CN112110689A - Ultrahigh-strength high-performance concrete and preparation method thereof - Google Patents
Ultrahigh-strength high-performance concrete and preparation method thereof Download PDFInfo
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- C03—GLASS; MINERAL OR SLAG WOOL
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- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/1025—Coating to obtain fibres used for reinforcing cement-based products
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- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
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- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/465—Coatings containing composite materials
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/46—Rock wool ; Ceramic or silicate fibres
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- C04B14/4656—Al-silicates, e.g. clay
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- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
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- C04B20/023—Chemical treatment
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
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- 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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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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]
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Abstract
The application relates to the field of building materials, in particular to ultrahigh-strength high-performance concrete and a preparation method thereof. The ultrahigh-strength high-performance concrete is mainly prepared from the following components in parts by weight: the concrete comprises a cementing material, aggregate, an alkali activator, basalt fiber, a high-efficiency alkaline water agent and water; the cementing material comprises the following components in parts by weight: slag, cement, fly ash, and modified pyrophyllite; the modified pyrophyllite is prepared by modifying the surface of aminosilane coupling agent and pyrophyllite powder. The preparation method comprises the following steps: the raw materials are mixed and stirred to prepare uniform slurry. The ultrahigh-strength high-performance concrete has the advantage of improving the problem of large shrinkage rate of the ultrahigh-strength high-performance concrete.
Description
Technical Field
The application relates to the field of building materials, in particular to ultrahigh-strength high-performance concrete and a preparation method thereof.
Background
Ultrahigh-strength high-performance concrete is a novel fiber reinforced cement-based material developed in the last two decades, and has been widely applied to bridge engineering and high-rise buildings due to the ultrahigh mechanical property and durability.
Cracking of ultrahigh-strength high-performance concrete is a common phenomenon in concrete and is a problem which is often troubled in building construction. One of the reasons that ultrahigh-strength high-performance concrete is easy to crack is that the shrinkage rate of the ultrahigh-strength high-performance concrete is large.
Disclosure of Invention
In order to solve the problem of large shrinkage of ultrahigh-strength high-performance concrete, the application provides ultrahigh-strength high-performance concrete and a preparation method thereof.
In a first aspect, the present application provides an ultra-high strength high performance concrete, which adopts the following technical scheme:
the ultrahigh-strength high-performance concrete is mainly prepared from the following components in parts by weight:
35-60 parts of a cementing material;
28-90 parts of aggregate;
0.1-1 part of alkali activator;
5-18 parts of basalt fiber;
0.1-0.8 part of high-efficiency alkali water agent;
10-20 parts of water;
the cementing material comprises the following components in parts by weight: 5-13 parts of slag, 16-35 parts of cement, 2-9 parts of fly ash and 2-10 parts of modified pyrophyllite; the modified pyrophyllite is prepared by modifying the surface of aminosilane coupling agent and pyrophyllite powder.
By adopting the technical scheme, the most reason for causing the high shrinkage rate of the concrete is chemical shrinkage, the chemical shrinkage is caused by the fact that the product volume after hydration reaction is smaller than the reaction volume, and the chemical shrinkage is relieved mainly from the perspective of a gelled material. According to the method, pyrophyllite powder is added into a cementing material, and the pyrophyllite powder can slowly lose water in the hydration reaction process after being wetted with water by utilizing the characteristics of a cementing hole frame structure, more pores, large specific surface area and the like, so that the hydration reaction is replenished, and the influence of the hydration reaction on the volume of a reactant is improved. However, because the pyrophyllite lacks plasticity, the pyrophyllite powder needs to be modified by an aminosilane coupling agent, so that the activity of the pyrophyllite powder can be improved, the toughness of the pyrophyllite powder can be improved, the mechanical properties of the concrete such as bending resistance, tensile strength and the like can be improved, the shrinkage performance of the concrete can be improved, and the mechanical properties of the concrete can be improved.
Secondly, basalt fibers are used for replacing steel fibers in the related technology, and the obtained concrete is high in performance in the aspects of breaking strength and tensile strength. Moreover, under the direct action of the high-efficiency water reducing agent, the water content of the system can be greatly reduced, and on the basis, the cement-based material is doped with the disorderly distributed basalt fibers, so that the flexural strength, the toughness and the crack resistance of the concrete can be further improved.
Preferably, the modified pyrophyllite is prepared by the following steps:
pretreating an aminosilane coupling agent, adding water into 0.5-1 part of the aminosilane coupling agent, performing ultrasonic oscillation, and adding 0.1 part of absolute ethyl alcohol for dilution to obtain a surface modifier;
pre-treating pyrophyllite powder, grinding 50-60 parts of pyrophyllite powder for 1 hour at 800r/min under 500-;
and modifying the pyrophyllite powder by using an aminosilane coupling agent, slowly dripping a surface modifier into the pasty pyrophyllite powder while stirring at the temperature of 60-65 ℃, and continuously stirring for 60-90min to obtain the modified pyrophyllite powder.
By adopting the technical scheme, the pyrophyllite modified by the aminosilane coupling agent can be prepared by the method, so that the modified pyrophyllite with good tensile property is obtained.
Preferably, the basalt fiber is Al2O3The modified basalt fiber is prepared by the following steps:
1) 18-30 parts of Al2O3Placing the powder into water, ultrasonically dispersing for 45-90min, adjusting pH to 5-6, adding 0.5-1 part of aminosilane coupling agent, stirring for 2-4h, centrifuging, cleaning with acetone, and standing at 60-80 deg.CDrying to obtain Al2O3；
2) Mixing 45-68 parts of basalt fiber, 10-25 parts of ethyl acetate and 8-12 parts of titanate coupling agent, and adding Al obtained in the step 1)2O3Stirring for 2-4h, filtering, and washing.
By adopting the technical scheme, the basalt fiber is a continuous fiber composed of oxides such as silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, iron oxide, titanium dioxide and the like. The experiment shows that Al is utilized2O3The basalt fiber is modified and then used in the preparation of concrete, and the shrinkage rate of the prepared concrete is reduced. Among the possible reasons are: by utilizing the characteristic of certain stretch resistance of the basalt fiber, when the solid granules can be supplemented to the position occupied by the original water after the hydration reaction of the cementing material, so that the concrete is integrally shrunk, the basalt fiber is stretched and expanded, thereby weakening the shrinking effect of the concrete. At the same time, since Al is utilized2O3After the basalt fiber is modified, Al on the surface of the basalt fiber2O3The content is increased and attached to the pores on the surface of the composite material to enable the surface of the composite material to be connected more tightly, so that the strength is maintained and the contractibility is reduced.
Preferably, the particle size of the pyrophyllite powder is 325-1000 meshes.
By adopting the technical scheme, the granularity of the pyrophyllite powder is within the range of 325-plus-1000 meshes, and the concrete with better mechanical property and lower contractibility can be prepared.
Preferably, the weight ratio of the cementing material to the aggregate is 1: (0.8-1.5).
By adopting the technical scheme, one reason for the large shrinkage of the ultrahigh-strength high-performance concrete is that the use amount of the cementing material is high, so that the bone-cement ratio is low, and tests show that the weight ratio of the cementing material to the aggregate is 1: (0.8-1.5), the prepared concrete is balanced in mechanical property and contractibility.
Preferably, the weight ratio of the cementing material to the aggregate is 1: 1.
by adopting the technical scheme, tests show that the weight ratio of the cementing material to the aggregate is 1:1, the prepared concrete has the best performance in the aspects of mechanical property and contractibility.
Preferably, the aggregate is prepared by mixing the following quartz sands with different grades in parts by weight: 5-20 parts of quartz sand A, 8-31 parts of quartz sand B and 15-39 parts of quartz sand C, wherein the granularity of the quartz sand A is 50-80 meshes, the granularity of the quartz sand B is 20-50 meshes, and the granularity of the quartz sand C is 10-20 meshes.
By adopting the technical scheme, the quartz sand A, the quartz sand B and the quartz sand C with different grading are mutually overlapped to construct a basic overlapped framework, the quartz sand C with thicker grain diameter forms the basic framework, the quartz sand B with medium grain diameter is filled in the gap of the quartz sand C and forms the middle framework, the quartz sand A with thinner grain diameter is filled in the gap of the quartz sand B, and the aggregates are piled up and matched with grains with different grading, so that the gaps among the quartz sand with different grain diameters can be mutually filled, and the piling compactness of solid grains can be greatly improved. Meanwhile, under the direct action of the high-efficiency water reducing agent, the water content can be greatly reduced, so that the material has higher stacking compactness, and the problem of high contractibility of concrete can be solved.
In a second aspect, the present application provides a method for preparing an ultra-high strength high performance concrete, which adopts the following technical scheme: a preparation method of ultrahigh-strength high-performance concrete comprises the following preparation steps: according to the weight portion, the cementing material, the aggregate, the alkali activator, the basalt fiber, the high-efficiency alkaline water agent and the water are mixed and stirred to prepare uniform slurry.
By adopting the technical scheme, the concrete can be obtained by mixing and stirring the raw materials, and the prepared concrete has the advantages of high mechanical property, greatly improved shrinkage performance, simple process steps and simple and convenient operation.
Preferably, the stirring speed is 300-400 r/min.
By adopting the technical scheme, experiments show that the concrete prepared at the stirring speed of 300-400 r/min has the best effect, if the stirring speed is too high, the effect of the alkali activator and the high-efficiency alkali water agent on solid particles can be damaged, and if the stirring speed is too low, the processing efficiency is too low, and the stirring effect is too poor.
In summary, the present application has the following beneficial effects:
1. modified pyrophyllite powder is added into a cementing material, and the pyrophyllite powder can slowly lose water in the hydration reaction process after being wetted with water by utilizing the characteristics of a cemented hole frame structure, more pores, large specific surface area and the like, so that the hydration reaction is replenished, and the influence of the hydration reaction on the volume of a reactant is improved. Meanwhile, the activity and toughness of the modified pyrophyllite powder are improved, so that the mechanical properties of the concrete such as bending resistance and the like are further improved, and the market value is improved.
2. The fatigue resistance and the durability of the concrete can be improved by adding the basalt fibers, and in addition, the concrete obtained by using the basalt fibers is higher in the aspects of breaking strength and tensile strength.
3. In the application, the weight ratio of the cementing material to the aggregate is preferably 1:1, the prepared concrete has better compressive strength and contractibility.
Detailed Description
The present application will be described in further detail with reference to examples.
Table 1 table of sources of raw materials in the following preparation examples, examples and comparative examples
| Raw materials | Model number | Business company |
| Amino silane coupling agent | DL602 | Shanghai Kayin chemical Co Ltd |
| Pyrophyllite powder | - | Hebei Hemiguang mineral products Co Ltd |
| Titanate coupling agent | TMC-105 | Guangzhou Zhongjie chemical technology Co Ltd |
| High-efficiency water reducing agent | FDN-C | Jinan Rong Guanghu chemical Co., Ltd |
| Basalt fiber | - | Changzhou city Bo super engineering materials Co Ltd |
Preparation example 1
The modified pyrophyllite powder is prepared by the following steps:
and (3) pretreating an aminosilane coupling agent, slowly dripping water into 0.5 part of the aminosilane coupling agent, performing ultrasonic oscillation until the solution is uniform, and adding 0.1 part of absolute ethyl alcohol for dilution to obtain the surface modifier.
Pretreating pyrophyllite powder, grinding 60 parts of pyrophyllite powder with the particle size of 325 meshes at 600r/min for 1h, adding water for wetting and uniformly mixing to obtain pasty pyrophyllite powder.
Modifying pyrophyllite powder with aminosilane coupling agent, slowly dripping surface modifier into the pasty pyrophyllite powder at 60 ℃, and continuously stirring for 60min to obtain the modified pyrophyllite powder.
Preparation example 2
The modified pyrophyllite powder is prepared by the following steps:
pretreating an aminosilane coupling agent, slowly dripping water into 1 part of the aminosilane coupling agent, performing ultrasonic oscillation until the solution is uniform, and adding 0.1 part of absolute ethyl alcohol for dilution to obtain the surface modifier.
Pre-treating pyrophyllite powder, grinding 50 parts of pyrophyllite powder with the particle size of 800 meshes for 1 hour at the speed of 500r/min, adding water for wetting and uniformly mixing to obtain pasty pyrophyllite powder.
Modifying pyrophyllite powder with aminosilane coupling agent, slowly dripping surface modifier into the pasty pyrophyllite powder at 65 ℃, and continuously stirring for 80min to obtain the modified pyrophyllite powder.
Preparation example 3
The modified pyrophyllite powder is prepared by the following steps:
and (3) pretreating an aminosilane coupling agent, slowly dripping water into 0.8 part of the aminosilane coupling agent, performing ultrasonic oscillation until the solution is uniform, and adding 0.1 part of absolute ethyl alcohol for dilution to obtain the surface modifier.
Pretreating pyrophyllite powder, grinding 55 parts of pyrophyllite powder with the particle size of 1000 meshes at 800r/min for 1h, adding water for wetting and uniformly mixing to obtain pasty pyrophyllite powder.
Modifying pyrophyllite powder with aminosilane coupling agent, slowly dripping surface modifier into the pasty pyrophyllite powder at 63 ℃, and continuously stirring for 90min to obtain the modified pyrophyllite powder.
Preparation example 4
Al (aluminum)2O3The modified basalt fiber is prepared by the following steps:
1) 18 parts of Al2O3Placing the mixture into water for ultrasonic dispersion for 60min, then adjusting the pH value to 5, then adding 0.5 part of aminosilane coupling agent, stirring at high speed for 3h at room temperature for modification, centrifuging, cleaning with acetone, and drying at 80 ℃.
2) Mixing 45 parts of basalt fiber, 25 parts of ethyl acetate and 8 parts of titanate coupling agent for reaction for 3min, and adding Al obtained in the step 1)2O3Stirring for 4h, filtering, washing and drying.
Preparation example 5
Al (aluminum)2O3The modified basalt fiber is prepared by the following steps:
1) 30 parts of Al2O3Placing the mixture into water for ultrasonic dispersion for 45min, then adjusting the pH value to 6, then adding 1 part of aminosilane coupling agent, stirring at high speed for 2h at room temperature for modification, centrifuging, cleaning with acetone, and drying at 60 ℃.
2) Mixing 68 parts of basalt fiber, 10 parts of ethyl acetate and 12 parts of titanate coupling agent for reaction for 3min, and adding Al obtained in the step 1)2O3Stirring for 2h, filtering, washing and drying.
Preparation example 6
Al (aluminum)2O3The modified basalt fiber is prepared by the following steps:
1) 25 parts of Al2O3Placing the mixture into water for ultrasonic dispersion for 90min, then adjusting the pH value to 6, then adding 0.8 part of aminosilane coupling agent, stirring at high speed for 3h at room temperature for modification, centrifuging, cleaning with acetone, and drying at 70 ℃.
2) Mixing 55 parts of basalt fiber, 20 parts of ethyl acetate and 10 parts of titanate coupling agent for reaction for 3min, and adding Al obtained in the step 1)2O3Stirring for 3h, filtering, washing and drying.
Example 1
The ultrahigh-strength high-performance concrete is prepared by mixing a cementing material, aggregate, an alkali activator, basalt fiber, a high-efficiency alkali water agent and water and stirring at the speed of 300r/min to prepare uniform slurry. The cementing material comprises the following components in parts by weight: slag, cement, fly ash and the modified pyrophyllite prepared in preparation example 1. The aggregate is prepared by mixing the following quartz sand with different grades in parts by weight: quartz sand A with the granularity of 50-80 meshes, quartz sand B with the granularity of 20-50 meshes and quartz sand C with the granularity of 10-20 meshes. The alkali activator is prepared by mixing (by weight) 5:1 parts of water glass solution (55%) and NaOH (purity is more than or equal to 99%). The specific amounts of the components are shown in Table 2.
TABLE 2 compounding ratio of each component in examples 1-5
Example 2
The ultrahigh-strength high-performance concrete is different from the concrete in example 1 in that the modified pyrophyllite prepared in preparation example 2 is adopted, and the dosage of each component is different, and the concrete is shown in table 2.
Example 3
The ultrahigh-strength high-performance concrete is different from the concrete in example 1 in that the modified pyrophyllite prepared in preparation example 3 is adopted, and the dosage of each component is different, and the concrete is shown in table 2.
Example 4
The ultrahigh-strength high-performance concrete is different from the concrete in example 3 in the amount of each component, and is shown in table 2.
Example 5
The ultrahigh-strength high-performance concrete is different from the concrete in example 3 in the amount of each component, and is shown in table 2.
Example 6
An ultrahigh-strength high-performance concrete was different from example 3 in that the basalt fiber was the modified basalt fiber prepared in preparation example 4.
Example 7
An ultrahigh-strength high-performance concrete was different from example 3 in that the basalt fiber was the modified basalt fiber prepared in preparation example 5.
Example 8
An ultrahigh-strength high-performance concrete was different from example 3 in that the basalt fiber was the modified basalt fiber prepared in preparation example 6.
Example 9
The ultrahigh-strength high-performance concrete is different from the concrete in example 1 in that the particle size of the pyrophyllite powder is 200 meshes.
Example 10
The ultrahigh-strength high-performance concrete is different from the concrete in example 1 in that the particle size of the pyrophyllite powder is 1200 meshes.
Example 11
The ultrahigh-strength high-performance concrete is different from the concrete in example 2 in that the quartz sand A, the quartz sand B and the quartz sand C are quartz sand with the same grading, and the granularity of the quartz sand A, the quartz sand B and the quartz sand C is 10-20 meshes.
Example 12
The ultrahigh-strength high-performance concrete is different from the concrete in example 2 in that the quartz sand A, the quartz sand B and the quartz sand C are quartz sand with the same grading, and the granularity of the quartz sand A, the quartz sand B and the quartz sand C is 20-50 meshes.
Example 13
The ultrahigh-strength high-performance concrete is different from the concrete in example 2 in that the quartz sand A, the quartz sand B and the quartz sand C are quartz sand with the same grading, and the granularity of the quartz sand A, the quartz sand B and the quartz sand C is 50-80 meshes.
Comparative example 1
An ultrahigh-strength high-performance concrete is different from the concrete in example 8 in that the same amount of cement is used to replace the modified pyrophyllite.
Comparative example 2
An ultrahigh-strength high-performance concrete is different from the concrete in example 8 in that unmodified pyrophyllite powder is added.
Comparative example 3
An ultra-high strength high performance concrete, which is different from example 3 in that the basalt fiber is replaced by the same amount of steel fiber.
Performance test
(1) And (3) detecting the compressive strength: the original compressive strength of the concrete product is tested according to GB/T50081-2002 Standard of test methods for mechanical properties of ordinary concrete.
(2) And (3) detecting the breaking strength: the flexural strength of the concrete is tested according to GB/T50081-2002 Standard of mechanical property test methods of common concrete.
(3) And (3) detecting the tensile strength: the tensile strength of the concrete is tested according to GB/T50081-2002 Standard of mechanical Properties test methods of ordinary concrete.
(4) Self-shrinkage detection: taking out a sample of 100mm x 515mm from the obtained concrete, sealing the sample by using a preservative film, and standing and curing the sample in a constant-humidity curing chamber with the temperature of 20 +/-5 ℃ and the relative humidity of 50%. And testing the length shrinkage value of the sample by adopting a CABR-NES type non-contact type shrinkage deformation instrument, and testing the length shrinkage value of the sample again after 7 days of maintenance.
TABLE 3 results of performance test of each example and comparative example
It can be seen from the combination of example 8 and comparative example 1 and table 3 that after the concrete prepared in example 8 is cured for 28 days, the compressive strength and the flexural strength of the concrete can be kept at a higher level, and the shrinkage rate of the concrete can reach a lower level, compared with the concrete prepared in comparative example 1 by using cement instead of pyrophyllite powder, the concrete has obvious improvement in shrinkage reduction performance, and the compressive strength, the flexural strength and the tensile strength of the concrete are slightly improved, and the pyrophyllite added in example 8 can improve the influence of hydration reaction on the volume of reactants, so that the shrinkage can be reduced.
By combining the detection results of example 8 and comparative example 2, it can be seen that the concrete prepared by using the pyrophyllite surface-modified by the aminosilane coupling agent DL602 has great improvement in mechanical properties and shrinkage properties. And comparing the concrete with the comparative example 1 and the comparative example 2, the fact that the folding resistance, the tensile resistance and the shrinkage reduction performance of the concrete can be enhanced by adding the pyrophyllite powder can be seen, and the modified pyrophyllite powder is used for improving the activity, the folding resistance and the tensile resistance of the concrete, so that the shrinkage performance of the concrete can be improved and the mechanical property of the concrete can be improved.
By combining the detection results of the example 3 and the comparative example 3, it can be seen that the concrete prepared by using the steel fibers instead of the basalt fibers is inferior to the concrete prepared by using the basalt fibers in terms of mechanical properties and shrinkage properties.
The results of the tests of examples 1-3 show that the amounts of the components in the ranges are higher than the compressive strength and the flexural strength of the concrete. Both the tensile strength and the shrinkage can reach a relatively good and balanced level. Meanwhile, by combining the detection results of the embodiments 3 to 5, it can be seen that reducing the ratio of the cementing material to the aggregate is an effective measure for inhibiting the concrete shrinkage, the shrinkage rate is significantly reduced, but the compressive strength of the concrete is greatly reduced, increasing the ratio of the cementing material to the aggregate can greatly improve the compressive strength of the concrete, but the shrinkage rate is greatly increased, so that the two aspects cannot be well balanced, and the shrinkage and strength factors are comprehensively considered, so that the optimal ratio is obtained when the ratio of the cementing material to the aggregate is 1: 1.
By combining the detection results of the embodiment 3 and the embodiments 6 to 8 and combining the detection results of the table 3, the problem of high shrinkage rate of the concrete can be solved by adopting the modified basalt fiber, and the compressive strength is improved to a certain extent.
Combining example 1 with examples 9-10 and table 3, it can be seen that the concrete prepared from pyrophyllite powder with too coarse or too fine particle size has poor mechanical properties and shrinkage properties. Similarly, when the results of the tests of examples 2 and 11-13 are compared, it can be seen that the concrete prepared by using the silica sand having the same composition in each of examples 11-13 is inferior in compressive strength and shrinkage.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. The ultrahigh-strength high-performance concrete is characterized by mainly comprising the following components in parts by weight:
35-60 parts of a cementing material;
28-90 parts of aggregate;
0.1-1 part of alkali activator;
5-18 parts of basalt fiber;
0.1-0.8 part of high-efficiency alkali water agent;
10-20 parts of water;
the cementing material comprises the following components in parts by weight: 5-13 parts of slag, 16-35 parts of cement, 2-9 parts of fly ash and 2-10 parts of modified pyrophyllite; the modified pyrophyllite is prepared by modifying the surface of aminosilane coupling agent and pyrophyllite powder.
2. The ultra-high strength high performance concrete according to claim 1, wherein: the modified pyrophyllite is prepared by the following steps:
pretreating an aminosilane coupling agent, adding water into 0.5-1 part of the aminosilane coupling agent, performing ultrasonic oscillation, and adding 0.1 part of absolute ethyl alcohol for dilution to obtain a surface modifier;
pre-treating pyrophyllite powder, grinding 50-60 parts of pyrophyllite powder for 1 hour at 800r/min under 500-;
and modifying the pyrophyllite powder by using an aminosilane coupling agent, slowly dripping a surface modifier into the pasty pyrophyllite powder while stirring at the temperature of 60-65 ℃, and continuously stirring for 60-90min to obtain the modified pyrophyllite powder.
3. The ultra-high strength high performance concrete according to claim 1 or 2, wherein: the basalt fiber is Al2O3The modified basalt fiber is prepared by the following steps:
1) 18-30 parts of Al2O3Placing the powder into water, performing ultrasonic dispersion for 45-90min, adjusting pH value to 5-6, adding 0.5-1 part of aminosilane coupling agent, stirring for 2-4h, centrifuging, cleaning with acetone, and drying at 60-80 deg.C to obtain Al2O3；
2) Mixing 45-68 parts of basalt fiber, 10-25 parts of ethyl acetate and 8-12 parts of titanate coupling agent, and adding Al obtained in the step 1)2O3Stirring for 2-4h, filtering, and washing.
4. The ultra-high strength high performance concrete according to claim 3, wherein: the particle size of the pyrophyllite powder is 325-1000 meshes.
5. The ultra-high strength high performance concrete according to claim 1, wherein: the weight ratio of the cementing material to the aggregate is 1: (0.8-1.5).
6. The ultra-high strength high performance concrete according to claim 1, wherein: the weight ratio of the cementing material to the aggregate is 1: 1.
7. the ultra-high strength high performance concrete according to claim 1, wherein: the aggregate is prepared by mixing the following quartz sand with different grades in parts by weight: 5-20 parts of quartz sand A, 8-31 parts of quartz sand B and 15-39 parts of quartz sand C, wherein the granularity of the quartz sand A is 50-80 meshes, the granularity of the quartz sand B is 20-50 meshes, and the granularity of the quartz sand C is 10-20 meshes.
8. The method for preparing ultra-high strength high performance concrete according to any one of claims 1 to 7, wherein: the preparation method comprises the following steps: according to the weight portion, the cementing material, the aggregate, the alkali activator, the basalt fiber, the high-efficiency alkaline water agent and the water are mixed and stirred to prepare uniform slurry.
9. The method for preparing the ultrahigh-strength high-performance concrete according to claim 8, wherein the method comprises the following steps: the stirring speed is 300-400 r/min.
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