3, A4 and A5 of Table 1 above were tested
(1) Workability and compressive strength
The workability and compressive strength test results for the concrete of each of the above examples are shown in table 2.
TABLE 2 concrete workability and compressive Strength test results
| Numbering | Slump (mm) | 28d compressive Strength (MPa) |
| A0 | 130 | 64.8 |
| A1 | 120 | 60.2 |
| A2 | 120 | 65.1 |
| A3 | 130 | 63.3 |
| A4 | 125 | 64.5 |
| A5 | 120 | 61.0 |
The test results in the table 2 show that the slump of the rubber concrete is equivalent to that of the reference concrete, and the concrete construction requirements are met; the 28d compressive strength of the rubber concrete is more than 54MPa, is equivalent to that of the standard concrete, can meet the preparation strength requirement of C50 concrete, and meets the requirement of the compressive strength of the suspension tunnel.
(2) Bending resistance
According to the bending resistance full curve of the tested notched beam and relevant documents, the fracture energy, peak load and ductility index of concrete are respectively calculated, and the test results are shown in table 3.
TABLE 3 test results for fracture energy, peak load and ductility index of concrete
| Numbering | Breaking energy (N/m) | Peak load (kN) | Ductility index (1/m) |
| A0 | 158.1 | 4.995 | 0.0317 |
| A1 | 278.8 | 4.785 | 0.0583 |
| A2 | 270.1 | 5.118 | 0.0528 |
| A3 | 271.3 | 5.012 | 0.0541 |
| A4 | 272.4 | 4.915 | 0.0554 |
| A5 | 275.1 | 4.812 | 0.0572 |
As can be seen from the test results in Table 3, the fracture energy and ductility index of the rubber concrete are significantly higher than those of the concrete without rubber, and the rubber concrete has higher fracture energy and ductility index and good toughness.
The application further comprehensively considers the aspects of workability, compressive strength, shrinkage, bending toughness, impact resistance, durability and the like of the concrete, and provides an optimal mixing proportion of the concrete for the suspension tunnel, namely the water-cement ratio of the concrete is 0.24-0.35; the dosage of the cementing material is not more than 500kg/m3(ii) a The mixing amount of the rubber particles is 60-100 kg/m3. The water-cement ratio is 0.24-0.35, so that the workability of the concrete can be met, and the compressive strength of the concrete can be ensured. Although the strength of the concrete can be improved to a certain extent by increasing the dosage of the cementing material, the higher dosage of the cementing material can cause the shrinkage of the concrete to be increased, the concrete to be cracked is caused, the durability of the concrete is greatly reduced, the elastic modulus of the concrete is reduced by the higher dosage of the cementing material, and the dosage of the concrete cementing material is preferably controlled to be not more than 500kg/m3. The rubber particles are adopted to improve the brittleness of the concrete and improve the bending toughness and the shock resistance of the concrete. Two modifiers are adopted to improve the interface bonding of the rubber particles and a cement matrix, the effect of the rubber particles in concrete is fully exerted, the first modifier is a silane coupling agent KH-550, the combination of the rubber particles and silicon elements in the matrix such as cement can be realized, the combination of the first modifier and the silicon elements in the cement, mineral powder, fly ash, silica fume and the like can be ensured, and the bonding of the rubber particles and the matrix is improved; the second modifier is titanate coupling agent CS-311, which can combine rubber particles with various elements in the concrete matrix, thereby forming a structure of a rubber particle-coupling agent-matrix combination layer and improving the performance of rubber concrete.
The above embodiments are merely to illustrate the technical solutions of the present application and are not limitative, and the present application is described in detail with reference to preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made in the present invention without departing from the spirit and scope of the present invention and shall be covered by the appended claims.
Claims (10)
1. The waste rubber concrete for the suspended tunnel pipe section is characterized in that each cubic meter of concrete raw material comprises the following components:
300-400 kg of Portland cement,
50-100 kg of granulated blast furnace slag powder,
30-80 kg of fly ash,
10-30 kg of silica fume,
60-100 kg of rubber particles,
0.5 to 2kg of a first modifier,
0.5 to 2kg of a second modifier,
500-540 kg of fine aggregate,
1000-1100 kg of coarse aggregate,
4-6 kg of high-performance water reducing agent,
and 125-150 kg of mixing water.
2. The waste rubber concrete for a suspended tunnel pipe section according to claim 1, wherein the strength grade of the portland cement is not lower than 42.5.
3. The waste rubber concrete for the suspension tunnel pipe section as claimed in claim 1, wherein the granulated blast furnace slag powder is granulated blast furnace slag powder with a grade of not less than S95.
4. The waste rubber concrete for the suspended tunnel pipe section as claimed in claim 1, wherein the fly ash is class I or class II fly ash.
5. The waste rubber concrete for the suspension tunnel pipe section according to claim 1, wherein the silica fume has a specific surface area of more than 18000m2Activity index per kg, 28 days, is greater than 95%.
6. The waste rubber concrete for the suspension tunnel pipe section according to claim 1, wherein the rubber particles have a particle size of 3-6 mm.
7. The waste rubber concrete for the suspension tunnel pipe section according to any one of claims 1 to 6, wherein the first modifier is a silane coupling agent KH-550, and the mixing amount of the first modifier is 0.5 to 2kg/m3The second modifier is a titanate coupling agent CS-311, and the second modifier is 0.5-2 kg/m3。
8. The waste rubber concrete for the suspended tunnel pipe section as claimed in any one of claims 1 to 6, wherein the fineness modulus of the fine aggregate is 2.3 to 2.8, the mud content is not more than 1.5%, the mud cake content is not more than 0.5%, and the content of fine particles below 0.15mm is not less than 5%; the maximum particle size of the coarse aggregate is not more than 25mm, the coarse aggregate is 5-25mm continuous gradation, the content of needle sheets is not more than 10%, the content of mud is not more than 0.7%, and the content of mud blocks is not more than 0.2%.
9. The waste rubber concrete for the suspension tunnel pipe section according to any one of claims 1 to 6, wherein the water reducing rate of the high performance water reducing agent is more than 28%.
10. The method for preparing the waste rubber concrete for the suspended tunnel pipe section according to any one of claims 1 to 9, comprising the steps of:
weighing a first modifier according to the mass ratio of the first modifier to the rubber particles, fully dissolving the first modifier in water at 70-80 ℃, uniformly stirring the rubber particles and the solution of the first modifier, and placing the mixture in a dry environment until the surfaces of the rubber particles are completely dried;
weighing cement, granulated blast furnace slag powder, fly ash, silica fume and rubber particles treated by the first modifier according to the proportion; weighing part of mixing water; and stirring uniformly;
weighing the rest mixing water, the fine aggregate, the coarse aggregate and the second modifier according to the proportion, and putting the mixture into a stirring pot for uniformly stirring;
and (3) filling the uniformly stirred modified rubber concrete into a test mold, vibrating and molding, and testing after a specified age.
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| CN113443871A (en) * | 2021-06-18 | 2021-09-28 | 国网新源控股有限公司 | Concrete for filling gap between pressure steel pipe and underground surrounding rock |
| CN114149229A (en) * | 2021-12-21 | 2022-03-08 | 中交上海三航科学研究院有限公司 | Ultrahigh-performance concrete for suspended tunnel pipe section and preparation method thereof |
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