CN113968703A - Offshore wind power floating type foundation C115-C140 ultrahigh-performance self-compacting concrete - Google Patents
Offshore wind power floating type foundation C115-C140 ultrahigh-performance self-compacting concrete 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
-
- 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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- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The invention discloses a marine wind power floating type foundation C115-C140 ultrahigh-performance self-compacting concrete, wherein each cubic concrete comprises the following components in parts by weight: 700-750 kg of cementing material, 675-800 kg of fine aggregate, 875-1010 kg of coarse aggregate, 7-16 kg of water reducing agent and 105-120 kg of water, wherein the total volume weight of the concrete is 2480-2530 kg/m3. According to the invention, the highest strength is 155MPa in 56 days and 163MPa in 90 days under standard culture, the lowest single-component cement dosage is 245kg, the emptying time of a rewinding cylinder is 4-8 s, the T500 flow rate is 5-10 s, the self-compaction filling property is above grade II, the adiabatic temperature rise is not more than 68.5 ℃, the self-shrinkage rate in 7 days is not more than 0.08%, the chlorine ion electric flux in 56 days is not more than 100 coulombs, the sulfate erosion resistance is more than KS240, the construction viscosity can be comparable with that of common C50 concrete, the comprehensive performance and the cost of the concrete are obviously superior to those of steel-doped fiber UHPC at the same level, the high-performance, green and low-carbon concepts are met, and the application value is wide in the fields of offshore wind power and onshore wind power.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to an ultrahigh-performance self-compacting concrete for offshore wind power floating foundations C115-C140.
Background
With the aggravation of global climate problems, the worldwide acquisition of clean energy and technical research pay more attention, the research and utilization of wind energy resource technology are earlier abroad, but the wind power technology starts later in China, and the land wind power application is far more than the sea. However, with the advancement of wind power technology and the influence of the national strategy of double carbon, the electricity price subsidy mode becomes the past mode, the defects of relatively low power generation, relatively small power generation capacity, occupied land, disturbance to residents, ecological balance disturbance and the like of onshore wind power gradually appear, more and more enterprises are put into the research of offshore wind power complete technology, and offshore wind power is the mainstream of future wind power industry under the background of double carbon.
The offshore wind power foundation is divided into a fixed type and a floating type. The fixed common types comprise single pile type, multi-pile type, gravity type, suction anchor type and the like, and can only be applied to sea areas with medium water depth (0-30 m), in addition, the weight of the whole fan is limited by the form of seabed foundation, the whole fan is not only difficult to be suitable for large megawatt fans, but also great test is brought to construction cost and service life; the floating type fan is expected to be suitable for deep sea (more than 50m) and large megawatt fans through scientific design and rigorous calculation, is still explored at present in China, and belongs to the top technology of the wind power industry.
The floating foundation applied to the floating fan is a super-high-strength high-performance self-compacting concrete prefabricated part which is not doped with fibers and has more than C100/115 grade, the basic part is huge in size, complex in reinforcement arrangement and strong in marine ion erosion resistance, the design of the concrete mixing proportion should be combined with the key technical requirements of super-high-strength concrete, marine concrete, large-volume concrete and self-compacting concrete, and the prepared concrete should have multiple performances of low viscosity, low heat, low shrinkage, super-high strength, high crack resistance and high durability. Due to the difference of the sizes of test pieces in the middle and European technical standards, for the convenience of understanding, the European C100/115 concrete grade can be basically understood as domestic C115 (cube 150mm multiplied by 150mm), while the domestic UHPC technical standard T/CBMF37-2018 defines the strength grade of UHPC based on the test piece of cube 100mm multiplied by 100mm, and the size coefficient of the test piece of cube 150mm multiplied by 150mm is considered as 1.0. However, if the steel fiber is removed, the influence factor of the size factor is complicated and less than 1.0. Therefore, the concrete is C120 or more (the dimensional coefficient is converted to 0.95) when it is converted into a test piece of cube 100mm X100 mm.
At present, domestic C120 and above concrete is mainly applied to bridge deck pavement and various small-sized prefabricated decorative members, the concrete is generally called UHPC (fiber reinforced cement-based composite), but if the reinforcing effect of steel fibers is not considered, the actual strength of the concrete is reduced by about 20-30 MPa. In addition, they do not consider the problems of hydration heat and construction, shrinkage crack control and practical durability of the huge member in a complicated erosion environment, which are caused by a bulky structure. Although the strength of UHPC for paving the bridge deck doped with a large amount of steel fibers is generally as high as C120 or above, the UHPC has the thickness of less than 10cm, generally has the characteristics of high viscosity, slow flow rate, huge shrinkage and hydration temperature rise of more than 80 ℃, and limits the wide application of the material in huge and large-volume members. Therefore, the method solves the contradiction between the ultrahigh strength and the superfluid state under the condition of no fiber doping, the contradiction between the ultrahigh strength and the hydration temperature rise, the contradiction between the ultrahigh strength and the volume stability of shrinkage, the contradiction between the ultrahigh strength and the durability of complex erosion and the contradiction between the ultrahigh strength and large-volume construction, and is a key technology for successfully preparing the concrete.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an offshore wind power floating type foundation C115-C140 ultrahigh-performance self-compacting concrete, which has the highest strength of 155MPa for 56 days and 163MPa for 90 days under standard culture, the emptying time of a reverse cylinder of 4-8 s and T500The flow velocity is 5-10 s, the self-compaction filling property is more than II grade, the adiabatic temperature rise is not more than 68.5 ℃, the 7-day self-shrinkage rate is not more than 0.08%, the 56-day chlorine ion electric flux is not more than 100 coulombs, the sulfate erosion resistance reaches more than KS240, the construction viscosity can be comparable to that of common C50 concrete, the comprehensive performance and the cost of the concrete are obviously superior to those of the steel fiber-doped UHPC of the same grade, and the concrete has wide application value in the fields of offshore wind power and onshore wind power.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: the offshore wind power floating type foundation C115-C140 ultrahigh-performance self-compacting concrete comprises the following components in parts by weight: 700-750 kg of cementing material, 675-800 kg of fine aggregate, 875-1010 kg of coarse aggregate, 7-16 kg of water reducing agent and 105-120 kg of water, wherein the total volume weight of the concrete is 2480-2530 kg/m3(ii) a Wherein:
the cementing material consists of cement and high-activity ultrafine powder, wherein the cement accounts for 35-50% of the total mass of the cementing material;
the fine aggregate is sand with the particle size of 0-5 mm, and is at least one of natural river sand and machine-made sand;
the coarse aggregate is stone with the particle size of 5-16 mm, and is one of basalt, diabase and tuff;
the water reducing agent is a viscosity reduction type high-concentration polycarboxylic acid water reducing agent.
Preferably, the cement is P.O 52.5 cement; the high-activity superfine powder is a mixture consisting of fly ash micro-beads and superfine mineral powder or one of the fly ash micro-beads, the superfine mineral powder and silica fume.
Preferably, each cubic concrete comprises the following components in parts by weight: 245-350 kg of cement, 210-245 kg of fly ash microbeads, 140-210 kg of superfine mineral powder, 675-800 kg of 0-5 mm sand, 350-404 kg of 5-10 mm stones, 565-606 kg of 10-16 mm stones, 7-11 kg of water reducing agent and 105-110 kg of water, wherein the total volume weight of the concrete is 2480-2500 kg/m3。
Preferably, each cubic concrete comprises the following components in parts by weight: 245-355 kg of cement, 175-245 kg of fly ash microbeads, 112-182 kg of superfine mineral powder, 28-45 kg of silica fume, 675-760 kg of 0-5 mm sand, 350-404 kg of 5-10 mm stones, 555-606 kg of 10-16 mm stones, 9-16 kg of water reducing agent, 105-120 kg of water and 2490-2530 kg/m of total concrete volume weight3。
Preferably, the water consumption for the standard consistency of the cement is not more than 28.0 percent, and the specific surface area is not more than 380m2Per kg, 3-day compressive strength of not less than 33MPa, 28-day compressive strength of not less than 58MPa, C3A content is not more than 8.0%, and heat of hydration is not more than 300J/3 daysg。
Preferably, the median diameter of the fly ash micro-beads is less than 3 μm, the water demand ratio is less than 90%, the loss on ignition is less than 1.0%, the total content of alumina and silica is not less than 80%, the activity in 7 days is more than 80%, the activity in 28 days is more than 105%, and the standard cement of the activity index is P.O 52.5.
Preferably, the specific surface area of the superfine mineral powder is more than 600m2The median diameter is less than 10 mu m, the activity in 7 days is more than 100 percent, the activity in 28 days is more than 115 percent, and the standard cement of the activity index is P.O 52.5.
Preferably, the specific surface area of the silica fume is more than 18000m2The cement has a median diameter of less than 0.5 mu m, a silicon oxide content of more than 90 percent, an activity of more than 100 percent in 7 days, an activity of more than 115 percent in 28 days, and P.O 52.5 as a reference cement of an activity index.
Preferably, the fineness modulus of the fine aggregate is 2.5-2.9, the grading is in a zone II, the content of 0.15-0.3 mm particles is 5-15%, and the close packing void ratio is not more than 40%; wherein the mud content of the natural river sand is less than 1.0 percent, the crushing index of the particles with the diameter of more than 1.18mm is less than 20 percent, the content of the machine-made sand mud powder is less than 7.0 percent, and the crushing index of the particles with the diameter of more than 1.18mm is less than 15 percent.
Preferably, the compression strength of the mother rock of the coarse aggregate is more than 150MPa, the mud content is less than 1.0%, the crushing index of 5-10 mm is not more than 7.0%, the crushing index of 10-16 mm is not more than 6.0%, and the needle sheet content is not more than 3.0%.
Preferably, the solid content of the viscosity-reducing high-concentration polycarboxylate superplasticizer is more than 28%, the emptying time of a concrete pouring cylinder is not more than 8s, the gas content of the concrete is not more than 2.0%, and the static loss of the 2h expansion degree is not more than 50 mm.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention provides an offshore wind power floating type foundation C115-C140 ultrahigh-performance self-compacting concrete which comprises cement, high-activity ultrafine powder, coarse aggregate, fine aggregate, tap water and a polycarboxylic acid water reducing agent. In order to ensure the strength of concrete and control hydration heat and shrinkage, high-activity ultrafine powder, particularly fly ash micro-beads are introduced into the components, the high volcanic ash activity, the excellent spherical shape effect, the submicron filling effect, the hydration process delay and the physicochemical characteristics of reducing the hydration temperature rise and the hydration rate of the fly ash micro-beads are fully utilized, the heat release and shrinkage rules of ultrafine mineral powder and silica fume are regulated, the powder particles are formed based on a specific model and are most closely matched in a gradient manner, and under the concept of 'big' cementing material and the principle of extremely low water-to-gel ratio, the highest adiabatic temperature rise of a system is reduced by about 20 ℃ while the strength of the concrete is not reduced. Meanwhile, the application of the large mineral admixture technology realizes the application of the ultra-high strength concrete with low cement consumption, effectively improves the micro-pore structure and compactness of a gelled system, and ensures that the concrete strength can be developed sustainably, thereby not only obviously reducing the self-shrinkage of about 2/3, but also improving the anti-erosion capability to a certain extent, and meeting the high-performance technical requirements and the green low-carbon concept of marine concrete and mass concrete.
The fly ash micro-bead provided by the invention also has excellent thixotropy, extremely low water requirement and adsorbability, the particle distribution of the fly ash micro-bead can well fill gaps of cement particles, more free water is released, and in addition, the viscosity of concrete can be further reduced under the condition of good particle step matching with other superfine powder; although the superfine mineral powder has high early strength and high activity, the specific surface area is large, the superfine mineral powder is polygonal and has angles, the internal shearing force and early self-shrinkage of the slurry can be obviously increased under large mixing amount, the superfine mineral powder and the slurry are reasonably matched, the external flexibility and cohesion of the concrete slurry can obviously reduce the self-shrinkage of the cement stone while reducing the hydration heat, and the important guarantee of the self-compactness of the mixture under low viscosity is realized; the silica fume as a compact filler or viscosity-reducing thickener can further reduce the system viscosity, improve the compactness and the durability, and is particularly favorable for preparation by using full-machine-made sand.
The coarse and fine aggregates provided by the invention are calculated, optimized and adjusted by using a tight stack prediction model established based on a mathematical statistics method, and the minimum void ratio stacking of the coarse and fine aggregates is realized while the optimal working performance of concrete is met.
The offshore wind power floating type foundation C115-C140 ultrahigh-performance self-compacting concrete provided by the invention provides the mixing proportion of 2 different gelling systems, and is suitable for preparing all-natural river sand and all-machine-made sand. The prepared concrete has the maximum strength of 56 days 155MPa and 90 days 163MPa under standard cultivation, the emptying time of an inverted cylinder is 4-8 s, the T500 flow rate is 5-10 s, the self-compaction filling property is more than II level (the filling time of 5 grid U-shaped boxes is 15-20 s), the adiabatic temperature rise is not more than 68.5 ℃, the self-shrinkage rate of 7 days is not more than 0.08%, the durability index is not lower than the same grade UHPC, the static elastic modulus is not lower than 45GPa, the construction viscosity can be comparable with that of common C50 concrete, and the working performance is not lost basically in 2 h.
The offshore wind power floating type foundation C115-C140 ultrahigh-performance self-compacting concrete provided by the invention is ultrahigh-strength green concrete with a volume, which is suitable for a non-steam-cured environment, is different from the characteristics of rapid development of early strength and slow development of later strength of a conventional UHPC (ultra high performance concrete), and the strength grade is suitable for evaluation in an age period of at least 56 days. The maximum strength increases of about 30MPa, 15MPa and 10MPa in standard culture for 7 to 28 days, 28 to 56 days and 56 to 90 days respectively.
Based on the tightest packing concept, the invention applies the concept of 'big' cementing material and the technology of large mineral admixture, breaks through the technical bottleneck of high viscosity, high heat, high shrinkage and high crack of the conventional non-fiber-doped UHPC, realizes multiple performances of super-flow state, low viscosity, low heat, low shrinkage, high crack resistance and the like of the ultra-high-strength concrete with the strength of more than C100, achieves the maximum strength of 146MPa within 28 days, 155MPa within 56 days and 163MPa within 90 days under standard culture, achieves C115-C140 (achieves C115-C130 under 56d evaluation, achieves C120-C140 under 90d evaluation), has the durability not lower than the UHPC of the same level, meets the high-performance technical requirements of marine concrete, large-volume concrete and self-compacting concrete, can be applied to a wind power type foundation structure with dense reinforcement in a steam-culture or non-steam-culture environment and offshore wind power type tower barrel components with the same level and has wide application value.
According to the invention, the single-component cement dosage is 35-50%, the lowest single-component dosage is only 245kg, the standard curing strength in 56 days can still reach 137MPa, the same-condition strength is 145.7MPa, the concrete strength can be continuously developed within 120 days or longer, and the high-performance, green and low-carbon concepts are met.
The invention successfully provides a low-heat cementing system based on the hydration heat regulation and control of the cementing material by the large-volume fly ash microbead technology, the adiabatic temperature rise of the concrete is not more than 68.5 ℃, and the temperature is reduced by about 12-20 ℃ compared with that of the same-grade UHPC, so that the cracking risk is reduced;
the shrinkage-reducing agent, the high-performance expanding agent, the micron-sized super absorbent resin and other high-strength porous materials are not adopted for auxiliary shrinkage reduction, the delayed hydration and shrinkage regulation and control characteristics of the high-doped high-activity superfine powder are utilized, the concrete porosity is optimized based on the powder compact stacking and aggregate compact stacking model, the total gel amount is reduced, the self-shrinkage rate of 7 days with an extremely low water-gel ratio is not more than 0.08 percent and is 20-50 percent of the self-shrinkage rate of the same-grade conventional UHPC, and the problems of high cost, unstable actual expansion effect of the expanding agent, complicated porous material pretreatment, influence on compressive strength and workability and the like existing in the shrinkage-reducing measures are solved.
Based on the physicochemical characteristics of high water reduction, high thixotropy and high early and later stage activity of the fly ash microbeads, the superfine powder particles formed by using a specific model are closely matched in a gradient manner, a silica fume multielement gelation system can be replaced, the compactness which is not inferior to that of the silica fume system and the viscosity reduction effect which is more excellent than that of the silica fume are realized, the concrete can be rapidly discharged in a state of 40-60 s, the problems of difficult dispersion of the gelation components of the ultra-high strength concrete, long stirring time, high water reducing agent mixing amount, low flow rate and the like are solved, and the production and construction are facilitated.
Compared with the same-grade UHPC, the marine wind power floating type foundation C115-C140 ultrahigh-performance self-compacting concrete containing the coarse aggregate has the advantages of obvious cost advantage, easily obtained raw materials and higher stirring efficiency.
Drawings
Fig. 1 is a gradation diagram of 3 kinds of sands in which fineness moduli of river sand 1, river sand 2 and machine-made sand are 2.9, 2.7 and 2.6, respectively, in the example.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
In the following examples, the raw material parameters used are as follows:
the water consumption for the standard consistency of the cement is not more than 28.0 percent, and the specific surface area is not more than 380m2Per kg, 3-day compressive strength of not less than 33MPa, 28-day compressive strength of not less than 58MPa, C3The content of A is not more than 8.0 percent, and the heat of hydration in 3 days is not more than 300J/g.
The high-activity superfine powder is a mixture of fly ash micro-beads, superfine mineral powder or fly ash micro-beads, superfine mineral powder and silica fume. The median diameter of the fly ash micro-beads is less than 3 mu m, the water demand ratio is less than 90%, the ignition loss is less than 1.0%, the total content of alumina and silica is not less than 80%, the activity in 7 days is more than 80%, the activity in 28 days is more than 105%, and the standard cement of the activity index is P.O 52.5.
The specific surface area of the superfine mineral powder is more than 600m2The median diameter is less than 10 mu m, the activity in 7 days is more than 100 percent, the activity in 28 days is more than 115 percent, and the standard cement of the activity index is P.O 52.5.
The specific surface area of the silica fume is more than 18000m2The cement has a median diameter of less than 0.5 mu m, a silicon oxide content of more than 90 percent, an activity of more than 100 percent in 7 days, an activity of more than 115 percent in 28 days, and P.O 52.5 as a reference cement of an activity index.
The fineness modulus of the fine aggregate is 2.5-2.9, the gradation is a zone II, the content of 0.15-0.3 mm particles is 5-15%, and the close packing void ratio is not more than 40%. Wherein the mud content of the natural river sand is less than 1.0 percent, the crushing index of the particles with the diameter of more than 1.18mm is less than 20 percent, the content of the machine-made sand mud powder is less than 7.0 percent, and the crushing index of the particles with the diameter of more than 1.18mm is less than 15 percent.
The compression strength of the coarse aggregate parent rock is more than 150MPa, the mud content is less than 1.0%, the crushing index of 5-10 mm is not more than 7.0%, the crushing index of 10-16 mm is not more than 6.0%, and the needle sheet content is not more than 3.0%.
The solid content of the viscosity-reducing high-concentration polycarboxylate superplasticizer is more than 28%, the emptying time of a concrete pouring cylinder is not more than 8s, the gas content of the concrete is not more than 2.0%, and the static loss of the 2h expansion degree is not more than 50 mm.
Examples 1 to 9 are C115-C140 concrete using fly ash micro-beads and ultrafine mineral powder as high-activity ultrafine powder, and single-component cement admixture 35% [ mu ] EThe fineness modulus of 50 percent of the river sand 1, the river sand 2 and the machine-made sand are respectively 2.9, 2.7 and 2.6, and the grading conditions of 3 kinds of sand are shown in figure 1. The specific mixing ratio is shown in Table 1, and the unit of each component is kg/m3The water reducing agents used are the same. The specific working properties and standard curing compressive strength are shown in table 2. The test mold size for the compressive strength is a cube 100mm × 100mm × 100mm plastic mold, and the final strength is converted into a cube 150mm × 150mm × 150mm, and multiplied by a dimensional coefficient of 0.95.
TABLE 1
TABLE 2
Examples 10 to 14 are C115 to C140 concrete using fly ash micro beads, ultrafine mineral powder and silica fume as high-activity ultrafine powder, the single-component cement mixing amount is 35% to 50%, the fineness modulus of machine-made sand and river sand is 2.6 and 2.7, respectively, the gradation curve is shown in fig. 1, and the used river sand is river sand 2 in examples 1 to 9. The specific mixing ratio is shown in Table 3, and the unit of each component is kg/m3The water reducing agents used are the same. The specific working properties and standard curing compressive strength are shown in table 4. The dimensions and materials of the test mold for compressive strength were the same as those of examples 1 to 9.
TABLE 3
TABLE 4
The durability test results of some of the above examples 1-14 are shown in Table 5.
TABLE 5
The concrete with the compressive strength of 140-163 MPa for 90 days can be prepared according to the mixing ratio provided by the embodiments 1-14, the C115-C140 level is achieved, the fluidity, viscosity, flow rate, self-shrinkage and adiabatic temperature rise of the concrete mixture are all obviously superior to those of UHPC of the same level, and the ultra-high strength under ultra-low cement consumption is realized. The matching scheme of the high-activity ultrafine powder shows that the silica fume is not a necessary technical means for realizing the ultrahigh strength of the concrete, and the strength of a silica fume-free system is better than that of a silica fume-containing system under standard culture conditions, so that the conventional understanding that the silica fume is mixed in the ultrahigh-strength concrete is broken. Meanwhile, the contradiction between ultrahigh strength and superfluid, low viscosity, low heat, low shrinkage and high crack resistance is successfully solved.
The above examples are only for illustrating the technical solutions of the present invention and are not limited, and those skilled in the art can make changes and modifications to the technical solutions without departing from the technical solutions and formulation ideas of the present invention, and also fall into the protection scope of the present invention.
Claims (11)
1. The offshore wind power floating type foundation C115-C140 ultrahigh-performance self-compacting concrete is characterized in that each cubic concrete comprises the following components in parts by weight: 700-750 kg of cementing material, 675-800 kg of fine aggregate, 875-1010 kg of coarse aggregate, 7-16 kg of water reducing agent and 105-120 kg of water, wherein the total volume weight of the concrete is 2480-2530 kg/m3(ii) a Wherein:
the cementing material consists of cement and high-activity ultrafine powder, wherein the cement accounts for 35-50% of the total mass of the cementing material;
the fine aggregate is sand with the particle size of 0-5 mm, and is at least one of natural river sand and machine-made sand;
the coarse aggregate is stone with the particle size of 5-16 mm, and is one of basalt, diabase and tuff;
the water reducing agent is a viscosity reduction type high-concentration polycarboxylic acid water reducing agent.
2. The offshore wind power floating foundation C115-C140 ultrahigh-performance self-compacting concrete according to claim 1, wherein the cement is P.O 52.5 cement; the high-activity superfine powder is a mixture consisting of fly ash micro-beads and superfine mineral powder or one of the fly ash micro-beads, the superfine mineral powder and silica fume.
3. The offshore wind power floating foundation C115-C140 ultrahigh-performance self-compacting concrete according to claim 2, wherein each cubic concrete comprises the following components by weight: 245-350 kg of cement, 210-245 kg of fly ash microbeads, 140-210 kg of superfine mineral powder, 675-800 kg of 0-5 mm sand, 350-404 kg of 5-10 mm stones, 565-606 kg of 10-16 mm stones, 7-11 kg of water reducing agent and 105-110 kg of water, wherein the total volume weight of the concrete is 2480-2500 kg/m3。
4. The offshore wind power floating foundation C115-C140 ultrahigh-performance self-compacting concrete according to claim 2, wherein each cubic concrete comprises the following components by weight: 245-355 kg of cement, 175-245 kg of fly ash microbeads, 112-182 kg of superfine mineral powder, 28-45 kg of silica fume, 675-760 kg of 0-5 mm sand, 350-404 kg of 5-10 mm stones, 555-606 kg of 10-16 mm stones, 9-16 kg of water reducing agent, 105-120 kg of water and 2490-2530 kg/m of total concrete volume weight3。
5. The offshore wind power floating foundation C115-C140 super defined in claim 1The high-performance self-compacting concrete is characterized in that the water consumption of the standard consistency of the cement is not more than 28.0 percent, and the specific surface area is not more than 380m2Per kg, 3-day compressive strength of not less than 33MPa, 28-day compressive strength of not less than 58MPa, C3The content of A is not more than 8.0 percent, and the heat of hydration in 3 days is not more than 300J/g.
6. The offshore wind power floating type foundation C115-C140 ultrahigh-performance self-compacting concrete according to claim 2, wherein the median diameter of the fly ash micro-beads is less than 3 μm, the water demand ratio is less than 90%, the loss on ignition is less than 1.0%, the total content of alumina and silica is not less than 80%, the activity in 7 days is greater than 80%, the activity in 28 days is greater than 105%, and the standard cement of the activity index is P.O 52.5.
7. The offshore wind power floating foundation C115-C140 ultrahigh-performance self-compacting concrete as claimed in claim 2, wherein the specific surface area of the ultrafine mineral powder is more than 600m2The median diameter is less than 10 mu m, the activity in 7 days is more than 100 percent, the activity in 28 days is more than 115 percent, and the standard cement of the activity index is P.O 52.5.
8. The offshore wind power floating foundation C115-C140 ultrahigh-performance self-compacting concrete according to claim 2, wherein the specific surface area of the silica fume is more than 18000m2The cement has a median diameter of less than 0.5 mu m, a silicon oxide content of more than 90 percent, an activity of more than 100 percent in 7 days, an activity of more than 115 percent in 28 days, and P.O 52.5 as a reference cement of an activity index.
9. The offshore wind power floating foundation C115-C140 ultrahigh-performance self-compacting concrete as claimed in claim 1, wherein the fineness modulus of the fine aggregate is 2.5-2.9, the gradation is zone II, the content of 0.15-0.3 mm particles is 5-15%, and the close packing void ratio is not more than 40%; wherein the mud content of the natural river sand is less than 1.0 percent, the crushing index of the particles with the diameter of more than 1.18mm is less than 20 percent, the content of the machine-made sand mud powder is less than 7.0 percent, and the crushing index of the particles with the diameter of more than 1.18mm is less than 15 percent.
10. The offshore wind power floating foundation C115-C140 ultrahigh-performance self-compacting concrete according to claim 1, wherein the compression strength of mother rock of the coarse aggregate is more than 150MPa, the mud content is less than 1.0%, the crushing index of 5-10 mm is not more than 7.0%, the crushing index of 10-16 mm is not more than 6.0%, and the needle sheet content is not more than 3.0%.
11. The offshore wind power floating foundation C115-C140 ultrahigh-performance self-compacting concrete according to claim 1, wherein the solid content of the viscosity-reducing high-concentration polycarboxylate superplasticizer is greater than 28%, the emptying time of a concrete pouring cylinder is not greater than 8s, the gas content of the concrete is not greater than 2.0%, and the static loss of the 2h expansion degree is not greater than 50 mm.
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