CN113149567B - Ultra-high-performance fiber reinforced concrete for structure - Google Patents
Ultra-high-performance fiber reinforced concrete for structure Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A structural ultra-high performance fiber reinforced concrete belongs to the technical field of building materials and is prepared by cement, silica fume, mineral admixture, quartz sand, hybrid fiber, water and a high efficiency water reducing agent; wherein the mass ratio of each component is as follows: 1 part of cement, 0.2-0.4 part of silica fume, 0.6-1.5 parts of mineral admixture, 1-1.2 parts of quartz sand and 0.17-0.25 part of water; the mixing amount of the high-efficiency water reducing agent is 1.9-2.1%, the water-glue ratio is 0.14-0.20, and the total mixing amount of the volume of the hybrid fiber is 3-9%. The UHPFRC material adopts mineral admixture to replace 40-60% of cement dosage in the traditional UHPFRC material, and simultaneously replaces non-metallic fiber with steel fiber to form a multi-scale fiber mixed system of steel fiber and non-metallic fiber, so that the bearing capacity of an engineering structure can be improved by effectively utilizing the characteristics of each component, the dosage of cement and steel fiber can be reduced, the energy consumption and the emission of harmful gases in the environment can be reduced, the aims of energy conservation, emission reduction and environmental friendliness can be realized, and the application of the UHPFRC material in a civil engineering structure can be promoted.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to energy-saving and environment-friendly ultra-high-performance fiber reinforced concrete for a structure.
Background
Since the twentieth century, the development of the building field of China is fierce day by day, the infrastructure construction in all aspects is gradually perfected, and great influence is caused on the natural environment while convenience is brought to production and life of people. According to statistics, resources consumed by global infrastructure construction, operation and later maintenance account for 36% of global total energy consumption, and carbon dioxide emission accounts for 40%. The traditional concrete structure has high cement consumption, not only can excessively consume natural resources and improve production cost in the production process, but also can greatly increase the hydration heat and the discharge amount of greenhouse gases generated in the cement pouring process, the excessive hydration heat can cause the surface layer of the concrete structure to crack so as to influence the durability and service life of the structure, and the increase of the discharge amount of the greenhouse gases can further accelerate the global warming trend and destroy the ecological balance, thereby being contrary to the sustainable development strategy advocated by the state at the present stage.
The Ultra-high Performance Fiber Reinforced Concrete (UHPFRC) material has Ultra-high strength and excellent durability due to high compactness of a matrix, and is an ideal application material for engineering structure development tending to large span, light weight and assembly. However, related researches show that more than 95% of carbon dioxide (a main cause of global warming) released in the production process of the UHPFRC material is from steel fiber smelting forming and cement production preparation and hydration reaction, the participation degree of the hydration reaction of cement in the UHPFRC setting and hardening process is low (about 30% of cement hydration in 28-day age), most cement particles do not undergo hydration reaction and only serve as admixtures to improve the compactness of a matrix, and the filling effect of the UHPFRC material is the same as that of common mineral admixtures. The adoption of the inert mineral admixture as the fine aggregate not only reduces the production energy consumption, but also does not participate in the hydration reaction to release greenhouse gases. In addition, the dispersibility and orientation of the steel fiber in the traditional UHPFRC are difficult to ensure under the influence of the structure size, and the UHPFRC material generates higher self-internal stress and even generates more microcracks under the constraint contraction action so as to influence the structure durability. Therefore, how to optimize the mixing ratio of each raw material component of the UHPFRC without reducing the macroscopic mechanical property becomes one of the problems to be solved urgently in civil engineering application of the UHPFRC structure.
The invention discloses a patent with publication number CN110482914A, which is an ultra-high performance concrete manhole cover, in order to achieve the performances of high compressive strength, good durability and the like, the formula of the concrete comprises cement and copper-plated steel fibers, wherein the mass ratio of the cement is 19-37%, and the mass ratio of the steel fibers is 3-9%.
Disclosure of Invention
Aiming at the technical problems, the invention provides energy-saving and environment-friendly ultra-high-performance fiber reinforced concrete for a structure, and a novel UHPFRC material which can ensure the ultra-high durability, excellent mechanical property and deformability of the traditional UHPFRC material, is energy-saving and emission-reducing and is environment-friendly is prepared.
The application adopts the following specific technical scheme:
an energy-saving and environment-friendly ultrahigh-performance fiber reinforced concrete for a structure is prepared from cement, silica fume, mineral admixture, quartz sand, hybrid fiber, water and a high-efficiency water reducing agent; wherein the mass ratio of each component is as follows: 1 part of cement, 0.2-0.4 part of silica fume, 0.6-1.5 parts of mineral admixture, 1-1.2 parts of quartz sand and 0.17-0.25 part of water; the mixing amount of the high-efficiency water reducing agent is 1.9-2.1%, the water-glue ratio is 0.14-0.20, and the total mixing amount of the volume of the hybrid fiber is 3-9%.
Preferably, the mineral admixture is one or more of limestone mineral powder, ground quartz sand, fly ash, granulated blast furnace slag powder, steel slag powder and phosphorous slag powder.
Preferably, the mineral admixture has an average particle size of 2 to 10 μm.
Preferably, the hybrid fiber comprises copper-plated steel fiber and non-metallic fiber.
Preferably, the copper-plated steel fibers comprise one or more of straight steel fibers, end hook steel fibers, twisted steel fibers and profiled steel fibers.
Preferably, the non-metallic fibers comprise one or more of ultra-high molecular weight polyethylene fibers, glass fibers, aramid fibers and poly-p-phenylene benzobisoxazole fibers.
Preferably, the cement is ordinary portland cement with a strength grade of above 52.5.
Preferably, the average particle size of the silica fume is 200nm.
Preferably, the average particle size of the quartz sand is 0.2mm.
Preferably, the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing efficiency of the high-efficiency water reducing agent can reach 40%.
The invention has the beneficial effects that:
(1) The UHPFRC material for the structure in the application adopts the mineral admixture to replace 40-60% of the cement dosage in the traditional UHPFRC material, so that the cement dosage can be saved, the energy consumption and the carbon dioxide emission can be effectively reduced, and the energy conservation, emission reduction and environmental protection can be realized.
(2) The UHPFRC material is used for the energy-saving and environment-friendly structure to partially replace steel fibers with nonmetal fibers to form a multi-scale fiber hybrid system in which the steel fibers and other fibers are mixed, so that the characteristics of all components can be fully utilized to improve the bearing capacity of an engineering structure, effectively reduce the consumption of the steel fibers and reduce the energy consumption; the steel fiber has excellent mechanical property, the orientation and the dispersibility of the nonmetal fibers are good, the UHPFRC excellent mechanical property can be realized from a microscopic level to a macroscopic level, the dispersibility and the effectiveness of a fiber system are improved, and the structural bearing capacity is improved.
(3) The energy-saving and environment-friendly UHPFRC material for the structure has high tensile strength and excellent deformability; the UHPFRC material has low self-generated internal stress due to low cement consumption and low steel fiber mixing amount, and compared with the traditional steel fiber UHPFRC material which does not replace or only replaces the admixture, the material internal stress can be respectively reduced by 70 percent and 50 percent, thereby not only improving the structural bearing capacity, but also prolonging the service life of the structure.
(4) The energy-saving and environment-friendly UHPFRC material for the structure has excellent compressive strength, crack resistance and permeability resistance; the UHPFRC material matrix has compact microstructure and good impermeability, can reduce the influence of factors such as water, chloride ions, carbonization, freeze thawing, reinforcement corrosion and the like on the structure, and can improve the structural durability; compared with a prestressed concrete structure and a traditional UHPFRC structure, the novel UHPFRC structure has the advantages that the environmental impact of the UHPFRC material is small, the emission of carbon dioxide and toxic substances in the whole life cycle of the novel UHPFRC structure can be respectively reduced by 55% and 34%, and energy conservation, emission reduction and environmental friendliness are realized.
Detailed Description
The invention is further illustrated by the following specific examples. The starting materials and methods employed in the examples of the present invention are those conventionally available in the market and conventionally used in the art, unless otherwise specified.
An energy-saving and environment-friendly ultra-high performance fiber reinforced concrete for a structure is prepared by cement, silica fume, mineral admixture, quartz sand, hybrid fiber, water and a high efficiency water reducing agent; wherein the mass ratio of each component is as follows: 1 part of cement, 0.2-0.4 part of silica fume, 0.6-1.5 parts of mineral admixture, 1-1.2 parts of quartz sand and 0.17-0.25 part of water; the mixing amount of the high-efficiency water reducing agent is 1.9-2.1%, the water-glue ratio is 0.14-0.20, and the total mixing amount of the volume of the hybrid fiber is 3-9%. The cement is ordinary portland cement with the strength grade of above 52.5, the average particle size of silica fume is 200nm, and the average particle size of quartz sand is 0.2mm.
The mineral admixture is one or more than two of limestone mineral powder, ground quartz sand, fly ash, granulated blast furnace slag powder, steel slag powder and phosphorus slag powder, and the average particle size is 2-10 mu m. The mineral admixture replaces 40-60% of cement in the traditional UHPFRC material, so that the cement consumption can be saved, and the energy consumption and the carbon dioxide emission can be effectively reduced; the bulk density of the material can be improved, the mechanical property and the durability of the material can be improved, the internal porosity can be reduced, the self-contraction effect can be reduced, the viscoelasticity effect can be increased, and the internal stress of the material can be reduced.
The hybrid fiber comprises copper-plated steel fiber and nonmetal fiber, and the copper-plated steel fiber comprises one or more of straight steel fiber, end hook steel fiber, torsion steel fiber and special-shaped steel fiber; the nonmetal fibers comprise one or more of ultra-high molecular weight polyethylene fibers (PE fibers), glass fibers (GF fibers), aramid fibers (AF fibers) and poly (p-phenylene benzobisoxazole) (PBO fibers). The orientation and the dispersibility of the nonmetal fibers are good, a multi-scale fiber mixed system can be formed with the steel fibers, the excellent mechanical property of the UHPFRC can be realized from a microscopic level to a macroscopic level, and the dispersibility and the effectiveness of the fiber system are improved.
The high-efficiency water reducing agent adopts a polycarboxylic acid high-efficiency water reducing agent, the water reducing efficiency can reach 40 percent, the water reducing efficiency is higher, the working performance of the novel UHPFRC and the fluidity of a mixture can be improved, the water-gel ratio can be reduced, the internal porosity can be reduced, the compactness of a microstructure can be increased, and the excellent mechanical property and durability of the UHPFRC can be effectively ensured.
The UHPFRC material for the energy-saving and environment-friendly structure has high compressive strength, high tensile strength and excellent deformability, the compressive strength can reach 150MPa, the high tensile strength is expressed by the initial cracking strength of not less than 7.0MPa and the peak tensile strength of not less than 8.5MPa; the compressive strength under the natural curing condition can reach 150MPa, and the anti-permeability grade is far higher than P12; excellent strain hardening ability is exhibited by a peak tensile strain of not less than 0.5%; the UHPFRC material has stable mechanical property, the self-generated internal stress is low due to low cement consumption and low steel fiber mixing amount, and compared with the traditional steel fiber UHPFRC material which does not replace or only replaces the admixture, the material internal stress can be respectively reduced by 70 percent and 50 percent, and the structural bearing capacity can be effectively improved.
Also has excellent crack resistance and penetration resistance. The excellent crack resistance is shown in that the crack width of the UHPFRC structure is not more than 0.05mm when the tensile strain level exceeds 0.2 percent, and the crack width is not more than 0.1mm when the tensile strain level exceeds 4.5 percent; the UHPFRC material has compact microstructure and good durability, and can be used as a waterproof layer of an engineering structure.
Meanwhile, compared with a prestressed concrete structure and a traditional UHPFRC structure, the emission amounts of carbon dioxide and toxic substances in the whole life cycle of the UHPFRC material for the energy-saving and environment-friendly structure can be respectively reduced by 55% and 34%, and the energy-saving and environment-friendly structure is energy-saving, emission-reducing and environment-friendly.
Finally, the material can reach the designed strength by curing and forming under natural conditions without high-temperature high-pressure curing and steam curing.
Example 1
The UHPFRC material of the embodiment is prepared by cement, silica fume, two limestone admixtures, steel fiber, PE fiber, water, quartz sand and a high-efficiency water reducing agent. Wherein, the cement adopts CEM I type 52.5R-grade ordinary portland cement, and the dosage is 508.9kg/m3; the average grain diameter of the silica fume is 200nm, and the dosage is 178.0kg/m < 3 >; the two limestone powders are inert gelled materials, wherein the average particle size of the limestone powder 1 is 10 mu m, the using amount of the limestone powder is 170.2kg/m < 3 >, the average particle size of the limestone powder 2 is 2 mu m, and the using amount of the limestone powder is 379.1kg/m < 3 >; the hybrid fiber adopts straight steel fiber with the diameter of 0.2mm and the length of 10mm and PE fiber with the diameter of 0.012mm and the length of 6mm, wherein the volume doping amount of the steel fiber is 3 percent, the dosage is 235.5kg/m < 3 >, the volume doping amount of the PE fiber is 2 percent, and the dosage is 19.6kg/m < 3 >; the amount of water used was 119.6kg/m3; the average grain diameter of the quartz sand is 0.2mm, and the dosage is 525.2kg/m3; the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the using amount is 10.2kg/m < 3 >. In the UHPC of the embodiment 1, 16 percent and 36 percent of cement dosage in the UHPC of the comparative example 1 are respectively replaced by inert limestone powder 1 and inert limestone powder 2 with different particle sizes, and 40 percent of straight steel fiber dosage is replaced by PE fiber. Comparative example 1 the formulation of UHPC (conventional ultra high performance fibre reinforced concrete) is detailed in table 1.
The preparation of the examples comprises the following steps:
firstly, mixing: weighing the components according to the mixing ratio, checking the stirrer and prewetting; then adding half of the cementing material and the aggregate into a concrete mixer and stirring for 2 minutes; then adding all water, stirring for 1.5 minutes, adding all water reducing agents, and stirring for 1.5-3.5 minutes; then adding the rest mixture gradually in 2 minutes, and stirring for about 13 minutes; finally, adding steel fiber and PE fiber, and stirring for 10-12 minutes to obtain a uniform concrete mixture.
Step two, forming and vibrating: the concrete mixture was loaded into a mold and vibrated for 1 minute, and then the surface of the concrete block was smoothed.
Step three, maintenance and performance test: covering with plastic film, curing for 24 hr, demolding, and curing for 28d.
TABLE 1
The compressive strength and tensile strength of comparative example 1 and example 1 are shown in table 1, and the compressive strength and tensile strength of the novel ultra-high performance fiber reinforced concrete prepared by the formulation of the present application (a large amount of cement and a part of steel fibers are replaced by two mineral admixtures) are significantly better than those of the UHPC prepared by the conventional formulation of comparative example 1.
Example 2
The novel UHPFRC material is prepared from cement, silica fume, limestone powder, steel fibers, PBO fibers, water, quartz sand and a high-efficiency water reducing agent. Wherein, the cement adopts CEM I type 52.5R-grade ordinary portland cement, and the dosage is 508.9kg/m3; the average grain diameter of the silica fume is 200nm, and the using amount is 178.0kg/m3; the consumption of the limestone powder is 344.4kg/m3; the hybrid fiber adopts straight steel fiber with the diameter of 0.2mm and the length of 10mm and PBO fiber with the diameter of 0.04mm and the length of 4mm, wherein the volume mixing amount of the steel fiber is 3 percent, the using amount of the steel fiber is 235.5kg/m < 3 >, the volume mixing amount of the PBO fiber is 2 percent, and the using amount of the PBO fiber is 31.2kg/m < 3 >; the amount of water used was 125.1kg/m3; the average grain diameter of the quartz sand is 0.2mm, and the using amount of the quartz sand is 525.1kg/m < 3 >; the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the using amount is 10.2kg/m < 3 >. In the UHPC of the example 2, the inert limestone powder is used for replacing 40% of the cement dosage in the UHPC of the comparative example 2, and the PBO fiber is used for replacing 40% of the straight steel fiber dosage. The formulation of comparative example 2 is detailed in table 2. The preparation method (step) is the same as example 1.
TABLE 2
The compressive strength and tensile strength of comparative example 2 and example 2 are shown in table 2, and the compressive strength and tensile strength of the novel ultra-high performance fiber reinforced concrete (reduced cement and steel fiber usage and replaced by a mineral admixture) prepared by the formulation of the present application are significantly better than those of the UHPC prepared by the conventional formulation of comparative example 2.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (6)
1. The ultra-high performance fiber reinforced concrete for the structure is characterized by being prepared from cement, silica fume, limestone mineral powder, quartz sand, hybrid fibers, water and a high-efficiency water reducing agent; wherein the mass ratio of each component is as follows: 1 part of cement, 0.2-0.4 part of silica fume, 0.6-1.5 parts of limestone mineral powder, 1-1.2 parts of quartz sand and 0.17-0.25 part of water; the mixing amount of the high-efficiency water reducing agent is 1.9-2.1%, the water-glue ratio is 0.14-0.20, the total mixing amount of the volume of the hybrid fiber is 5%, the hybrid fiber comprises copper-plated steel fiber and non-metal fiber, wherein the volume mixing amount of the steel fiber is 3%, and the volume mixing amount of the non-metal fiber is 2%; the average particle size of the limestone mineral powder is 2-10 mu m; the nonmetal-based fibers comprise one or more of ultra-high molecular weight polyethylene fibers and poly-p-phenylene benzobisoxazole fibers.
2. The ultra-high performance fiber reinforced concrete for structures of claim 1, wherein said copper-plated steel fibers comprise one or more of straight steel fibers, end hook steel fibers, twisted steel fibers, and profiled steel fibers.
3. The ultra-high performance fiber reinforced concrete for structures of claim 1, wherein said cement is ordinary portland cement having a strength grade of 52.5 or more.
4. The ultra-high performance fiber reinforced concrete for structures of claim 1, wherein said silica fume has an average particle size of 200nm.
5. The ultra-high performance fiber reinforced concrete for structures of claim 1, wherein the quartz sand has an average particle size of 0.2mm.
6. The ultra-high performance fiber reinforced concrete for structures of claim 1, wherein said high efficiency water reducing agent is a polycarboxylic acid high efficiency water reducing agent with a water reducing efficiency of 40%.
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| CN114956713B (en) * | 2022-03-31 | 2022-12-09 | 昭通市宜昭高速公路投资开发有限公司 | Nonmetal fiber reinforced ultra-high performance concrete |
| CN114890746A (en) * | 2022-05-17 | 2022-08-12 | 成都城投城建科技有限公司 | Steel-STC light combined structure bridge deck pavement material, bridge deck and steam-curing-free construction process thereof |
| CN115124303A (en) * | 2022-06-20 | 2022-09-30 | 苏州三佳交通工程有限公司 | Economical ultra-high performance concrete for evacuation platform |
| CN115304311A (en) * | 2022-07-14 | 2022-11-08 | 福建三凯建筑材料有限公司 | Ultrahigh-performance concrete and preparation method thereof |
| CN115321891A (en) * | 2022-08-31 | 2022-11-11 | 河北工业大学 | Hybrid fiber toughened high-ductility geopolymer material and preparation method thereof |
| CN115650667B (en) * | 2022-10-26 | 2023-09-26 | 华新水泥股份有限公司 | Multiphase and multi-scale fiber toughened ultra-high performance concrete and preparation method thereof |
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| CN108191351A (en) * | 2018-03-08 | 2018-06-22 | 同济大学 | A kind of ultra-high performance concrete for mixing assorted fibre |
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