CN113968698B - Cement-based grouting material for offshore wind power jacket and application thereof - Google Patents
Cement-based grouting material for offshore wind power jacket and application thereof Download PDFInfo
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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
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
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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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Abstract
The invention belongs to the technical field of cement-based materials, and particularly relates to a cement-based grouting material for an offshore wind power jacket, which comprises cement, filling ultrafine powder, dispersing ultrafine powder, nano materials, sand, a composite expansion component, a defoaming agent, a superplasticizer and a dispersing agent which are mixed according to a specific proportion; wherein the sand is selected from at least two of low-density aggregate, medium-density aggregate and high-density aggregate, and is continuously graded within a three-stage grain size range of not more than 1.18mm, 1.18 mm-2.36 mm and 2.36 mm-4.75 mm. The cement-based grouting material with adjustable volume weight and elastic modulus is prepared through the synergistic effect of skeleton design, cementing material matching and interface improvement, has large flow state and ultrahigh mechanical property, and really achieves the aim of controllable and adjustable volume weight and elastic modulus of the cement-based grouting material. The cement-based grouting material has the advantages of simple application method, no need of secondary stirring and short stirring time, and can be mixed with water according to the water-material ratio of 0.085:1-0.095:1.
Description
Technical Field
The invention belongs to the technical field of cement-based materials, and particularly relates to a cement-based grouting material for an offshore wind power jacket and application of the cement-based grouting material.
Background
With the development of offshore wind power construction in China, wind power plant construction site selection gradually goes from an intertidal zone to the sea, the offshore distance is more and more, the stand height is larger, the water depth is continuously increased, the sea condition is more complex, and the improvement of equipment foundation bearing and stability requirements provides greater challenges for grouting connection technology. The current offshore wind power foundation types adopted in the world comprise single pile foundations, multi-angle frame foundations, jacket foundations, gravity foundations, floating foundations and other structural types; the single pile foundation, the multi-angle frame foundation, the jacket foundation and the gravity type foundation are adopted, the connection of the fan foundation and the steel pipe pile is performed in a grouting mode, the grouting technology is used as an important key technology for installing the fan foundation, and the grouting quality of the grouting technology directly influences the overall stability and safety of a pile foundation. The grouting connecting section structurally plays a role in supporting up and down, plays a role in supporting up and down after construction, and can reduce fan installation errors and fatigue damage through grouting connection.
Because of the special service environment and construction process of the grouting connection section, the grouting material is required to have the performances of large fluidization, ultrahigh strength, high elastic modulus, high early strength, fatigue resistance and the like. The large flow state is favorable for grouting slurry underwater construction and filling, continuous smoothness of grouting construction is ensured, the compressive strength of the grouting slurry is closely related to the axial pressure bearing capacity of the grouting connecting section, and the higher the compressive strength of the grouting slurry is, the higher the ultimate bonding strength of the corresponding grouting connecting section is, so that the grouting slurry and the grouting connecting section are positively related.
The elastic modulus of grouting material reflects the capacity of the material to resist deformation when loaded, and high elastic modulus means smaller volume deformation of grouting material under the same load effect, so that the grouting connection section is ensured to be in a safe and controllable deformation range under the action of external force load. The ultra-high strength grouting material is mainly prepared by cement, high-strength aggregate and ultrafine powder based on the principle of closest packing, and the apparent density, hardness and elastic modulus of the fine aggregate obviously influence the compressive strength and elastic modulus of the grouting material. The larger the apparent density and hardness of the fine aggregate, the higher the volume ratio of the fine aggregate in grouting material, the higher the strength of the corresponding grouting material and the higher the elastic modulus; but simultaneously, the volume weight of grouting material slurry is larger, on one hand, the larger volume weight of a grouting material system under a large flow state leads to larger density difference of bone slurry, thereby causing aggregate sedimentation and separation, and on the other hand, the higher volume weight increases single dosage of the grouting material, and the cost is increased. Therefore, under the condition of large flow state, the realization of the performances of low volume weight, high strength and high elastic modulus and the like of the grouting material is an urgent technical requirement in the current application.
At present, the grouting material is mainly researched for compressive strength, but the technologies achieve larger 28d compressive strength, but have other disadvantages. For example, the cement-based ultrahigh-strength shrinkage-free grouting material has the compressive strength of up to 120MPa at normal temperature for 28d, but the grouting material matrix is reinforced by steel fibers, so that the grouting material matrix is not suitable for an application environment with high requirements on fluidity and pumping performance of the grouting material, and the durability problems such as chloride ion corrosion and the like can be caused by the addition of the steel fibers in the application process of an offshore wind farm; for another example, the standard curing 28d compressive strength of the high-strength super-fluid expansion cement grouting material can reach 90MPa, but the early strength is lower, and the 1d compressive strength is only 20MPa, so that the high-efficiency construction is not facilitated; and the compressive strength of the ultra-high strength cement material can reach 150MPa, but the material has poor fluidity, can not realize self-leveling and is difficult to pump, and a special hot pressing manufacturing process is needed, so that the method does not have the condition of field application. On the basis of the performance design of cement-based grouting materials, the large flow state is the most basic construction requirement, and on the basis, the mechanical property of ultrahigh strength is required to be met, and further requirements are put forward on the aspects of high elastic modulus, low volume weight and the like. Although relevant researches and reports on offshore wind power jacket grouting materials and construction methods thereof exist at present, the technology cannot achieve the performance indexes of ultrahigh strength and high elastic modulus under the standard culture system of grouting materials, the volume weight is not described, secondary stirring and premixing are needed for preparing the grouting materials, the stirring time is long, and the service efficiency of the materials is affected.
However, based on the influence relation between the elastic modulus and the volume weight in the general cement-based grouting material design method, the performance requirements of high elastic modulus and low volume weight are difficult to be considered; therefore, development of an ultrahigh-strength cement-based grouting material for offshore wind power grouting connection, which has high elastic modulus and low volume weight on the premise of meeting the rheological requirement, is needed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the cement-based grouting material for the offshore wind power jacket, which realizes the aim of adjusting the elastic modulus and the volume weight through the synergistic effect of framework design, cementing material matching and interface improvement, and can ensure that the volume weight of the slurry is 2400kg/m when the static elastic modulus of the cement-based grouting material is 50 GPa-60 GPa 3 ～2900kg/m 3 And changes between.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the cement-based grouting material for the offshore wind power jacket comprises the following components in percentage by mass:
wherein the sand is selected from at least two of low-density aggregate, medium-density aggregate and high-density aggregate, and is continuously graded within the three-level grain diameter range of not more than 1.18mm, 1.18 mm-2.36 mm and 2.36 mm-4.75 mm; the low-density aggregate is yellow sand and/or quartz sand, the medium-density aggregate is limestone and/or basalt, and the high-density aggregate is at least one of alumina, corundum, white corundum, brown corundum and silicon carbide; the maximum grain diameter of the sand is less than 4.75mm, and the volume density is 2.5g/cm 3 ～3.9g/cm 3 The water absorption rate is not more than 4%.
Further, the filling ultrafine powder is selected from any one or a mixture of any two of silica fume, zeolite ultrafine powder and ultrafine rice hull ash, and the specific surface area of the filling ultrafine powder is more than 15000m 2 /kg。
Further, the dispersible ultrafine powder is selected from a mixture of at least two of ultrafine fly ash, ultrafine limestone powder, silica micropowder, glass powder, ultrafine mineral powder and metakaolin, and the average particle size of the dispersible ultrafine powder is 2-15 mu m.
Further, the nanomaterial is selected from any one or a mixture of any two of nano silicon dioxide, nano calcium carbonate, nano carbon fiber, carbon nano tube and nano metal oxide.
Further, the initial fluidity of the cement-based grouting material is not less than 280mm, the compressive strength after water curing for 28 days at 20 ℃ is more than 150MPa, the flexural strength is more than 22MPa, the static elastic modulus is 50 GPa-60 GPa, and the volume weight is 2400kg/m 3 ～2900kg/m 3 。
Further, the composite expansion component is a mixture of a plastic expansion agent and a multi-active hardening stage composite expansion agent in a mass ratio of 1-1.8:100; wherein the multi-active hardening stage composite expanding agent is formed by mixing high-active MgO, medium-active MgO and low-active MgO.
Further, the defoamer is an organosilicon defoamer.
Further, the superplasticizer is a polycarboxylic acid high-performance water reducer, and the water reducing rate is not lower than 35%.
Further, the dispersing agent is a mixture of sodium tripolyphosphate and sodium hexametaphosphate in a mass ratio of 1:2.
Another object of the present invention is to provide a method for applying the cement-based grouting material as defined in any one of the above, wherein the cement-based grouting material is directly mixed with water; wherein the water-material ratio is 0.085:1-0.095:1.
The cement-based grouting material with adjustable volume weight and elastic modulus is prepared by the synergistic effect of skeleton design, cementing material matching and interface improvement, has large flow state and ultra-high mechanical property, has initial fluidity not lower than 280mm, compressive strength not lower than 150MPa after water curing for 28 days at 20 ℃, has flexural strength higher than 22MPa, and has slurry volume weight of 2400kg/m when the static elastic modulus is between 50GPa and 60GPa 3 ～2900kg/m 3 The change between the two is carried out,the cement-based grouting material really realizes the aim of controllable and adjustable volume weight and elastic modulus of the cement-based grouting material, and solves the problem that the volume weight and the elastic modulus of the grouting material cannot be considered. The cement-based grouting material provided by the invention can be directly mixed with the mixing water when being applied, secondary stirring and premixing are not needed, and the stirring time is short.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail. This invention may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided to explain the principles of the invention and its practical application so that others skilled in the art will be able to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated.
Aiming at the defect that the common cement-based grouting material in the prior art cannot further consider the high elastic modulus and the low volume weight on the premise of ensuring the fluidity and the ultrahigh strength, the cement-based grouting material with large flow state, ultrahigh mechanical property and considering the volume weight and the elastic modulus is prepared through the synergistic effect of framework design, cementing material matching and interface improvement, and the grouting material is particularly suitable for connection of offshore wind power jackets.
Referring specifically to table 1 below, the components and their contents of the cement-based grouting material for offshore wind turbine jackets of the present invention are shown.
TABLE 1 Cement-based grouting materials composition and content wt%
Of particular note, the specific formulation of sand is most critical in the above formulation of the cement-based grouting material of the present invention. The sand is selected from at least two of low-density aggregate, medium-density aggregate and high-density aggregate, the low-density aggregate is selected from at least one of yellow sand and quartz sand, the medium-density aggregate is selected from at least one of limestone and basalt, and the high-density aggregate is selected from alumina, silicon carbide, white corundum, brown corundum and silicon carbideAt least one of; and controlling the maximum grain diameter of the sand to be less than 4.75mm and the volume density to be 2.5g/cm 3 ～3.9g/cm 3 The water absorption rate is not more than 4%. More specifically, the particle size of the sand is formed by three-stage continuous gradation of not more than 1.18mm, 1.18mm to 2.36mm and 2.36mm to 4.75 mm. On the one hand, the composition of the sand is required to meet the requirement of selecting at least two of the high, medium and low dense aggregates, and the rule of continuously grading the three-level particle size is required to be met.
In the cement-based grouting material of the invention, the filling ultrafine powder is selected from any one or a mixture of any two of silica fume, zeolite ultrafine powder and superfine rice hull ash, and the specific surface area of the filling ultrafine powder is more than 15000m 2 /kg; the dispersive superfine powder is a mixture of at least two of superfine fly ash, superfine limestone powder, silica micropowder, glass powder, superfine mineral powder and metakaolin, and the average grain size of the dispersive superfine powder is 2-15 mu m.
The nanomaterial shown in table 1 above may be any one or a mixture of any two of nanosilica, carbon nanofibers, carbon nanotubes, and nanosilica oxides.
Thus, the ultra-high strength cement-based grouting material with adjustable volume weight and elastic modulus is prepared through the synergistic effect of framework design, cementing material matching and interface improvement. The cement-based grouting material has initial fluidity not less than 280mm, compressive strength greater than 150MPa, flexural strength greater than 22MPa after water curing at 20deg.C for 28 days, and volume weight controlled at 2400kg/m when its static elastic modulus is in the range of 50 GPa-60 GPa 3 ～2900kg/m 3 Within a range of (2).
Specifically, the cement-based grouting material of the present invention achieves the above effects by the following principle and action:
first, in terms of skeleton design. According to the differences of the chemical compositions and the volume densities of the aggregates, the aggregate types are divided into three types of low-density aggregates (yellow sand and quartz sand), medium-density aggregates (limestone and basalt) and high-density aggregates (alumina, corundum, white corundum, brown corundum and silicon carbide); the aggregate particle size comprises three grades of not more than 1.18mm, 1.18 mm-2.36 mm and 2.36 mm-4.75 mm; the high-density aggregate mainly plays roles of enhancing the skeleton and improving the rigidity of the matrix, the low-density aggregate mainly plays roles of adjusting the volume weight of slurry and improving the fluidity, and the medium-density aggregate has both roles. When designing the aggregate, two or more aggregate types in the three aggregate types are selected according to the technical requirements of the elastic modulus and the slurry volume weight, and based on the principle of closest packing, the optimal proportion and the particle size of various aggregate types are optimized to obtain the minimum packing void ratio and the optimal fluidity, and simultaneously, the indexes of the elastic modulus and the slurry volume weight are realized.
Then, in the aspect of preparing the ultra-high strength grouting material. The requirement of large flow state and ultra-high strength performance index can not be met by simply relying on aggregate system design, and the further optimization of the powder system synergistic effect is still required to realize the consideration of rheological and mechanical properties. The filling ultrafine powder is introduced, the hydration reaction activity is higher, the secondary hydration reaction process of a gel system is promoted, the optimal close packing effect is easier to obtain due to the smaller micro-nano particle size, the defect of a matrix microstructure can be filled, the water absorption thickening effect is realized due to the larger specific surface area, and the bone paste separation possibly caused by a large flow state is avoided. In addition, the dispersible ultrafine powder mainly plays roles of viscosity reduction and dispersion and hydration heat release, the particle size of the dispersible ultrafine powder is between the silica fume of the filling ultrafine powder and cement, and proper introduction is beneficial to improving the flowing state and optimizing the particle size distribution of a cementing material system to further compact a matrix, and the chemical composition of the dispersible ultrafine powder mainly comprises silicon dioxide and aluminum oxide, so that the mixing amount of the dispersible ultrafine powder can play a role in adjusting the volume weight of slurry and the elastic modulus of the matrix.
And thirdly, adopting a nano material, and further filling the micro-structure gaps and promoting the hydration process of the cementing material and the nucleation crystallization of hydration products by utilizing the ultra-fine nano size, the ultra-high reactivity and the micro-nucleation effect of the nano material. In addition, the superfine powder dispersing agent improves the dispersibility of the nano material and superfine powder in the matrix, and reduces the internal defects caused by superfine particle agglomeration.
Finally, in terms of interface improvement. The medium-density aggregate and the high-density aggregate absorb water and are of porous structures, so that the medium-density aggregate plays an internal curing role in the hydration process of the matrix, and the higher surface roughness of the aggregate also increases the interfacial bonding strength. The micro-morphology of the filling ultrafine powder is porous micro-nano materials, on one hand, the ultrafine particle size of the filling ultrafine powder fills the defects of a matrix, on the other hand, the porous structure of the filling ultrafine powder absorbs part of free water in early hydration stage, the thickness of a water film layer on the surface of aggregate is reduced, the gradient difference of the water-gel ratio of the surface area of the aggregate is reduced, the porous channels of an interface are reduced, and along with the continuous hydration, the free water is released to promote hydration products to be further hydrated to form high-density products, so that the transition area of a weak interface is improved, and the compactness of the matrix is improved.
Further, the cement in table 1 may be Portland cement or Portland cement having a strength grade of 52.5 or more; the composite expansion component is a mixture of a plastic expansion agent and a multi-active hardening stage composite expansion agent, wherein the mass ratio of the plastic expansion agent to the multi-active hardening stage composite expansion agent is 1-1.8:100; wherein, the composite expanding agent in the multi-active hardening stage is formed by mixing high-activity MgO (the reaction time is less than or equal to 120 s), medium-activity MgO (the reaction time is 120 s-180 s) and low-activity MgO (the reaction time is 180 s-220 s); the defoamer is an organosilicon defoamer, such as a German Ming Ling chemical P803 powder defoamer; the superplasticizer is a polycarboxylic acid high-performance water reducer, the water reducing rate is not lower than 35%, for example, the superplasticizer can be produced by Jiangsu Su Bote New Material Co., ltd-300P powder polycarboxylic acid high-performance water reducer; the dispersing agent is a mixture of sodium tripolyphosphate and sodium hexametaphosphate in a mass ratio of 1:2.
The invention also provides an application method of the cement-based grouting material, namely, each powder component in the cement-based grouting material is uniformly mixed in a stirrer and then is directly mixed with water; generally, the water to material ratio is controlled to be 0.085:1 to 0.095:1.
The composition of the above cement-based grouting materials of the present invention will be embodied by specific examples, and the components and contents thereof of each cement-based grouting material in examples 1 to 5 are shown in table 2.
TABLE 2 Components and content wt% of Cement-based grouting materials in examples 1 to 5
The cements in examples 1 to 5 were P.II 52.5 Portland cement; the composite expansion components are a mixture of a plastic expansion agent and a multi-active hardening stage composite expansion agent, wherein the mass ratio of the plastic expansion agent to the multi-active hardening stage composite expansion agent is 1.5:100, and the multi-active hardening stage composite expansion agent is formed by mixing high-active MgO, medium-active MgO and low-active MgO, and the mass ratio of the high-active MgO to the medium-active MgO is 1:1; the defoamers are all German Ming Ling chemical P803 powder defoamers; the superplasticizers are all produced by Jiangsu Su Bote New Material Co., ltd-300P powder polycarboxylic acid high-performance water reducer; the dispersing agents are all mixtures of sodium tripolyphosphate and sodium hexametaphosphate in a mass ratio of 1:2.
The filler micropowder, the dispersing micropowder, the nanomaterial, and the sand in examples 1 to 5 are shown in tables 3 to 6, respectively.
TABLE 3 composition of the filled ultra-fine powders of examples 1-5
TABLE 4 composition of the dispersible ultrafine powders in examples 1-5
TABLE 5 composition of nanomaterial in examples 1-5
TABLE 6 composition of sand in examples 1-5
Note that: in Table 6, the first stage represents aggregate having a particle size of not more than 1.18mm, the second stage represents aggregate having a particle size of 1.18mm to 2.36mm, and the third stage represents aggregate having a particle size of 2.36mm to 4.75 mm.
In order to verify the excellent performance of the above cement-based grouting material of the present invention, the following comparative experiments were performed. The comparative experiment was based on the components of the cement-based grouting material in the above example 3, and the composition of sand was changed, and the filling ultra-fine powder, the dispersing ultra-fine powder, the nano material, i.e., the dispersant was absent, and the absent mass was supplemented to the content of cement, respectively. The compositions and contents of comparative examples 1 to 5 obtained in the respective examples are shown in Table 7.
Table 7 comparative cement-based grouting materials of comparative examples 1 to 5 were composed of the following components in wt%
The composition of the sand in comparative example 1 above was different from that of example 3 in that: the sand in this comparative example was all normal yellow sand, not the aggregate of different densities and grain size grading as in example 3.
The cement-based grouting materials obtained in examples 1 to 5 and the comparative cement-based grouting materials obtained in comparative examples 1 to 5 were mixed with water according to a water-to-material ratio of 0.092:1, and the volume weight, fluidity, flexural strength, compressive strength and static elastic modulus of the slurries were respectively tested. The fluidity, flexural strength and compressive strength test method refers to GB/T50448 application technical Specification of cement-based grouting materials, the slurry volume weight test method refers to GB/T50080-2016 Standard of common concrete mixture Performance test method, and the static elastic modulus test method refers to GB/T50081-2002 Standard of common concrete mechanical Performance test method.
The results of the performance tests of the cement-based grouting materials of examples 1 to 5 and the comparative cement-based grouting materials of comparative examples 1 to 5 are shown in Table 8.
TABLE 8 test results for Cement-based grouting materials in examples 1 to 5 and comparative cement-based grouting materials in comparative examples 1 to 5
From the data of examples 1-5 in Table 8, it can be seen that the cement-based grouting material provided by the invention can achieve performance indexes of large flow state, ultrahigh strength, and both volume weight and elastic modulus in 28d curing without fiber reinforcement standard.
Comparing the data of comparative examples 1-5 in Table 8 with the data of example 3, respectively, it can be seen that the comparative cement grouting material in comparative example 1 has better fluidity and small volume weight of the grouting material, but the mechanical properties are significantly lower than those of the cement-based grouting material in example 3; the concrete formulation rules of the visible sand have great influence on the mechanical properties of the finally obtained cement-based grouting material. The comparative example 2 lacks the filling ultrafine powder, the filling ultrafine powder has higher hydration reaction activity, promotes the secondary hydration reaction process of a gelation system, and the smaller micro-nano particle size is easier to obtain the optimal close packing effect and can fill the defect of the microstructure of the matrix, and the larger specific surface area ensures that the filling ultrafine powder has the functions of absorbing water and thickening, so that bone paste separation possibly caused by large flow state is avoided; therefore, the fluidity of the contrast tobias-based grouting material obtained after the filling ultrafine powder is lacking is obviously increased, namely the risk of bone paste separation is increased, and the compressive strength, the flexural strength and the elastic modulus are reduced to different degrees. The lack of the dispersible ultrafine powder in the comparative example 3 mainly plays roles of viscosity reduction dispersion and hydration heat release reduction, is beneficial to improving the flowing state and optimizing the grain composition of a cementing material system to further compact a matrix, and plays roles of adjusting the volume weight of slurry and the elastic modulus of the matrix; the fluidity of the comparative cement-based grouting material obtained after the lack of the dispersible ultrafine powder is deteriorated, the viscosity is increased, the pumping construction is not facilitated, and the elastic modulus is also reduced. The absence of nanomaterial in comparative example 4 has much lower compressive and flexural strength than example 3; the nano material further fills the micro-structure gaps, promotes the hydration process of the cementing material and the nucleation crystallization of hydration products due to the ultra-small nano size, the ultra-high reactivity and the micro-nucleation effect, and the mechanical property of the contrast cement-based grouting material obtained after the nano material is lacking is reduced. In comparative example 5, the dispersing agent is absent, the dispersing agent improves the dispersibility of the nano material and two types of ultrafine powder (filler ultrafine powder and dispersing ultrafine powder) in the matrix, internal defects caused by agglomeration of ultrafine particles are reduced, and performance data show that the fluidity and mechanical properties of the comparative cement-based grouting material obtained after the dispersing agent is absent are comprehensively reduced, the internal defects are formed by easy agglomeration of the ultrafine powder in the matrix, free water cannot be released due to the agglomeration of the ultrafine powder, the viscosity of the slurry is increased, the air content is increased, and the mechanical properties are further reduced.
Therefore, the cement-based grouting material achieves the effect of further considering the adjustable volume weight and the adjustable elastic modulus on the premise of ensuring the fluidity and the ultra-high strength through the synergistic effect of skeleton design, cementing material matching and interface improvement, and the components are mutually influenced in collocation, but do not exist independently.
While the invention has been shown and described with reference to certain embodiments, those skilled in the art will appreciate that: various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (7)
1. A cement-based grouting material for an offshore wind power jacket is characterized in that the initial fluidity of the cement-based grouting material is not less than 280mm, the compressive strength of the cement-based grouting material after 28 days of water culture at 20 ℃ is greater than 150MPa, the flexural strength of the cement-based grouting material is greater than 22MPa, the static elastic modulus is 50 GPa-60 GPa, and the volume weight is 2400kg/m 3 ～2900kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Comprises the following components in percentage by mass:
wherein the sand is selected from at least two of low-density aggregate, medium-density aggregate and high-density aggregate, and is continuously graded within the three-level grain diameter range of not more than 1.18mm, 1.18 mm-2.36 mm and 2.36 mm-4.75 mm; the low-density aggregate is yellow sand and/or quartz sand, the medium-density aggregate is limestone and/or basalt, and the high-density aggregate is at least one of alumina, corundum, white corundum, brown corundum and silicon carbide; the maximum grain diameter of the sand is less than 4.75mm, and the volume density is 2.5g/cm 3 ～3.9g/cm 3 The water absorption rate is not more than 4%; the specific surface area of the filling ultrafine powder is more than 15000m 2 The filling ultrafine powder is selected from any one or a mixture of any two of silica fume, zeolite ultrafine powder and ultrafine rice hull ash; the average grain diameter of the dispersible ultrafine powder is 2-15 mu m, and the dispersible ultrafine powder is selected from a mixture of at least two of ultrafine fly ash, ultrafine limestone powder, silica micropowder, glass powder, ultrafine mineral powder and metakaolin.
2. The cement-based grouting material according to claim 1, wherein the nanomaterial is selected from any one or a mixture of any two of nano silicon dioxide, nano calcium carbonate, nano carbon fiber, carbon nano tube and nano metal oxide.
3. The cement-based grouting material according to claim 1, wherein the composite expansion component is a mixture of a plastic expansion agent and a multi-active hardening stage composite expansion agent in a mass ratio of 1-1.8:100; wherein the multi-active hardening stage composite expanding agent is formed by mixing high-active MgO, medium-active MgO and low-active MgO.
4. The cement-based grouting material of claim 1, wherein the defoamer is an organosilicon defoamer.
5. The cement-based grouting material of claim 1, wherein the superplasticizer is a polycarboxylic acid high-performance water reducer, and the water reduction rate is not lower than 35%.
6. The cement-based grouting material according to claim 1, wherein the dispersing agent is a mixture of sodium tripolyphosphate and sodium hexametaphosphate in a mass ratio of 1:2.
7. A method of using the cement-based grouting material as claimed in any one of claims 1 to 6, wherein the cement-based grouting material is directly mixed with water; wherein the water-material ratio is 0.085:1-0.095:1.
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| CN114591041B (en) * | 2022-03-21 | 2023-05-09 | 绍兴市水联管业有限公司 | Filling concrete formula for composite pipe fitting |
| CN116120003A (en) * | 2022-12-01 | 2023-05-16 | 武大巨成结构股份有限公司 | High-elastic modulus grouting material and preparation method thereof |
| CN115819049B (en) * | 2023-02-20 | 2023-05-02 | 呼和浩特市巨日特种化工建材有限公司 | Cement-based grouting material for mounting wind power foundation tower barrel base and preparation method thereof |
| CN117550870B (en) * | 2024-01-12 | 2024-04-02 | 中建材中岩科技有限公司 | Low-density grouting material for offshore wind power suction barrel and preparation method thereof |
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