CN114149229B - Ultrahigh-performance concrete for suspended tunnel pipe section and preparation method thereof - Google Patents
Ultrahigh-performance concrete for suspended tunnel pipe section and preparation method thereof Download PDFInfo
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- CN114149229B CN114149229B CN202111569034.9A CN202111569034A CN114149229B CN 114149229 B CN114149229 B CN 114149229B CN 202111569034 A CN202111569034 A CN 202111569034A CN 114149229 B CN114149229 B CN 114149229B
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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
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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
- 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
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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
- 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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The application aims to provide ultra-high performance concrete for a suspended tunnel pipe section and a preparation method thereof, and is characterized by at least comprising the following components, by mass, 100-120 parts of superfine portland cement; 30-60 parts of granulated blast furnace slag powder; 15-25 parts of fly ash microbeads; 10-30 parts of metakaolin; 10-15 parts of an expanding agent; 20-40 parts of rubber powder; 70-100 parts of rubber particles; 1-3 parts of a rubber modifier; 60-100 parts of aggregate; 40-60 parts of fibers; 2-5 parts of an additive; 20-35 parts of blending water. Compared with the prior art, the ultra-high performance concrete has good performances such as impact resistance and durability, and therefore the construction and use requirements of the suspension tunnel are met.
Description
Technical Field
The invention belongs to the technical field of concrete materials, and particularly relates to ultra-high performance concrete for a suspended tunnel pipe section and a preparation method thereof.
Background
The underwater floating tunnel is one of the infrastructures such as the commonly used tunnel pipe sections, is usually applied to traffic structures such as crossing straits, gulfs, lakes and other water channels, and has the advantages of small influence of natural environment, freer selection of construction sites, short transit time, environmental protection, no damage to the natural landscapes of the construction sites and the like. Therefore, the underwater suspension tunnel is receiving more and more attention.
When a suspended tunnel pipe section is designed and built, the suspended tunnel pipe section needs to bear common loads such as wave, ocean current and other fluid-solid coupling acting forces under the conventional conditions, and also needs to bear sudden impact of foreign objects, sudden loads under extreme environments such as typhoon, tsunami and the like, dynamic acting forces caused by earthquake, dead weight change and corrosion caused by attachment of marine organisms and the like, so that the suspended tunnel pipe section has good impact resistance, fatigue resistance and the like.
Therefore, how to provide a novel ultra-high performance concrete to improve the performances such as impact resistance and durability thereof, so as to meet the construction and use requirements of the suspension tunnel is a technical problem to be solved urgently.
Disclosure of Invention
In view of the above disadvantages or shortcomings of the prior art, the present invention provides an ultra-high performance concrete for a suspended tunnel pipe section and a method for preparing the same, which can improve the performances of impact resistance, durability, etc., thereby meeting the requirements of construction and use of a suspended tunnel.
In order to solve the technical problem, the invention provides an ultrahigh-performance concrete for a suspended tunnel pipe section, which at least comprises the following components in parts by mass:
100-120 parts of superfine portland cement;
30-60 parts of granulated blast furnace slag powder;
15-25 parts of fly ash microbeads;
10-30 parts of metakaolin;
10-15 parts of an expanding agent;
20-40 parts of rubber powder;
70-100 parts of rubber particles;
1-3 parts of a rubber modifier;
60-100 parts of aggregate;
40-60 parts of fibers;
2-5 parts of an additive;
20-35 parts of blending water.
Further preferably, the rubber particles include at least: first rubber particles; second rubber particles; wherein the mass ratio of the first rubber particles to the second rubber particles is 1. The rubber powder and the rubber particles can replace cementing materials such as cement and the like through the superposition effect of the rubber powder and the rubber particles, so that the toughness and the impact property of a cement paste matrix are effectively improved, and the rubber particles with two particle sizes are matched to replace aggregates so as to reduce the weight of the aggregates, so that the toughness and the impact resistance of the ultrahigh-performance concrete can be effectively and synchronously improved.
Further preferably, the particle diameter of the first rubber particles is 1 to 3mm; the particle size of the second rubber particles is 3-5mm; the fineness particle size of the rubber powder is more than or equal to 2000 meshes.
Further preferably, the rubber modifier comprises a first modifier and a second modifier; wherein the first modifier comprises: a silane coupling agent; the second modifier comprises: an aluminate coupling agent; wherein the mass ratio of the first modifier to the second modifier is 1. The interface bonding of the rubber particles and a cement matrix, fibers and a matrix in the ultra-high performance concrete is improved by adopting two modifiers, so that the effect of the rubber particles in the ultra-high performance concrete is fully exerted, wherein the first modifier can adopt a coupling agent SI69, so that the bonding of the rubber powder and the rubber particles with silicon elements in cement, mineral powder, fly ash microbeads, silica fume and the like is facilitated, and the bonding of the rubber powder and the rubber particles with the matrix is improved. The second modifier can adopt an aluminate coupling agent DL-411 to facilitate the combination of rubber powder, rubber particles and fibers with various elements in a concrete matrix, so that a structure of a combination layer of the rubber powder, the rubber particles, the coupling agent, the cement matrix and the fibers is formed, and the performance of the rubber modified ultrahigh-performance concrete is improved.
Further preferably, the strength grade of the superfine portland cement is not lower than 62.5; the specific surface area of the superfine portland cement is not less than 1200m 2 Per kg; the granulated blast furnace slag powder includes: ultra-fine granulated blast furnace slag powder with a specific surface area of not less than 1300m 2 /kg。
Further preferably, the fly ash microbeads include: ultra-fine fly ash; the content of spherical microbeads in the ultrafine fly ash is not less than 95%, the fineness is not less than 1300 meshes, and the loss on ignition is less than 2%. By adopting the ultrafine granulated blast furnace slag powder and the fly ash microbeads with the parameters as mineral admixture in the ultra-high performance concrete, the mechanical property of hardened concrete, the workability of concrete mixing, the durability of concrete and the like can be better improved.
Further preferably, the metakaolin is ultrafine metakaolin, and the specific surface area of the ultrafine metakaolin is not less than 25000m 2 (iv) kg; the content of anhydrous aluminum silicate in the metakaolin is not less than 96%. The metakaolin is used for replacing silica fume usually adopted by the existing concrete, and then the metakaolin is doped with the other components, so that the defects of larger concrete viscosity and the like caused by the silica fume adopted by the existing concrete can be avoided, and the using amount of the water reducing agent can be saved, thereby being beneficial to the workability of the ultra-high performance concrete.
Further preferably, the swelling agent includes at least: calcium oxide and magnesium oxide; wherein the mass ratio of the calcium oxide to the magnesium oxide is preferably 3. By adopting the mode of compounding the two expansion agents of calcium oxide and magnesium oxide, the shrinkage of the concrete can be compensated, for example, the early shrinkage of the ultrahigh concrete is quickly compensated through the early reaction of calcium oxide, the later shrinkage of the ultrahigh concrete is compensated through the later activity of magnesium oxide, so that the volume stability of the ultrahigh concrete is controlled, and the synchronous compensation shrinkage performance matched with the ultrahigh concrete is ensured by means of the complementary effect of calcium oxide and magnesium oxide, so that the ultrahigh concrete has good long-term volume stability, the shrinkage cracks can be reduced, and the durability of the suspended tunnel pipe section material is improved.
Further has the advantages ofOptionally, the aggregate at least comprises: the basalt machine-made sand has fineness of 50-120 meshes and apparent density of not less than 2800kg/m 3 Bulk density of not less than 2000kg/m 3 。
Further preferably, the fibers comprise at least: steel fibers and carbon fibers; the mass ratio of the steel fibers to the carbon fibers is 7-8.
Further preferably, the steel fiber is stainless steel end hook type fine steel fiber, the length of the steel fiber is 10-15mm, the diameter of the steel fiber is 0.15-0.20mm, the tensile strength is more than 3.0GPa, and the elastic modulus is 210-230Gpa; the carbon fiber is PAN-based high-strength carbon fiber, the length of the carbon fiber is 1.5-2.5mm, the diameter of the carbon fiber is 6-8 mu m, the tensile strength is more than 3.5GPa, the elastic modulus is 240-260GPa, and the carbon content is more than 95%. The complementary effect of the size is fully exerted by adopting the micro steel fibers and the superfine carbon fibers, for example, the expansion of a larger crack can be effectively controlled by the micro steel fibers with larger size, and the expansion of a micro crack of a cement matrix can be effectively controlled by the carbon fibers with small size, so that the tensile strength and the shock resistance of the ultra-high performance concrete can be effectively improved by two synergistic effects.
Further preferably, the admixture comprises: the water reducing agent and the defoaming agent are mixed according to a mass ratio of 8; the water reducing rate of the water reducing agent is more than 35%, and the gas content is not more than 4.0%; the content of effective substances of the defoaming agent is not less than 99%, and the retention amount of a 20-mesh screen is not more than 3%; the water reducing agent comprises: a polycarboxylic acid water reducing agent; the defoaming agent comprises: a water-soluble powder defoaming agent.
The application also provides a preparation method for preparing the ultra-high performance concrete for suspending the tunnel pipe section, which comprises the following steps:
mixing a first modifier in the obtained rubber modifiers with water according to a preset proportion at the temperature of 40-45 ℃ to form a dissolved solution, respectively adding the rubber powder and the rubber particles, stirring for 30-40 s, and then drying the dissolved solution to obtain dried rubber powder and rubber particles, wherein the proportion of the first modifier to the water is preferably 4;
and adding the obtained superfine cement, the granulated blast furnace slag powder, the fly ash microbeads, the metakaolin, the expanding agent, the aggregate, the expanding agent, the dried rubber powder and the rubber particles into mixing water, and uniformly stirring for 120-150 seconds.
And adding the obtained fiber and a second modifier in the rubber modifier into the mixture and stirring for 90-120 s to obtain the ultra-high performance concrete.
Compared with the prior art, the invention has the following beneficial effects:
the application provides an ultra-high performance concrete for a suspended tunnel pipe section and a preparation method thereof, which can improve the performances of impact resistance, durability and the like of the concrete, so that the construction and use requirements of a suspended tunnel are met.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1: a flow chart of a method of making ultra high performance concrete according to a first embodiment of the invention.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
1. The raw materials of the ultra-high performance concrete for suspending the tunnel pipe section of the embodiment include the following:
(1) Cement: ultra-fine portland cement of strength grade 62.5 type I with specific surface area of 1200m 2 /kg。
(2) Slag powder: s140 granulating blast furnace slag powder with a specific surface area of 1300m 2 /kg。
(3) Coal ash micro-beads: the fineness is 1300 meshes, and the loss on ignition is 1%.
(4) Metakaolin: ultrafine metakaolin having a specific surface area of 25000m 2 Activity index at 28 days was 96% per kg.
(5) Expansion deviceSwelling agent: the expanding agent is compounded by calcium oxide and magnesium oxide, wherein the calcination temperature of the calcium oxide is controlled to be 1100 ℃, the calcination temperature of the magnesium oxide is controlled to be 1250 ℃, the mass ratio of the calcium oxide to the magnesium oxide is 3 2 Kg, mass purity 98%.
(6) Rubber powder: the fineness and the grain diameter of the powder are 2000 meshes.
(7) Rubber particles: the rubber particles are compounded by first rubber particles with the particle size of 1-3mm and second rubber particles with the particle size of 3-5mm, and the mass ratio of the rubber particles to the rubber particles is 1.
(8) Rubber modifier: the composite modifier is prepared by compounding a coupling agent SI69 serving as a first modifier and an aluminate coupling agent DL-411 serving as a second modifier, wherein the mass ratio of the first modifier to the second modifier is 1.
(9) Aggregate: the basalt machine-made sand has the fineness of 100 meshes and the apparent density of 2800kg/m 3 Bulk density 2000kg/m 3 。
(10) Fiber: the steel fiber and the carbon fiber are mixed, wherein the mass ratio of the steel fiber to the carbon fiber is 8.
(11) Additive: the water reducing rate of the high-performance water reducing agent such as a polycarboxylic acid water reducing agent is 40 percent, the content of active substances of the water-soluble powder defoaming agent is 99.5 percent, and the retention amount of a 20-mesh screen is 1 percent; wherein the mass ratio of the polycarboxylic acid high-performance water reducing agent to the defoaming agent is 8.
(12) Mixing water: city tap water is adopted.
2. Test method of the present example
(1) Workability
According to the relevant provisions of GB/T standard of common concrete mixture performance test method.
(2) Compressive strength
According to the relevant regulations of GB/T31387 reactive powder concrete and GB/T50204 Standard test method for mechanical properties of common concrete.
(3) Volume stability, fatigue resistance and durability: reference is made to GB/T50448 technical Specification for cement-based grouting materials and GB/T50082 Standard for testing the long-term performance and durability of ordinary concrete.
(4) Bending resistance toughness
The trabecula with the specification of 100 multiplied by 515mm is prepared and molded by the ultra-high performance concrete, the bending-resistant total curve of the notched beam is respectively tested after the notch is spanned and the notch depth is 5cm and the age is 28 days, and a 1000kN microcomputer-controlled electro-hydraulic servo universal testing machine produced by Shenzhen Sansi longitudinal and transverse science and technology Limited company is adopted to carry out the three-point bending-resistant total curve.
(5) Impact resistance
A100X 400mm trabecula is prepared and molded by the ultra-high performance concrete, 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.
(6) 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).
3. The curing method adopted in this embodiment is as follows: the curing temperature is 18-22 ℃, and the curing humidity is more than 95%.
4. The proportion and various performance tests of the ultra-high performance concrete in the embodiment
(1) In the embodiment, the mixing ratio of the ultra-high performance concrete in each example is as shown in table 1 below:
TABLE 1 ultra high Performance concrete mix proportion (parts by weight)
As can be seen from table 1 above: examples 1, 2 and 3 represent reference ultra high performance concrete used in comparative examples 1 to 3; examples 4 and 7 show ultra high performance concrete doped with rubber powder alone for comparative example 4 and comparative example 7; examples 5 and 6 show ultra-high performance concrete with rubber particles incorporated alone, for comparative example 5 and comparative example 6; examples 8 to 10 show ultra-high performance concrete doped with both rubber powder and rubber particles, i.e., rubber-modified ultra-high performance concrete, i.e., ultra-high performance concrete for suspending tunnel pipe sections.
(2) Workability
The results of slump, expansion and setting time tests of the ultra-high performance concrete of the above examples are shown in table 2 below:
TABLE 2 test results of the workability of ultra high Performance concrete
The test results of table 2 above show that: the slump, the expansion and the setting time of the rubber modified ultra-high performance concrete (specifically, reference examples 8, 9 and 10) are equivalent to those of the benchmark ultra-high performance concrete (specifically, reference examples 1 to 3) and the ultra-high performance concrete (specifically, reference examples 4 and 7) doped with the rubber powder alone, and the ultra-high performance concrete (specifically, reference examples 5 and 6) doped with the rubber particles alone, so that the construction requirements of the suspended tunnel pipe section can be met.
(3) Compressive strength and flexural strength Properties
The test results of the compressive strength and the flexural strength of the ultra-high performance concrete in each of the above examples are shown in table 3 below, wherein the test ages of the compressive strength and the flexural strength of the ultra-high performance concrete in each of the examples are 3 days, 7 days, and 28 days, respectively.
TABLE 3 test results (MPa) of compressive strength and flexural strength of ultra-high performance concrete
The results of the tests in table 3 above show that: the compression strength of the rubber modified ultra-high performance concrete (specifically, refer to example 8, example 9 and example 10) in 28 days is more than 200MPa, and is equivalent to that of the standard ultra-high performance concrete, while the flexural strength is more than 40MPa, and is obviously higher than that of the standard ultra-high performance concrete (specifically, refer to examples 1 to 3), the ultra-high performance concrete (specifically, refer to example 4 and example 7) singly doped with rubber powder and the ultra-high performance concrete (specifically, refer to example 5 and example 6) singly doped with rubber particles in 28 days, so that the concrete has lower brittleness and good impact resistance, and can meet the use requirement of the ultra-high strength of the suspension tunnel.
(4) Bending resistance
The bending resistance test results of the ultra-high performance concrete in the above examples are shown in table 4 below, wherein the bending resistance is calculated from the bending resistance full curve of the notched beam and the method described in the related literature, and the performance indexes such as the fracture energy, peak load, and ductility index of the concrete shown in table 4 below are calculated.
TABLE 4 fracture energy, peak load and ductility index test results for ultra high Performance concrete
The test results in table 4 above show that: the rubber-modified ultra-high performance concrete (specifically, reference examples 8, 9 and 10) has higher fracture energy and ductility index than the benchmark ultra-high performance concrete (specifically, reference examples 1 to 3), the ultra-high performance concrete (specifically, reference examples 4 and 7) doped with the rubber powder alone, and the ultra-high performance concrete (specifically, reference examples 5 and 6) doped with the rubber particles alone, and thus has ultra-high fracture energy and ductility index, and thus has good toughness.
(5) Impact resistance
The impact resistance test results of the ultrahigh-performance concrete in the above embodiments are shown in table 5 below, wherein the impact resistance indexes of the ultrahigh-performance concrete in the 28-day age are tested, and the test indexes mainly include: number of incipient cracks and number of fractures.
TABLE 5 ultra high Performance concrete impact resistance test results
The results of the above tests in Table 5 show that: the initial cracking times and the breaking times of the rubber modified ultra-high performance concrete (specifically, refer to examples 8, 9 and 10) are obviously higher than those of the benchmark ultra-high performance concrete (specifically, refer to examples 1 to 3), the ultra-high performance concrete (specifically, refer to examples 4 and 7) doped with the rubber powder alone and the ultra-high performance concrete (specifically, refer to examples 5 and 6) doped with the rubber particles alone, so that the rubber modified ultra-high performance concrete has good impact resistance and can meet the construction quality requirement of the pipe section of the suspension tunnel.
(6) Durability
The durability test results of the ultra-high performance concrete in the above examples are shown in table 6 below, and the test indexes thereof include: the electric flux and diffusion coefficient of ultra-high performance concrete.
TABLE 6 concrete durability test results
The test results in table 6 above show that: the electric flux and diffusion coefficient of the rubber modified ultra-high performance concrete (specifically, reference examples 8, 9 and 10) were significantly lower than those of the reference ultra-high performance concrete (specifically, reference examples 1 to 3), the ultra-high performance concrete (specifically, reference examples 4 and 7) doped with the rubber powder alone, and the ultra-high performance concrete (specifically, reference examples 5 and 6) doped with the rubber particles alone, and thus, had good durability.
The above test data show that, compared with the prior art, the ultra-high performance concrete provided in the above examples 8 to 10 has the following effects: the composite cement paste matrix has the advantages that the composite effect of the rubber powder and the rubber particles is adopted, cement and other cementing materials can be replaced, various performances of the prepared cement paste matrix, such as compressive strength, flexural strength, bending resistance, impact resistance and the like, are effectively improved, rubber particles with two particle sizes are matched and replace aggregates, so that the amount of the aggregates is reduced, and adverse effects caused by the fact that the tensile strength of concrete is easy to generate cracks due to the fact that the content of the aggregates is too high are reduced. And the performance of the ultra-high performance concrete can be effectively improved by matching the concrete with other substances, such as superfine portland cement, fly ash micro-beads, metakaolin, an expanding agent, a rubber modifier and the like.
In addition, the ultra-high performance concrete provided by the embodiments 8 to 10 also has the advantages of good fluidity, good constructability, ultra-high strength, low shrinkage, high durability and the like, is particularly suitable for preparing a suspended tunnel pipe section, and has good economic and social benefits.
Further, it is to be noted that the swelling agents in the above examples 8 to 10 may preferably be of at least two kinds of constitution, for example, calcium oxide and magnesium oxide; among them, the mass ratio of calcium oxide to magnesium oxide is preferably 3. By adopting the mode of compounding the two expansion agents of calcium oxide and magnesium oxide, the shrinkage of the concrete can be compensated, for example, the early shrinkage of the ultrahigh concrete is quickly compensated through the early reaction of calcium oxide, the later shrinkage of the ultrahigh concrete is compensated through the later activity of magnesium oxide, so that the volume stability of the ultrahigh concrete is controlled, and the synchronous compensation shrinkage performance matched with the ultrahigh concrete is ensured by means of the complementary effect of calcium oxide and magnesium oxide, so that the ultrahigh concrete has good long-term volume stability, the shrinkage cracks can be reduced, and the durability of the suspended tunnel pipe section material is improved.
It is to be noted that the rubber modifiers in each of examples 8 to 10 may preferably be at least two types, for example: the first modifier can adopt a coupling agent SI69 to facilitate the combination of the rubber powder and the rubber particles with silicon elements in cement, mineral powder, fly ash micro-beads, silica fume and the like and improve the bonding of the rubber powder and the rubber particles with a matrix. The second modifier can adopt an aluminate coupling agent DL-411 to facilitate the combination of rubber powder, rubber particles and fibers with various elements in a concrete matrix, thereby forming a structure of a combination layer of the rubber powder, the rubber particles, the coupling agent, the cement matrix and the fibers and improving the performance of the rubber modified ultra-high performance concrete.
In addition, it should be noted that the steel fibers in the above examples 8 to 10 can be preferably stainless steel end hook type fine steel fibers, which have a length of 10 to 15mm, a diameter of 0.15 to 0.20mm, a tensile strength of more than 3.0GPa, and an elastic modulus of 210 to 230GPa; the carbon fiber is PAN-based high-strength carbon fiber, the length of the carbon fiber is 1.5-2.5mm, the diameter of the carbon fiber is 6-8 mu m, the tensile strength is more than 3.5GPa, the elastic modulus is 240-260GPa, and the carbon content is more than 95%. The complementary effect of the size is fully exerted by adopting the micro steel fibers and the superfine carbon fibers, for example, the expansion of a larger crack can be effectively controlled by the micro steel fibers with larger size, and the expansion of a micro crack of a cement matrix can be effectively controlled by the carbon fibers with small size, so that the tensile strength and the shock resistance of the ultra-high performance concrete can be effectively improved by two synergistic effects.
6. The present embodiment also provides a preparation method for preparing the ultra-high performance concrete for suspending the tunnel pipe sections in examples 8 to 10, as shown in fig. 1, the preparation method comprising the steps of:
step S1, mixing a first modifier in the obtained rubber modifiers with water according to a preset proportion at the temperature of 40-45 ℃ to form a dissolved solution, adding rubber powder and rubber particles respectively, stirring for 30-40S, and then drying the dissolved solution to obtain dried rubber powder and rubber particles, namely drying the water in the dissolved solution in a natural or artificial mode such as evaporation, absorption and the like to obtain dried rubber powder and rubber particles. The ratio of water to the rubber modifier in the solution may be such that the rubber modifier is sufficiently dissolved, and for example, the ratio of the first modifier to water is 4.
And S2, adding mixing water into the obtained superfine cement, the obtained granulated blast furnace slag powder, the obtained fly ash microbeads, the obtained metakaolin, the obtained expanding agent, the obtained aggregate, the obtained expanding agent, the obtained dried rubber powder and the obtained dried rubber particles, and uniformly stirring for 120-150 seconds to obtain a mixture.
And S3, adding the second modifier in the obtained fiber and rubber modifier into the mixture and stirring for 90-120S to obtain the ultra-high performance concrete.
The above embodiments are merely to illustrate the technical solution of the present invention, not to limit the same, and the present invention has been described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and it is intended to cover the appended claims.
Claims (7)
1. The ultra-high performance concrete for the suspended tunnel pipe section is characterized by at least comprising the following components in parts by mass:
100-120 parts of superfine portland cement;
30-60 parts of granulated blast furnace slag powder;
15-25 parts of fly ash microbeads;
10-30 parts of metakaolin;
10-15 parts of an expanding agent;
20-40 parts of rubber powder;
70-100 parts of rubber particles;
1-3 parts of a rubber modifier;
60-100 parts of aggregate;
40-60 parts of fibers;
2-5 parts of an additive;
20-35 parts of mixing water;
wherein the rubber particles comprise at least: first rubber particles; second rubber particles; wherein the mass ratio of the first rubber particles to the second rubber particles is 1 to 2;
the particle size of the first rubber particles is 1-3mm; the particle size of the second rubber particles is 3-5mm; the fineness particle size of the powder of the rubber powder is more than or equal to 2000 meshes;
the rubber modifier comprises a first modifier and a second modifier; wherein the first modifier comprises: a silane coupling agent; the second modifier comprises: an aluminate coupling agent; wherein the mass ratio of the first modifier to the second modifier is 1.
2. The ultra-high performance concrete for suspending tunnel pipe sections of claim 1, wherein the strength grade of the ultra-fine portland cement is not less than 62.5; the specific surface area of the superfine portland cement is not less than 1200m 2 Per kg; the granulated blast furnace slag powder includes: ultra-fine granulated blast furnace slag powder with a specific surface area of not less than 1300m 2 /kg。
3. The ultra-high performance concrete for suspending tunnel pipe sections of claim 1, wherein the fly ash micro-beads comprise: ultra-fine fly ash; the content of the spherical microbeads in the ultrafine fly ash is not less than 95%, the fineness is not less than 1300 meshes, and the loss on ignition is less than 2%.
4. The ultra-high performance concrete for suspending a tunnel pipe segment of claim 1, wherein the metakaolin is ultra-fine metakaolin having a specific surface area of not less than 25000m 2 (iv) kg; the content of anhydrous aluminum silicate in the metakaolin is not less than 96 percent; the swelling agent at least comprises: calcium oxide and magnesium oxide; wherein the mass ratio of the calcium oxide to the magnesium oxide is 3; the aggregate at least comprises: the basalt machine-made sand has fineness of 50-120 meshes and apparent density of not less than 2800kg/m 3 Bulk density of not less than 2000kg/m 3 。
5. The ultra high performance concrete for suspending tunnel pipe sections of claim 1, wherein the fibers comprise at least: steel fibers and carbon fibers; the mass ratio of the steel fiber to the carbon fiber is 7 to 3 to 8; the steel fiber is stainless steel end hook type micro steel fiber, the length of the steel fiber is 10-15mm, the diameter of the steel fiber is 0.15-0.20mm, the tensile strength is more than 3.0GPa, and the elastic modulus is 210-230Gpa; the carbon fiber is PAN-based high-strength carbon fiber, the length of the carbon fiber is 1.5-2.5mm, the diameter of the carbon fiber is 6-8 μm, the tensile strength is more than 3.5GPa, the elastic modulus is 240-260GPa, and the carbon content is more than 95%.
6. The ultra-high performance concrete for suspending tunnel pipe sections according to claim 1, wherein the admixture comprises: the water reducing agent and the defoaming agent are mixed according to a mass ratio of 8; the water reducing rate of the water reducing agent is more than 35 percent, and the gas content is not more than 4.0 percent; the content of effective substances of the defoaming agent is not less than 99%, and the retention amount of a 20-mesh screen is not more than 3%; the water reducing agent comprises: a polycarboxylic acid water reducing agent; the defoaming agent comprises: a water-soluble powder defoaming agent.
7. A method of preparing the ultra high performance concrete for suspending tunnel pipe sections according to any one of claims 1 to 6, comprising the steps of:
mixing a first modifier in the obtained rubber modifiers with water according to a preset proportion at the temperature of 40-45 ℃ to form a dissolved solution, respectively adding the rubber powder and the rubber particles, stirring for 30-40 s, and drying the dissolved solution to obtain dried rubber powder and rubber particles;
adding the obtained superfine portland cement, the granulated blast furnace slag powder, the fly ash microbeads, the metakaolin, the expanding agent, the aggregate, the expanding agent and the dried rubber particles into the mixing water, and uniformly stirring for 120-150s to obtain a mixture;
adding the obtained fiber and a second modifier in the rubber modifier into the mixture and stirring for 90-120 s to obtain the ultra-high performance concrete.
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| 丁庆军 ; 李进辉 ; 耿雪飞 ; 赵明宇 ; .橡胶颗粒掺杂提高超高性能混凝土的抗冲磨性能及其机理.硅酸盐学报.2020,(第10期),第136-143页. * |
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