CN105060779A - Fiber reinforced cement based composite material for reinforcing reinforced concrete structure - Google Patents
Fiber reinforced cement based composite material for reinforcing reinforced concrete structure Download PDFInfo
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- CN105060779A CN105060779A CN201510439681.6A CN201510439681A CN105060779A CN 105060779 A CN105060779 A CN 105060779A CN 201510439681 A CN201510439681 A CN 201510439681A CN 105060779 A CN105060779 A CN 105060779A
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Abstract
The invention relates to a high-performance fiber reinforced cement based composite material for reinforcing a cracked reinforced concrete structure under severe environments, and belongs to the technical field of building materials. The composite material is formed by mixing cement, silica powder, swelling agent, water reducing agent, fine sand, fiber and water, wherein the total mass percentage of cement, silica powder, swelling agent, water reducing agent, fine sand and fiber is 77.6% to 88.0%, and the mass percentage of water is 12.0% to 22.4%. The composite material designed by the invention has higher elasticity modulus, higher tensile strength and compression strength, higher self-healing capacity and low permeability. The material is reasonable in component design, simple in construction and maintenance and convenient for large-scale application.
Description
Technical field
The present invention relates to a kind of High Performance Fiber Reinforced Cement-based Composites reinforced for the skeleton construction that ftractures under severe environment; Belong to building material technical field.
Background technology
After ordinary reinforced concrete structure cracking, for the distortion needed for balance external load, crack width will extend to macroscopical visible horizon, etching medium (as water, air, chlorion, sulfate ion etc.) is made to penetrate into skeleton construction inside by open pore, not only reduce structural bearing capacity, and reduce structure durability.Thus; for the cracking skeleton construction in the severe environment such as humidity, the temperature difference are comparatively large, ventilation is not good; the very-high performances such as not only there is such as high tensile property (tensile strength, ductility) and high pressure resistance energy (ultimate compression strength, compressive ultimate strain) must be developed, and there is the reinforcement material of low-permeability (water-permeable, ventilation property) and the surface protecting function such as self-healing capability and weak neutralisation.
Fiber reinforced cement-based composite material, because of the existence of fiber bridging action, effectively can limit cracking, and shows multiple crack growth feature after cracking, realizes the innoxious dispersion in crack, has the advantages such as high ductility and surface protection.In addition; the matrix of fiber reinforced cement-based composite material can adopt different ratio according to the actual requirements; make body material fine and close; obtain the such as comparatively very-high performance such as high tensile and compressive strength, low-permeability (water-permeable, ventilation property) and the surface protecting function such as self-healing capability and weak neutralisation.
Existing fiber reinforced cement-based composite material because the factors such as water cement ratio is larger impact and there is the weak points such as Young's modulus lower (being less than 20GPa), cause the capability and deformation ability of fiber reinforced cement-based composite material reinforced steel concrete structure improve and not obvious.And then the reinforcing of the skeleton construction that ftractures under making existing fiber reinforced cement-based composite material be difficult to severe environment; Or result of use is undesirable.
Summary of the invention
Actual demand reinforced by the skeleton construction that ftractures under the present invention is directed to severe environment, provides a kind of High Performance Fiber Reinforced Cement-based Composites reinforced for the skeleton construction that ftractures under severe environment.
A kind of fiber reinforced cement-based composite material reinforced for skeleton construction of the present invention; Described matrix material comprises following component with mass percent:
Cement 55% ~ 67%, is preferably 56% ~ 66%, more preferably 57.0% ~ 65.0%;
Silica flour 8.0% ~ 13.5%, is preferably 8.5% ~ 13.0%, more preferably 9.0% ~ 12.5%;
Swelling agent 1.7% ~ 2.4%, is preferably 2.0% ~ 2.3%, more preferably 1.9% ~ 2.2%;
Water reducer 0.8% ~ 1.0%;
Fine sand 5.5% ~ 9.0%;
Fiber 0.4% ~ 1.1%, is preferably 0.5% ~ 1.0%, more preferably 0.6% ~ 0.9%;
Water 12.0% ~ 22.4%.
A kind of fiber reinforced cement-based composite material reinforced for skeleton construction of the present invention; Described cement is the low heat cement that low heat cement is preferably that strength grade is 42.5 grades.
A kind of fiber reinforced cement-based composite material reinforced for skeleton construction of the present invention; The unformed SiO of described silica flour
2content is greater than 90%.Its median size degree is 0.1um.
A kind of fiber reinforced cement-based composite material reinforced for skeleton construction of the present invention; Described swelling agent is commercially available sulplo-aluminate class cement expansive material.As UEA, alumite plumping agent EA-L-type etc.
A kind of fiber reinforced cement-based composite material reinforced for skeleton construction of the present invention; Described water reducer is Polycarboxylic Superplasticizer or naphthalene series high-efficiency water-reducing agent.
A kind of fiber reinforced cement-based composite material reinforced for skeleton construction of the present invention; Described fine sand is the quartz sand that diameter is less than or equal to 0.5mm, is preferably the quartz sand of 0.1mm-0.5mm, the more preferably quartz sand of 0.2-0.5mm.
A kind of fiber reinforced cement-based composite material reinforced for skeleton construction of the present invention; Described fiber is polyethylene fibre and/or polyvinyl alcohol fiber.
A kind of fiber reinforced cement-based composite material reinforced for skeleton construction of the present invention; The Young's modulus of described polyethylene fibre is 25GPa ~ 40Gpa, tensile strength is 880MPa ~ 1800MPa.
A kind of fiber reinforced cement-based composite material reinforced for skeleton construction of the present invention; The mean length of described polyethylene fibre is 4mm ~ 8mm, mean diameter is 10 μm ~ 14 μm.
A kind of fiber reinforced cement-based composite material reinforced for skeleton construction of the present invention; The Young's modulus of described polyvinyl alcohol fiber is 88GPa ~ 120Gpa, tensile strength is 880MPa ~ 1800MPa.
A kind of fiber reinforced cement-based composite material reinforced for skeleton construction of the present invention; The mean length of described polyvinyl alcohol fiber is 10mm ~ 14mm, mean diameter is 37 μm ~ 41 μm.
A kind of fiber reinforced cement-based composite material reinforced for skeleton construction of the present invention; The ultimate tensile strength of this fiber reinforced cement-based composite material is more than or equal to 0.85%, be preferably 0.85% ~ 2.5%, more preferably 1.8-2.5%, and final tensile strength is more than or equal to 5.3MPa.
A kind of fiber reinforced cement-based composite material reinforced for skeleton construction of the present invention; Described matrix material 28d ultimate compression strength, at more than 70MPa, is preferably 90-100MPa, corresponding ultimate compressive strain about 0.40%.
Beneficial effect
The present invention adopts the ultra-fine silicon ash particle of fully dispersion, being filled in cement granules piles up in the space of system, realize particle packing densification, form high solidity particle packing system by high efficiency water reducing agent again, make fiber reinforced cement-based composite material have higher elasticity modulus, compared with the very-high performance such as high tensile and compressive strength, stronger self-healing capability and low-permeability.The neutralisation ability (chloride ion transport ability) of the composite finished product simultaneously designed by the present invention is significantly smaller than normal concrete, and thus the corrosion resistance nature of material is higher, and then decreases the corrosion of material internal reinforcing bar.
The polyethylene fibre that the present invention selects and/or polyvinyl alcohol fiber Young's modulus higher, obtain the cement-base composite material of superior performance by the synergy of itself and appropriate cement, silica flour, swelling agent, water reducer, fine sand, water; As gained finished product has the very-high performance such as high tensile property (tensile strength, ductility) and high pressure resistance energy (ultimate compression strength, compressive ultimate strain), also there is low-permeability (water-permeable, ventilation property) and the surface protecting function such as self-healing capability, weak neutralisation simultaneously.
The reason that gained finished product of the present invention possesses high tensile property may be:
The polyethylene fibre that the present invention selects and/or polyvinyl alcohol fiber Young's modulus higher, by the synergy of itself and appropriate cement, silica flour, swelling agent, water reducer, fine sand, water, make gained finished product in the higher ductility process of generation, fiber and matrix produce slippage but few fibre breakage, and the fracture width that produces of material is very tiny and realize innoxious dispersion.
The reason that gained finished product of the present invention possesses high pressure resistance energy may be:
Because each component collocation is reasonable, make the matrix of material very fine and close, at the bridging action of fiber, this material can obtain high compressive strength.By adjustment glue mass ratio (optimum range 0.18 to 0.30 of glue mass ratio), 28d ultimate compression strength is at more than 70MPa, and corresponding ultimate compressive strains about 0.40%.
The reason that gained finished product of the present invention possesses low-permeability and self-healing capability may be:
Because the fracture width that the matrix of material is very fine and close, material produces is very tiny and realize innoxious dispersion, the High Performance Fiber Reinforced Cement-based Composites perviousness (water-permeable, ventilation property) that the present invention relates to is starkly lower than normal concrete (lower than concrete 1/10), and the resultant at material cracks place makes fine cracks inaccessible, material has self-healing capability.
The present invention uses proper due to each component and amounts of components, the neutralisation ability of gained finished product (chloride ion transport ability) is made to be significantly smaller than normal concrete, thus the corrosion resistance nature of material is higher, and the resistance to corrosion of material internal reinforcing bar is greatly improved.
Accompanying drawing explanation
Accompanying drawing 1 is the performance schematic diagram of the fiber reinforced cement-based composite material for skeleton construction reinforcing of ftractureing;
In Fig. 1, X-coordinate is the ultimate tensile strength of material, and ordinate zou is tensile strength; No. 1 curve is the high ultimate tensile strength of superstrength fiber reinforced concrete of existing cost and the graph of a relation of tensile strength; No. 2 curves are the ultimate tensile strength of the embodiment of the present invention 1 gained finished product and the graph of a relation of tensile strength; No. 3 curves are the existing ultimate tensile strength of general fibre refinforced cement based composites and the graph of a relation of tensile strength.As can be seen from the figure: the tensile strength of the superstrength fiber reinforced concrete that existing cost is high is higher, but its ultimate tensile strength is obviously not enough, causes its range of application to be very restricted; Although existing general fibre refinforced cement based composites ultimate tensile strength is comparatively large, tensile strength wretched insufficiency, therefore also causes its range of application to be very restricted.Matrix material prepared by the present invention has excellent tension and compression intensity, hardening strain.
Embodiment
The invention provides a kind of High Performance Fiber Reinforced Cement-based Composites reinforced for the skeleton construction that ftractures under severe environment, below in conjunction with the drawings and specific embodiments, the present invention is described further.
Embodiment 1
A kind of High Performance Fiber Reinforced Cement-based Composites reinforced for the skeleton construction that ftractures under severe environment, this matrix material is mixed by cement, silica flour, swelling agent, high efficiency water reducing agent, fine sand, fiber and water, total mass per-cent wherein shared by cement, silica flour, swelling agent, high efficiency water reducing agent, fine sand and fiber is 77.6%, and it is 22.4% that water accounts for mass percent.
Cement to be strength grade the be low heat cement of 42.5 grades, silica flour is the SILICA FUME (its median size degree is 0.1um) that Elkem company of Norway produces, swelling agent is commercially available sulplo-aluminate class cement expansive material, water reducer is Polycarboxylic Superplasticizer, fine sand is the quartz sand that diameter is less than 0.5mm, and fiber is the high-strength polyethylene fiber that Toyobo, Japan produces.The mass percent that above-mentioned each component accounts for described matrix material total mass is respectively as follows: low heat cement 55.0%; Silica flour 13.5%; Swelling agent 1.7%; High efficiency water reducing agent 0.8%; Fine sand 5.5%; Fiber 1.1%.
The preparation of above-mentioned a kind of High Performance Fiber Reinforced Cement-based Composites for skeleton construction reinforcing of ftractureing under severe environment: by cement, silica flour, swelling agent, high efficiency water reducing agent, fine sand and fiber and water mix and blend, obtain product.
The test-results that the present embodiment obtains the properties of product lists in table 1.Wherein, mechanical test test block used carries out water curing in 28 days (temperature is 20 ± 2 DEG C) at standard curing room, makes a strength test thereafter on mechanics machine.In addition, adopt electrophoresis tests to measure chlorion invasion depth, the coefficient of permeability measuring method with reference to the suggestion of Japanese concrete engineering association measures coefficient of permeability, measures air transmission coefficient by Torrent air permeability test.
Table 1 embodiment 1 fiber reinforced cement-based composite material test result (28 days)
Embodiment 2
A kind of High Performance Fiber Reinforced Cement-based Composites reinforced for the skeleton construction that ftractures under severe environment, this matrix material is mixed by cement, silica flour, swelling agent, high efficiency water reducing agent, fine sand, fiber and water, total mass per-cent wherein shared by cement, silica flour, swelling agent, high efficiency water reducing agent, fine sand and fiber is 83.7%, and it is 16.3% that water accounts for mass percent.
Cement to be strength grade the be low heat cement of 42.5 grades, silica flour is the SILICA FUME that Elkem company of Norway produces, swelling agent is commercially available sulplo-aluminate class cement expansive material, water reducer is Polycarboxylic Superplasticizer, fine sand is the quartz sand that diameter is less than 0.5mm, and fiber is the high-strength polyethylene fiber that Toyobo, Japan produces.The mass percent that above-mentioned each component accounts for described matrix material total mass is respectively as follows: low heat cement 61.5%; Silica flour 11.2%; Swelling agent 1.9%; High efficiency water reducing agent 0.9%; Fine sand 7.5%; Fiber 0.7%.
The preparation of above-mentioned a kind of High Performance Fiber Reinforced Cement-based Composites for skeleton construction reinforcing of ftractureing under severe environment: by cement, silica flour, swelling agent, high efficiency water reducing agent, fine sand and fiber and water mix and blend, obtain product.
The test-results that the present embodiment obtains the properties of product lists in table 2.Wherein, mechanical test test block used carries out water curing in 28 days (temperature is 20 ± 2 DEG C) at standard curing room, makes a strength test thereafter on mechanics machine.In addition, adopt electrophoresis tests to measure chlorion invasion depth, the coefficient of permeability measuring method with reference to the suggestion of Japanese concrete engineering association measures coefficient of permeability, measures air transmission coefficient by Torrent air permeability test.
Table 2 embodiment fiber reinforced cement-based composite material test result (28 days)
Embodiment 3
A kind of High Performance Fiber Reinforced Cement-based Composites reinforced for the skeleton construction that ftractures under severe environment, this matrix material is mixed by cement, silica flour, swelling agent, high efficiency water reducing agent, fine sand, fiber and water, total mass per-cent wherein shared by cement, silica flour, swelling agent, high efficiency water reducing agent, fine sand and fiber is 87.8%, and it is 12.2% that water accounts for mass percent.
Cement to be strength grade the be low heat cement of 42.5 grades, silica flour is the SILICA FUME that Elkem company of Norway produces, swelling agent is commercially available sulplo-aluminate class cement expansive material, water reducer is Polycarboxylic Superplasticizer, fine sand is the quartz sand that diameter is less than 0.5mm, and fiber is the high-strength polyethylene fiber that Toyobo, Japan produces.The mass percent that above-mentioned each component accounts for described matrix material total mass is respectively as follows: low heat cement 67.0%; Silica flour 8.0%; Swelling agent 2.4%; High efficiency water reducing agent 1.0%; Fine sand 9.0%; Fiber 0.4%.
The preparation of above-mentioned a kind of High Performance Fiber Reinforced Cement-based Composites for skeleton construction reinforcing of ftractureing under severe environment: by cement, silica flour, swelling agent, high efficiency water reducing agent, fine sand and fiber and water mix and blend, obtain product.
The test-results that the present embodiment obtains the properties of product lists in table 1.Wherein, mechanical test test block used carries out water curing in 28 days (temperature is 20 ± 2 DEG C) at standard curing room, makes a strength test thereafter on mechanics machine.In addition, adopt electrophoresis tests to measure chlorion invasion depth, the coefficient of permeability measuring method with reference to the suggestion of Japanese concrete engineering association measures coefficient of permeability, measures air transmission coefficient by Torrent air permeability test.
Table 3 embodiment fiber reinforced cement-based composite material test result (28 days)
Claims (10)
1., for the fiber reinforced cement-based composite material that skeleton construction is reinforced, it is characterized in that; Described matrix material comprises following component with mass percent:
Cement 55% ~ 67%;
Silica flour 8.0% ~ 13.5%;
Swelling agent 1.7% ~ 2.4%;
Water reducer 0.8% ~ 1.0%;
Fine sand 5.5% ~ 9.0%;
Fiber 0.4% ~ 1.1%;
Water 12.0% ~ 22.4%.
2. a kind of fiber reinforced cement-based composite material reinforced for skeleton construction according to claim 1, is characterized in that; Described matrix material comprises following component with mass percent:
Cement 56% ~ 66%;
Silica flour 8.5% ~ 13.0%;
Swelling agent 2.0% ~ 2.3%;
Water reducer 0.8% ~ 1.0%;
Fine sand 5.5% ~ 9.0%;
Fiber 0.5% ~ 1.0%;
Water 12.0% ~ 22.4%.
3. a kind of fiber reinforced cement-based composite material reinforced for skeleton construction according to claim 1, is characterized in that; Described matrix material comprises following component with mass percent:
Cement 57.0% ~ 65.0%;
Silica flour 9.0% ~ 12.5%;
Swelling agent 1.9% ~ 2.2%;
Water reducer 0.8% ~ 1.0%;
Fine sand 5.5% ~ 9.0%;
Fiber 0.6% ~ 0.9%;
Water 12.0% ~ 22.4%.
4. a kind of fiber reinforced cement-based composite material reinforced for skeleton construction according to claim 1-3 any one, is characterized in that: described cement is low heat cement.
5. a kind of fiber reinforced cement-based composite material reinforced for skeleton construction according to claim 1-3 any one, is characterized in that: the unformed SiO of described silica flour
2mass percentage be more than or equal to 90%.
6. a kind of fiber reinforced cement-based composite material reinforced for skeleton construction according to claim 1-3 any one, is characterized in that:
Described swelling agent is sulplo-aluminate class cement expansive material;
Described water reducer is Polycarboxylic Superplasticizer or naphthalene series high-efficiency water-reducing agent;
Described fine sand is the quartz sand that diameter is less than or equal to 0.5mm.
7. a kind of fiber reinforced cement-based composite material reinforced for skeleton construction according to claim 1-3 any one, is characterized in that: described fiber is polyethylene fibre and/or polyvinyl alcohol fiber.
8. a kind of fiber reinforced cement-based composite material reinforced for skeleton construction according to claim 1-3 any one, is characterized in that:
The Young's modulus of described polyethylene fibre is 25GPa ~ 40Gpa, tensile strength is 880MPa ~ 1800MPa, and its mean length is 4mm ~ 8mm, mean diameter is 10 μm ~ 14 μm;
The Young's modulus of described polyvinyl alcohol fiber is 88GPa ~ 120Gpa, tensile strength is 880MPa ~ 1800MPa, and its mean length is 10mm ~ 14mm, mean diameter is 37 μm ~ 41 μm.
9. a kind of fiber reinforced cement-based composite material reinforced for skeleton construction according to claim 1-3 any one, it is characterized in that: the ultimate tensile strength of described fiber reinforced cement-based composite material condensation material is more than or equal to 0.85%, and final tensile strength is more than or equal to 5.3MPa.
10. a kind of fiber reinforced cement-based composite material reinforced for skeleton construction according to claim 1-3 any one, is characterized in that: described fiber reinforced cement-based composite material 28d ultimate compression strength is more than or equal to 70MPa.
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Cited By (6)
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| CN106673527A (en) * | 2017-01-03 | 2017-05-17 | 深圳大学 | Cement-based inorganic cementing material and preparation method thereof |
| CN107382187A (en) * | 2017-06-26 | 2017-11-24 | 山东建筑大学 | Reinforcement of concrete post method based on Green High Performance fiber reinforced cement-based composite material |
| CN108017355A (en) * | 2017-12-07 | 2018-05-11 | 成都东蓝星新材料有限公司 | High speed railway sound barrier anchoring cement base self-healing composite material and preparation method thereof |
| CN111423180A (en) * | 2020-04-15 | 2020-07-17 | 福州市宇心建材科技有限公司 | High-fluidity environment-friendly ultra-high-performance concrete and preparation method thereof |
| CN112210347A (en) * | 2020-10-09 | 2021-01-12 | 黑龙江省琼冰建筑设计有限公司 | High-performance composite ice material and preparation method thereof |
| CN112341099A (en) * | 2020-11-23 | 2021-02-09 | 交通运输部天津水运工程科学研究所 | High-ductility repair mortar with self-healing function and preparation method thereof |
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| CN106673527A (en) * | 2017-01-03 | 2017-05-17 | 深圳大学 | Cement-based inorganic cementing material and preparation method thereof |
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Application publication date: 20151118 Assignee: Nanjing Xuantong Construction Engineering Co., Ltd Assignor: Nanjing Forestry University Contract record no.: X2019320000152 Denomination of invention: Fiber reinforced cement based composite material for reinforcing reinforced concrete structure Granted publication date: 20170627 License type: Common License Record date: 20191022 Application publication date: 20151118 Assignee: Nanjing Yongchuang Municipal Engineering Co., Ltd Assignor: Nanjing Forestry University Contract record no.: X2019320000154 Denomination of invention: Fiber reinforced cement based composite material for reinforcing reinforced concrete structure Granted publication date: 20170627 License type: Common License Record date: 20191022 |