CN111848020A - High-toughness ultrahigh-performance concrete and preparation method thereof - Google Patents
High-toughness ultrahigh-performance concrete and preparation method 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
- B28B1/525—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement containing organic fibres, e.g. wood fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/40—Mixing specially adapted for preparing mixtures containing fibres
- B28C5/402—Methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/40—Mixing specially adapted for preparing mixtures containing fibres
- B28C5/404—Pre-treatment of fibres
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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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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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
Abstract
The invention provides high-toughness ultrahigh-performance concrete and a preparation method thereof. The high-toughness ultrahigh-performance concrete comprises: and (3) cementing materials: 550-700 kg/m cement3100 to 150kg/m of silica fume3450-650 kg/m of ore powder3(ii) a Nano-filler: 130-160 kg/m limestone powder3(ii) a Fine aggregate: 400 to 500kg/m3(ii) a Modified super highMolecular Weight Polyethylene (Ultra-high Molecular Weight Polyethylene Fiber, UHMWPE) Fiber: 10 to 25kg/m3(ii) a Water reducing agent: the content of the cementing material is 0.8-1.5 wt%; the water-gel ratio of the mixture formed by the components is kept to be 0.15-0.20, and the compressive strength is not less than 100 MPa. The diameter of the modified UHMWPE fiber is 10-40 mu m, the length of the modified UHMWPE fiber is 12-20 mm, and the tensile strength of the modified UHMWPE fiber is 2000-3500 MPa. The surface of the UHMWPE fiber is modified by using the silane coupling agent, the toughness characteristic of Ultra-high Performance Concrete (UHPC) is obviously enhanced by improving the interface bonding strength between the fiber and a matrix, the width of a crack in the cracking process of the Concrete is effectively controlled, the initial cracking stress and the tensile strength of the Concrete are improved, and the effects of strain hardening, multi-crack cracking and crack refining are better realized.
Description
Technical Field
The invention relates to the technical field of building materials in civil engineering, in particular to high-toughness ultrahigh-performance concrete and a preparation method thereof.
Background
Ultra-high Performance Concrete (UHPC) is a novel Concrete material, and has the characteristics of Ultra-high compressive strength, extremely excellent durability and the like, and is gradually applied to engineering such as super high-rise buildings, large-span bridges, harbors and airports in recent years. However, as the compressive strength is continuously improved, the brittleness characteristic of concrete becomes more obvious, which not only limits the application range of the UHPC to a great extent, but also brings serious threat to the safety of the UHPC structure. Published studies have shown that the incorporation of moderate amounts of fiber is an effective way to improve the brittleness characteristics of UHPC. Wherein, the Ultra-high Molecular weight polyethylene Fiber (UHMWPE) with low density, high tensile strength and high elastic modulus has obvious effect on inhibiting the expansion and derivation of microcracks and further improving the brittleness of UHPC.
However, it is noted that the surface of the UHMWPE fiber is hydrophobic as a non-polar olefin, which results in a low interfacial bond strength with the concrete matrix, and thus the bridging crack-blocking properties of the UHMWPE fiber are not fully exploited. In order to solve the problem of low bonding strength between the UHMWPE fibers and the matrix, patent CN110776291A proposes a method for preparing high-toughness concrete by using polyethylene fibers with special-shaped cross sections, which realizes high-toughness deformation of concrete by increasing the contact area between the fibers and the concrete matrix. However, the problem of poor bonding property of a fiber-matrix interface cannot be fundamentally solved by using the profiled fibers, and in the loading process, the matrix is cracked along with the gradual increase of the load, so that the UHMWPE fibers are pulled out and become invalid quickly, and further, the toughness of the concrete cannot be effectively enhanced.
At present, various methods are used to perform modification treatment on the surface of the fiber, such as flame treatment, plasma treatment, acid treatment, and the like. Although these methods can change the roughness and polarity of the fiber surface, the operation is complicated, and the aging of the fiber is easily caused, which affects the tensile strength and service life of the fiber itself, and thus the method cannot be applied in a large scale.
Disclosure of Invention
The embodiment of the invention provides high-toughness ultrahigh-performance concrete and a preparation method thereof, which overcome the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme.
A high toughness ultra high performance concrete comprising:
and (3) cementing materials: 550-700 kg/m cement3100 to 150kg/m of silica fume3450-650 kg/m of ore powder3；
Nano-filler: 130-160 kg/m limestone powder3；
Fine aggregate: 400 to 500kg/m3；
Modified ultra-high molecular weight polyethylene (UHMWPE) fibers: 10 to 25kg/m3；
Water reducing agent: the content of the cementing material is 0.8-1.5 wt%;
the water-gel ratio of the mixture formed by the components is kept to be 0.15-0.20, and the compressive strength is not less than 100 MPa.
Preferably, the cement is silicate or early strength silicate series cement with the strength grade of 42.5 and above, and the mineral powder is mineral powder with the strength grade of S95 and above.
Preferably, the particle size of the limestone powder is 1500-2500 meshes, and the content of calcium carbonate in the limestone powder is more than or equal to 99%.
Preferably, the fine aggregate is formed by uniformly mixing quartz sand and river sand according to the weight ratio of 1:1, wherein the particle size of the quartz sand is 100-200 meshes, and the content of silicon dioxide in the quartz sand is more than or equal to 95%; the fineness modulus of the river sand is 2.4-2.9.
Preferably, the water reducing agent is any one of naphthalene-based high-efficiency water reducing agents, sulfamate-based high-efficiency water reducing agents and polycarboxylate-based high-efficiency water reducing agents.
Preferably, the diameter of the modified UHMWPE fiber is 10-40 μm, the length of the modified UHMWPE fiber is 12-20 mm, and the tensile strength of the modified UHMWPE fiber is 2000-3500 MPa.
Preferably, the specific process flow of the preparation method of the modified UHMWPE fibers comprises:
s1, pouring 10g of UHMWPE fibers into a beaker filled with 100-150 ml of distilled water, performing ultrasonic vibration for 10-20 min, and performing suction filtration to remove dust on the surfaces of the fibers to obtain a material a;
s2, immersing the material a into a silane coupling agent solution, stirring for 10-30 min, and taking out to obtain a material b;
and S3, curing the material b in an oven at the temperature of 85 ℃ for 10-15 h to obtain the modified UHMWPE fiber.
Preferably, the silane coupling agent solution is a mixed solution of a silane coupling agent and distilled water, the content of the silane coupling agent is 1-4 wt%, and the silane coupling agent is one or a combination of more of gamma-aminopropylmethyldiethoxysilane, 3-aminopropyltrimethoxysilane and 3-aminopropyltriethoxysilane.
A preparation method of high-toughness ultrahigh-performance concrete comprises the following steps:
s1, adding cement, silica fume, mineral powder, limestone powder, quartz sand and river sand, and mixing and stirring for 2-3 min to obtain a mixture A;
s2, adding a dry powder type high-efficiency water reducing agent into the mixture A, mixing and stirring for 1-3 min, then adding all mixing water, and stirring for 1-2 min to obtain a mixture B; or adding a high-efficiency water reducing agent aqueous solution which is mixed with water uniformly in advance into the mixture A, and stirring for 2-4 min to obtain a mixture B.
S3, adding the prepared modified UHMWPE fibers into the mixture B, and mixing and stirring for 3-5 min to obtain a high-toughness ultrahigh-performance concrete mixture; measuring the slump of the high-toughness ultrahigh-performance concrete mixture, and keeping the slump within the range of 180 +/-20 mm;
s4, placing the high-toughness ultrahigh-performance concrete mixture into a mold, covering a preservative film on the surface of the mold, then placing the high-toughness ultrahigh-performance concrete mixture and the mold into a standard curing room, and curing for 24-48 h;
s5, moving the high-toughness and ultra-high-performance concrete mixture and the mould out of a curing chamber, and performing demoulding treatment;
and S6, carrying out thermal curing treatment on the demolded high-toughness ultrahigh-performance concrete, taking out the concrete after curing, and naturally curing the concrete at room temperature for more than 7 days to obtain a high-toughness ultrahigh-performance concrete finished product.
The method is characterized in that the thermal curing mode is hot water curing or steam curing, the temperature is 90 +/-5 ℃, and the curing time is 2-4 d.
According to the technical scheme provided by the embodiment of the invention, the silane coupling agent is used for modifying the surface of the UHMWPE fiber, the toughness characteristic of the UHPC is obviously enhanced by improving the interface bonding strength between the fiber and the matrix, the width of a crack in the cracking process of the concrete is effectively controlled, the initial cracking stress and the tensile strength of the concrete are improved, the effects of strain hardening, multi-crack cracking and crack refining are better realized, and the application field of the UHPC is further widened.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a block diagram of a direct tensile dog bone test piece and apparatus according to an embodiment of the present invention;
FIG. 2 is a tensile stress-strain curve of a comparative example and an example provided by examples of the present invention;
FIG. 3 is a schematic diagram of crack propagation during a direct tensile test of a comparative example and an example provided by an example of the present invention, where A is a comparative example test piece and B is an example test piece.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
Aiming at the defects in the prior art, the invention provides high-toughness ultrahigh-performance concrete and a preparation method thereof, which are used for improving the problems of low interface bonding strength between UHMWPE (ultrahigh molecular weight polyethylene) fibers and a matrix, poor UHPC (ultrahigh molecular weight polyethylene) toughness, low tensile strength, easiness in cracking and the like.
The high-toughness ultrahigh-performance concrete provided by the embodiment of the invention is prepared by uniformly mixing the following components in corresponding weight ratio:
and (3) cementing materials: 550-700 kg/m cement3100 to 150kg/m of silica fume 3450-650 kg/m of ore powder3；
Nano-filler: 130-160 kg/m limestone powder3；
Fine aggregate: 400 to 500kg/m3；
Modified ultra-high molecular weight polyethylene (UHMWPE) fibers: 10 to 25kg/m3；
High-efficiency water reducing agent: the content of the cementing material is 0.8-1.5 wt%;
the water-gel ratio of the mixture formed by the components is kept to be 0.15-0.20, and the compressive strength is not less than 100 MPa.
The cement is silicate or early strength silicate series cement with the strength grade of 42.5 and above.
The mineral powder is S95 grade and above.
The particle size of the limestone powder is 1500-2500 meshes, and the content of calcium carbonate in the limestone powder is more than or equal to 99%.
The fine aggregate is formed by uniformly mixing quartz sand and river sand according to the weight ratio of 1:1, wherein the particle size of the quartz sand is 100-200 meshes, and the content of silicon dioxide in the quartz sand is more than or equal to 95%; the fineness modulus of the river sand is 2.4-2.9.
The high-efficiency water reducing agent is any one of naphthalene high-efficiency water reducing agents, sulfamate high-efficiency water reducing agents and polycarboxylate high-efficiency water reducing agents.
The diameter of the modified UHMWPE fiber is 10-40 mu m, the length of the modified UHMWPE fiber is 12-20 mm, and the tensile strength of the modified UHMWPE fiber is 2000-3500 MPa.
The specific treatment process of the preparation method of the modified UHMWPE fiber provided by the embodiment of the invention comprises the following steps:
S1, pouring 10g of UHMWPE fibers into a beaker filled with 100-150 ml of distilled water, performing ultrasonic vibration for 10-20 min, and performing suction filtration to remove dust on the surfaces of the fibers to obtain a material a;
s2, immersing the material a into a silane coupling agent solution, stirring for 10-30 min, and taking out to obtain a material b;
s3, curing the material b in an oven at 85 ℃ for 10-15 h to obtain the modified UHMWPE fiber.
Preferably, the silane coupling agent solution is a mixed solution of a silane coupling agent and distilled water, the content of the silane coupling agent is 1-4 wt%, and the silane coupling agent is one or a combination of more of gamma-aminopropylmethyldiethoxysilane, 3-aminopropyltrimethoxysilane and 3-aminopropyltriethoxysilane.
The processing flow of the preparation method of the high-toughness ultrahigh-performance concrete provided by the embodiment of the invention comprises the following steps:
s1, adding cement, silica fume, mineral powder, limestone powder, quartz sand and river sand, and mixing and stirring for 2-3 min to obtain a mixture A;
s2, adding a dry powder type high-efficiency water reducing agent into the mixture A, mixing and stirring for 1-3 min, then adding all mixing water, and stirring for 1-2 min to obtain a mixture B; or adding a high-efficiency water reducing agent aqueous solution which is mixed with water uniformly in advance into the mixture A, and stirring for 2-4 min to obtain a mixture B.
S3, adding the prepared modified UHMWPE fibers into the mixture B, and mixing and stirring for 3-5 min to obtain a high-toughness ultrahigh-performance concrete mixture; measuring the slump of the mixture so as to keep the slump within the range of 180 +/-20 mm;
s4, placing the high-toughness ultrahigh-performance concrete mixture into a mold, covering a preservative film on the surface of the mold, then placing the high-toughness ultrahigh-performance concrete mixture and the mold into a standard curing room, and curing for 24-48 h;
s5, moving the high-toughness and ultra-high-performance concrete mixture and the mould out of a curing chamber, and performing demoulding treatment;
and S6, carrying out thermal curing treatment on the demolded high-toughness ultrahigh-performance concrete, taking out the concrete after curing, and naturally curing the concrete at room temperature for more than 7 days to obtain a high-toughness ultrahigh-performance concrete finished product.
Further, the thermal curing mode in the step S6 is hot water curing or steam curing, the temperature is 90 +/-5 ℃, and the curing time is 2-4 d.
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and examples.
The comparative example is the ultra high performance concrete C0 doped with unmodified UHMWPE fibers and the example is the ultra high performance concrete KH-3 doped with modified UHMWPE fibers. The silane coupling agent used in this example was gamma-aminopropylmethyldiethoxysilane. The mix ratio of the two groups of concrete is shown in table 1.
TABLE 1 ultra high Performance concrete mix ratio (kg/m)3)
To comparatively analyze the toughness characteristics of the examples, direct tensile tests were performed on the ultra-high performance concrete of comparative example and example. The test piece is a dog bone type test piece of 330mm × 60mm × 30mm, the dimensions and the test device are shown in fig. 1, and fig. 1 is a schematic structural diagram of a direct tensile dog bone test piece and device provided by the embodiment of the invention.
Fig. 2 is a graph showing tensile stress-strain curves of comparative examples and examples, and fig. 3 is a graph showing crack propagation during a direct tensile test of the comparative examples and examples, wherein a is a comparative example piece and B is an example piece. As can be seen from the test results of FIGS. 2 and 3, the fiber modification treatment of the present invention can significantly improve the toughness and tensile strength of the ultra-high performance concrete and can be performed in a certain rangeAnd the initial crack stress of the concrete is improved. The toughness of the comparative example is developed to a certain extent under direct tensile load, but cracks are locally expanded too early in the loading process, so that the bearing capacity of the concrete is reduced rapidly, the cracks are wider and less in number, the development of a direct tensile stress-strain curve is not full, and the initial crack stress, the ultimate tensile strength, the ultimate tensile strain and the energy dissipation of unit volume of the corresponding concrete are respectively 5.20MPa, 6.11MPa, 1.28 percent and 14.8kJ/m 3. Compared with the comparative example, the toughness of the embodiment is fully developed, the phenomena of strain hardening and multi-crack cracking are very obvious, cracks are fine and dense and are uniformly distributed in a larger range, the phenomenon of crack localized expansion is not generated until the test piece is finally damaged, the direct tensile stress-strain curve of the concrete is full, all mechanical properties are obviously improved, and the initial crack stress, the ultimate tensile strength, the ultimate tensile strain and the energy dissipation of unit volume respectively reach 7.26MPa, 8.01MPa, 5.06 percent and 337.6kJ/m3The improvement is 39.6 percent, 31.1 percent, 295.3 percent and 2178.2 percent compared with the comparative example respectively.
According to the test results, the toughness and the crack propagation mode of the UHPC are obviously improved, and the tensile property and the initial crack stress are obviously improved under the fiber modification treatment measure of the invention.
In conclusion, in the embodiment of the invention, the silane coupling agent is used for modifying the surface of the UHMWPE fiber, the toughness characteristic of the UHPC is obviously enhanced by enhancing the interface bonding strength between the fiber and the matrix, the width of the crack in the cracking process of the concrete is effectively controlled, the initial cracking stress and the tensile strength of the concrete are improved, the effects of strain hardening, multi-crack cracking and crack thinning are better realized, and the application field of the UHPC is further widened.
The high-toughness ultrahigh-performance concrete and the preparation method thereof provided by the embodiment of the invention can be used for improving the problems of low interface bonding strength between UHMWPE (ultrahigh molecular weight polyethylene) fibers and a matrix, poor toughness of UHPC (ultra high performance polycarbonate), low tensile strength, easiness in cracking and the like.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A high toughness ultra high performance concrete comprising:
and (3) cementing materials: 550-700 kg/m cement3100 to 150kg/m of silica fume3450-650 kg/m of ore powder3；
Nano-filler: 130-160 kg/m limestone powder3；
Fine aggregate: 400 to 500kg/m3；
Modified UHMWPE fibers: 10 to 25kg/m3；
Water reducing agent: the content of the cementing material is 0.8-1.5 wt%;
the water-gel ratio of the mixture formed by the components is kept to be 0.15-0.20, and the compressive strength is not less than 100 MPa.
2. The high toughness ultra high performance concrete according to claim 1, wherein said cement is silicate or early strength silicate series cement with strength grade 42.5 and above, and said ore powder is ore powder with grade S95 and above.
3. The high-toughness ultrahigh-performance concrete according to claim 1, wherein the particle size of the limestone powder is 1500-2500 meshes, and the content of calcium carbonate in the limestone powder is not less than 99%.
4. The high-toughness ultrahigh-performance concrete according to claim 1, wherein the fine aggregate is prepared by uniformly mixing quartz sand and river sand according to a weight ratio of 1:1, wherein the particle size of the quartz sand is 100-200 meshes, and the content of silicon dioxide in the quartz sand is more than or equal to 95%; the fineness modulus of the river sand is 2.4-2.9.
5. The high-toughness ultrahigh-performance concrete according to claim 1, wherein said water reducing agent is any one of naphthalene-based superplasticizers, sulfamate-based superplasticizers and polycarboxylate-based superplasticizers.
6. The high-toughness ultrahigh-performance concrete according to claim 1, wherein the modified UHMWPE fibers have a diameter of 10 to 40 μm, a length of 12 to 20mm and a tensile strength of 2000 to 3500 MPa.
7. The high-toughness ultra-high performance concrete according to claim 6, wherein the specific process flow of the preparation method of the modified UHMWPE fiber comprises the following steps:
s1, pouring 10g of UHMWPE fibers into a beaker filled with 100-150 ml of distilled water, performing ultrasonic vibration for 10-20 min, and performing suction filtration to remove dust on the surfaces of the fibers to obtain a material a;
s2, immersing the material a into a silane coupling agent solution, stirring for 10-30 min, and taking out to obtain a material b;
And S3, curing the material b in an oven at the temperature of 85 ℃ for 10-15 h to obtain the modified UHMWPE fiber.
8. The high-toughness ultrahigh-performance concrete according to claim 7, wherein the silane coupling agent solution is a mixed solution of a silane coupling agent and distilled water, the content of the silane coupling agent is 1-4 wt%, and the silane coupling agent is one or a combination of gamma-aminopropylmethyldiethoxysilane, 3-aminopropyltrimethoxysilane and 3-aminopropyltriethoxysilane.
9. A method for producing a high toughness ultra high performance concrete according to any one of claims 1 to 8, comprising the steps of:
s1, adding cement, silica fume, mineral powder, limestone powder, quartz sand and river sand, and mixing and stirring for 2-3 min to obtain a mixture A;
s2, adding a dry powder type high-efficiency water reducing agent into the mixture A, mixing and stirring for 1-3 min, then adding all mixing water, and stirring for 1-2 min to obtain a mixture B; or adding a high-efficiency water reducing agent aqueous solution which is mixed with water uniformly in advance into the mixture A, and stirring for 2-4 min to obtain a mixture B.
S3, adding the prepared modified UHMWPE fibers into the mixture B, and mixing and stirring for 3-5 min to obtain a high-toughness ultrahigh-performance concrete mixture; measuring the slump of the high-toughness ultrahigh-performance concrete mixture, and keeping the slump within the range of 180 +/-20 mm;
S4, placing the high-toughness ultrahigh-performance concrete mixture into a mold, covering a preservative film on the surface of the mold, then placing the high-toughness ultrahigh-performance concrete mixture and the mold into a standard curing room, and curing for 24-48 h;
s5, moving the high-toughness and ultra-high-performance concrete mixture and the mould out of a curing chamber, and performing demoulding treatment;
and S6, carrying out thermal curing treatment on the demolded high-toughness ultrahigh-performance concrete, taking out the concrete after curing, and naturally curing the concrete at room temperature for more than 7 days to obtain a high-toughness ultrahigh-performance concrete finished product.
10. The method for preparing the high-toughness ultrahigh-performance concrete according to claim 9, wherein the thermal curing mode is hot water curing or steam curing, the temperature is 90 +/-5 ℃, and the curing time is 2-4 days.
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