CN106477992A - A kind of compensation shrinks high ductility cement-base composite material - Google Patents
A kind of compensation shrinks high ductility cement-base composite material Download PDFInfo
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- CN106477992A CN106477992A CN201610893678.6A CN201610893678A CN106477992A CN 106477992 A CN106477992 A CN 106477992A CN 201610893678 A CN201610893678 A CN 201610893678A CN 106477992 A CN106477992 A CN 106477992A
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- Prior art keywords
- cement
- high ductility
- base composite
- fiber
- composite material
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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
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of compensation shrinks high ductility cement and composite it is characterised in that being mainly made up of cement, complex mineral blending material, the artificial graded sand of specified particle diameter specification, large volume volume fiber, additive and mixing water.During using the present invention, be according to actual engineering, from different fiber species, and adaptation test simultaneously is adjusted to the proportioning of material.By the way, the present invention has low-shrinkage and high ductility characteristic, can be suitably used for and the various complexity load-bearing structures in traffic engineering, such as expansion joint, wet seam, deck paving, tunnel-liner etc..
Description
Technical field
The invention belongs to concrete material technical field, shrink high ductility cement based composite wood particularly to a kind of compensation
Material, can be widely applied to bear the newly-built structure under complicated loads and special environment effect in road traffic engineering,
Can be used for reinforcing, reparation and the reconstruction and extension project of existing structure.
Background technology
Concrete material belongs to quasi-brittle material, resistance to compression not tension, leads to the actually used of field in building with traffic engineering
During, application especially in some ad hoc structure positions born under the conditions of Complicated Loads and environment are made is (as flexible
Seam, wet seam, deck paving and tunnel-liner etc.), often due to the bending tensile strength of concrete material is low, limiting strain
Low, shock resistance is not enough and the ability of adaptation alternate load effect is poor, and makes structure or part easily produce destruction, sternly
Ghost image rings use safety and the durability of structures.
At present although widely using fiber come the matrix to concrete carry out resistance split, toughness reinforcing, certain effect can be produced
Really, but it is when loading reaches first crack strength, due to the formation just split, crack can extend rapidly, material moment scatter and disappear carry
Ability, so structural damage still shows obvious fragility characteristic.
Since nineteen ninety-two, Victor professor C.Li of Univ Michigan-Ann Arbor USA is using setting that structure is combined with material
Meter theory, exploitation has formed ECC (Engineering Cementitious Composites), the change in load-bearing for this material
Shape performance especially will carried out being shown during uniaxial tensile test far above traditional concrete (or fiber concrete)
Stable strain hardening and the ability of multiple cracking cracking, largely change the quasi- fragility characteristic of concrete material.Subsequently
Scholars have carried out extensive and in-depth study to the material of this type, big with the Mr. Zhang professor of Tsing-Hua University and Zhejiang
As a example generation professor Xu learning, they also achieve plentiful and substantial achievement in research to the research neck of ECC.But due to current ECC phase
Close in achievement in research, in order to project deformability during material load-bearing, generally raw material is made with PVA the and PE fiber of import, make
The cost obtaining material is very high；And because ECC does not use coarse aggregate, fine aggregate adopts 70～140 mesh (or more high mesh number)
Mechanism quartz sand, larger quality Binder Materials mix than in the case of so that ECC hydration and hardening process drying shrinkage is larger, entering
When row reinforcing, reparation and reconstruction and extension project, adaptability is subject to a definite limitation, constrains popularization and application in engineering for this material.
The present invention is directed to traffic engineering actual demand, has prepared and a kind of can be generally applicable to each field of road traffic engineering
One of compensate and shrink high ductility cement and composite.The difference compared with the achievement in research of forefathers of this material is：1. root
According to substantial amounts of repeat to test the proportioning of material is adjusted so that the matrix of different ratio adapts to variety classes and difference is mixed
The fiber of amount.2. fine aggregate is through sieving and being adapted to so that the intensity of cement-base composite material after hydration and hardening and resisted shrinkage
Ability will be generally higher than ECC material.3. according to different kinds of fibers and volume, using one or more ore deposit being adapted therewith
Polymer blends material improves to the performance of matrix, has refined material hole body structure, has improved the interface performance of fiber and matrix, subtract
Lack the defect of structure, so that the intensity of material and durability is further improved to a certain extent.4. pass through to adopt
Extender, occurs the material that secondary reaction of hydration generation has volumetric expansion to carry out using it with the hydrated product of Binder Materials
Compensate and shrink, reduce further the drying shrinkage of cement-base composite material.
Content of the invention
Present invention improves the quasi- fragility characteristic of conventional concrete material, also excellent in its material cost and resisted shrinkage performance
A kind of in ECC material and involved in the present invention compensation has high ductility, higher while shrinking ductility cement-base composite material
Intensity and lower shrinkage characteristic, the different demand using function in traffic engineering field can be met.
In order to realize above-mentioned technical goal, the present invention is achieved through the following technical solutions：A kind of compensation shrinks height
Ductility cement-base composite material is it is characterised in that it is that people's level of specified particle diameter specification is joined by cement, complex mineral blending material
Sand, large dosage fiber, additive, and mixing water composition.Fiber is designated as 0.5～2.5% by volume fraction；Its in addition to fiber
Its component is designated as by weight：50～75 parts of cement, 40～65 parts of complex mineral blending material, 7～10.5 parts of additive, sand 40
～50 parts, 30～35 parts of water.The composition of material and proportioning can be adjusted by specific Practical Project.
A kind of compensation involved in the present invention shrinks high ductility cement-base composite material it is characterised in that have higher simultaneously
The ability of ductile fracture and relatively low contractility, its make at the standard conditions and maintenance 28d test specimen comprcssive strength energy
Reach 60～75MPa, rupture strength can reach 7～25MPa.
Cement employed in the present invention is not less than 42.5 portland cement or Portland cement for strength grade.
The present invention is modified to the performance of matrix using one or more mineral admixture, reduces large dosage ribbon
Under part, fiber and the defect of basal body interface transition region, have refined the hole body structure of material, to the intensity of material, ductility and durability
All have significant improvement.Specific mineral admixture can adopt but be not limited only to using silicon ash, flyash, Nano-meter SiO_22
And ground slag.
The present invention adopts people's graded sand of specified particle diameter specification, specifically refers to be sieved sand and strictly controls containing of sand
Mud amount and water content, sand maximum particle diameter after screening is less than 2mm, additionally needs the sand of grain groups different after screening is carried out again
Join so as to level is joined well, and the species of sand can adopt natural river sand or mechanism quartz sand.
Fiber employed in the present invention refers to metallic fiber, organic fiber and inorfil, simultaneously can also be using mixed
The form of miscellaneous fiber, for different kinds of fibers forms, will be adjusted to the proportioning of raw material by adaptation test.
Heretofore described additive refer to water reducer and, one or more of extender and antirust agent.
In order to reduce construction cost, according to specific Practical Project, a kind of compensation involved in the present invention shrinks high ductility
Cement-base composite material can carry out scene according to actual condition and mix and stir or make dry mixing material in advance.Wherein scene is mixed and stirred and is referred to water
Mud, the artificial graded sand of specific standard, complex mineral blending material, fiber, additive and mixing water are determined according to proportioning
Quality carry out scene and weigh and mixed and stirred；And refer to cement, the artificial graded sand of specific standard, grandidierite in dry mixing material
Two or more in polymer blends material, fiber and additive carry out dry mixing and form dry mixing material after weighing by proportioning, and specific
During practice of construction, then the other materials not having in packaged dry mixing material, mixing water and dry mixing material to mix is entered by proportioning
Row is weighed and is carried out site operation and mixes and stirs.
The present invention is different from other cement-base composite materials, has an advantage in that：
(1) fiber adopts metallic fiber, organic fiber and inorfil, and kinds of fibers is various.
(2) for the compensation shrinkage cement based composites under the conditions of variety classes fiber and different fibers content, by adopting
With different match ratios, to improve the property indices of hardened cement based composites.
(3) deterioration of the fiber being led to due to large dosage fiber and basal body interface transition region performance, and be distributed when fiber mixes and stirs
Uneven the led to defect within hardened cement based composites and the increase of hole, be simultaneous for variety classes fiber and
The concrete practical situation of different volumes volume, using the mineral admixture singly mixing or mixing again variety classes and proportioning, to large dosage
Under the conditions of fiber, the durability of material and internal hole body structure are further improved.
(4) so that the present invention relates to a kind of compensate shrinkage cement based composites, its intensity, anti-drying shrinkage and anti-
The ability of oozing is further enhanced, and improves proportioning except above-mentioned, singly mixes or mixes variety classes active mineral admixture again and adopt
Beyond additive, from angle of gathering materials, it is less than the sand of 2mm using maximum particle diameter, and the level of sand is joined manually fitted
Join so that its use requirement that can reach under the conditions of adapting to different conditions of mixture ratios and Practical Project.
(5) in order to reduce the contraction of hardened cement based composites further, it is allowed to and is gelled material by adding appropriate extender
There is secondary reaction of hydration in the product that material aquation produces, generate the AFt with volumetric expansion to compensate contraction, subtracted with reaching
Contracting, improve structure density and enhancing, impervious etc. purpose.
(6) due to AFt and Ca (OH)2It is unfavorable that the growth of crystal and degree of being orientated to have to the durability of hardening cement base material
Impact, and mix the degree of orientation that mineral admixture can refine and reduce crystal again, thus improving the durability of material.
Brief description
Accompanying drawing is that material of the present invention carries out curve of relationship between load and deflection during bending test with plain concrete.
Specific embodiment
In conjunction with specific embodiment, the present invention is further described, and specific embodiment is only used for the present invention is entered
Row illustrates and does not limit the invention.
Embodiment 1：The volume fraction of polyester fiber is 0.9%, and the other components in addition to fiber are designated as cement by weight
60 parts, 10 parts of silicon ash, 40 parts of flyash, 7 parts of extender, 0.4 part of water reducer, 50 parts of sand, 35 parts of water.
Embodiment 2：The volume fraction of steel fibre is 1.8%, and the other components in addition to fiber are designated as 58 parts of cement by weight,
5 parts of silicon ash, 50 parts of flyash, 8 parts of extender, 0.3 part of water reducer, 45 parts of sand, 33 parts of water.
Embodiment 3：The volume fraction of polyester fiber is 1.2%, and the other components in addition to fiber are designated as cement 58 by weight
Part, 50 parts of flyash, 8 parts of extender, 0.3 part of water reducer, 48 parts of sand, 30 parts of water.
Claims (14)
1. a kind of compensation shrinks high ductility cement-base composite material it is characterised in that described cement-base composite material is mainly
By cement, complex mineral blending material, the artificial graded sand of specified particle diameter specification, large dosage fiber, additive and mixing water
Composition；Wherein fiber is designated as 0.5～2.5% by volume fraction, and the other components in addition to fiber are designated as cement 50～75 by weight
Part, 40～65 parts of complex mineral blending material, 7～11 parts of additive, 40～50 parts of sand, 30～35 parts of water；Involved in the present invention
A kind of compensation shrinks high ductility cement-base composite material, can be mixed and stirred using scene or make in advance according to the needs of Practical Project
Dry mixing material.
2. a kind of compensation according to claim 1 shrinks high ductility cement-base composite material it is characterised in that have simultaneously
High ductility and low-shrinkage.
3. a kind of compensation according to claim 1 shrinks high ductility cement-base composite material it is characterised in that described cement
It is not less than 42.5 portland cement or Portland cement for strength grade.
4. a kind of compensation according to claim 1 shrinks high ductility cement-base composite material it is characterised in that described be combined
The main active of mineral admixture is SiOx、Al2O3、FeO、Fe2O3One or more of and free CaO.
5. a kind of compensation the according to claim 1 and 4 shrinks high ductility cement-base composite material it is characterised in that being combined
Mineral admixture can but be not limited only to using silicon ash, flyash, Nano-meter SiO_22And ground slag.
6. a kind of compensation according to claim 1 shrinks high ductility cement-base composite material it is characterised in that specified particle diameter
People's graded sand of specification refers to that the maximum particle diameter of adopted sand is less than 2mm, and level to be adjusted is equipped with and makes it sand after screening
Level is joined good.
7. a kind of compensation the according to claim 1 and 6 shrinks high ductility cement-base composite material it is characterised in that sand is
Natural river sand or mechanism quartz sand.
8. a kind of compensation according to claim 1 shrinks high ductility cement-base composite material it is characterised in that fiber refers to
Metallic fiber, inorfil and organic fiber.
9. a kind of according to claim 1 and 8 compensates and shrinks high ductility cement-base composite material it is characterised in that fiber
Can also be assorted fibre.
10. a kind of according to claim 1,8 and 9 compensates and shrinks high ductility cement-base composite material it is characterised in that fibre
Dimension refer in two or more in metallic fiber, two or more in inorfil, organic fiber two or more with
And two or more in metallic fiber, inorfil and organic fiber.
A kind of 11. compensation according to claim 1 shrink high ductility cement-base composite materials it is characterised in that fiber
Volume fraction refers to the fibrous volume of institute in cubic unit cement-base composite material, is converted into quality and carries out table during practice of construction
Show.
A kind of 12. compensation according to claim 1 shrink high ductility cement-base composite materials it is characterised in that additive
Refer to one or more of water reducer, extender and antirust agent.
A kind of 13. compensation according to claim 1 shrink high ductility cement-base composite material it is characterised in that scene is mixed
With refer to by cement, the artificial graded sand of specific standard, complex mineral blending material, fiber, additive and mixing water according to
Quality determined by proportioning carries out scene and weighs and mixed and stirred.
A kind of 14. compensation according to right 1 shrink high ductility cement-base composite material it is characterised in that dry mixing material refers to
By cement, specific standard artificial and two or more joining in sand, complex mineral blending material, fiber and additive, by joining
Ratio weighs and carries out dry mixing and forms dry mixing material, and in specific practice of construction, by packaged dry mixing material, mixing water and
Do not have the other materials mixing to be weighed by proportioning and carried out site operation in dry mixing material to mix and stir.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610893678.6A CN106477992A (en) | 2016-10-08 | 2016-10-08 | A kind of compensation shrinks high ductility cement-base composite material |
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| CN201610893678.6A CN106477992A (en) | 2016-10-08 | 2016-10-08 | A kind of compensation shrinks high ductility cement-base composite material |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108328999A (en) * | 2018-05-18 | 2018-07-27 | 济南大学 | Nano-meter SiO_2 is mixed in a kind of compensation2Shrinkage concrete and preparation method thereof |
| CN108726930A (en) * | 2018-05-28 | 2018-11-02 | 郑州大学 | A kind of engineering repair materials and preparation method thereof of lower shrinkage, high ductility |
| CN110092622A (en) * | 2019-05-05 | 2019-08-06 | 浙江大学 | A kind of green cement based composites of the high ductility of lower shrinkage |
| CN114000653A (en) * | 2021-11-03 | 2022-02-01 | 哈尔滨工业大学 | High-ductility green energy-saving anti-drop double-layer heat-insulation building structure and construction method thereof |
| CN114032724A (en) * | 2021-09-18 | 2022-02-11 | 同济大学 | Assembled recycled concrete rural pavement |
| CN115353347A (en) * | 2022-08-17 | 2022-11-18 | 中国民航大学 | Anti-shrinkage high-performance cement-based composite material and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108328999A (en) * | 2018-05-18 | 2018-07-27 | 济南大学 | Nano-meter SiO_2 is mixed in a kind of compensation2Shrinkage concrete and preparation method thereof |
| CN108726930A (en) * | 2018-05-28 | 2018-11-02 | 郑州大学 | A kind of engineering repair materials and preparation method thereof of lower shrinkage, high ductility |
| CN110092622A (en) * | 2019-05-05 | 2019-08-06 | 浙江大学 | A kind of green cement based composites of the high ductility of lower shrinkage |
| CN114032724A (en) * | 2021-09-18 | 2022-02-11 | 同济大学 | Assembled recycled concrete rural pavement |
| CN114032724B (en) * | 2021-09-18 | 2022-12-20 | 同济大学 | Assembled recycled concrete rural pavement |
| CN114000653A (en) * | 2021-11-03 | 2022-02-01 | 哈尔滨工业大学 | High-ductility green energy-saving anti-drop double-layer heat-insulation building structure and construction method thereof |
| CN115353347A (en) * | 2022-08-17 | 2022-11-18 | 中国民航大学 | Anti-shrinkage high-performance cement-based composite material and preparation method thereof |
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Application publication date: 20170308 |